Merge pull request #1100 from tonistiigi/print-outline

Build: Support for printing outline/targets of the current build

.dockerignore

@@ -1,2 +1,3 @@
 bin/
 cross-out/
+release-out/

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    open-pull-requests-limit: 10
+    directory: "/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "dependencies"
+      - "bot"

.github/workflows/build.yml

@@ -0,0 +1,214 @@
+name: build
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+
+env:
+  REPO_SLUG: "docker/buildx-bin"
+  RELEASE_OUT: "./release-out"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Test
+        uses: docker/bake-action@v2
+        with:
+          targets: test
+          set: |
+            *.cache-from=type=gha,scope=test
+            *.cache-to=type=gha,scope=test
+      -
+        name: Upload coverage
+        uses: codecov/codecov-action@v3
+        with:
+          file: ./coverage/coverage.txt
+
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.platforms.outputs.matrix }}
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Create matrix
+        id: platforms
+        run: |
+          echo ::set-output name=matrix::$(docker buildx bake binaries-cross --print | jq -cr '.target."binaries-cross".platforms')
+      -
+        name: Show matrix
+        run: |
+          echo ${{ steps.platforms.outputs.matrix }}
+
+  binaries:
+    runs-on: ubuntu-latest
+    needs:
+      - prepare
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: ${{ fromJson(needs.prepare.outputs.matrix) }}
+    steps:
+      -
+        name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Build
+        uses: docker/bake-action@v2
+        with:
+          targets: release
+          set: |
+            *.platform=${{ matrix.platform }}
+            *.cache-from=type=gha,scope=binaries-${{ env.PLATFORM_PAIR }}
+            *.cache-to=type=gha,scope=binaries-${{ env.PLATFORM_PAIR }},mode=max
+      -
+        name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: buildx
+          path: ${{ env.RELEASE_OUT }}/*
+          if-no-files-found: error
+
+  bin-image:
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name != 'pull_request' }}
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ${{ env.REPO_SLUG }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+          bake-target: meta-helper
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push image
+        uses: docker/bake-action@v2
+        with:
+          files: |
+            ./docker-bake.hcl
+            ${{ steps.meta.outputs.bake-file }}
+          targets: image-cross
+          push: ${{ github.event_name != 'pull_request' }}
+          set: |
+            *.cache-from=type=gha,scope=bin-image
+            *.cache-to=type=gha,scope=bin-image,mode=max
+
+  release:
+    runs-on: ubuntu-latest
+    needs:
+      - binaries
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Download binaries
+        uses: actions/download-artifact@v3
+        with:
+          name: buildx
+          path: ${{ env.RELEASE_OUT }}
+      -
+        name: Create checksums
+        run: ./hack/hash-files
+      -
+        name: List artifacts
+        run: |
+          tree -nh ${{ env.RELEASE_OUT }}
+      -
+        name: Check artifacts
+        run: |
+          find ${{ env.RELEASE_OUT }} -type f -exec file -e ascii -- {} +
+      -
+        name: GitHub Release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: softprops/action-gh-release@1e07f4398721186383de40550babbdf2b84acfc5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          draft: true
+          files: ${{ env.RELEASE_OUT }}/*
+
+  buildkit-edge:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+          driver-opts: image=moby/buildkit:master
+          buildkitd-flags: --debug
+      -
+        # Just run a bake target to check eveything runs fine
+        name: Build
+        uses: docker/bake-action@v2
+        with:
+          targets: binaries

.github/workflows/docs-release.yml

@@ -0,0 +1,56 @@
+name: docs-release
+
+on:
+  release:
+    types: [ released ]
+
+jobs:
+  open-pr:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout docs repo
+        uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.GHPAT_DOCS_DISPATCH }}
+          repository: docker/docker.github.io
+          ref: master
+      -
+        name: Prepare
+        run: |
+          rm -rf ./_data/buildx/*
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Build docs
+        uses: docker/bake-action@v2
+        with:
+          source: ${{ github.server_url }}/${{ github.repository }}.git#${{ github.event.release.name }}
+          targets: update-docs
+          set: |
+            *.output=/tmp/buildx-docs
+        env:
+          DOCS_FORMATS: yaml
+      -
+        name: Copy files
+        run: |
+          cp /tmp/buildx-docs/out/reference/*.yaml ./_data/buildx/
+      -
+        name: Commit changes
+        run: |
+          git add -A .
+      -
+        name: Create PR on docs repo
+        uses: peter-evans/create-pull-request@923ad837f191474af6b1721408744feb989a4c27 # v4.0.4
+        with:
+          token: ${{ secrets.GHPAT_DOCS_DISPATCH }}
+          push-to-fork: docker-tools-robot/docker.github.io
+          commit-message: "build: update buildx reference to ${{ github.event.release.name }}"
+          signoff: true
+          branch: dispatch/buildx-ref-${{ github.event.release.name }}
+          delete-branch: true
+          title: Update buildx reference to ${{ github.event.release.name }}
+          body: |
+            Update the buildx reference documentation to keep in sync with the latest release `${{ github.event.release.name }}`
+          draft: false

.github/workflows/docs-upstream.yml

@@ -0,0 +1,118 @@
+# this workflow runs the remote validate bake target from docker/docker.github.io
+# to check if yaml reference docs and markdown files used in this repo are still valid
+# https://github.com/docker/docker.github.io/blob/98c7c9535063ae4cd2cd0a31478a21d16d2f07a3/docker-bake.hcl#L34-L36
+name: docs-upstream
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+    paths:
+      - '.github/workflows/docs-upstream.yml'
+      - 'docs/**'
+  pull_request:
+    paths:
+      - '.github/workflows/docs-upstream.yml'
+      - 'docs/**'
+
+jobs:
+  docs-yaml:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Build reference YAML docs
+        uses: docker/bake-action@v2
+        with:
+          targets: update-docs
+          set: |
+            *.output=/tmp/buildx-docs
+            *.cache-from=type=gha,scope=docs-yaml
+            *.cache-to=type=gha,scope=docs-yaml,mode=max
+        env:
+          DOCS_FORMATS: yaml
+      -
+        name: Upload reference YAML docs
+        uses: actions/upload-artifact@v3
+        with:
+          name: docs-yaml
+          path: /tmp/buildx-docs/out/reference
+          retention-days: 1
+
+  validate:
+    runs-on: ubuntu-latest
+    needs:
+      - docs-yaml
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+        with:
+          repository: docker/docker.github.io
+      -
+        name: Install js-yaml
+        run: npm install js-yaml
+      -
+        # use the actual buildx ref that triggers this workflow, so we make
+        # sure pages fetched by docs repo are still valid
+        # https://github.com/docker/docker.github.io/blob/98c7c9535063ae4cd2cd0a31478a21d16d2f07a3/_config.yml#L164-L173
+        name: Set correct ref to fetch remote resources
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const fs = require('fs');
+            const yaml = require('js-yaml');
+
+            const configFile = '_config.yml'
+            const config = yaml.load(fs.readFileSync(configFile, 'utf8'));
+            for (const remote of config['fetch-remote']) {
+              if (remote['repo'] != 'https://github.com/docker/buildx') {
+                continue;
+              }
+              remote['ref'] = "${{ github.ref }}";
+            }
+
+            try {
+              fs.writeFileSync(configFile, yaml.dump(config), 'utf8')
+            } catch (err) {
+              console.error(err.message)
+              process.exit(1)
+            }
+      -
+        name: Prepare
+        run: |
+          # print docs jekyll config updated in previous step
+          yq _config.yml
+          # cleanup reference yaml docs and js-yaml module
+          rm -rf ./_data/buildx/* ./node_modules
+      -
+        name: Download built reference YAML docs
+        uses: actions/download-artifact@v3
+        with:
+          name: docs-yaml
+          path: ./_data/buildx/
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Validate
+        uses: docker/bake-action@v2
+        with:
+          targets: validate
+          set: |
+            *.cache-from=type=gha,scope=docs-upstream
+            *.cache-to=type=gha,scope=docs-upstream,mode=max

.github/workflows/e2e.yml

@@ -0,0 +1,166 @@
+name: e2e
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+  pull_request:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    env:
+      BIN_OUT: ./bin
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Build
+        uses: docker/bake-action@v2
+        with:
+          targets: binaries
+          set: |
+            *.cache-from=type=gha,scope=release
+            *.cache-from=type=gha,scope=binaries
+            *.cache-to=type=gha,scope=binaries
+      -
+        name: Rename binary
+        run: |
+          mv ${{ env.BIN_OUT }}/buildx ${{ env.BIN_OUT }}/docker-buildx
+      -
+        name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: binary
+          path: ${{ env.BIN_OUT }}
+          if-no-files-found: error
+          retention-days: 7
+
+  driver:
+    runs-on: ubuntu-20.04
+    needs:
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        driver:
+          - docker
+          - docker-container
+          - kubernetes
+          - remote
+        buildkit:
+          - moby/buildkit:buildx-stable-1
+          - moby/buildkit:master
+        buildkit-cfg:
+          - bkcfg-false
+          - bkcfg-true
+        multi-node:
+          - mnode-false
+          - mnode-true
+        platforms:
+          - linux/amd64
+          - linux/amd64,linux/arm64
+        include:
+          - driver: kubernetes
+            driver-opt: qemu.install=true
+          - driver: remote
+            endpoint: tcp://localhost:1234
+        exclude:
+          - driver: docker
+            multi-node: mnode-true
+          - driver: docker
+            buildkit-cfg: bkcfg-true
+          - driver: docker-container
+            multi-node: mnode-true
+          - driver: remote
+            multi-node: mnode-true
+          - driver: remote
+            buildkit-cfg: bkcfg-true
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        if: matrix.driver == 'docker' || matrix.driver == 'docker-container'
+      -
+        name: Install buildx
+        uses: actions/download-artifact@v3
+        with:
+          name: binary
+          path: /home/runner/.docker/cli-plugins
+      -
+        name: Fix perms and check
+        run: |
+          chmod +x /home/runner/.docker/cli-plugins/docker-buildx
+          docker buildx version
+      -
+        name: Init env vars
+        run: |
+          # BuildKit cfg
+          if [ "${{ matrix.buildkit-cfg }}" = "bkcfg-true" ]; then
+            cat > "/tmp/buildkitd.toml" <<EOL
+          [worker.oci]
+            max-parallelism = 2
+          EOL
+            echo "BUILDKIT_CFG=/tmp/buildkitd.toml" >> $GITHUB_ENV
+          fi
+          # Multi node
+          if [ "${{ matrix.multi-node }}" = "mnode-true" ]; then
+            echo "MULTI_NODE=1" >> $GITHUB_ENV
+          else
+            echo "MULTI_NODE=0" >> $GITHUB_ENV
+          fi
+      -
+        name: Install k3s
+        if: matrix.driver == 'kubernetes'
+        uses: debianmaster/actions-k3s@b9cf3f599fd118699a3c8a0d18a2f2bda6cf4ce4
+        id: k3s
+        with:
+          version: v1.21.2-k3s1
+      -
+        name: Config k3s
+        if: matrix.driver == 'kubernetes'
+        run: |
+          (set -x ; cat ${{ steps.k3s.outputs.kubeconfig }})
+      -
+        name: Check k3s nodes
+        if: matrix.driver == 'kubernetes'
+        run: |
+          kubectl get nodes
+      -
+        name: Launch remote buildkitd
+        if: matrix.driver == 'remote'
+        run: |
+          docker run -d \
+            --privileged \
+            --name=remote-buildkit \
+            -p 1234:1234 \
+            ${{ matrix.buildkit }} \
+            --addr unix:///run/buildkit/buildkitd.sock \
+            --addr tcp://0.0.0.0:1234
+      -
+        name: Test
+        run: |
+          make test-driver
+        env:
+          BUILDKIT_IMAGE: ${{ matrix.buildkit }}
+          DRIVER: ${{ matrix.driver }}
+          DRIVER_OPT: ${{ matrix.driver-opt }}
+          ENDPOINT: ${{ matrix.endpoint }}
+          PLATFORMS: ${{ matrix.platforms }}

.github/workflows/validate.yml

@@ -0,0 +1,42 @@
+name: validate
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - 'master'
+      - 'v[0-9]*'
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        target:
+          - lint
+          - validate-vendor
+          - validate-docs
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+      -
+        name: Run
+        run: |
+          make ${{ matrix.target }}

.gitignore

@@ -1,2 +1,4 @@
 bin
+coverage
 cross-out
+release-out

.golangci.yml

@@ -0,0 +1,40 @@
+run:
+  timeout: 10m
+  skip-files:
+    - ".*\\.pb\\.go$"
+
+  modules-download-mode: vendor
+
+  build-tags:
+
+linters:
+  enable:
+    - gofmt
+    - govet
+    - deadcode
+    - depguard
+    - goimports
+    - ineffassign
+    - misspell
+    - unused
+    - varcheck
+    - revive
+    - staticcheck
+    - typecheck
+    - structcheck
+  disable-all: true
+
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      # The io/ioutil package has been deprecated.
+      # https://go.dev/doc/go1.16#ioutil
+      - io/ioutil
+
+issues:
+  exclude-rules:
+    - linters:
+        - revive
+      text: "stutters"

.mailmap

@@ -1,6 +1,13 @@
 # This file lists all individuals having contributed content to the repository.
-# For how it is generated, see `hack/generate-authors`.
+# For how it is generated, see hack/dockerfiles/authors.Dockerfile.
 
+CrazyMax <github@crazymax.dev>
+CrazyMax <github@crazymax.dev> <1951866+crazy-max@users.noreply.github.com>
+CrazyMax <github@crazymax.dev> <crazy-max@users.noreply.github.com>
+Sebastiaan van Stijn <github@gone.nl>
+Sebastiaan van Stijn <github@gone.nl> <thaJeztah@users.noreply.github.com>
 Tibor Vass <tibor@docker.com>
 Tibor Vass <tibor@docker.com> <tiborvass@users.noreply.github.com>
 Tõnis Tiigi <tonistiigi@gmail.com>
+Ulysses Souza <ulyssessouza@gmail.com>
+Wang Jinglei <morlay.null@gmail.com>

.travis.yml

@@ -1,35 +0,0 @@
-dist: trusty
-sudo: required
-
-install:
-  - docker run --name buildkit --rm -d --privileged -p 1234:1234 $REPO_SLUG_ORIGIN --addr tcp://0.0.0.0:1234
-  - sudo docker cp buildkit:/usr/bin/buildctl /usr/bin/
-  - export BUILDKIT_HOST=tcp://0.0.0.0:1234
-
-env:
-  global:
-    - PLATFORMS="linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/s390x,linux/ppc64le"
-    - CROSS_PLATFORMS="${PLATFORMS},darwin/amd64,windows/amd64"
-    - PREFER_BUILDCTL="1"
-
-script:
-  - make binaries validate-all && TARGETPLATFORM="${CROSS_PLATFORMS}" ./hack/cross
-
-
-deploy:
-  - provider: script
-    script: PLATFORMS="${CROSS_PLATFORMS}" ./hack/release $TRAVIS_TAG release-out
-    on:
-      repo: docker/buildx
-      tags: true
-      condition: $TRAVIS_TAG =~ ^v[0-9]
-  - provider: releases
-    api_key:
-      secure: "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"
-    file: release-out/**/*
-    skip_cleanup: true
-    file_glob: true
-    on:
-     repo: docker/buildx
-     tags: true
-     condition: $TRAVIS_TAG =~ ^v[0-9]

AUTHORS

@@ -1,7 +1,45 @@
 # This file lists all individuals having contributed content to the repository.
-# For how it is generated, see `scripts/generate-authors.sh`.
+# For how it is generated, see hack/dockerfiles/authors.Dockerfile.
 
+Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
+Alex Couture-Beil <alex@earthly.dev>
+Andrew Haines <andrew.haines@zencargo.com>
+Andy MacKinlay <admackin@users.noreply.github.com>
+Anthony Poschen <zanven42@gmail.com>
+Artur Klauser <Artur.Klauser@computer.org>
+Batuhan Apaydın <developerguy2@gmail.com>
 Bin Du <bindu@microsoft.com>
+Brandon Philips <brandon@ifup.org>
 Brian Goff <cpuguy83@gmail.com>
+CrazyMax <github@crazymax.dev>
+dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
+Devin Bayer <dev@doubly.so>
+Djordje Lukic <djordje.lukic@docker.com>
+Dmytro Makovey <dmytro.makovey@docker.com>
+Donghui Wang <977675308@qq.com>
+faust <faustin@fala.red>
+Felipe Santos <felipecassiors@gmail.com>
+Fernando Miguel <github@FernandoMiguel.net>
+gfrancesco <gfrancesco@users.noreply.github.com>
+gracenoah <gracenoahgh@gmail.com>
+Hollow Man <hollowman@hollowman.ml>
+Ilya Dmitrichenko <errordeveloper@gmail.com>
+Jack Laxson <jackjrabbit@gmail.com>
+Jean-Yves Gastaud <jygastaud@gmail.com>
+khs1994 <khs1994@khs1994.com>
+Kotaro Adachi <k33asby@gmail.com>
+l00397676 <lujingxiao@huawei.com>
+Michal Augustyn <michal.augustyn@mail.com>
+Patrick Van Stee <patrick@vanstee.me>
+Saul Shanabrook <s.shanabrook@gmail.com>
+Sebastiaan van Stijn <github@gone.nl>
+SHIMA Tatsuya <ts1s1andn@gmail.com>
+Silvin Lubecki <silvin.lubecki@docker.com>
+Solomon Hykes <sh.github.6811@hykes.org>
+Sune Keller <absukl@almbrand.dk>
 Tibor Vass <tibor@docker.com>
 Tõnis Tiigi <tonistiigi@gmail.com>
+Ulysses Souza <ulyssessouza@gmail.com>
+Wang Jinglei <morlay.null@gmail.com>
+Xiang Dai <764524258@qq.com>
+zelahi <elahi.zuhayr@gmail.com>

Dockerfile

@@ -1,17 +1,21 @@
-# syntax=docker/dockerfile:1.1-experimental
+# syntax=docker/dockerfile:1.4
 
-ARG DOCKERD_VERSION=19.03-rc
-ARG CLI_VERSION=19.03
+ARG GO_VERSION=1.18
+ARG XX_VERSION=1.1.2
+ARG DOCKERD_VERSION=20.10.14
 
 FROM docker:$DOCKERD_VERSION AS dockerd-release
 
-# xgo is a helper for golang cross-compilation
-FROM --platform=$BUILDPLATFORM tonistiigi/xx:golang@sha256:6f7d999551dd471b58f70716754290495690efa8421e0a1fcf18eb11d0c0a537 AS xgo
+# xx is a helper for cross-compilation
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx
 
-FROM --platform=$BUILDPLATFORM golang:1.13-alpine AS gobase
-COPY --from=xgo / /
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine AS golatest
+
+FROM golatest AS gobase
+COPY --from=xx / /
 RUN apk add --no-cache file git
 ENV GOFLAGS=-mod=vendor
+ENV CGO_ENABLED=0
 WORKDIR /src
 
 FROM gobase AS buildx-version
@@ -21,56 +25,55 @@ RUN --mount=target=. \
   echo -n "${VERSION}" | tee /tmp/.version;
 
 FROM gobase AS buildx-build
-ENV CGO_ENABLED=0
+ARG LDFLAGS="-w -s"
 ARG TARGETPLATFORM
-RUN --mount=target=. --mount=target=/root/.cache,type=cache \
-  --mount=target=/go/pkg/mod,type=cache \
-  --mount=source=/tmp/.ldflags,target=/tmp/.ldflags,from=buildx-version \
-  set -x; go build -ldflags "$(cat /tmp/.ldflags)" -o /usr/bin/buildx ./cmd/buildx && \
-  file /usr/bin/buildx && file /usr/bin/buildx | egrep "statically linked|Mach-O|Windows"
+RUN --mount=type=bind,target=. \
+  --mount=type=cache,target=/root/.cache \
+  --mount=type=cache,target=/go/pkg/mod \
+  --mount=type=bind,source=/tmp/.ldflags,target=/tmp/.ldflags,from=buildx-version \
+  set -x; xx-go build -ldflags "$(cat /tmp/.ldflags) ${LDFLAGS}" -o /usr/bin/buildx ./cmd/buildx && \
+  xx-verify --static /usr/bin/buildx
 
-FROM buildx-build AS integration-tests
-COPY . .
+FROM gobase AS test
+RUN --mount=type=bind,target=. \
+  --mount=type=cache,target=/root/.cache \
+  --mount=type=cache,target=/go/pkg/mod \
+  go test -v -coverprofile=/tmp/coverage.txt -covermode=atomic ./... && \
+  go tool cover -func=/tmp/coverage.txt
 
-# FROM golang:1.12-alpine AS docker-cli-build
-# RUN apk add -U git bash coreutils gcc musl-dev
-# ENV CGO_ENABLED=0
-# ARG REPO=github.com/tiborvass/cli
-# ARG BRANCH=cli-plugin-aliases
-# ARG CLI_VERSION
-# WORKDIR /go/src/github.com/docker/cli
-# RUN git clone git://$REPO . && git checkout $BRANCH
-# RUN ./scripts/build/binary
+FROM scratch AS test-coverage
+COPY --from=test /tmp/coverage.txt /coverage.txt
 
 FROM scratch AS binaries-unix
-COPY --from=buildx-build /usr/bin/buildx /
+COPY --link --from=buildx-build /usr/bin/buildx /
 
 FROM binaries-unix AS binaries-darwin
 FROM binaries-unix AS binaries-linux
 
 FROM scratch AS binaries-windows
-COPY --from=buildx-build /usr/bin/buildx /buildx.exe
+COPY --link --from=buildx-build /usr/bin/buildx /buildx.exe
 
 FROM binaries-$TARGETOS AS binaries
 
+# Release
 FROM --platform=$BUILDPLATFORM alpine AS releaser
 WORKDIR /work
 ARG TARGETPLATFORM
 RUN --mount=from=binaries \
-  --mount=source=/tmp/.version,target=/tmp/.version,from=buildx-version \
+  --mount=type=bind,source=/tmp/.version,target=/tmp/.version,from=buildx-version \
   mkdir -p /out && cp buildx* "/out/buildx-$(cat /tmp/.version).$(echo $TARGETPLATFORM | sed 's/\//-/g')$(ls buildx* | sed -e 's/^buildx//')"
 
 FROM scratch AS release
 COPY --from=releaser /out/ /
 
-FROM alpine AS demo-env
+# Shell
+FROM docker:$DOCKERD_VERSION AS dockerd-release
+FROM alpine AS shell
 RUN apk add --no-cache iptables tmux git vim less openssh
 RUN mkdir -p /usr/local/lib/docker/cli-plugins && ln -s /usr/local/bin/buildx /usr/local/lib/docker/cli-plugins/docker-buildx
 COPY ./hack/demo-env/entrypoint.sh /usr/local/bin
 COPY ./hack/demo-env/tmux.conf /root/.tmux.conf
 COPY --from=dockerd-release /usr/local/bin /usr/local/bin
-#COPY --from=docker-cli-build /go/src/github.com/docker/cli/build/docker /usr/local/bin
-
 WORKDIR /work
 COPY ./hack/demo-env/examples .
 COPY --from=binaries / /usr/local/bin/

MAINTAINERS

@@ -150,6 +150,9 @@ made through a pull request.
 	[Org.Maintainers]
 
 		people = [
+			"akihirosuda",
+			"crazy-max",
+			"jedevc",
 			"tiborvass",
 			"tonistiigi",
 		]
@@ -176,6 +179,21 @@ made through a pull request.
 # All other sections should refer to people by their canonical key
 # in the people section.
 
+	[people.akihirosuda]
+	Name = "Akihiro Suda"
+	Email = "akihiro.suda.cz@hco.ntt.co.jp"
+	GitHub = "AkihiroSuda"
+
+	[people.crazy-max]
+	Name = "Kevin Alvarez"
+	Email = "contact@crazymax.dev"
+	GitHub = "crazy-max"
+
+	[people.jedevc]
+	Name = "Justin Chadwell"
+	Email = "me@jedevc.com"
+	GitHub = "jedevc"
+
 	[people.thajeztah]
 	Name = "Sebastiaan van Stijn"
 	Email = "github@gone.nl"

Makefile

@@ -1,31 +1,62 @@
+ifneq (, $(BUILDX_BIN))
+	export BUILDX_CMD = $(BUILDX_BIN)
+else ifneq (, $(shell docker buildx version))
+	export BUILDX_CMD = docker buildx
+else ifneq (, $(shell which buildx))
+	export BUILDX_CMD = $(which buildx)
+else
+	$(error "Buildx is required: https://github.com/docker/buildx#installing")
+endif
+
+export BIN_OUT = ./bin
+export RELEASE_OUT = ./release-out
+
 shell:
 	./hack/shell
 
 binaries:
-	./hack/binaries
+	$(BUILDX_CMD) bake binaries
 
 binaries-cross:
-	EXPORT_LOCAL=cross-out ./hack/cross
+	$(BUILDX_CMD) bake binaries-cross
 
 install: binaries
 	mkdir -p ~/.docker/cli-plugins
-	cp bin/buildx ~/.docker/cli-plugins/docker-buildx
+	install bin/buildx ~/.docker/cli-plugins/docker-buildx
+
+release:
+	./hack/release
+
+validate-all: lint test validate-vendor validate-docs
 
 lint:
-	./hack/lint
+	$(BUILDX_CMD) bake lint
 
 test:
-	./hack/test
+	$(BUILDX_CMD) bake test
 
 validate-vendor:
-	./hack/validate-vendor
+	$(BUILDX_CMD) bake validate-vendor
 
-validate-all: lint test validate-vendor
+validate-docs:
+	$(BUILDX_CMD) bake validate-docs
+
+validate-authors:
+	$(BUILDX_CMD) bake validate-authors
+
+test-driver:
+	./hack/test-driver
 
 vendor:
 	./hack/update-vendor
 
-generate-authors:
-	./hack/generate-authors
+docs:
+	./hack/update-docs
 
-.PHONY: vendor lint shell binaries install binaries-cross validate-all generate-authors
+authors:
+	$(BUILDX_CMD) bake update-authors
+
+mod-outdated:
+	$(BUILDX_CMD) bake mod-outdated
+
+.PHONY: shell binaries binaries-cross install release validate-all lint validate-vendor validate-docs validate-authors vendor docs authors

bake/compose.go

@@ -3,48 +3,39 @@ package bake
 import (
 	"fmt"
 	"os"
-	"reflect"
+	"path/filepath"
 	"strings"
 
-	"github.com/docker/cli/cli/compose/loader"
-	composetypes "github.com/docker/cli/cli/compose/types"
+	"github.com/compose-spec/compose-go/dotenv"
+	"github.com/compose-spec/compose-go/loader"
+	compose "github.com/compose-spec/compose-go/types"
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
 )
 
-func parseCompose(dt []byte) (*composetypes.Config, error) {
-	parsed, err := loader.ParseYAML([]byte(dt))
+// errComposeInvalid is returned when a compose file is invalid
+var errComposeInvalid = errors.New("invalid compose file")
+
+func ParseCompose(dt []byte, envs map[string]string) (*Config, error) {
+	cfg, err := loader.Load(compose.ConfigDetails{
+		ConfigFiles: []compose.ConfigFile{
+			{
+				Content: dt,
+			},
+		},
+		Environment: envs,
+	}, func(options *loader.Options) {
+		options.SkipNormalization = true
+		options.SkipConsistencyCheck = true
+	})
 	if err != nil {
 		return nil, err
 	}
-	return loader.Load(composetypes.ConfigDetails{
-		ConfigFiles: []composetypes.ConfigFile{
-			{
-				Config: parsed,
-			},
-		},
-		Environment: envMap(os.Environ()),
-	})
-}
-
-func envMap(env []string) map[string]string {
-	result := make(map[string]string, len(env))
-	for _, s := range env {
-		kv := strings.SplitN(s, "=", 2)
-		if len(kv) != 2 {
-			continue
-		}
-		result[kv[0]] = kv[1]
-	}
-	return result
-}
-
-func ParseCompose(dt []byte) (*Config, error) {
-	cfg, err := parseCompose(dt)
-	if err != nil {
+	if err = composeValidate(cfg); err != nil {
 		return nil, err
 	}
 
 	var c Config
-	var zeroBuildConfig composetypes.BuildConfig
 	if len(cfg.Services) > 0 {
 		c.Groups = []*Group{}
 		c.Targets = []*Target{}
@@ -52,13 +43,13 @@ func ParseCompose(dt []byte) (*Config, error) {
 		g := &Group{Name: "default"}
 
 		for _, s := range cfg.Services {
+			if s.Build == nil {
+				s.Build = &compose.BuildConfig{}
+			}
 
-			if reflect.DeepEqual(s.Build, zeroBuildConfig) {
-				// if not make sure they're setting an image or it's invalid d-c.yml
-				if s.Image == "" {
-					return nil, fmt.Errorf("compose file invalid: service %s has neither an image nor a build context specified. At least one must be provided.", s.Name)
-				}
-				continue
+			targetName := sanitizeTargetName(s.Name)
+			if err = validateTargetName(targetName); err != nil {
+				return nil, errors.Wrapf(err, "invalid service name %q", targetName)
 			}
 
 			var contextPathP *string
@@ -71,21 +62,43 @@ func ParseCompose(dt []byte) (*Config, error) {
 				dockerfilePath := s.Build.Dockerfile
 				dockerfilePathP = &dockerfilePath
 			}
-			g.Targets = append(g.Targets, s.Name)
+
+			var secrets []string
+			for _, bs := range s.Build.Secrets {
+				secret, err := composeToBuildkitSecret(bs, cfg.Secrets[bs.Source])
+				if err != nil {
+					return nil, err
+				}
+				secrets = append(secrets, secret)
+			}
+
+			g.Targets = append(g.Targets, targetName)
 			t := &Target{
-				Name:       s.Name,
+				Name:       targetName,
 				Context:    contextPathP,
 				Dockerfile: dockerfilePathP,
+				Tags:       s.Build.Tags,
 				Labels:     s.Build.Labels,
-				Args:       toMap(s.Build.Args),
-				CacheFrom:  s.Build.CacheFrom,
-				// TODO: add platforms
+				Args: flatten(s.Build.Args.Resolve(func(val string) (string, bool) {
+					if val, ok := s.Environment[val]; ok && val != nil {
+						return *val, true
+					}
+					val, ok := cfg.Environment[val]
+					return val, ok
+				})),
+				CacheFrom:   s.Build.CacheFrom,
+				CacheTo:     s.Build.CacheTo,
+				NetworkMode: &s.Build.Network,
+				Secrets:     secrets,
+			}
+			if err = t.composeExtTarget(s.Build.Extensions); err != nil {
+				return nil, err
 			}
 			if s.Build.Target != "" {
 				target := s.Build.Target
 				t.Target = &target
 			}
-			if s.Image != "" {
+			if len(t.Tags) == 0 && s.Image != "" {
 				t.Tags = []string{s.Image}
 			}
 			c.Targets = append(c.Targets, t)
@@ -97,14 +110,183 @@ func ParseCompose(dt []byte) (*Config, error) {
 	return &c, nil
 }
 
-func toMap(in composetypes.MappingWithEquals) map[string]string {
-	m := map[string]string{}
+func loadDotEnv(curenv map[string]string, workingDir string) (map[string]string, error) {
+	if curenv == nil {
+		curenv = make(map[string]string)
+	}
+
+	ef, err := filepath.Abs(filepath.Join(workingDir, ".env"))
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err = os.Stat(ef); os.IsNotExist(err) {
+		return curenv, nil
+	} else if err != nil {
+		return nil, err
+	}
+
+	dt, err := os.ReadFile(ef)
+	if err != nil {
+		return nil, err
+	}
+
+	envs, err := dotenv.UnmarshalBytes(dt)
+	if err != nil {
+		return nil, err
+	}
+
+	for k, v := range envs {
+		if _, set := curenv[k]; set {
+			continue
+		}
+		curenv[k] = v
+	}
+
+	return curenv, nil
+}
+
+func flatten(in compose.MappingWithEquals) compose.Mapping {
+	if len(in) == 0 {
+		return nil
+	}
+	out := compose.Mapping{}
 	for k, v := range in {
-		if v != nil {
-			m[k] = *v
-		} else {
-			m[k] = os.Getenv(k)
+		if v == nil {
+			continue
+		}
+		out[k] = *v
+	}
+	return out
+}
+
+// xbake Compose build extension provides fields not (yet) available in
+// Compose build specification: https://github.com/compose-spec/compose-spec/blob/master/build.md
+type xbake struct {
+	Tags          stringArray `yaml:"tags,omitempty"`
+	CacheFrom     stringArray `yaml:"cache-from,omitempty"`
+	CacheTo       stringArray `yaml:"cache-to,omitempty"`
+	Secrets       stringArray `yaml:"secret,omitempty"`
+	SSH           stringArray `yaml:"ssh,omitempty"`
+	Platforms     stringArray `yaml:"platforms,omitempty"`
+	Outputs       stringArray `yaml:"output,omitempty"`
+	Pull          *bool       `yaml:"pull,omitempty"`
+	NoCache       *bool       `yaml:"no-cache,omitempty"`
+	NoCacheFilter stringArray `yaml:"no-cache-filter,omitempty"`
+	Contexts      stringMap   `yaml:"contexts,omitempty"`
+	// don't forget to update documentation if you add a new field:
+	// docs/guides/bake/compose-file.md#extension-field-with-x-bake
+}
+
+type stringMap map[string]string
+type stringArray []string
+
+func (sa *stringArray) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var multi []string
+	err := unmarshal(&multi)
+	if err != nil {
+		var single string
+		if err := unmarshal(&single); err != nil {
+			return err
+		}
+		*sa = strings.Fields(single)
+	} else {
+		*sa = multi
+	}
+	return nil
+}
+
+// composeExtTarget converts Compose build extension x-bake to bake Target
+// https://github.com/compose-spec/compose-spec/blob/master/spec.md#extension
+func (t *Target) composeExtTarget(exts map[string]interface{}) error {
+	var xb xbake
+
+	ext, ok := exts["x-bake"]
+	if !ok || ext == nil {
+		return nil
+	}
+
+	yb, _ := yaml.Marshal(ext)
+	if err := yaml.Unmarshal(yb, &xb); err != nil {
+		return err
+	}
+
+	if len(xb.Tags) > 0 {
+		t.Tags = dedupSlice(append(t.Tags, xb.Tags...))
+	}
+	if len(xb.CacheFrom) > 0 {
+		t.CacheFrom = dedupSlice(append(t.CacheFrom, xb.CacheFrom...))
+	}
+	if len(xb.CacheTo) > 0 {
+		t.CacheTo = dedupSlice(append(t.CacheTo, xb.CacheTo...))
+	}
+	if len(xb.Secrets) > 0 {
+		t.Secrets = dedupSlice(append(t.Secrets, xb.Secrets...))
+	}
+	if len(xb.SSH) > 0 {
+		t.SSH = dedupSlice(append(t.SSH, xb.SSH...))
+	}
+	if len(xb.Platforms) > 0 {
+		t.Platforms = dedupSlice(append(t.Platforms, xb.Platforms...))
+	}
+	if len(xb.Outputs) > 0 {
+		t.Outputs = dedupSlice(append(t.Outputs, xb.Outputs...))
+	}
+	if xb.Pull != nil {
+		t.Pull = xb.Pull
+	}
+	if xb.NoCache != nil {
+		t.NoCache = xb.NoCache
+	}
+	if len(xb.NoCacheFilter) > 0 {
+		t.NoCacheFilter = dedupSlice(append(t.NoCacheFilter, xb.NoCacheFilter...))
+	}
+	if len(xb.Contexts) > 0 {
+		t.Contexts = dedupMap(t.Contexts, xb.Contexts)
+	}
+
+	return nil
+}
+
+// composeValidate validates a compose file
+func composeValidate(project *compose.Project) error {
+	for _, s := range project.Services {
+		if s.Build != nil {
+			for _, secret := range s.Build.Secrets {
+				if _, ok := project.Secrets[secret.Source]; !ok {
+					return errors.Wrap(errComposeInvalid, fmt.Sprintf("service %q refers to undefined build secret %s", sanitizeTargetName(s.Name), secret.Source))
+				}
+			}
 		}
 	}
-	return m
+	for name, secret := range project.Secrets {
+		if secret.External.External {
+			continue
+		}
+		if secret.File == "" && secret.Environment == "" {
+			return errors.Wrap(errComposeInvalid, fmt.Sprintf("secret %q must declare either `file` or `environment`", name))
+		}
+	}
+	return nil
+}
+
+// composeToBuildkitSecret converts secret from compose format to buildkit's
+// csv format.
+func composeToBuildkitSecret(inp compose.ServiceSecretConfig, psecret compose.SecretConfig) (string, error) {
+	if psecret.External.External {
+		return "", errors.Errorf("unsupported external secret %s", psecret.Name)
+	}
+
+	var bkattrs []string
+	if inp.Source != "" {
+		bkattrs = append(bkattrs, "id="+inp.Source)
+	}
+	if psecret.File != "" {
+		bkattrs = append(bkattrs, "src="+psecret.File)
+	}
+	if psecret.Environment != "" {
+		bkattrs = append(bkattrs, "env="+psecret.Environment)
+	}
+
+	return strings.Join(bkattrs, ","), nil
 }

bake/compose_test.go

@@ -1,6 +1,8 @@
 package bake
 
 import (
+	"os"
+	"path/filepath"
 	"sort"
 	"testing"
 
@@ -9,8 +11,6 @@ import (
 
 func TestParseCompose(t *testing.T) {
 	var dt = []byte(`
-version: "3"
-
 services:
   db:
     build: ./db
@@ -20,15 +20,29 @@ services:
     build:
       context: ./dir
       dockerfile: Dockerfile-alternate
+      network:
+        none
       args:
         buildno: 123
+      cache_from:
+        - type=local,src=path/to/cache
+      cache_to:
+        - type=local,dest=path/to/cache
+      secrets:
+        - token
+        - aws
+secrets:
+  token:
+    environment: ENV_TOKEN
+  aws:
+    file: /root/.aws/credentials
 `)
 
-	c, err := ParseCompose(dt)
+	c, err := ParseCompose(dt, nil)
 	require.NoError(t, err)
 
 	require.Equal(t, 1, len(c.Groups))
-	require.Equal(t, c.Groups[0].Name, "default")
+	require.Equal(t, "default", c.Groups[0].Name)
 	sort.Strings(c.Groups[0].Targets)
 	require.Equal(t, []string{"db", "webapp"}, c.Groups[0].Targets)
 
@@ -38,33 +52,37 @@ services:
 	})
 	require.Equal(t, "db", c.Targets[0].Name)
 	require.Equal(t, "./db", *c.Targets[0].Context)
+	require.Equal(t, []string{"docker.io/tonistiigi/db"}, c.Targets[0].Tags)
 
 	require.Equal(t, "webapp", c.Targets[1].Name)
 	require.Equal(t, "./dir", *c.Targets[1].Context)
 	require.Equal(t, "Dockerfile-alternate", *c.Targets[1].Dockerfile)
 	require.Equal(t, 1, len(c.Targets[1].Args))
 	require.Equal(t, "123", c.Targets[1].Args["buildno"])
+	require.Equal(t, []string{"type=local,src=path/to/cache"}, c.Targets[1].CacheFrom)
+	require.Equal(t, []string{"type=local,dest=path/to/cache"}, c.Targets[1].CacheTo)
+	require.Equal(t, "none", *c.Targets[1].NetworkMode)
+	require.Equal(t, []string{
+		"id=token,env=ENV_TOKEN",
+		"id=aws,src=/root/.aws/credentials",
+	}, c.Targets[1].Secrets)
 }
 
 func TestNoBuildOutOfTreeService(t *testing.T) {
 	var dt = []byte(`
-version: "3.7"
-
 services:
     external:
         image: "verycooldb:1337"
     webapp:
         build: ./db
 `)
-	c, err := ParseCompose(dt)
+	c, err := ParseCompose(dt, nil)
 	require.NoError(t, err)
 	require.Equal(t, 1, len(c.Groups))
 }
 
 func TestParseComposeTarget(t *testing.T) {
 	var dt = []byte(`
-version: "3.7"
-
 services:
   db:
     build:
@@ -76,7 +94,7 @@ services:
       target: webapp
 `)
 
-	c, err := ParseCompose(dt)
+	c, err := ParseCompose(dt, nil)
 	require.NoError(t, err)
 
 	require.Equal(t, 2, len(c.Targets))
@@ -91,8 +109,6 @@ services:
 
 func TestComposeBuildWithoutContext(t *testing.T) {
 	var dt = []byte(`
-version: "3.7"
-
 services:
   db:
     build:
@@ -103,33 +119,447 @@ services:
       target: webapp
 `)
 
-	c, err := ParseCompose(dt)
+	c, err := ParseCompose(dt, nil)
 	require.NoError(t, err)
 	require.Equal(t, 2, len(c.Targets))
 	sort.Slice(c.Targets, func(i, j int) bool {
 		return c.Targets[i].Name < c.Targets[j].Name
 	})
-	require.Equal(t, c.Targets[0].Name, "db")
+	require.Equal(t, "db", c.Targets[0].Name)
 	require.Equal(t, "db", *c.Targets[0].Target)
-	require.Equal(t, c.Targets[1].Name, "webapp")
+	require.Equal(t, "webapp", c.Targets[1].Name)
 	require.Equal(t, "webapp", *c.Targets[1].Target)
 }
 
-func TestBogusCompose(t *testing.T) {
+func TestBuildArgEnvCompose(t *testing.T) {
 	var dt = []byte(`
-version: "3.7"
-
+version: "3.8"
 services:
-  db:
-    labels:
-      - "foo"
-  webapp:
+  example:
+    image: example
     build:
       context: .
-      target: webapp
+      dockerfile: Dockerfile
+      args:
+        FOO:
+        BAR: $ZZZ_BAR
+        BRB: FOO
 `)
 
-	_, err := ParseCompose(dt)
-	require.Error(t, err)
-	require.Contains(t, err.Error(), "has neither an image nor a build context specified. At least one must be provided")
+	os.Setenv("FOO", "bar")
+	defer os.Unsetenv("FOO")
+	os.Setenv("BAR", "foo")
+	defer os.Unsetenv("BAR")
+	os.Setenv("ZZZ_BAR", "zzz_foo")
+	defer os.Unsetenv("ZZZ_BAR")
+
+	c, err := ParseCompose(dt, sliceToMap(os.Environ()))
+	require.NoError(t, err)
+	require.Equal(t, "bar", c.Targets[0].Args["FOO"])
+	require.Equal(t, "zzz_foo", c.Targets[0].Args["BAR"])
+	require.Equal(t, "FOO", c.Targets[0].Args["BRB"])
+}
+
+func TestInconsistentComposeFile(t *testing.T) {
+	var dt = []byte(`
+services:
+  webapp:
+    entrypoint: echo 1
+`)
+
+	_, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+}
+
+func TestAdvancedNetwork(t *testing.T) {
+	var dt = []byte(`
+services:
+  db:
+    networks:
+      - example.com
+    build:
+      context: ./db
+      target: db
+
+networks:
+  example.com:
+    name: example.com
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 10.5.0.0/24
+          ip_range: 10.5.0.0/24
+          gateway: 10.5.0.254
+`)
+
+	_, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+}
+
+func TestTags(t *testing.T) {
+	var dt = []byte(`
+services:
+  example:
+    image: example
+    build:
+      context: .
+      dockerfile: Dockerfile
+      tags:
+        - foo
+        - bar
+`)
+
+	c, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+	require.Equal(t, []string{"foo", "bar"}, c.Targets[0].Tags)
+}
+
+func TestDependsOnList(t *testing.T) {
+	var dt = []byte(`
+version: "3.8"
+
+services:
+  example-container:
+    image: example/fails:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
+    depends_on:
+      other-container:
+        condition: service_healthy
+    networks:
+      default:
+        aliases:
+          - integration-tests
+
+  other-container:
+    image: example/other:latest
+    healthcheck:
+      test: ["CMD", "echo", "success"]
+      retries: 5
+      interval: 5s
+      timeout: 10s
+      start_period: 5s
+
+networks:
+  default:
+    name: test-net
+`)
+
+	_, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+}
+
+func TestComposeExt(t *testing.T) {
+	var dt = []byte(`
+services:
+  addon:
+    image: ct-addon:bar
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+      cache_from:
+        - user/app:cache
+      cache_to:
+        - user/app:cache
+      tags:
+        - ct-addon:baz
+      args:
+        CT_ECR: foo
+        CT_TAG: bar
+      x-bake:
+        contexts:
+          alpine: docker-image://alpine:3.13
+        tags:
+          - ct-addon:foo
+          - ct-addon:alp
+        platforms:
+          - linux/amd64
+          - linux/arm64
+        cache-from:
+          - type=local,src=path/to/cache
+        cache-to:
+          - type=local,dest=path/to/cache
+        pull: true
+
+  aws:
+    image: ct-fake-aws:bar
+    build:
+      dockerfile: ./aws.Dockerfile
+      args:
+        CT_ECR: foo
+        CT_TAG: bar
+      x-bake:
+        secret:
+          - id=mysecret,src=/local/secret
+          - id=mysecret2,src=/local/secret2
+        ssh: default
+        platforms: linux/arm64
+        output: type=docker
+        no-cache: true
+`)
+
+	c, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+	require.Equal(t, 2, len(c.Targets))
+	sort.Slice(c.Targets, func(i, j int) bool {
+		return c.Targets[i].Name < c.Targets[j].Name
+	})
+	require.Equal(t, map[string]string{"CT_ECR": "foo", "CT_TAG": "bar"}, c.Targets[0].Args)
+	require.Equal(t, []string{"ct-addon:baz", "ct-addon:foo", "ct-addon:alp"}, c.Targets[0].Tags)
+	require.Equal(t, []string{"linux/amd64", "linux/arm64"}, c.Targets[0].Platforms)
+	require.Equal(t, []string{"user/app:cache", "type=local,src=path/to/cache"}, c.Targets[0].CacheFrom)
+	require.Equal(t, []string{"user/app:cache", "type=local,dest=path/to/cache"}, c.Targets[0].CacheTo)
+	require.Equal(t, newBool(true), c.Targets[0].Pull)
+	require.Equal(t, map[string]string{"alpine": "docker-image://alpine:3.13"}, c.Targets[0].Contexts)
+	require.Equal(t, []string{"ct-fake-aws:bar"}, c.Targets[1].Tags)
+	require.Equal(t, []string{"id=mysecret,src=/local/secret", "id=mysecret2,src=/local/secret2"}, c.Targets[1].Secrets)
+	require.Equal(t, []string{"default"}, c.Targets[1].SSH)
+	require.Equal(t, []string{"linux/arm64"}, c.Targets[1].Platforms)
+	require.Equal(t, []string{"type=docker"}, c.Targets[1].Outputs)
+	require.Equal(t, newBool(true), c.Targets[1].NoCache)
+}
+
+func TestComposeExtDedup(t *testing.T) {
+	var dt = []byte(`
+services:
+  webapp:
+    image: app:bar
+    build:
+      cache_from:
+        - user/app:cache
+      cache_to:
+        - user/app:cache
+      tags:
+        - ct-addon:foo
+      x-bake:
+        tags:
+          - ct-addon:foo
+          - ct-addon:baz
+        cache-from:
+          - user/app:cache
+          - type=local,src=path/to/cache
+        cache-to:
+          - type=local,dest=path/to/cache
+`)
+
+	c, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, []string{"ct-addon:foo", "ct-addon:baz"}, c.Targets[0].Tags)
+	require.Equal(t, []string{"user/app:cache", "type=local,src=path/to/cache"}, c.Targets[0].CacheFrom)
+	require.Equal(t, []string{"user/app:cache", "type=local,dest=path/to/cache"}, c.Targets[0].CacheTo)
+}
+
+func TestEnv(t *testing.T) {
+	envf, err := os.CreateTemp("", "env")
+	require.NoError(t, err)
+	defer os.Remove(envf.Name())
+
+	_, err = envf.WriteString("FOO=bsdf -csdf\n")
+	require.NoError(t, err)
+
+	var dt = []byte(`
+services:
+  scratch:
+    build:
+     context: .
+     args:
+        CT_ECR: foo
+        FOO:
+        NODE_ENV:
+    environment:
+      - NODE_ENV=test
+      - AWS_ACCESS_KEY_ID=dummy
+      - AWS_SECRET_ACCESS_KEY=dummy
+    env_file:
+      - ` + envf.Name() + `
+`)
+
+	c, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+	require.Equal(t, map[string]string{"CT_ECR": "foo", "FOO": "bsdf -csdf", "NODE_ENV": "test"}, c.Targets[0].Args)
+}
+
+func TestDotEnv(t *testing.T) {
+	tmpdir := t.TempDir()
+
+	err := os.WriteFile(filepath.Join(tmpdir, ".env"), []byte("FOO=bar"), 0644)
+	require.NoError(t, err)
+
+	var dt = []byte(`
+services:
+  scratch:
+    build:
+     context: .
+     args:
+        FOO:
+`)
+
+	chdir(t, tmpdir)
+	c, _, err := ParseComposeFile(dt, "docker-compose.yml")
+	require.NoError(t, err)
+	require.Equal(t, map[string]string{"FOO": "bar"}, c.Targets[0].Args)
+}
+
+func TestPorts(t *testing.T) {
+	var dt = []byte(`
+services:
+  foo:
+    build:
+     context: .
+    ports:
+      - 3306:3306
+  bar:
+    build:
+     context: .
+    ports:
+      - mode: ingress
+        target: 3306
+        published: "3306"
+        protocol: tcp
+`)
+	_, err := ParseCompose(dt, nil)
+	require.NoError(t, err)
+}
+
+func newBool(val bool) *bool {
+	b := val
+	return &b
+}
+
+func TestServiceName(t *testing.T) {
+	cases := []struct {
+		svc     string
+		wantErr bool
+	}{
+		{
+			svc:     "a",
+			wantErr: false,
+		},
+		{
+			svc:     "abc",
+			wantErr: false,
+		},
+		{
+			svc:     "a.b",
+			wantErr: false,
+		},
+		{
+			svc:     "_a",
+			wantErr: false,
+		},
+		{
+			svc:     "a_b",
+			wantErr: false,
+		},
+		{
+			svc:     "AbC",
+			wantErr: false,
+		},
+		{
+			svc:     "AbC-0123",
+			wantErr: false,
+		},
+	}
+	for _, tt := range cases {
+		tt := tt
+		t.Run(tt.svc, func(t *testing.T) {
+			_, err := ParseCompose([]byte(`
+services:
+  `+tt.svc+`:
+    build:
+      context: .
+`), nil)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestValidateComposeSecret(t *testing.T) {
+	cases := []struct {
+		name    string
+		dt      []byte
+		wantErr bool
+	}{
+		{
+			name: "secret set by file",
+			dt: []byte(`
+secrets:
+  foo:
+    file: .secret
+`),
+			wantErr: false,
+		},
+		{
+			name: "secret set by environment",
+			dt: []byte(`
+secrets:
+  foo:
+    environment: TOKEN
+`),
+			wantErr: false,
+		},
+		{
+			name: "external secret",
+			dt: []byte(`
+secrets:
+  foo:
+    external: true
+`),
+			wantErr: false,
+		},
+		{
+			name: "unset secret",
+			dt: []byte(`
+secrets:
+  foo: {}
+`),
+			wantErr: true,
+		},
+		{
+			name: "undefined secret",
+			dt: []byte(`
+services:
+  foo:
+    build:
+      secrets:
+        - token
+`),
+			wantErr: true,
+		},
+	}
+	for _, tt := range cases {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := ParseCompose(tt.dt, nil)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
+// chdir changes the current working directory to the named directory,
+// and then restore the original working directory at the end of the test.
+func chdir(t *testing.T, dir string) {
+	olddir, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("chdir: %v", err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		t.Fatalf("chdir %s: %v", dir, err)
+	}
+	t.Cleanup(func() {
+		if err := os.Chdir(olddir); err != nil {
+			t.Errorf("chdir to original working directory %s: %v", olddir, err)
+			os.Exit(1)
+		}
+	})
 }

bake/hcl.go

@@ -1,133 +1,78 @@
 package bake
 
 import (
-	"os"
 	"strings"
 
-	hcl "github.com/hashicorp/hcl/v2"
-	"github.com/hashicorp/hcl/v2/ext/userfunc"
-	"github.com/hashicorp/hcl/v2/hclsimple"
-	"github.com/hashicorp/hcl/v2/hclsyntax"
-	"github.com/zclconf/go-cty/cty"
-	"github.com/zclconf/go-cty/cty/function"
-	"github.com/zclconf/go-cty/cty/function/stdlib"
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/hclparse"
+	"github.com/moby/buildkit/solver/errdefs"
+	"github.com/moby/buildkit/solver/pb"
 )
 
-// Collection of generally useful functions in cty-using applications, which
-// HCL supports. These functions are available for use in HCL files.
-var (
-	stdlibFunctions = map[string]function.Function{
-		"absolute":               stdlib.AbsoluteFunc,
-		"add":                    stdlib.AddFunc,
-		"and":                    stdlib.AndFunc,
-		"byteslen":               stdlib.BytesLenFunc,
-		"bytesslice":             stdlib.BytesSliceFunc,
-		"csvdecode":              stdlib.CSVDecodeFunc,
-		"coalesce":               stdlib.CoalesceFunc,
-		"concat":                 stdlib.ConcatFunc,
-		"divide":                 stdlib.DivideFunc,
-		"equal":                  stdlib.EqualFunc,
-		"formatdate":             stdlib.FormatDateFunc,
-		"format":                 stdlib.FormatFunc,
-		"formatlist":             stdlib.FormatListFunc,
-		"greaterthan":            stdlib.GreaterThanFunc,
-		"greaterthanorequalto":   stdlib.GreaterThanOrEqualToFunc,
-		"hasindex":               stdlib.HasIndexFunc,
-		"index":                  stdlib.IndexFunc,
-		"int":                    stdlib.IntFunc,
-		"jsondecode":             stdlib.JSONDecodeFunc,
-		"jsonencode":             stdlib.JSONEncodeFunc,
-		"length":                 stdlib.LengthFunc,
-		"lessthan":               stdlib.LessThanFunc,
-		"lessthanorequalto":      stdlib.LessThanOrEqualToFunc,
-		"lower":                  stdlib.LowerFunc,
-		"max":                    stdlib.MaxFunc,
-		"min":                    stdlib.MinFunc,
-		"modulo":                 stdlib.ModuloFunc,
-		"multiply":               stdlib.MultiplyFunc,
-		"negate":                 stdlib.NegateFunc,
-		"notequal":               stdlib.NotEqualFunc,
-		"not":                    stdlib.NotFunc,
-		"or":                     stdlib.OrFunc,
-		"range":                  stdlib.RangeFunc,
-		"regexall":               stdlib.RegexAllFunc,
-		"regex":                  stdlib.RegexFunc,
-		"reverse":                stdlib.ReverseFunc,
-		"sethaselement":          stdlib.SetHasElementFunc,
-		"setintersection":        stdlib.SetIntersectionFunc,
-		"setsubtract":            stdlib.SetSubtractFunc,
-		"setsymmetricdifference": stdlib.SetSymmetricDifferenceFunc,
-		"setunion":               stdlib.SetUnionFunc,
-		"strlen":                 stdlib.StrlenFunc,
-		"substr":                 stdlib.SubstrFunc,
-		"subtract":               stdlib.SubtractFunc,
-		"upper":                  stdlib.UpperFunc,
+func ParseHCLFile(dt []byte, fn string) (*hcl.File, bool, error) {
+	var err error
+	if strings.HasSuffix(fn, ".json") {
+		f, diags := hclparse.NewParser().ParseJSON(dt, fn)
+		if diags.HasErrors() {
+			err = diags
+		}
+		return f, true, err
 	}
-)
-
-// Used in the first pass of decoding instead of the Config struct to disallow
-// interpolation while parsing variable blocks.
-type staticConfig struct {
-	Variables []*Variable `hcl:"variable,block"`
-	Remain    hcl.Body    `hcl:",remain"`
+	if strings.HasSuffix(fn, ".hcl") {
+		f, diags := hclparse.NewParser().ParseHCL(dt, fn)
+		if diags.HasErrors() {
+			err = diags
+		}
+		return f, true, err
+	}
+	f, diags := hclparse.NewParser().ParseHCL(dt, fn+".hcl")
+	if diags.HasErrors() {
+		f, diags2 := hclparse.NewParser().ParseJSON(dt, fn+".json")
+		if !diags2.HasErrors() {
+			return f, true, nil
+		}
+		return nil, false, diags
+	}
+	return f, true, nil
 }
 
-func ParseHCL(dt []byte, fn string) (*Config, error) {
-	// Decode user defined functions.
-	file, diags := hclsyntax.ParseConfig(dt, fn, hcl.Pos{Line: 1, Column: 1})
-	if diags.HasErrors() {
-		return nil, diags
+func formatHCLError(err error, files []File) error {
+	if err == nil {
+		return nil
 	}
-
-	userFunctions, _, diags := userfunc.DecodeUserFunctions(file.Body, "function", func() *hcl.EvalContext {
-		return &hcl.EvalContext{
-			Functions: stdlibFunctions,
+	diags, ok := err.(hcl.Diagnostics)
+	if !ok {
+		return err
+	}
+	for _, d := range diags {
+		if d.Severity != hcl.DiagError {
+			continue
 		}
-	})
-	if diags.HasErrors() {
-		return nil, diags
-	}
-
-	var sc staticConfig
-
-	// Decode only variable blocks without interpolation.
-	if err := hclsimple.Decode(fn, dt, nil, &sc); err != nil {
-		return nil, err
-	}
-
-	// Set all variables to their default value if defined.
-	variables := make(map[string]cty.Value)
-	for _, variable := range sc.Variables {
-		variables[variable.Name] = cty.StringVal(variable.Default)
-	}
-
-	// Override default with values from environment.
-	for _, env := range os.Environ() {
-		parts := strings.SplitN(env, "=", 2)
-		name, value := parts[0], parts[1]
-		if _, ok := variables[name]; ok {
-			variables[name] = cty.StringVal(value)
+		if d.Subject != nil {
+			var dt []byte
+			for _, f := range files {
+				if d.Subject.Filename == f.Name {
+					dt = f.Data
+					break
+				}
+			}
+			src := errdefs.Source{
+				Info: &pb.SourceInfo{
+					Filename: d.Subject.Filename,
+					Data:     dt,
+				},
+				Ranges: []*pb.Range{toErrRange(d.Subject)},
+			}
+			err = errdefs.WithSource(err, src)
+			break
 		}
 	}
-
-	functions := make(map[string]function.Function)
-	for k, v := range stdlibFunctions {
-		functions[k] = v
-	}
-	for k, v := range userFunctions {
-		functions[k] = v
-	}
-
-	ctx := &hcl.EvalContext{
-		Variables: variables,
-		Functions: functions,
-	}
-
-	var c Config
-
-	// Decode with variables and functions.
-	if err := hclsimple.Decode(fn, dt, ctx, &c); err != nil {
-		return nil, err
-	}
-	return &c, nil
+	return err
+}
+
+func toErrRange(in *hcl.Range) *pb.Range {
+	return &pb.Range{
+		Start: pb.Position{Line: int32(in.Start.Line), Character: int32(in.Start.Column)},
+		End:   pb.Position{Line: int32(in.End.Line), Character: int32(in.End.Column)},
+	}
 }

bake/hcl_test.go

@@ -7,11 +7,9 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestParseHCL(t *testing.T) {
+func TestHCLBasic(t *testing.T) {
 	t.Parallel()
-
-	t.Run("Basic", func(t *testing.T) {
-		dt := []byte(`
+	dt := []byte(`
 		group "default" {
 			targets = ["db", "webapp"]
 		}
@@ -44,32 +42,91 @@ func TestParseHCL(t *testing.T) {
 		}
 		`)
 
-		c, err := ParseHCL(dt, "docker-bake.hcl")
-		require.NoError(t, err)
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"db", "webapp"}, c.Groups[0].Targets)
 
-		require.Equal(t, 1, len(c.Groups))
-		require.Equal(t, "default", c.Groups[0].Name)
-		require.Equal(t, []string{"db", "webapp"}, c.Groups[0].Targets)
+	require.Equal(t, 4, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "db")
+	require.Equal(t, "./db", *c.Targets[0].Context)
 
-		require.Equal(t, 4, len(c.Targets))
-		require.Equal(t, c.Targets[0].Name, "db")
-		require.Equal(t, "./db", *c.Targets[0].Context)
+	require.Equal(t, c.Targets[1].Name, "webapp")
+	require.Equal(t, 1, len(c.Targets[1].Args))
+	require.Equal(t, "123", c.Targets[1].Args["buildno"])
 
-		require.Equal(t, c.Targets[1].Name, "webapp")
-		require.Equal(t, 1, len(c.Targets[1].Args))
-		require.Equal(t, "123", c.Targets[1].Args["buildno"])
+	require.Equal(t, c.Targets[2].Name, "cross")
+	require.Equal(t, 2, len(c.Targets[2].Platforms))
+	require.Equal(t, []string{"linux/amd64", "linux/arm64"}, c.Targets[2].Platforms)
 
-		require.Equal(t, c.Targets[2].Name, "cross")
-		require.Equal(t, 2, len(c.Targets[2].Platforms))
-		require.Equal(t, []string{"linux/amd64", "linux/arm64"}, c.Targets[2].Platforms)
+	require.Equal(t, c.Targets[3].Name, "webapp-plus")
+	require.Equal(t, 1, len(c.Targets[3].Args))
+	require.Equal(t, map[string]string{"IAMCROSS": "true"}, c.Targets[3].Args)
+}
 
-		require.Equal(t, c.Targets[3].Name, "webapp-plus")
-		require.Equal(t, 1, len(c.Targets[3].Args))
-		require.Equal(t, map[string]string{"IAMCROSS": "true"}, c.Targets[3].Args)
-	})
+func TestHCLBasicInJSON(t *testing.T) {
+	dt := []byte(`
+		{
+			"group": {
+				"default": {
+					"targets": ["db", "webapp"]
+				}
+			},
+			"target": {
+				"db": {
+					"context": "./db",
+					"tags": ["docker.io/tonistiigi/db"]
+				},
+				"webapp": {
+					"context": "./dir",
+					"dockerfile": "Dockerfile-alternate",
+					"args": {
+						"buildno": "123"
+					}
+				},
+				"cross": {
+					"platforms": [
+						"linux/amd64",
+						"linux/arm64"
+					]
+				},
+				"webapp-plus": {
+					"inherits": ["webapp", "cross"],
+					"args": {
+						"IAMCROSS": "true"
+					}
+				}
+			}
+		}
+		`)
 
-	t.Run("WithFunctions", func(t *testing.T) {
-		dt := []byte(`
+	c, err := ParseFile(dt, "docker-bake.json")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"db", "webapp"}, c.Groups[0].Targets)
+
+	require.Equal(t, 4, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "db")
+	require.Equal(t, "./db", *c.Targets[0].Context)
+
+	require.Equal(t, c.Targets[1].Name, "webapp")
+	require.Equal(t, 1, len(c.Targets[1].Args))
+	require.Equal(t, "123", c.Targets[1].Args["buildno"])
+
+	require.Equal(t, c.Targets[2].Name, "cross")
+	require.Equal(t, 2, len(c.Targets[2].Platforms))
+	require.Equal(t, []string{"linux/amd64", "linux/arm64"}, c.Targets[2].Platforms)
+
+	require.Equal(t, c.Targets[3].Name, "webapp-plus")
+	require.Equal(t, 1, len(c.Targets[3].Args))
+	require.Equal(t, map[string]string{"IAMCROSS": "true"}, c.Targets[3].Args)
+}
+
+func TestHCLWithFunctions(t *testing.T) {
+	dt := []byte(`
 		group "default" {
 			targets = ["webapp"]
 		}
@@ -81,20 +138,20 @@ func TestParseHCL(t *testing.T) {
 		}
 		`)
 
-		c, err := ParseHCL(dt, "docker-bake.hcl")
-		require.NoError(t, err)
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
 
-		require.Equal(t, 1, len(c.Groups))
-		require.Equal(t, "default", c.Groups[0].Name)
-		require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
 
-		require.Equal(t, 1, len(c.Targets))
-		require.Equal(t, c.Targets[0].Name, "webapp")
-		require.Equal(t, "124", c.Targets[0].Args["buildno"])
-	})
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, "124", c.Targets[0].Args["buildno"])
+}
 
-	t.Run("WithUserDefinedFunctions", func(t *testing.T) {
-		dt := []byte(`
+func TestHCLWithUserDefinedFunctions(t *testing.T) {
+	dt := []byte(`
 		function "increment" {
 			params = [number]
 			result = number + 1
@@ -111,20 +168,20 @@ func TestParseHCL(t *testing.T) {
 		}
 		`)
 
-		c, err := ParseHCL(dt, "docker-bake.hcl")
-		require.NoError(t, err)
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
 
-		require.Equal(t, 1, len(c.Groups))
-		require.Equal(t, "default", c.Groups[0].Name)
-		require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
 
-		require.Equal(t, 1, len(c.Targets))
-		require.Equal(t, c.Targets[0].Name, "webapp")
-		require.Equal(t, "124", c.Targets[0].Args["buildno"])
-	})
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, "124", c.Targets[0].Args["buildno"])
+}
 
-	t.Run("WithVariables", func(t *testing.T) {
-		dt := []byte(`
+func TestHCLWithVariables(t *testing.T) {
+	dt := []byte(`
 		variable "BUILD_NUMBER" {
 			default = "123"
 		}
@@ -140,54 +197,588 @@ func TestParseHCL(t *testing.T) {
 		}
 		`)
 
-		c, err := ParseHCL(dt, "docker-bake.hcl")
-		require.NoError(t, err)
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
 
-		require.Equal(t, 1, len(c.Groups))
-		require.Equal(t, "default", c.Groups[0].Name)
-		require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
 
-		require.Equal(t, 1, len(c.Targets))
-		require.Equal(t, c.Targets[0].Name, "webapp")
-		require.Equal(t, "123", c.Targets[0].Args["buildno"])
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, "123", c.Targets[0].Args["buildno"])
 
-		os.Setenv("BUILD_NUMBER", "456")
+	os.Setenv("BUILD_NUMBER", "456")
 
-		c, err = ParseHCL(dt, "docker-bake.hcl")
-		require.NoError(t, err)
+	c, err = ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
 
-		require.Equal(t, 1, len(c.Groups))
-		require.Equal(t, "default", c.Groups[0].Name)
-		require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"webapp"}, c.Groups[0].Targets)
 
-		require.Equal(t, 1, len(c.Targets))
-		require.Equal(t, c.Targets[0].Name, "webapp")
-		require.Equal(t, "456", c.Targets[0].Args["buildno"])
-	})
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, "456", c.Targets[0].Args["buildno"])
+}
 
-	t.Run("WithIncorrectVariables", func(t *testing.T) {
-		dt := []byte(`
-		variable "DEFAULT_BUILD_NUMBER" {
-			default = "1"
+func TestHCLWithVariablesInFunctions(t *testing.T) {
+	dt := []byte(`
+		variable "REPO" {
+			default = "user/repo"
 		}
-
-		variable "BUILD_NUMBER" {
-			default = "${DEFAULT_BUILD_NUMBER}"
-		}
-
-		group "default" {
-			targets = ["webapp"]
+		function "tag" {
+			params = [tag]
+			result = ["${REPO}:${tag}"]
 		}
 
 		target "webapp" {
+			tags = tag("v1")
+		}
+		`)
+
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, []string{"user/repo:v1"}, c.Targets[0].Tags)
+
+	os.Setenv("REPO", "docker/buildx")
+
+	c, err = ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "webapp")
+	require.Equal(t, []string{"docker/buildx:v1"}, c.Targets[0].Tags)
+}
+
+func TestHCLMultiFileSharedVariables(t *testing.T) {
+	dt := []byte(`
+		variable "FOO" {
+			default = "abc"
+		}
+		target "app" {
 			args = {
-				buildno = "${BUILD_NUMBER}"
+				v1 = "pre-${FOO}"
+			}
+		}
+		`)
+	dt2 := []byte(`
+		target "app" {
+			args = {
+				v2 = "${FOO}-post"
 			}
 		}
 		`)
 
-		_, err := ParseHCL(dt, "docker-bake.hcl")
-		require.Error(t, err)
-		require.Contains(t, err.Error(), "docker-bake.hcl:7,17-37: Variables not allowed; Variables may not be used here.")
-	})
+	c, err := ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-abc", c.Targets[0].Args["v1"])
+	require.Equal(t, "abc-post", c.Targets[0].Args["v2"])
+
+	os.Setenv("FOO", "def")
+
+	c, err = ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-def", c.Targets[0].Args["v1"])
+	require.Equal(t, "def-post", c.Targets[0].Args["v2"])
+}
+
+func TestHCLVarsWithVars(t *testing.T) {
+	os.Unsetenv("FOO")
+	dt := []byte(`
+		variable "FOO" {
+			default = upper("${BASE}def")
+		}
+		variable "BAR" {
+			default = "-${FOO}-"
+		}
+		target "app" {
+			args = {
+				v1 = "pre-${BAR}"
+			}
+		}
+		`)
+	dt2 := []byte(`
+		variable "BASE" {
+			default = "abc"
+		}
+		target "app" {
+			args = {
+				v2 = "${FOO}-post"
+			}
+		}
+		`)
+
+	c, err := ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre--ABCDEF-", c.Targets[0].Args["v1"])
+	require.Equal(t, "ABCDEF-post", c.Targets[0].Args["v2"])
+
+	os.Setenv("BASE", "new")
+
+	c, err = ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre--NEWDEF-", c.Targets[0].Args["v1"])
+	require.Equal(t, "NEWDEF-post", c.Targets[0].Args["v2"])
+}
+
+func TestHCLTypedVariables(t *testing.T) {
+	os.Unsetenv("FOO")
+	dt := []byte(`
+		variable "FOO" {
+			default = 3
+		}
+		variable "IS_FOO" {
+			default = true
+		}
+		target "app" {
+			args = {
+				v1 = FOO > 5 ? "higher" : "lower" 
+				v2 = IS_FOO ? "yes" : "no"
+			}
+		}
+		`)
+
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "lower", c.Targets[0].Args["v1"])
+	require.Equal(t, "yes", c.Targets[0].Args["v2"])
+
+	os.Setenv("FOO", "5.1")
+	os.Setenv("IS_FOO", "0")
+
+	c, err = ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "higher", c.Targets[0].Args["v1"])
+	require.Equal(t, "no", c.Targets[0].Args["v2"])
+
+	os.Setenv("FOO", "NaN")
+	_, err = ParseFile(dt, "docker-bake.hcl")
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "failed to parse FOO as number")
+
+	os.Setenv("FOO", "0")
+	os.Setenv("IS_FOO", "maybe")
+
+	_, err = ParseFile(dt, "docker-bake.hcl")
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "failed to parse IS_FOO as bool")
+}
+
+func TestHCLVariableCycle(t *testing.T) {
+	dt := []byte(`
+		variable "FOO" {
+			default = BAR
+		}
+		variable "FOO2" {
+			default = FOO
+		}
+		variable "BAR" {
+			default = FOO
+		}
+		target "app" {}
+		`)
+
+	_, err := ParseFile(dt, "docker-bake.hcl")
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "variable cycle not allowed")
+}
+
+func TestHCLAttrs(t *testing.T) {
+	dt := []byte(`
+		FOO="abc"
+		BAR="attr-${FOO}def"
+		target "app" {
+			args = {
+				"v1": BAR
+			}
+		}
+		`)
+
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "attr-abcdef", c.Targets[0].Args["v1"])
+
+	// env does not apply if no variable
+	os.Setenv("FOO", "bar")
+	c, err = ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "attr-abcdef", c.Targets[0].Args["v1"])
+	// attr-multifile
+}
+
+func TestHCLAttrsCustomType(t *testing.T) {
+	dt := []byte(`
+		platforms=["linux/arm64", "linux/amd64"]
+		target "app" {
+			platforms = platforms
+			args = {
+				"v1": platforms[0]
+			}
+		}
+		`)
+
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, []string{"linux/arm64", "linux/amd64"}, c.Targets[0].Platforms)
+	require.Equal(t, "linux/arm64", c.Targets[0].Args["v1"])
+}
+
+func TestHCLMultiFileAttrs(t *testing.T) {
+	os.Unsetenv("FOO")
+	dt := []byte(`
+		variable "FOO" {
+			default = "abc"
+		}
+		target "app" {
+			args = {
+				v1 = "pre-${FOO}"
+			}
+		}
+		`)
+	dt2 := []byte(`
+		FOO="def"
+		`)
+
+	c, err := ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-def", c.Targets[0].Args["v1"])
+
+	os.Setenv("FOO", "ghi")
+
+	c, err = ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.hcl"},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-ghi", c.Targets[0].Args["v1"])
+}
+
+func TestJSONAttributes(t *testing.T) {
+	dt := []byte(`{"FOO": "abc", "variable": {"BAR": {"default": "def"}}, "target": { "app": { "args": {"v1": "pre-${FOO}-${BAR}"}} } }`)
+
+	c, err := ParseFile(dt, "docker-bake.json")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-abc-def", c.Targets[0].Args["v1"])
+}
+
+func TestJSONFunctions(t *testing.T) {
+	dt := []byte(`{
+	"FOO": "abc",
+	"function": {
+		"myfunc": {
+			"params": ["inp"],
+			"result": "<${upper(inp)}-${FOO}>"
+		}
+	},
+	"target": {
+		"app": {
+			"args": {
+				"v1": "pre-${myfunc(\"foo\")}"
+			}
+		}
+	}}`)
+
+	c, err := ParseFile(dt, "docker-bake.json")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "pre-<FOO-abc>", c.Targets[0].Args["v1"])
+}
+
+func TestHCLFunctionInAttr(t *testing.T) {
+	dt := []byte(`
+	function "brace" {
+		params = [inp]
+		result = "[${inp}]"
+	}
+	function "myupper" {
+		params = [val]
+		result = "${upper(val)} <> ${brace(v2)}"
+	}
+
+		v1=myupper("foo")
+		v2=lower("BAZ")
+		target "app" {
+			args = {
+				"v1": v1
+			}
+		}
+		`)
+
+	c, err := ParseFile(dt, "docker-bake.hcl")
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "FOO <> [baz]", c.Targets[0].Args["v1"])
+}
+
+func TestHCLCombineCompose(t *testing.T) {
+	dt := []byte(`
+		target "app" {
+			context = "dir"
+			args = {
+				v1 = "foo"
+			}
+		}
+		`)
+	dt2 := []byte(`
+version: "3"
+
+services:
+  app:
+    build:
+      dockerfile: Dockerfile-alternate
+      args:
+        v2: "bar"
+`)
+
+	c, err := ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+		{Data: dt2, Name: "c2.yml"},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "foo", c.Targets[0].Args["v1"])
+	require.Equal(t, "bar", c.Targets[0].Args["v2"])
+	require.Equal(t, "dir", *c.Targets[0].Context)
+	require.Equal(t, "Dockerfile-alternate", *c.Targets[0].Dockerfile)
+}
+
+func TestHCLBuiltinVars(t *testing.T) {
+	dt := []byte(`
+		target "app" {
+			context = BAKE_CMD_CONTEXT
+			dockerfile = "test"
+		}
+		`)
+
+	c, err := ParseFiles([]File{
+		{Data: dt, Name: "c1.hcl"},
+	}, map[string]string{
+		"BAKE_CMD_CONTEXT": "foo",
+	})
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Targets))
+	require.Equal(t, c.Targets[0].Name, "app")
+	require.Equal(t, "foo", *c.Targets[0].Context)
+	require.Equal(t, "test", *c.Targets[0].Dockerfile)
+}
+
+func TestCombineHCLAndJSONTargets(t *testing.T) {
+	c, err := ParseFiles([]File{
+		{
+			Name: "docker-bake.hcl",
+			Data: []byte(`
+group "default" {
+  targets = ["a"]
+}
+
+target "metadata-a" {}
+target "metadata-b" {}
+
+target "a" {
+  inherits = ["metadata-a"]
+  context = "."
+  target = "a"
+}
+
+target "b" {
+  inherits = ["metadata-b"]
+  context = "."
+  target = "b"
+}`),
+		},
+		{
+			Name: "metadata-a.json",
+			Data: []byte(`
+{
+  "target": [{
+    "metadata-a": [{
+      "tags": [
+        "app/a:1.0.0",
+        "app/a:latest"
+      ]
+    }]
+  }]
+}`),
+		},
+		{
+			Name: "metadata-b.json",
+			Data: []byte(`
+{
+  "target": [{
+    "metadata-b": [{
+      "tags": [
+        "app/b:1.0.0",
+        "app/b:latest"
+      ]
+    }]
+  }]
+}`),
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"a"}, c.Groups[0].Targets)
+
+	require.Equal(t, 4, len(c.Targets))
+
+	require.Equal(t, c.Targets[0].Name, "metadata-a")
+	require.Equal(t, []string{"app/a:1.0.0", "app/a:latest"}, c.Targets[0].Tags)
+
+	require.Equal(t, c.Targets[1].Name, "metadata-b")
+	require.Equal(t, []string{"app/b:1.0.0", "app/b:latest"}, c.Targets[1].Tags)
+
+	require.Equal(t, c.Targets[2].Name, "a")
+	require.Equal(t, ".", *c.Targets[2].Context)
+	require.Equal(t, "a", *c.Targets[2].Target)
+
+	require.Equal(t, c.Targets[3].Name, "b")
+	require.Equal(t, ".", *c.Targets[3].Context)
+	require.Equal(t, "b", *c.Targets[3].Target)
+}
+
+func TestCombineHCLAndJSONVars(t *testing.T) {
+	c, err := ParseFiles([]File{
+		{
+			Name: "docker-bake.hcl",
+			Data: []byte(`
+variable "ABC" {
+  default = "foo"
+}
+variable "DEF" {
+  default = ""
+}
+group "default" {
+  targets = ["one"]
+}
+target "one" {
+  args = {
+    a = "pre-${ABC}"
+  }
+}
+target "two" {
+  args = {
+    b = "pre-${DEF}"
+  }
+}`),
+		},
+		{
+			Name: "foo.json",
+			Data: []byte(`{"variable": {"DEF": {"default": "bar"}}, "target": { "one": { "args": {"a": "pre-${ABC}-${DEF}"}} } }`),
+		},
+		{
+			Name: "bar.json",
+			Data: []byte(`{"ABC": "ghi", "DEF": "jkl"}`),
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"one"}, c.Groups[0].Targets)
+
+	require.Equal(t, 2, len(c.Targets))
+
+	require.Equal(t, c.Targets[0].Name, "one")
+	require.Equal(t, map[string]string{"a": "pre-ghi-jkl"}, c.Targets[0].Args)
+
+	require.Equal(t, c.Targets[1].Name, "two")
+	require.Equal(t, map[string]string{"b": "pre-jkl"}, c.Targets[1].Args)
+}
+
+func TestEmptyVariableJSON(t *testing.T) {
+	dt := []byte(`{
+	  "variable": {
+	    "VAR": {}
+	  }
+	}`)
+	_, err := ParseFile(dt, "docker-bake.json")
+	require.NoError(t, err)
+}
+
+func TestFunctionNoParams(t *testing.T) {
+	dt := []byte(`
+		function "foo" {
+			result = "bar"
+		}
+		target "foo_target" {
+			args = {
+				test = foo()
+			}
+		}
+		`)
+
+	_, err := ParseFile(dt, "docker-bake.hcl")
+	require.Error(t, err)
+}
+
+func TestFunctionNoResult(t *testing.T) {
+	dt := []byte(`
+		function "foo" {
+			params = ["a"]
+		}
+		`)
+
+	_, err := ParseFile(dt, "docker-bake.hcl")
+	require.Error(t, err)
 }

bake/hclparser/expr.go

@@ -0,0 +1,153 @@
+package hclparser
+
+import (
+	"reflect"
+	"unsafe"
+
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
+	"github.com/pkg/errors"
+)
+
+func funcCalls(exp hcl.Expression) ([]string, hcl.Diagnostics) {
+	node, ok := exp.(hclsyntax.Node)
+	if !ok {
+		fns, err := jsonFuncCallsRecursive(exp)
+		if err != nil {
+			return nil, hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid expression",
+					Detail:   err.Error(),
+					Subject:  exp.Range().Ptr(),
+					Context:  exp.Range().Ptr(),
+				},
+			}
+		}
+		return fns, nil
+	}
+
+	var funcnames []string
+	hcldiags := hclsyntax.VisitAll(node, func(n hclsyntax.Node) hcl.Diagnostics {
+		if fe, ok := n.(*hclsyntax.FunctionCallExpr); ok {
+			funcnames = append(funcnames, fe.Name)
+		}
+		return nil
+	})
+	if hcldiags.HasErrors() {
+		return nil, hcldiags
+	}
+	return funcnames, nil
+}
+
+func jsonFuncCallsRecursive(exp hcl.Expression) ([]string, error) {
+	je, ok := exp.(jsonExp)
+	if !ok {
+		return nil, errors.Errorf("invalid expression type %T", exp)
+	}
+	m := map[string]struct{}{}
+	for _, e := range elementExpressions(je, exp) {
+		if err := appendJSONFuncCalls(e, m); err != nil {
+			return nil, err
+		}
+	}
+	arr := make([]string, 0, len(m))
+	for n := range m {
+		arr = append(arr, n)
+	}
+	return arr, nil
+}
+
+func appendJSONFuncCalls(exp hcl.Expression, m map[string]struct{}) error {
+	v := reflect.ValueOf(exp)
+	if v.Kind() != reflect.Ptr || v.IsNil() {
+		return errors.Errorf("invalid json expression kind %T %v", exp, v.Kind())
+	}
+	src := v.Elem().FieldByName("src")
+	if src.IsZero() {
+		return errors.Errorf("%v has no property src", v.Elem().Type())
+	}
+	if src.Kind() != reflect.Interface {
+		return errors.Errorf("%v src is not interface: %v", src.Type(), src.Kind())
+	}
+	src = src.Elem()
+	if src.IsNil() {
+		return nil
+	}
+	if src.Kind() == reflect.Ptr {
+		src = src.Elem()
+	}
+	if src.Kind() != reflect.Struct {
+		return errors.Errorf("%v is not struct: %v", src.Type(), src.Kind())
+	}
+
+	// hcl/v2/json/ast#stringVal
+	val := src.FieldByName("Value")
+	if val.IsZero() {
+		return nil
+	}
+	rng := src.FieldByName("SrcRange")
+	if val.IsZero() {
+		return nil
+	}
+	var stringVal struct {
+		Value    string
+		SrcRange hcl.Range
+	}
+
+	if !val.Type().AssignableTo(reflect.ValueOf(stringVal.Value).Type()) {
+		return nil
+	}
+	if !rng.Type().AssignableTo(reflect.ValueOf(stringVal.SrcRange).Type()) {
+		return nil
+	}
+	// reflect.Set does not work for unexported fields
+	stringVal.Value = *(*string)(unsafe.Pointer(val.UnsafeAddr()))
+	stringVal.SrcRange = *(*hcl.Range)(unsafe.Pointer(rng.UnsafeAddr()))
+
+	expr, diags := hclsyntax.ParseExpression([]byte(stringVal.Value), stringVal.SrcRange.Filename, stringVal.SrcRange.Start)
+	if diags.HasErrors() {
+		return nil
+	}
+
+	fns, err := funcCalls(expr)
+	if err != nil {
+		return err
+	}
+
+	for _, fn := range fns {
+		m[fn] = struct{}{}
+	}
+
+	return nil
+}
+
+type jsonExp interface {
+	ExprList() []hcl.Expression
+	ExprMap() []hcl.KeyValuePair
+}
+
+func elementExpressions(je jsonExp, exp hcl.Expression) []hcl.Expression {
+	list := je.ExprList()
+	if len(list) != 0 {
+		exp := make([]hcl.Expression, 0, len(list))
+		for _, e := range list {
+			if je, ok := e.(jsonExp); ok {
+				exp = append(exp, elementExpressions(je, e)...)
+			}
+		}
+		return exp
+	}
+	kvlist := je.ExprMap()
+	if len(kvlist) != 0 {
+		exp := make([]hcl.Expression, 0, len(kvlist)*2)
+		for _, p := range kvlist {
+			exp = append(exp, p.Key)
+			if je, ok := p.Value.(jsonExp); ok {
+				exp = append(exp, elementExpressions(je, p.Value)...)
+			}
+		}
+		return exp
+	}
+	return []hcl.Expression{exp}
+}

bake/hclparser/hclparser.go

@@ -0,0 +1,571 @@
+package hclparser
+
+import (
+	"fmt"
+	"math"
+	"math/big"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"github.com/docker/buildx/util/userfunc"
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/gohcl"
+	"github.com/pkg/errors"
+	"github.com/zclconf/go-cty/cty"
+)
+
+type Opt struct {
+	LookupVar     func(string) (string, bool)
+	Vars          map[string]string
+	ValidateLabel func(string) error
+}
+
+type variable struct {
+	Name    string         `json:"-" hcl:"name,label"`
+	Default *hcl.Attribute `json:"default,omitempty" hcl:"default,optional"`
+	Body    hcl.Body       `json:"-" hcl:",body"`
+}
+
+type functionDef struct {
+	Name     string         `json:"-" hcl:"name,label"`
+	Params   *hcl.Attribute `json:"params,omitempty" hcl:"params"`
+	Variadic *hcl.Attribute `json:"variadic_param,omitempty" hcl:"variadic_params"`
+	Result   *hcl.Attribute `json:"result,omitempty" hcl:"result"`
+}
+
+type inputs struct {
+	Variables []*variable    `hcl:"variable,block"`
+	Functions []*functionDef `hcl:"function,block"`
+
+	Remain hcl.Body `json:"-" hcl:",remain"`
+}
+
+type parser struct {
+	opt Opt
+
+	vars  map[string]*variable
+	attrs map[string]*hcl.Attribute
+	funcs map[string]*functionDef
+
+	ectx *hcl.EvalContext
+
+	progress  map[string]struct{}
+	progressF map[string]struct{}
+	doneF     map[string]struct{}
+}
+
+func (p *parser) loadDeps(exp hcl.Expression, exclude map[string]struct{}) hcl.Diagnostics {
+	fns, hcldiags := funcCalls(exp)
+	if hcldiags.HasErrors() {
+		return hcldiags
+	}
+
+	for _, fn := range fns {
+		if err := p.resolveFunction(fn); err != nil {
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid expression",
+					Detail:   err.Error(),
+					Subject:  exp.Range().Ptr(),
+					Context:  exp.Range().Ptr(),
+				},
+			}
+		}
+	}
+
+	for _, v := range exp.Variables() {
+		if _, ok := exclude[v.RootName()]; ok {
+			continue
+		}
+		if err := p.resolveValue(v.RootName()); err != nil {
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid expression",
+					Detail:   err.Error(),
+					Subject:  v.SourceRange().Ptr(),
+					Context:  v.SourceRange().Ptr(),
+				},
+			}
+		}
+	}
+
+	return nil
+}
+
+func (p *parser) resolveFunction(name string) error {
+	if _, ok := p.doneF[name]; ok {
+		return nil
+	}
+	f, ok := p.funcs[name]
+	if !ok {
+		if _, ok := p.ectx.Functions[name]; ok {
+			return nil
+		}
+		return errors.Errorf("undefined function %s", name)
+	}
+	if _, ok := p.progressF[name]; ok {
+		return errors.Errorf("function cycle not allowed for %s", name)
+	}
+	p.progressF[name] = struct{}{}
+
+	if f.Result == nil {
+		return errors.Errorf("empty result not allowed for %s", name)
+	}
+	if f.Params == nil {
+		return errors.Errorf("empty params not allowed for %s", name)
+	}
+
+	paramExprs, paramsDiags := hcl.ExprList(f.Params.Expr)
+	if paramsDiags.HasErrors() {
+		return paramsDiags
+	}
+	var diags hcl.Diagnostics
+	params := map[string]struct{}{}
+	for _, paramExpr := range paramExprs {
+		param := hcl.ExprAsKeyword(paramExpr)
+		if param == "" {
+			diags = append(diags, &hcl.Diagnostic{
+				Severity: hcl.DiagError,
+				Summary:  "Invalid param element",
+				Detail:   "Each parameter name must be an identifier.",
+				Subject:  paramExpr.Range().Ptr(),
+			})
+		}
+		params[param] = struct{}{}
+	}
+	var variadic hcl.Expression
+	if f.Variadic != nil {
+		variadic = f.Variadic.Expr
+		param := hcl.ExprAsKeyword(variadic)
+		if param == "" {
+			diags = append(diags, &hcl.Diagnostic{
+				Severity: hcl.DiagError,
+				Summary:  "Invalid param element",
+				Detail:   "Each parameter name must be an identifier.",
+				Subject:  f.Variadic.Range.Ptr(),
+			})
+		}
+		params[param] = struct{}{}
+	}
+	if diags.HasErrors() {
+		return diags
+	}
+
+	if diags := p.loadDeps(f.Result.Expr, params); diags.HasErrors() {
+		return diags
+	}
+
+	v, diags := userfunc.NewFunction(f.Params.Expr, variadic, f.Result.Expr, func() *hcl.EvalContext {
+		return p.ectx
+	})
+	if diags.HasErrors() {
+		return diags
+	}
+	p.doneF[name] = struct{}{}
+	p.ectx.Functions[name] = v
+
+	return nil
+}
+
+func (p *parser) resolveValue(name string) (err error) {
+	if _, ok := p.ectx.Variables[name]; ok {
+		return nil
+	}
+	if _, ok := p.progress[name]; ok {
+		return errors.Errorf("variable cycle not allowed for %s", name)
+	}
+	p.progress[name] = struct{}{}
+
+	var v *cty.Value
+	defer func() {
+		if v != nil {
+			p.ectx.Variables[name] = *v
+		}
+	}()
+
+	def, ok := p.attrs[name]
+	if _, builtin := p.opt.Vars[name]; !ok && !builtin {
+		vr, ok := p.vars[name]
+		if !ok {
+			return errors.Errorf("undefined variable %q", name)
+		}
+		def = vr.Default
+	}
+
+	if def == nil {
+		val, ok := p.opt.Vars[name]
+		if !ok {
+			val, _ = p.opt.LookupVar(name)
+		}
+		vv := cty.StringVal(val)
+		v = &vv
+		return
+	}
+
+	if diags := p.loadDeps(def.Expr, nil); diags.HasErrors() {
+		return diags
+	}
+	vv, diags := def.Expr.Value(p.ectx)
+	if diags.HasErrors() {
+		return diags
+	}
+
+	_, isVar := p.vars[name]
+
+	if envv, ok := p.opt.LookupVar(name); ok && isVar {
+		if vv.Type().Equals(cty.Bool) {
+			b, err := strconv.ParseBool(envv)
+			if err != nil {
+				return errors.Wrapf(err, "failed to parse %s as bool", name)
+			}
+			vv := cty.BoolVal(b)
+			v = &vv
+			return nil
+		} else if vv.Type().Equals(cty.String) {
+			vv := cty.StringVal(envv)
+			v = &vv
+			return nil
+		} else if vv.Type().Equals(cty.Number) {
+			n, err := strconv.ParseFloat(envv, 64)
+			if err == nil && (math.IsNaN(n) || math.IsInf(n, 0)) {
+				err = errors.Errorf("invalid number value")
+			}
+			if err != nil {
+				return errors.Wrapf(err, "failed to parse %s as number", name)
+			}
+			vv := cty.NumberVal(big.NewFloat(n))
+			v = &vv
+			return nil
+		} else {
+			// TODO: support lists with csv values
+			return errors.Errorf("unsupported type %s for variable %s", v.Type(), name)
+		}
+	}
+	v = &vv
+	return nil
+}
+
+func Parse(b hcl.Body, opt Opt, val interface{}) hcl.Diagnostics {
+	reserved := map[string]struct{}{}
+	schema, _ := gohcl.ImpliedBodySchema(val)
+
+	for _, bs := range schema.Blocks {
+		reserved[bs.Type] = struct{}{}
+	}
+	for k := range opt.Vars {
+		reserved[k] = struct{}{}
+	}
+
+	var defs inputs
+	if err := gohcl.DecodeBody(b, nil, &defs); err != nil {
+		return err
+	}
+	defsSchema, _ := gohcl.ImpliedBodySchema(defs)
+
+	if opt.LookupVar == nil {
+		opt.LookupVar = func(string) (string, bool) {
+			return "", false
+		}
+	}
+
+	if opt.ValidateLabel == nil {
+		opt.ValidateLabel = func(string) error {
+			return nil
+		}
+	}
+
+	p := &parser{
+		opt: opt,
+
+		vars:  map[string]*variable{},
+		attrs: map[string]*hcl.Attribute{},
+		funcs: map[string]*functionDef{},
+
+		progress:  map[string]struct{}{},
+		progressF: map[string]struct{}{},
+		doneF:     map[string]struct{}{},
+		ectx: &hcl.EvalContext{
+			Variables: map[string]cty.Value{},
+			Functions: stdlibFunctions,
+		},
+	}
+
+	for _, v := range defs.Variables {
+		// TODO: validate name
+		if _, ok := reserved[v.Name]; ok {
+			continue
+		}
+		p.vars[v.Name] = v
+	}
+	for _, v := range defs.Functions {
+		// TODO: validate name
+		if _, ok := reserved[v.Name]; ok {
+			continue
+		}
+		p.funcs[v.Name] = v
+	}
+
+	content, b, diags := b.PartialContent(schema)
+	if diags.HasErrors() {
+		return diags
+	}
+
+	blocks, b, diags := b.PartialContent(defsSchema)
+	if diags.HasErrors() {
+		return diags
+	}
+
+	attrs, diags := b.JustAttributes()
+	if diags.HasErrors() {
+		if d := removeAttributesDiags(diags, reserved, p.vars); len(d) > 0 {
+			return d
+		}
+	}
+
+	for _, v := range attrs {
+		if _, ok := reserved[v.Name]; ok {
+			continue
+		}
+		p.attrs[v.Name] = v
+	}
+	delete(p.attrs, "function")
+
+	for k := range p.opt.Vars {
+		_ = p.resolveValue(k)
+	}
+
+	for k := range p.attrs {
+		if err := p.resolveValue(k); err != nil {
+			if diags, ok := err.(hcl.Diagnostics); ok {
+				return diags
+			}
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid attribute",
+					Detail:   err.Error(),
+					Subject:  &p.attrs[k].Range,
+					Context:  &p.attrs[k].Range,
+				},
+			}
+		}
+	}
+
+	for k := range p.vars {
+		if err := p.resolveValue(k); err != nil {
+			if diags, ok := err.(hcl.Diagnostics); ok {
+				return diags
+			}
+			r := p.vars[k].Body.MissingItemRange()
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid value",
+					Detail:   err.Error(),
+					Subject:  &r,
+					Context:  &r,
+				},
+			}
+		}
+	}
+
+	for k := range p.funcs {
+		if err := p.resolveFunction(k); err != nil {
+			if diags, ok := err.(hcl.Diagnostics); ok {
+				return diags
+			}
+			var subject *hcl.Range
+			var context *hcl.Range
+			if p.funcs[k].Params != nil {
+				subject = &p.funcs[k].Params.Range
+				context = subject
+			} else {
+				for _, block := range blocks.Blocks {
+					if block.Type == "function" && len(block.Labels) == 1 && block.Labels[0] == k {
+						subject = &block.LabelRanges[0]
+						context = &block.DefRange
+						break
+					}
+				}
+			}
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid function",
+					Detail:   err.Error(),
+					Subject:  subject,
+					Context:  context,
+				},
+			}
+		}
+	}
+
+	for _, a := range content.Attributes {
+		return hcl.Diagnostics{
+			&hcl.Diagnostic{
+				Severity: hcl.DiagError,
+				Summary:  "Invalid attribute",
+				Detail:   "global attributes currently not supported",
+				Subject:  &a.Range,
+				Context:  &a.Range,
+			},
+		}
+	}
+
+	m := map[string]map[string][]*hcl.Block{}
+	for _, b := range content.Blocks {
+		if len(b.Labels) == 0 || len(b.Labels) > 1 {
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid block",
+					Detail:   fmt.Sprintf("invalid block label: %v", b.Labels),
+					Subject:  &b.LabelRanges[0],
+					Context:  &b.LabelRanges[0],
+				},
+			}
+		}
+		bm, ok := m[b.Type]
+		if !ok {
+			bm = map[string][]*hcl.Block{}
+			m[b.Type] = bm
+		}
+
+		lbl := b.Labels[0]
+		bm[lbl] = append(bm[lbl], b)
+	}
+
+	vt := reflect.ValueOf(val).Elem().Type()
+	numFields := vt.NumField()
+
+	type value struct {
+		reflect.Value
+		idx int
+	}
+	type field struct {
+		idx    int
+		typ    reflect.Type
+		values map[string]value
+	}
+	types := map[string]field{}
+
+	for i := 0; i < numFields; i++ {
+		tags := strings.Split(vt.Field(i).Tag.Get("hcl"), ",")
+
+		types[tags[0]] = field{
+			idx:    i,
+			typ:    vt.Field(i).Type,
+			values: make(map[string]value),
+		}
+	}
+
+	diags = hcl.Diagnostics{}
+	for _, b := range content.Blocks {
+		v := reflect.ValueOf(val)
+
+		t, ok := types[b.Type]
+		if !ok {
+			continue
+		}
+
+		vv := reflect.New(t.typ.Elem().Elem())
+		diag := gohcl.DecodeBody(b.Body, p.ectx, vv.Interface())
+		if diag.HasErrors() {
+			diags = append(diags, diag...)
+			continue
+		}
+
+		if err := opt.ValidateLabel(b.Labels[0]); err != nil {
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid name",
+					Detail:   err.Error(),
+					Subject:  &b.LabelRanges[0],
+				},
+			}
+		}
+
+		lblIndex := setLabel(vv, b.Labels[0])
+
+		oldValue, exists := t.values[b.Labels[0]]
+		if !exists && lblIndex != -1 {
+			if v.Elem().Field(t.idx).Type().Kind() == reflect.Slice {
+				for i := 0; i < v.Elem().Field(t.idx).Len(); i++ {
+					if b.Labels[0] == v.Elem().Field(t.idx).Index(i).Elem().Field(lblIndex).String() {
+						exists = true
+						oldValue = value{Value: v.Elem().Field(t.idx).Index(i), idx: i}
+						break
+					}
+				}
+			}
+
+		}
+		if exists {
+			if m := oldValue.Value.MethodByName("Merge"); m.IsValid() {
+				m.Call([]reflect.Value{vv})
+			} else {
+				v.Elem().Field(t.idx).Index(oldValue.idx).Set(vv)
+			}
+		} else {
+			slice := v.Elem().Field(t.idx)
+			if slice.IsNil() {
+				slice = reflect.New(t.typ).Elem()
+			}
+			t.values[b.Labels[0]] = value{Value: vv, idx: slice.Len()}
+			v.Elem().Field(t.idx).Set(reflect.Append(slice, vv))
+		}
+	}
+	if diags.HasErrors() {
+		return diags
+	}
+
+	return nil
+}
+
+func setLabel(v reflect.Value, lbl string) int {
+	// cache field index?
+	numFields := v.Elem().Type().NumField()
+	for i := 0; i < numFields; i++ {
+		for _, t := range strings.Split(v.Elem().Type().Field(i).Tag.Get("hcl"), ",") {
+			if t == "label" {
+				v.Elem().Field(i).Set(reflect.ValueOf(lbl))
+				return i
+			}
+		}
+	}
+	return -1
+}
+
+func removeAttributesDiags(diags hcl.Diagnostics, reserved map[string]struct{}, vars map[string]*variable) hcl.Diagnostics {
+	var fdiags hcl.Diagnostics
+	for _, d := range diags {
+		if fout := func(d *hcl.Diagnostic) bool {
+			// https://github.com/docker/buildx/pull/541
+			if d.Detail == "Blocks are not allowed here." {
+				return true
+			}
+			for r := range reserved {
+				// JSON body objects don't handle repeated blocks like HCL but
+				// reserved name attributes should be allowed when multi bodies are merged.
+				// https://github.com/hashicorp/hcl/blob/main/json/spec.md#blocks
+				if strings.HasPrefix(d.Detail, fmt.Sprintf(`Argument "%s" was already set at `, r)) {
+					return true
+				}
+			}
+			for v := range vars {
+				// Do the same for global variables
+				if strings.HasPrefix(d.Detail, fmt.Sprintf(`Argument "%s" was already set at `, v)) {
+					return true
+				}
+			}
+			return false
+		}(d); !fout {
+			fdiags = append(fdiags, d)
+		}
+	}
+	return fdiags
+}

bake/hclparser/stdlib.go

@@ -0,0 +1,126 @@
+package hclparser
+
+import (
+	"time"
+
+	"github.com/hashicorp/go-cty-funcs/cidr"
+	"github.com/hashicorp/go-cty-funcs/crypto"
+	"github.com/hashicorp/go-cty-funcs/encoding"
+	"github.com/hashicorp/go-cty-funcs/uuid"
+	"github.com/hashicorp/hcl/v2/ext/tryfunc"
+	"github.com/hashicorp/hcl/v2/ext/typeexpr"
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/function"
+	"github.com/zclconf/go-cty/cty/function/stdlib"
+)
+
+var stdlibFunctions = map[string]function.Function{
+	"absolute":               stdlib.AbsoluteFunc,
+	"add":                    stdlib.AddFunc,
+	"and":                    stdlib.AndFunc,
+	"base64decode":           encoding.Base64DecodeFunc,
+	"base64encode":           encoding.Base64EncodeFunc,
+	"bcrypt":                 crypto.BcryptFunc,
+	"byteslen":               stdlib.BytesLenFunc,
+	"bytesslice":             stdlib.BytesSliceFunc,
+	"can":                    tryfunc.CanFunc,
+	"ceil":                   stdlib.CeilFunc,
+	"chomp":                  stdlib.ChompFunc,
+	"chunklist":              stdlib.ChunklistFunc,
+	"cidrhost":               cidr.HostFunc,
+	"cidrnetmask":            cidr.NetmaskFunc,
+	"cidrsubnet":             cidr.SubnetFunc,
+	"cidrsubnets":            cidr.SubnetsFunc,
+	"csvdecode":              stdlib.CSVDecodeFunc,
+	"coalesce":               stdlib.CoalesceFunc,
+	"coalescelist":           stdlib.CoalesceListFunc,
+	"compact":                stdlib.CompactFunc,
+	"concat":                 stdlib.ConcatFunc,
+	"contains":               stdlib.ContainsFunc,
+	"convert":                typeexpr.ConvertFunc,
+	"distinct":               stdlib.DistinctFunc,
+	"divide":                 stdlib.DivideFunc,
+	"element":                stdlib.ElementFunc,
+	"equal":                  stdlib.EqualFunc,
+	"flatten":                stdlib.FlattenFunc,
+	"floor":                  stdlib.FloorFunc,
+	"formatdate":             stdlib.FormatDateFunc,
+	"format":                 stdlib.FormatFunc,
+	"formatlist":             stdlib.FormatListFunc,
+	"greaterthan":            stdlib.GreaterThanFunc,
+	"greaterthanorequalto":   stdlib.GreaterThanOrEqualToFunc,
+	"hasindex":               stdlib.HasIndexFunc,
+	"indent":                 stdlib.IndentFunc,
+	"index":                  stdlib.IndexFunc,
+	"int":                    stdlib.IntFunc,
+	"jsondecode":             stdlib.JSONDecodeFunc,
+	"jsonencode":             stdlib.JSONEncodeFunc,
+	"keys":                   stdlib.KeysFunc,
+	"join":                   stdlib.JoinFunc,
+	"length":                 stdlib.LengthFunc,
+	"lessthan":               stdlib.LessThanFunc,
+	"lessthanorequalto":      stdlib.LessThanOrEqualToFunc,
+	"log":                    stdlib.LogFunc,
+	"lookup":                 stdlib.LookupFunc,
+	"lower":                  stdlib.LowerFunc,
+	"max":                    stdlib.MaxFunc,
+	"md5":                    crypto.Md5Func,
+	"merge":                  stdlib.MergeFunc,
+	"min":                    stdlib.MinFunc,
+	"modulo":                 stdlib.ModuloFunc,
+	"multiply":               stdlib.MultiplyFunc,
+	"negate":                 stdlib.NegateFunc,
+	"notequal":               stdlib.NotEqualFunc,
+	"not":                    stdlib.NotFunc,
+	"or":                     stdlib.OrFunc,
+	"parseint":               stdlib.ParseIntFunc,
+	"pow":                    stdlib.PowFunc,
+	"range":                  stdlib.RangeFunc,
+	"regexall":               stdlib.RegexAllFunc,
+	"regex":                  stdlib.RegexFunc,
+	"regex_replace":          stdlib.RegexReplaceFunc,
+	"reverse":                stdlib.ReverseFunc,
+	"reverselist":            stdlib.ReverseListFunc,
+	"rsadecrypt":             crypto.RsaDecryptFunc,
+	"sethaselement":          stdlib.SetHasElementFunc,
+	"setintersection":        stdlib.SetIntersectionFunc,
+	"setproduct":             stdlib.SetProductFunc,
+	"setsubtract":            stdlib.SetSubtractFunc,
+	"setsymmetricdifference": stdlib.SetSymmetricDifferenceFunc,
+	"setunion":               stdlib.SetUnionFunc,
+	"sha1":                   crypto.Sha1Func,
+	"sha256":                 crypto.Sha256Func,
+	"sha512":                 crypto.Sha512Func,
+	"signum":                 stdlib.SignumFunc,
+	"slice":                  stdlib.SliceFunc,
+	"sort":                   stdlib.SortFunc,
+	"split":                  stdlib.SplitFunc,
+	"strlen":                 stdlib.StrlenFunc,
+	"substr":                 stdlib.SubstrFunc,
+	"subtract":               stdlib.SubtractFunc,
+	"timeadd":                stdlib.TimeAddFunc,
+	"timestamp":              timestampFunc,
+	"title":                  stdlib.TitleFunc,
+	"trim":                   stdlib.TrimFunc,
+	"trimprefix":             stdlib.TrimPrefixFunc,
+	"trimspace":              stdlib.TrimSpaceFunc,
+	"trimsuffix":             stdlib.TrimSuffixFunc,
+	"try":                    tryfunc.TryFunc,
+	"upper":                  stdlib.UpperFunc,
+	"urlencode":              encoding.URLEncodeFunc,
+	"uuidv4":                 uuid.V4Func,
+	"uuidv5":                 uuid.V5Func,
+	"values":                 stdlib.ValuesFunc,
+	"zipmap":                 stdlib.ZipmapFunc,
+}
+
+// timestampFunc constructs a function that returns a string representation of the current date and time.
+//
+// This function was imported from terraform's datetime utilities.
+var timestampFunc = function.New(&function.Spec{
+	Params: []function.Parameter{},
+	Type:   function.StaticReturnType(cty.String),
+	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+		return cty.StringVal(time.Now().UTC().Format(time.RFC3339)), nil
+	},
+})

bake/remote.go

@@ -0,0 +1,237 @@
+package bake
+
+import (
+	"archive/tar"
+	"bytes"
+	"context"
+	"strings"
+
+	"github.com/docker/buildx/build"
+	"github.com/docker/buildx/driver"
+	"github.com/docker/buildx/util/progress"
+	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/client/llb"
+	gwclient "github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/pkg/errors"
+)
+
+type Input struct {
+	State *llb.State
+	URL   string
+}
+
+func ReadRemoteFiles(ctx context.Context, dis []build.DriverInfo, url string, names []string, pw progress.Writer) ([]File, *Input, error) {
+	var filename string
+	st, ok := detectGitContext(url)
+	if !ok {
+		st, filename, ok = detectHTTPContext(url)
+		if !ok {
+			return nil, nil, errors.Errorf("not url context")
+		}
+	}
+
+	inp := &Input{State: st, URL: url}
+	var files []File
+
+	var di *build.DriverInfo
+	for _, d := range dis {
+		if d.Err == nil {
+			di = &d
+			continue
+		}
+	}
+	if di == nil {
+		return nil, nil, nil
+	}
+
+	c, err := driver.Boot(ctx, ctx, di.Driver, pw)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	ch, done := progress.NewChannel(pw)
+	defer func() { <-done }()
+	_, err = c.Build(ctx, client.SolveOpt{}, "buildx", func(ctx context.Context, c gwclient.Client) (*gwclient.Result, error) {
+		def, err := st.Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+		res, err := c.Solve(ctx, gwclient.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		ref, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+
+		if filename != "" {
+			files, err = filesFromURLRef(ctx, c, ref, inp, filename, names)
+		} else {
+			files, err = filesFromRef(ctx, ref, names)
+		}
+		return nil, err
+	}, ch)
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return files, inp, nil
+}
+
+func IsRemoteURL(url string) bool {
+	if _, _, ok := detectHTTPContext(url); ok {
+		return true
+	}
+	if _, ok := detectGitContext(url); ok {
+		return true
+	}
+	return false
+}
+
+func detectHTTPContext(url string) (*llb.State, string, bool) {
+	if httpPrefix.MatchString(url) {
+		httpContext := llb.HTTP(url, llb.Filename("context"), llb.WithCustomName("[internal] load remote build context"))
+		return &httpContext, "context", true
+	}
+	return nil, "", false
+}
+
+func detectGitContext(ref string) (*llb.State, bool) {
+	found := false
+	if httpPrefix.MatchString(ref) && gitURLPathWithFragmentSuffix.MatchString(ref) {
+		found = true
+	}
+
+	for _, prefix := range []string{"git://", "github.com/", "git@"} {
+		if strings.HasPrefix(ref, prefix) {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return nil, false
+	}
+
+	parts := strings.SplitN(ref, "#", 2)
+	branch := ""
+	if len(parts) > 1 {
+		branch = parts[1]
+	}
+	gitOpts := []llb.GitOption{llb.WithCustomName("[internal] load git source " + ref)}
+
+	st := llb.Git(parts[0], branch, gitOpts...)
+	return &st, true
+}
+
+func isArchive(header []byte) bool {
+	for _, m := range [][]byte{
+		{0x42, 0x5A, 0x68},                   // bzip2
+		{0x1F, 0x8B, 0x08},                   // gzip
+		{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, // xz
+	} {
+		if len(header) < len(m) {
+			continue
+		}
+		if bytes.Equal(m, header[:len(m)]) {
+			return true
+		}
+	}
+
+	r := tar.NewReader(bytes.NewBuffer(header))
+	_, err := r.Next()
+	return err == nil
+}
+
+func filesFromURLRef(ctx context.Context, c gwclient.Client, ref gwclient.Reference, inp *Input, filename string, names []string) ([]File, error) {
+	stat, err := ref.StatFile(ctx, gwclient.StatRequest{Path: filename})
+	if err != nil {
+		return nil, err
+	}
+
+	dt, err := ref.ReadFile(ctx, gwclient.ReadRequest{
+		Filename: filename,
+		Range: &gwclient.FileRange{
+			Length: 1024,
+		},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if isArchive(dt) {
+		bc := llb.Scratch().File(llb.Copy(inp.State, filename, "/", &llb.CopyInfo{
+			AttemptUnpack: true,
+		}))
+		inp.State = &bc
+		inp.URL = ""
+		def, err := bc.Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+		res, err := c.Solve(ctx, gwclient.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		ref, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+
+		return filesFromRef(ctx, ref, names)
+	}
+
+	inp.State = nil
+	name := inp.URL
+	inp.URL = ""
+
+	if len(dt) > stat.Size() {
+		if stat.Size() > 1024*512 {
+			return nil, errors.Errorf("non-archive definition URL bigger than maximum allowed size")
+		}
+
+		dt, err = ref.ReadFile(ctx, gwclient.ReadRequest{
+			Filename: filename,
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return []File{{Name: name, Data: dt}}, nil
+}
+
+func filesFromRef(ctx context.Context, ref gwclient.Reference, names []string) ([]File, error) {
+	// TODO: auto-remove parent dir in needed
+	var files []File
+
+	isDefault := false
+	if len(names) == 0 {
+		isDefault = true
+		names = defaultFilenames()
+	}
+
+	for _, name := range names {
+		_, err := ref.StatFile(ctx, gwclient.StatRequest{Path: name})
+		if err != nil {
+			if isDefault {
+				continue
+			}
+			return nil, err
+		}
+		dt, err := ref.ReadFile(ctx, gwclient.ReadRequest{Filename: name})
+		if err != nil {
+			return nil, err
+		}
+		files = append(files, File{Name: name, Data: dt})
+	}
+
+	return files, nil
+}

build/cache.go

@@ -1,60 +0,0 @@
-package build
-
-import (
-	"encoding/csv"
-	"strings"
-
-	"github.com/moby/buildkit/client"
-	"github.com/pkg/errors"
-)
-
-func ParseCacheEntry(in []string) ([]client.CacheOptionsEntry, error) {
-	imports := make([]client.CacheOptionsEntry, 0, len(in))
-	for _, in := range in {
-		csvReader := csv.NewReader(strings.NewReader(in))
-		fields, err := csvReader.Read()
-		if err != nil {
-			return nil, err
-		}
-		if isRefOnlyFormat(fields) {
-			for _, field := range fields {
-				imports = append(imports, client.CacheOptionsEntry{
-					Type:  "registry",
-					Attrs: map[string]string{"ref": field},
-				})
-			}
-			continue
-		}
-		im := client.CacheOptionsEntry{
-			Attrs: map[string]string{},
-		}
-		for _, field := range fields {
-			parts := strings.SplitN(field, "=", 2)
-			if len(parts) != 2 {
-				return nil, errors.Errorf("invalid value %s", field)
-			}
-			key := strings.ToLower(parts[0])
-			value := parts[1]
-			switch key {
-			case "type":
-				im.Type = value
-			default:
-				im.Attrs[key] = value
-			}
-		}
-		if im.Type == "" {
-			return nil, errors.Errorf("type required form> %q", in)
-		}
-		imports = append(imports, im)
-	}
-	return imports, nil
-}
-
-func isRefOnlyFormat(in []string) bool {
-	for _, v := range in {
-		if strings.Contains(v, "=") {
-			return false
-		}
-	}
-	return true
-}

build/secrets.go

@@ -1,60 +0,0 @@
-package build
-
-import (
-	"encoding/csv"
-	"strings"
-
-	"github.com/moby/buildkit/session"
-	"github.com/moby/buildkit/session/secrets/secretsprovider"
-	"github.com/pkg/errors"
-)
-
-func ParseSecretSpecs(sl []string) (session.Attachable, error) {
-	fs := make([]secretsprovider.FileSource, 0, len(sl))
-	for _, v := range sl {
-		s, err := parseSecret(v)
-		if err != nil {
-			return nil, err
-		}
-		fs = append(fs, *s)
-	}
-	store, err := secretsprovider.NewFileStore(fs)
-	if err != nil {
-		return nil, err
-	}
-	return secretsprovider.NewSecretProvider(store), nil
-}
-
-func parseSecret(value string) (*secretsprovider.FileSource, error) {
-	csvReader := csv.NewReader(strings.NewReader(value))
-	fields, err := csvReader.Read()
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to parse csv secret")
-	}
-
-	fs := secretsprovider.FileSource{}
-
-	for _, field := range fields {
-		parts := strings.SplitN(field, "=", 2)
-		key := strings.ToLower(parts[0])
-
-		if len(parts) != 2 {
-			return nil, errors.Errorf("invalid field '%s' must be a key=value pair", field)
-		}
-
-		value := parts[1]
-		switch key {
-		case "type":
-			if value != "file" {
-				return nil, errors.Errorf("unsupported secret type %q", value)
-			}
-		case "id":
-			fs.ID = value
-		case "source", "src":
-			fs.FilePath = value
-		default:
-			return nil, errors.Errorf("unexpected key '%s' in '%s'", key, field)
-		}
-	}
-	return &fs, nil
-}

build/ssh.go

@@ -1,31 +0,0 @@
-package build
-
-import (
-	"strings"
-
-	"github.com/moby/buildkit/session"
-	"github.com/moby/buildkit/session/sshforward/sshprovider"
-)
-
-func ParseSSHSpecs(sl []string) (session.Attachable, error) {
-	configs := make([]sshprovider.AgentConfig, 0, len(sl))
-	for _, v := range sl {
-		c, err := parseSSH(v)
-		if err != nil {
-			return nil, err
-		}
-		configs = append(configs, *c)
-	}
-	return sshprovider.NewSSHAgentProvider(configs)
-}
-
-func parseSSH(value string) (*sshprovider.AgentConfig, error) {
-	parts := strings.SplitN(value, "=", 2)
-	cfg := sshprovider.AgentConfig{
-		ID: parts[0],
-	}
-	if len(parts) > 1 {
-		cfg.Paths = strings.Split(parts[1], ",")
-	}
-	return &cfg, nil
-}

build/url.go

@@ -0,0 +1,71 @@
+package build
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+
+	"github.com/docker/buildx/driver"
+	"github.com/docker/buildx/util/progress"
+	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/client/llb"
+	gwclient "github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/pkg/errors"
+)
+
+func createTempDockerfileFromURL(ctx context.Context, d driver.Driver, url string, pw progress.Writer) (string, error) {
+	c, err := driver.Boot(ctx, ctx, d, pw)
+	if err != nil {
+		return "", err
+	}
+	var out string
+	ch, done := progress.NewChannel(pw)
+	defer func() { <-done }()
+	_, err = c.Build(ctx, client.SolveOpt{}, "buildx", func(ctx context.Context, c gwclient.Client) (*gwclient.Result, error) {
+		def, err := llb.HTTP(url, llb.Filename("Dockerfile"), llb.WithCustomNamef("[internal] load %s", url)).Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+
+		res, err := c.Solve(ctx, gwclient.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+		ref, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+		stat, err := ref.StatFile(ctx, gwclient.StatRequest{
+			Path: "Dockerfile",
+		})
+		if err != nil {
+			return nil, err
+		}
+		if stat.Size() > 512*1024 {
+			return nil, errors.Errorf("Dockerfile %s bigger than allowed max size", url)
+		}
+
+		dt, err := ref.ReadFile(ctx, gwclient.ReadRequest{
+			Filename: "Dockerfile",
+		})
+		if err != nil {
+			return nil, err
+		}
+		dir, err := os.MkdirTemp("", "buildx")
+		if err != nil {
+			return nil, err
+		}
+		if err := os.WriteFile(filepath.Join(dir, "Dockerfile"), dt, 0600); err != nil {
+			return nil, err
+		}
+		out = dir
+		return nil, nil
+	}, ch)
+
+	if err != nil {
+		return "", err
+	}
+	return out, nil
+}

build/utils.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/docker/cli/opts"
 	"github.com/pkg/errors"
 )
 
@@ -53,3 +54,15 @@ func toBuildkitExtraHosts(inp []string) (string, error) {
 	}
 	return strings.Join(hosts, ","), nil
 }
+
+// toBuildkitUlimits converts ulimits from docker type=soft:hard format to buildkit's csv format
+func toBuildkitUlimits(inp *opts.UlimitOpt) (string, error) {
+	if inp == nil || len(inp.GetList()) == 0 {
+		return "", nil
+	}
+	ulimits := make([]string, 0, len(inp.GetList()))
+	for _, ulimit := range inp.GetList() {
+		ulimits = append(ulimits, ulimit.String())
+	}
+	return strings.Join(ulimits, ","), nil
+}

cmd/buildx/main.go

@@ -4,15 +4,19 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/containerd/containerd/pkg/seed"
 	"github.com/docker/buildx/commands"
 	"github.com/docker/buildx/version"
+	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli-plugins/manager"
 	"github.com/docker/cli/cli-plugins/plugin"
 	"github.com/docker/cli/cli/command"
+	"github.com/docker/cli/cli/debug"
 	cliflags "github.com/docker/cli/cli/flags"
-	"github.com/spf13/cobra"
+	"github.com/moby/buildkit/solver/errdefs"
+	"github.com/moby/buildkit/util/stack"
 
-	// FIXME: "k8s.io/client-go/plugin/pkg/client/auth/azure" is excluded because of compilation error
+	_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/openstack"
@@ -20,35 +24,67 @@ import (
 	_ "github.com/docker/buildx/driver/docker"
 	_ "github.com/docker/buildx/driver/docker-container"
 	_ "github.com/docker/buildx/driver/kubernetes"
+	_ "github.com/docker/buildx/driver/remote"
 )
 
-var experimental string
+func init() {
+	seed.WithTimeAndRand()
+	stack.SetVersionInfo(version.Version, version.Revision)
+}
+
+func runStandalone(cmd *command.DockerCli) error {
+	if err := cmd.Initialize(cliflags.NewClientOptions()); err != nil {
+		return err
+	}
+	rootCmd := commands.NewRootCmd(os.Args[0], false, cmd)
+	return rootCmd.Execute()
+}
+
+func runPlugin(cmd *command.DockerCli) error {
+	rootCmd := commands.NewRootCmd("buildx", true, cmd)
+	return plugin.RunPlugin(cmd, rootCmd, manager.Metadata{
+		SchemaVersion: "0.1.0",
+		Vendor:        "Docker Inc.",
+		Version:       version.Version,
+	})
+}
 
 func main() {
-	if os.Getenv("DOCKER_CLI_PLUGIN_ORIGINAL_CLI_COMMAND") == "" {
-		if len(os.Args) < 2 || os.Args[1] != manager.MetadataSubcommandName {
-			dockerCli, err := command.NewDockerCli()
-			if err != nil {
-				fmt.Fprintln(os.Stderr, err)
-				os.Exit(1)
-			}
-			opts := cliflags.NewClientOptions()
-			dockerCli.Initialize(opts)
-			rootCmd := commands.NewRootCmd(os.Args[0], false, dockerCli)
-			if err := rootCmd.Execute(); err != nil {
-				os.Exit(1)
-			}
-			os.Exit(0)
-		}
+	cmd, err := command.NewDockerCli()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
 	}
 
-	plugin.Run(func(dockerCli command.Cli) *cobra.Command {
-		return commands.NewRootCmd("buildx", true, dockerCli)
-	},
-		manager.Metadata{
-			SchemaVersion: "0.1.0",
-			Vendor:        "Docker Inc.",
-			Version:       version.Version,
-			Experimental:  experimental != "",
-		})
+	if plugin.RunningStandalone() {
+		err = runStandalone(cmd)
+	} else {
+		err = runPlugin(cmd)
+	}
+	if err == nil {
+		return
+	}
+
+	if sterr, ok := err.(cli.StatusError); ok {
+		if sterr.Status != "" {
+			fmt.Fprintln(cmd.Err(), sterr.Status)
+		}
+		// StatusError should only be used for errors, and all errors should
+		// have a non-zero exit status, so never exit with 0
+		if sterr.StatusCode == 0 {
+			os.Exit(1)
+		}
+		os.Exit(sterr.StatusCode)
+	}
+
+	for _, s := range errdefs.Sources(err) {
+		s.Print(cmd.Err())
+	}
+	if debug.IsEnabled() {
+		fmt.Fprintf(cmd.Err(), "ERROR: %+v", stack.Formatter(err))
+	} else {
+		fmt.Fprintf(cmd.Err(), "ERROR: %v\n", err)
+	}
+
+	os.Exit(1)
 }

cmd/buildx/tracing.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"github.com/moby/buildkit/util/tracing/detect"
+	"go.opentelemetry.io/otel"
+
+	_ "github.com/moby/buildkit/util/tracing/detect/delegated"
+	_ "github.com/moby/buildkit/util/tracing/env"
+)
+
+func init() {
+	detect.ServiceName = "buildx"
+	// do not log tracing errors to stdio
+	otel.SetErrorHandler(skipErrors{})
+}
+
+type skipErrors struct{}
+
+func (skipErrors) Handle(err error) {}

codecov.yml

@@ -0,0 +1 @@
+comment: false

commands/bake.go

@@ -1,11 +1,17 @@
 package commands
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"os"
 
+	"github.com/containerd/containerd/platforms"
 	"github.com/docker/buildx/bake"
+	"github.com/docker/buildx/build"
+	"github.com/docker/buildx/util/confutil"
+	"github.com/docker/buildx/util/progress"
+	"github.com/docker/buildx/util/tracing"
 	"github.com/docker/cli/cli/command"
 	"github.com/moby/buildkit/util/appcontext"
 	"github.com/pkg/errors"
@@ -14,23 +20,36 @@ import (
 
 type bakeOptions struct {
 	files     []string
-	printOnly bool
 	overrides []string
+	printOnly bool
 	commonOptions
 }
 
-func runBake(dockerCli command.Cli, targets []string, in bakeOptions) error {
+func runBake(dockerCli command.Cli, targets []string, in bakeOptions) (err error) {
 	ctx := appcontext.Context()
 
-	if len(in.files) == 0 {
-		files, err := defaultFiles()
-		if err != nil {
-			return err
+	ctx, end, err := tracing.TraceCurrentCommand(ctx, "bake")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		end(err)
+	}()
+
+	var url string
+	cmdContext := "cwd://"
+
+	if len(targets) > 0 {
+		if bake.IsRemoteURL(targets[0]) {
+			url = targets[0]
+			targets = targets[1:]
+			if len(targets) > 0 {
+				if bake.IsRemoteURL(targets[0]) {
+					cmdContext = targets[0]
+					targets = targets[1:]
+				}
+			}
 		}
-		if len(files) == 0 {
-			return errors.Errorf("no docker-compose.yml or docker-bake.hcl found, specify build file with -f/--file")
-		}
-		in.files = files
 	}
 
 	if len(targets) == 0 {
@@ -42,7 +61,7 @@ func runBake(dockerCli command.Cli, targets []string, in bakeOptions) error {
 		if in.exportLoad {
 			return errors.Errorf("push and load may not be set together at the moment")
 		}
-		overrides = append(overrides, "*.output=type=registry")
+		overrides = append(overrides, "*.push=true")
 	} else if in.exportLoad {
 		overrides = append(overrides, "*.output=type=docker")
 	}
@@ -52,14 +71,73 @@ func runBake(dockerCli command.Cli, targets []string, in bakeOptions) error {
 	if in.pull != nil {
 		overrides = append(overrides, fmt.Sprintf("*.pull=%t", *in.pull))
 	}
+	contextPathHash, _ := os.Getwd()
 
-	m, err := bake.ReadTargets(ctx, in.files, targets, overrides)
+	ctx2, cancel := context.WithCancel(context.TODO())
+	defer cancel()
+	printer := progress.NewPrinter(ctx2, os.Stderr, os.Stderr, in.progress)
+
+	defer func() {
+		if printer != nil {
+			err1 := printer.Wait()
+			if err == nil {
+				err = err1
+			}
+		}
+	}()
+
+	dis, err := getInstanceOrDefault(ctx, dockerCli, in.builder, contextPathHash)
+	if err != nil {
+		return err
+	}
+
+	var files []bake.File
+	var inp *bake.Input
+
+	if url != "" {
+		files, inp, err = bake.ReadRemoteFiles(ctx, dis, url, in.files, printer)
+	} else {
+		files, err = bake.ReadLocalFiles(in.files)
+	}
+	if err != nil {
+		return err
+	}
+
+	tgts, grps, err := bake.ReadTargets(ctx, files, targets, overrides, map[string]string{
+		// don't forget to update documentation if you add a new
+		// built-in variable: docs/guides/bake/file-definition.md#built-in-variables
+		"BAKE_CMD_CONTEXT":    cmdContext,
+		"BAKE_LOCAL_PLATFORM": platforms.DefaultString(),
+	})
+	if err != nil {
+		return err
+	}
+
+	// this function can update target context string from the input so call before printOnly check
+	bo, err := bake.TargetsToBuildOpt(tgts, inp)
 	if err != nil {
 		return err
 	}
 
 	if in.printOnly {
-		dt, err := json.MarshalIndent(map[string]map[string]*bake.Target{"target": m}, "", "   ")
+		var defg map[string]*bake.Group
+		if len(grps) == 1 {
+			defg = map[string]*bake.Group{
+				"default": grps[0],
+			}
+		}
+		dt, err := json.MarshalIndent(struct {
+			Group  map[string]*bake.Group  `json:"group,omitempty"`
+			Target map[string]*bake.Target `json:"target"`
+		}{
+			defg,
+			tgts,
+		}, "", "  ")
+		if err != nil {
+			return err
+		}
+		err = printer.Wait()
+		printer = nil
 		if err != nil {
 			return err
 		}
@@ -67,36 +145,22 @@ func runBake(dockerCli command.Cli, targets []string, in bakeOptions) error {
 		return nil
 	}
 
-	bo, err := bake.TargetsToBuildOpt(m)
+	resp, err := build.Build(ctx, dis, bo, dockerAPI(dockerCli), confutil.ConfigDir(dockerCli), printer)
 	if err != nil {
-		return err
+		return wrapBuildError(err, true)
 	}
 
-	contextPathHash, _ := os.Getwd()
-
-	return buildTargets(ctx, dockerCli, bo, in.progress, contextPathHash, in.builder)
-}
-
-func defaultFiles() ([]string, error) {
-	fns := []string{
-		"docker-compose.yml",  // support app
-		"docker-compose.yaml", // support app
-		"docker-bake.json",
-		"docker-bake.override.json",
-		"docker-bake.hcl",
-		"docker-bake.override.hcl",
-	}
-	out := make([]string, 0, len(fns))
-	for _, f := range fns {
-		if _, err := os.Stat(f); err != nil {
-			if os.IsNotExist(errors.Cause(err)) {
-				continue
-			}
-			return nil, err
+	if len(in.metadataFile) > 0 {
+		dt := make(map[string]interface{})
+		for t, r := range resp {
+			dt[t] = decodeExporterResponse(r.ExporterResponse)
+		}
+		if err := writeMetadataFile(in.metadataFile, dt); err != nil {
+			return err
 		}
-		out = append(out, f)
 	}
-	return out, nil
+
+	return err
 }
 
 func bakeCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
@@ -107,6 +171,14 @@ func bakeCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 		Aliases: []string{"f"},
 		Short:   "Build from a file",
 		RunE: func(cmd *cobra.Command, args []string) error {
+			// reset to nil to avoid override is unset
+			if !cmd.Flags().Lookup("no-cache").Changed {
+				options.noCache = nil
+			}
+			if !cmd.Flags().Lookup("pull").Changed {
+				options.pull = nil
+			}
+			options.commonOptions.builder = rootOpts.builder
 			return runBake(dockerCli, args, options)
 		},
 	}
@@ -114,10 +186,10 @@ func bakeCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	flags := cmd.Flags()
 
 	flags.StringArrayVarP(&options.files, "file", "f", []string{}, "Build definition file")
+	flags.BoolVar(&options.exportLoad, "load", false, `Shorthand for "--set=*.output=type=docker"`)
 	flags.BoolVar(&options.printOnly, "print", false, "Print the options without building")
-	flags.StringArrayVar(&options.overrides, "set", nil, "Override target value (eg: targetpattern.key=value)")
-	flags.BoolVar(&options.exportPush, "push", false, "Shorthand for --set=*.output=type=registry")
-	flags.BoolVar(&options.exportLoad, "load", false, "Shorthand for --set=*.output=type=docker")
+	flags.BoolVar(&options.exportPush, "push", false, `Shorthand for "--set=*.output=type=registry"`)
+	flags.StringArrayVar(&options.overrides, "set", nil, `Override target value (e.g., "targetpattern.key=value")`)
 
 	commonBuildFlags(&options.commonOptions, flags)
 

commands/build.go

@@ -1,86 +1,104 @@
 package commands
 
 import (
+	"bytes"
 	"context"
+	"encoding/base64"
+	"encoding/csv"
+	"encoding/json"
+	"fmt"
+	"io"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
+	"sync"
 
+	"github.com/containerd/console"
 	"github.com/docker/buildx/build"
-	"github.com/docker/buildx/util/flagutil"
+	"github.com/docker/buildx/monitor"
+	"github.com/docker/buildx/util/buildflags"
+	"github.com/docker/buildx/util/confutil"
 	"github.com/docker/buildx/util/platformutil"
 	"github.com/docker/buildx/util/progress"
+	"github.com/docker/buildx/util/tracing"
+	"github.com/docker/cli-docs-tool/annotation"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
+	"github.com/docker/cli/cli/config"
+	dockeropts "github.com/docker/cli/opts"
+	"github.com/docker/distribution/reference"
+	"github.com/docker/docker/pkg/ioutils"
+	"github.com/docker/go-units"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/session/auth/authprovider"
+	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/util/appcontext"
+	"github.com/moby/buildkit/util/grpcerrors"
+	"github.com/morikuni/aec"
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
+	"google.golang.org/grpc/codes"
 )
 
+const defaultTargetName = "default"
+
 type buildOptions struct {
-	commonOptions
 	contextPath    string
 	dockerfileName string
-	tags           []string
-	labels         []string
-	buildArgs      []string
+	printFunc      string
 
-	cacheFrom   []string
-	cacheTo     []string
-	target      string
-	platforms   []string
-	secrets     []string
-	ssh         []string
-	outputs     []string
-	imageIDFile string
-	extraHosts  []string
-	networkMode string
-
-	// unimplemented
-	squash bool
-	quiet  bool
-
-	allow []string
-
-	// hidden
-	// untrusted   bool
-	// ulimits        *opts.UlimitOpt
-	// memory         opts.MemBytes
-	// memorySwap     opts.MemSwapBytes
-	// shmSize        opts.MemBytes
-	// cpuShares      int64
-	// cpuPeriod      int64
-	// cpuQuota       int64
-	// cpuSetCpus     string
-	// cpuSetMems     string
-	// cgroupParent   string
-	// isolation      string
-	// compress    bool
-	// securityOpt []string
+	allow         []string
+	buildArgs     []string
+	cacheFrom     []string
+	cacheTo       []string
+	cgroupParent  string
+	contexts      []string
+	extraHosts    []string
+	imageIDFile   string
+	labels        []string
+	networkMode   string
+	noCacheFilter []string
+	outputs       []string
+	platforms     []string
+	quiet         bool
+	secrets       []string
+	shmSize       dockeropts.MemBytes
+	ssh           []string
+	tags          []string
+	target        string
+	ulimits       *dockeropts.UlimitOpt
+	invoke        string
+	commonOptions
 }
 
 type commonOptions struct {
-	builder    string
-	noCache    *bool
-	progress   string
-	pull       *bool
+	builder      string
+	metadataFile string
+	noCache      *bool
+	progress     string
+	pull         *bool
+
+	// golangci-lint#826
+	// nolint:structcheck
 	exportPush bool
+	// nolint:structcheck
 	exportLoad bool
 }
 
-func runBuild(dockerCli command.Cli, in buildOptions) error {
-	if in.squash {
-		return errors.Errorf("squash currently not implemented")
-	}
-	if in.quiet {
-		return errors.Errorf("quiet currently not implemented")
-	}
-
+func runBuild(dockerCli command.Cli, in buildOptions) (err error) {
 	ctx := appcontext.Context()
 
+	ctx, end, err := tracing.TraceCurrentCommand(ctx, "build")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		end(err)
+	}()
+
 	noCache := false
 	if in.noCache != nil {
 		noCache = *in.noCache
@@ -90,21 +108,46 @@ func runBuild(dockerCli command.Cli, in buildOptions) error {
 		pull = *in.pull
 	}
 
+	if noCache && len(in.noCacheFilter) > 0 {
+		return errors.Errorf("--no-cache and --no-cache-filter cannot currently be used together")
+	}
+
+	if in.quiet && in.progress != "auto" && in.progress != "quiet" {
+		return errors.Errorf("progress=%s and quiet cannot be used together", in.progress)
+	} else if in.quiet {
+		in.progress = "quiet"
+	}
+
+	contexts, err := parseContextNames(in.contexts)
+	if err != nil {
+		return err
+	}
+
+	printFunc, err := parsePrintFunc(in.printFunc)
+	if err != nil {
+		return err
+	}
+
 	opts := build.Options{
 		Inputs: build.Inputs{
 			ContextPath:    in.contextPath,
 			DockerfilePath: in.dockerfileName,
 			InStream:       os.Stdin,
+			NamedContexts:  contexts,
 		},
-		Tags:        in.tags,
-		Labels:      listToMap(in.labels, false),
-		BuildArgs:   listToMap(in.buildArgs, true),
-		Pull:        pull,
-		NoCache:     noCache,
-		Target:      in.target,
-		ImageIDFile: in.imageIDFile,
-		ExtraHosts:  in.extraHosts,
-		NetworkMode: in.networkMode,
+		BuildArgs:     listToMap(in.buildArgs, true),
+		ExtraHosts:    in.extraHosts,
+		ImageIDFile:   in.imageIDFile,
+		Labels:        listToMap(in.labels, false),
+		NetworkMode:   in.networkMode,
+		NoCache:       noCache,
+		NoCacheFilter: in.noCacheFilter,
+		Pull:          pull,
+		ShmSize:       in.shmSize,
+		Tags:          in.tags,
+		Target:        in.target,
+		Ulimits:       in.ulimits,
+		PrintFunc:     printFunc,
 	}
 
 	platforms, err := platformutil.Parse(in.platforms)
@@ -113,21 +156,26 @@ func runBuild(dockerCli command.Cli, in buildOptions) error {
 	}
 	opts.Platforms = platforms
 
-	opts.Session = append(opts.Session, authprovider.NewDockerAuthProvider(os.Stderr))
+	dockerConfig := config.LoadDefaultConfigFile(os.Stderr)
+	opts.Session = append(opts.Session, authprovider.NewDockerAuthProvider(dockerConfig))
 
-	secrets, err := build.ParseSecretSpecs(in.secrets)
+	secrets, err := buildflags.ParseSecretSpecs(in.secrets)
 	if err != nil {
 		return err
 	}
 	opts.Session = append(opts.Session, secrets)
 
-	ssh, err := build.ParseSSHSpecs(in.ssh)
+	sshSpecs := in.ssh
+	if len(sshSpecs) == 0 && buildflags.IsGitSSH(in.contextPath) {
+		sshSpecs = []string{"default"}
+	}
+	ssh, err := buildflags.ParseSSHSpecs(sshSpecs)
 	if err != nil {
 		return err
 	}
 	opts.Session = append(opts.Session, ssh)
 
-	outputs, err := build.ParseOutputs(in.outputs)
+	outputs, err := buildflags.ParseOutputs(in.outputs)
 	if err != nil {
 		return err
 	}
@@ -168,19 +216,19 @@ func runBuild(dockerCli command.Cli, in buildOptions) error {
 
 	opts.Exports = outputs
 
-	cacheImports, err := build.ParseCacheEntry(in.cacheFrom)
+	cacheImports, err := buildflags.ParseCacheEntry(in.cacheFrom)
 	if err != nil {
 		return err
 	}
 	opts.CacheFrom = cacheImports
 
-	cacheExports, err := build.ParseCacheEntry(in.cacheTo)
+	cacheExports, err := buildflags.ParseCacheEntry(in.cacheTo)
 	if err != nil {
 		return err
 	}
 	opts.CacheTo = cacheExports
 
-	allow, err := build.ParseEntitlements(in.allow)
+	allow, err := buildflags.ParseEntitlements(in.allow)
 	if err != nil {
 		return err
 	}
@@ -192,25 +240,190 @@ func runBuild(dockerCli command.Cli, in buildOptions) error {
 		contextPathHash = in.contextPath
 	}
 
-	return buildTargets(ctx, dockerCli, map[string]build.Options{"default": opts}, in.progress, contextPathHash, in.builder)
-}
-
-func buildTargets(ctx context.Context, dockerCli command.Cli, opts map[string]build.Options, progressMode, contextPathHash, instance string) error {
-	dis, err := getInstanceOrDefault(ctx, dockerCli, instance, contextPathHash)
+	imageID, res, err := buildTargets(ctx, dockerCli, map[string]build.Options{defaultTargetName: opts}, in.progress, contextPathHash, in.builder, in.metadataFile, in.invoke != "")
+	err = wrapBuildError(err, false)
 	if err != nil {
 		return err
 	}
 
+	if in.invoke != "" {
+		cfg, err := parseInvokeConfig(in.invoke)
+		if err != nil {
+			return err
+		}
+		cfg.ResultCtx = res
+		con := console.Current()
+		if err := con.SetRaw(); err != nil {
+			return errors.Errorf("failed to configure terminal: %v", err)
+		}
+		err = monitor.RunMonitor(ctx, cfg, func(ctx context.Context) (*build.ResultContext, error) {
+			_, rr, err := buildTargets(ctx, dockerCli, map[string]build.Options{defaultTargetName: opts}, in.progress, contextPathHash, in.builder, in.metadataFile, true)
+			return rr, err
+		}, io.NopCloser(os.Stdin), nopCloser{os.Stdout}, nopCloser{os.Stderr})
+		if err != nil {
+			logrus.Warnf("failed to run monitor: %v", err)
+		}
+		con.Reset()
+	}
+
+	if in.quiet {
+		fmt.Println(imageID)
+	}
+	return nil
+}
+
+type nopCloser struct {
+	io.WriteCloser
+}
+
+func (c nopCloser) Close() error { return nil }
+
+func buildTargets(ctx context.Context, dockerCli command.Cli, opts map[string]build.Options, progressMode, contextPathHash, instance string, metadataFile string, allowNoOutput bool) (imageID string, res *build.ResultContext, err error) {
+	dis, err := getInstanceOrDefault(ctx, dockerCli, instance, contextPathHash)
+	if err != nil {
+		return "", nil, err
+	}
+
 	ctx2, cancel := context.WithCancel(context.TODO())
 	defer cancel()
-	pw := progress.NewPrinter(ctx2, os.Stderr, progressMode)
 
-	_, err = build.Build(ctx, dis, opts, dockerAPI(dockerCli), dockerCli.ConfigFile(), pw)
-	return err
+	printer := progress.NewPrinter(ctx2, os.Stderr, os.Stderr, progressMode)
+
+	var mu sync.Mutex
+	var idx int
+	resp, err := build.BuildWithResultHandler(ctx, dis, opts, dockerAPI(dockerCli), confutil.ConfigDir(dockerCli), printer, func(driverIndex int, gotRes *build.ResultContext) {
+		mu.Lock()
+		defer mu.Unlock()
+		if res == nil || driverIndex < idx {
+			idx, res = driverIndex, gotRes
+		}
+	}, allowNoOutput)
+	err1 := printer.Wait()
+	if err == nil {
+		err = err1
+	}
+	if err != nil {
+		return "", nil, err
+	}
+
+	if len(metadataFile) > 0 && resp != nil {
+		if err := writeMetadataFile(metadataFile, decodeExporterResponse(resp[defaultTargetName].ExporterResponse)); err != nil {
+			return "", nil, err
+		}
+	}
+
+	printWarnings(os.Stderr, printer.Warnings(), progressMode)
+
+	for k := range resp {
+		if opts[k].PrintFunc != nil {
+			if err := printResult(opts[k].PrintFunc, resp[k].ExporterResponse); err != nil {
+				return "", nil, err
+			}
+		}
+	}
+
+	return resp[defaultTargetName].ExporterResponse["containerimage.digest"], res, err
+}
+
+func parseInvokeConfig(invoke string) (cfg build.ContainerConfig, err error) {
+	csvReader := csv.NewReader(strings.NewReader(invoke))
+	fields, err := csvReader.Read()
+	if err != nil {
+		return cfg, err
+	}
+	cfg.Tty = true
+	if len(fields) == 1 && !strings.Contains(fields[0], "=") {
+		cfg.Args = []string{fields[0]}
+		return cfg, nil
+	}
+	var entrypoint string
+	var args []string
+	for _, field := range fields {
+		parts := strings.SplitN(field, "=", 2)
+		if len(parts) != 2 {
+			return cfg, errors.Errorf("invalid value %s", field)
+		}
+		key := strings.ToLower(parts[0])
+		value := parts[1]
+		switch key {
+		case "args":
+			args = append(args, value) // TODO: support JSON
+		case "entrypoint":
+			entrypoint = value // TODO: support JSON
+		case "env":
+			cfg.Env = append(cfg.Env, value)
+		case "user":
+			cfg.User = value
+		case "cwd":
+			cfg.Cwd = value
+		case "tty":
+			cfg.Tty, err = strconv.ParseBool(value)
+			if err != nil {
+				return cfg, errors.Errorf("failed to parse tty: %v", err)
+			}
+		default:
+			return cfg, errors.Errorf("unknown key %q", key)
+		}
+	}
+	cfg.Args = args
+	if entrypoint != "" {
+		cfg.Args = append([]string{entrypoint}, cfg.Args...)
+	}
+	if len(cfg.Args) == 0 {
+		cfg.Args = []string{"sh"}
+	}
+	return cfg, nil
+}
+
+func printWarnings(w io.Writer, warnings []client.VertexWarning, mode string) {
+	if len(warnings) == 0 || mode == progress.PrinterModeQuiet {
+		return
+	}
+	fmt.Fprintf(w, "\n ")
+	sb := &bytes.Buffer{}
+	if len(warnings) == 1 {
+		fmt.Fprintf(sb, "1 warning found")
+	} else {
+		fmt.Fprintf(sb, "%d warnings found", len(warnings))
+	}
+	if logrus.GetLevel() < logrus.DebugLevel {
+		fmt.Fprintf(sb, " (use --debug to expand)")
+	}
+	fmt.Fprintf(sb, ":\n")
+	fmt.Fprint(w, aec.Apply(sb.String(), aec.YellowF))
+
+	for _, warn := range warnings {
+		fmt.Fprintf(w, " - %s\n", warn.Short)
+		if logrus.GetLevel() < logrus.DebugLevel {
+			continue
+		}
+		for _, d := range warn.Detail {
+			fmt.Fprintf(w, "%s\n", d)
+		}
+		if warn.URL != "" {
+			fmt.Fprintf(w, "More info: %s\n", warn.URL)
+		}
+		if warn.SourceInfo != nil && warn.Range != nil {
+			src := errdefs.Source{
+				Info:   warn.SourceInfo,
+				Ranges: warn.Range,
+			}
+			src.Print(w)
+		}
+		fmt.Fprintf(w, "\n")
+
+	}
+}
+
+func newBuildOptions() buildOptions {
+	ulimits := make(map[string]*units.Ulimit)
+	return buildOptions{
+		ulimits: dockeropts.NewUlimitOpt(&ulimits),
+	}
 }
 
 func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
-	var options buildOptions
+	options := newBuildOptions()
 
 	cmd := &cobra.Command{
 		Use:     "build [OPTIONS] PATH | URL | -",
@@ -220,94 +433,146 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			options.contextPath = args[0]
 			options.builder = rootOpts.builder
+			cmd.Flags().VisitAll(checkWarnedFlags)
 			return runBuild(dockerCli, options)
 		},
 	}
 
+	var platformsDefault []string
+	if v := os.Getenv("DOCKER_DEFAULT_PLATFORM"); v != "" {
+		platformsDefault = []string{v}
+	}
+
 	flags := cmd.Flags()
 
-	flags.BoolVar(&options.exportPush, "push", false, "Shorthand for --output=type=registry")
-	flags.BoolVar(&options.exportLoad, "load", false, "Shorthand for --output=type=docker")
+	flags.StringSliceVar(&options.extraHosts, "add-host", []string{}, `Add a custom host-to-IP mapping (format: "host:ip")`)
+	flags.SetAnnotation("add-host", annotation.ExternalURL, []string{"https://docs.docker.com/engine/reference/commandline/build/#add-entries-to-container-hosts-file---add-host"})
+
+	flags.StringSliceVar(&options.allow, "allow", []string{}, `Allow extra privileged entitlement (e.g., "network.host", "security.insecure")`)
 
-	flags.StringArrayVarP(&options.tags, "tag", "t", []string{}, "Name and optionally a tag in the 'name:tag' format")
 	flags.StringArrayVar(&options.buildArgs, "build-arg", []string{}, "Set build-time variables")
-	flags.StringVarP(&options.dockerfileName, "file", "f", "", "Name of the Dockerfile (Default is 'PATH/Dockerfile')")
+
+	flags.StringArrayVar(&options.cacheFrom, "cache-from", []string{}, `External cache sources (e.g., "user/app:cache", "type=local,src=path/to/dir")`)
+
+	flags.StringArrayVar(&options.cacheTo, "cache-to", []string{}, `Cache export destinations (e.g., "user/app:cache", "type=local,dest=path/to/dir")`)
+
+	flags.StringVar(&options.cgroupParent, "cgroup-parent", "", "Optional parent cgroup for the container")
+	flags.SetAnnotation("cgroup-parent", annotation.ExternalURL, []string{"https://docs.docker.com/engine/reference/commandline/build/#use-a-custom-parent-cgroup---cgroup-parent"})
+
+	flags.StringArrayVar(&options.contexts, "build-context", []string{}, "Additional build contexts (e.g., name=path)")
+
+	flags.StringVarP(&options.dockerfileName, "file", "f", "", `Name of the Dockerfile (default: "PATH/Dockerfile")`)
+	flags.SetAnnotation("file", annotation.ExternalURL, []string{"https://docs.docker.com/engine/reference/commandline/build/#specify-a-dockerfile--f"})
+
+	flags.StringVar(&options.imageIDFile, "iidfile", "", "Write the image ID to the file")
 
 	flags.StringArrayVar(&options.labels, "label", []string{}, "Set metadata for an image")
 
-	flags.StringArrayVar(&options.cacheFrom, "cache-from", []string{}, "External cache sources (eg. user/app:cache, type=local,src=path/to/dir)")
-	flags.StringArrayVar(&options.cacheTo, "cache-to", []string{}, "Cache export destinations (eg. user/app:cache, type=local,dest=path/to/dir)")
+	flags.BoolVar(&options.exportLoad, "load", false, `Shorthand for "--output=type=docker"`)
 
-	flags.StringVar(&options.target, "target", "", "Set the target build stage to build.")
+	flags.StringVar(&options.networkMode, "network", "default", `Set the networking mode for the "RUN" instructions during build`)
 
-	flags.StringSliceVar(&options.allow, "allow", []string{}, "Allow extra privileged entitlement, e.g. network.host, security.insecure")
+	flags.StringArrayVar(&options.noCacheFilter, "no-cache-filter", []string{}, "Do not cache specified stages")
+
+	flags.StringArrayVarP(&options.outputs, "output", "o", []string{}, `Output destination (format: "type=local,dest=path")`)
+
+	flags.StringArrayVar(&options.platforms, "platform", platformsDefault, "Set target platform for build")
+
+	if isExperimental() {
+		flags.StringVar(&options.printFunc, "print", "", "Print result of information request (outline, targets)")
+	}
+
+	flags.BoolVar(&options.exportPush, "push", false, `Shorthand for "--output=type=registry"`)
 
-	// not implemented
 	flags.BoolVarP(&options.quiet, "quiet", "q", false, "Suppress the build output and print image ID on success")
-	flags.StringVar(&options.networkMode, "network", "default", "Set the networking mode for the RUN instructions during build")
-	flags.StringSliceVar(&options.extraHosts, "add-host", []string{}, "Add a custom host-to-IP mapping (host:ip)")
-	flags.StringVar(&options.imageIDFile, "iidfile", "", "Write the image ID to the file")
-	flags.BoolVar(&options.squash, "squash", false, "Squash newly built layers into a single new layer")
-	flags.MarkHidden("quiet")
-	flags.MarkHidden("squash")
+
+	flags.StringArrayVar(&options.secrets, "secret", []string{}, `Secret to expose to the build (format: "id=mysecret[,src=/local/secret]")`)
+
+	flags.Var(&options.shmSize, "shm-size", `Size of "/dev/shm"`)
+
+	flags.StringArrayVar(&options.ssh, "ssh", []string{}, `SSH agent socket or keys to expose to the build (format: "default|<id>[=<socket>|<key>[,<key>]]")`)
+
+	flags.StringArrayVarP(&options.tags, "tag", "t", []string{}, `Name and optionally a tag (format: "name:tag")`)
+	flags.SetAnnotation("tag", annotation.ExternalURL, []string{"https://docs.docker.com/engine/reference/commandline/build/#tag-an-image--t"})
+
+	flags.StringVar(&options.target, "target", "", "Set the target build stage to build")
+	flags.SetAnnotation("target", annotation.ExternalURL, []string{"https://docs.docker.com/engine/reference/commandline/build/#specifying-target-build-stage---target"})
+
+	flags.Var(options.ulimits, "ulimit", "Ulimit options")
+
+	if isExperimental() {
+		flags.StringVar(&options.invoke, "invoke", "", "Invoke a command after the build. BUILDX_EXPERIMENTAL=1 is required.")
+	}
 
 	// hidden flags
 	var ignore string
 	var ignoreSlice []string
 	var ignoreBool bool
 	var ignoreInt int64
-	flags.StringVar(&ignore, "ulimit", "", "Ulimit options")
-	flags.MarkHidden("ulimit")
-	flags.StringSliceVar(&ignoreSlice, "security-opt", []string{}, "Security options")
-	flags.MarkHidden("security-opt")
+
 	flags.BoolVar(&ignoreBool, "compress", false, "Compress the build context using gzip")
 	flags.MarkHidden("compress")
-	flags.StringVarP(&ignore, "memory", "m", "", "Memory limit")
-	flags.MarkHidden("memory")
-	flags.StringVar(&ignore, "memory-swap", "", "Swap limit equal to memory plus swap: '-1' to enable unlimited swap")
-	flags.MarkHidden("memory-swap")
-	flags.StringVar(&ignore, "shm-size", "", "Size of /dev/shm")
-	flags.MarkHidden("shm-size")
-	flags.Int64VarP(&ignoreInt, "cpu-shares", "c", 0, "CPU shares (relative weight)")
-	flags.MarkHidden("cpu-shares")
-	flags.Int64Var(&ignoreInt, "cpu-period", 0, "Limit the CPU CFS (Completely Fair Scheduler) period")
-	flags.MarkHidden("cpu-period")
-	flags.Int64Var(&ignoreInt, "cpu-quota", 0, "Limit the CPU CFS (Completely Fair Scheduler) quota")
-	flags.MarkHidden("cpu-quota")
-	flags.StringVar(&ignore, "cpuset-cpus", "", "CPUs in which to allow execution (0-3, 0,1)")
-	flags.MarkHidden("cpuset-cpus")
-	flags.StringVar(&ignore, "cpuset-mems", "", "MEMs in which to allow execution (0-3, 0,1)")
-	flags.MarkHidden("cpuset-mems")
-	flags.StringVar(&ignore, "cgroup-parent", "", "Optional parent cgroup for the container")
-	flags.MarkHidden("cgroup-parent")
+
 	flags.StringVar(&ignore, "isolation", "", "Container isolation technology")
 	flags.MarkHidden("isolation")
+	flags.SetAnnotation("isolation", "flag-warn", []string{"isolation flag is deprecated with BuildKit."})
+
+	flags.StringSliceVar(&ignoreSlice, "security-opt", []string{}, "Security options")
+	flags.MarkHidden("security-opt")
+	flags.SetAnnotation("security-opt", "flag-warn", []string{`security-opt flag is deprecated. "RUN --security=insecure" should be used with BuildKit.`})
+
+	flags.BoolVar(&ignoreBool, "squash", false, "Squash newly built layers into a single new layer")
+	flags.MarkHidden("squash")
+	flags.SetAnnotation("squash", "flag-warn", []string{"experimental flag squash is removed with BuildKit. You should squash inside build using a multi-stage Dockerfile for efficiency."})
+
+	flags.StringVarP(&ignore, "memory", "m", "", "Memory limit")
+	flags.MarkHidden("memory")
+
+	flags.StringVar(&ignore, "memory-swap", "", `Swap limit equal to memory plus swap: "-1" to enable unlimited swap`)
+	flags.MarkHidden("memory-swap")
+
+	flags.Int64VarP(&ignoreInt, "cpu-shares", "c", 0, "CPU shares (relative weight)")
+	flags.MarkHidden("cpu-shares")
+
+	flags.Int64Var(&ignoreInt, "cpu-period", 0, "Limit the CPU CFS (Completely Fair Scheduler) period")
+	flags.MarkHidden("cpu-period")
+
+	flags.Int64Var(&ignoreInt, "cpu-quota", 0, "Limit the CPU CFS (Completely Fair Scheduler) quota")
+	flags.MarkHidden("cpu-quota")
+
+	flags.StringVar(&ignore, "cpuset-cpus", "", `CPUs in which to allow execution ("0-3", "0,1")`)
+	flags.MarkHidden("cpuset-cpus")
+
+	flags.StringVar(&ignore, "cpuset-mems", "", `MEMs in which to allow execution ("0-3", "0,1")`)
+	flags.MarkHidden("cpuset-mems")
+
 	flags.BoolVar(&ignoreBool, "rm", true, "Remove intermediate containers after a successful build")
 	flags.MarkHidden("rm")
+
 	flags.BoolVar(&ignoreBool, "force-rm", false, "Always remove intermediate containers")
 	flags.MarkHidden("force-rm")
 
-	platformsDefault := []string{}
-	if v := os.Getenv("DOCKER_DEFAULT_PLATFORM"); v != "" {
-		platformsDefault = []string{v}
-	}
-	flags.StringArrayVar(&options.platforms, "platform", platformsDefault, "Set target platform for build")
-
-	flags.StringArrayVar(&options.secrets, "secret", []string{}, "Secret file to expose to the build: id=mysecret,src=/local/secret")
-
-	flags.StringArrayVar(&options.ssh, "ssh", []string{}, "SSH agent socket or keys to expose to the build (format: default|<id>[=<socket>|<key>[,<key>]])")
-
-	flags.StringArrayVarP(&options.outputs, "output", "o", []string{}, "Output destination (format: type=local,dest=path)")
-
 	commonBuildFlags(&options.commonOptions, flags)
-
 	return cmd
 }
 
 func commonBuildFlags(options *commonOptions, flags *pflag.FlagSet) {
-	flags.Var(flagutil.Tristate(options.noCache), "no-cache", "Do not use cache when building the image")
-	flags.StringVar(&options.progress, "progress", "auto", "Set type of progress output (auto, plain, tty). Use plain to show container output")
-	flags.Var(flagutil.Tristate(options.pull), "pull", "Always attempt to pull a newer version of the image")
+	options.noCache = flags.Bool("no-cache", false, "Do not use cache when building the image")
+	flags.StringVar(&options.progress, "progress", "auto", `Set type of progress output ("auto", "plain", "tty"). Use plain to show container output`)
+	options.pull = flags.Bool("pull", false, "Always attempt to pull all referenced images")
+	flags.StringVar(&options.metadataFile, "metadata-file", "", "Write build result metadata to the file")
+}
+
+func checkWarnedFlags(f *pflag.Flag) {
+	if !f.Changed {
+		return
+	}
+	for t, m := range f.Annotations {
+		switch t {
+		case "flag-warn":
+			logrus.Warn(m[0])
+		}
+	}
 }
 
 func listToMap(values []string, defaultEnv bool) map[string]string {
@@ -329,3 +594,116 @@ func listToMap(values []string, defaultEnv bool) map[string]string {
 	}
 	return result
 }
+
+func parseContextNames(values []string) (map[string]build.NamedContext, error) {
+	if len(values) == 0 {
+		return nil, nil
+	}
+	result := make(map[string]build.NamedContext, len(values))
+	for _, value := range values {
+		kv := strings.SplitN(value, "=", 2)
+		if len(kv) != 2 {
+			return nil, errors.Errorf("invalid context value: %s, expected key=value", value)
+		}
+		named, err := reference.ParseNormalizedNamed(kv[0])
+		if err != nil {
+			return nil, errors.Wrapf(err, "invalid context name %s", kv[0])
+		}
+		name := strings.TrimSuffix(reference.FamiliarString(named), ":latest")
+		result[name] = build.NamedContext{Path: kv[1]}
+	}
+	return result, nil
+}
+
+func parsePrintFunc(str string) (*build.PrintFunc, error) {
+	if str == "" {
+		return nil, nil
+	}
+	csvReader := csv.NewReader(strings.NewReader(str))
+	fields, err := csvReader.Read()
+	if err != nil {
+		return nil, err
+	}
+	f := &build.PrintFunc{}
+	for _, field := range fields {
+		parts := strings.SplitN(field, "=", 2)
+		if len(parts) == 2 {
+			if parts[0] == "format" {
+				f.Format = parts[1]
+			} else {
+				return nil, errors.Errorf("invalid print field: %s", field)
+			}
+		} else {
+			if f.Name != "" {
+				return nil, errors.Errorf("invalid print value: %s", str)
+			}
+			f.Name = field
+		}
+	}
+	return f, nil
+}
+
+func writeMetadataFile(filename string, dt interface{}) error {
+	b, err := json.MarshalIndent(dt, "", "  ")
+	if err != nil {
+		return err
+	}
+	return ioutils.AtomicWriteFile(filename, b, 0644)
+}
+
+func decodeExporterResponse(exporterResponse map[string]string) map[string]interface{} {
+	out := make(map[string]interface{})
+	for k, v := range exporterResponse {
+		dt, err := base64.StdEncoding.DecodeString(v)
+		if err != nil {
+			out[k] = v
+			continue
+		}
+		var raw map[string]interface{}
+		if err = json.Unmarshal(dt, &raw); err != nil || len(raw) == 0 {
+			out[k] = v
+			continue
+		}
+		out[k] = json.RawMessage(dt)
+	}
+	return out
+}
+
+func wrapBuildError(err error, bake bool) error {
+	if err == nil {
+		return nil
+	}
+	st, ok := grpcerrors.AsGRPCStatus(err)
+	if ok {
+		if st.Code() == codes.Unimplemented && strings.Contains(st.Message(), "unsupported frontend capability moby.buildkit.frontend.contexts") {
+			msg := "current frontend does not support --build-context."
+			if bake {
+				msg = "current frontend does not support defining additional contexts for targets."
+			}
+			msg += " Named contexts are supported since Dockerfile v1.4. Use #syntax directive in Dockerfile or update to latest BuildKit."
+			return &wrapped{err, msg}
+		}
+	}
+	return err
+}
+
+type wrapped struct {
+	err error
+	msg string
+}
+
+func (w *wrapped) Error() string {
+	return w.msg
+}
+
+func (w *wrapped) Unwrap() error {
+	return w.err
+}
+
+func isExperimental() bool {
+	if v, ok := os.LookupEnv("BUILDKIT_EXPERIMENTAL"); ok {
+		vv, _ := strconv.ParseBool(v)
+		return vv
+	}
+	return false
+}

commands/create.go

@@ -1,13 +1,20 @@
 package commands
 
 import (
+	"bytes"
+	"context"
 	"encoding/csv"
 	"fmt"
+	"net/url"
 	"os"
 	"strings"
+	"time"
 
 	"github.com/docker/buildx/driver"
 	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
+	"github.com/docker/buildx/util/cobrautil"
+	"github.com/docker/buildx/util/confutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/google/shlex"
@@ -28,6 +35,7 @@ type createOptions struct {
 	flags        string
 	configFile   string
 	driverOpts   []string
+	bootstrap    bool
 	// upgrade      bool // perform upgrade of the driver
 }
 
@@ -53,23 +61,7 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 		}
 	}
 
-	driverName := in.driver
-	if driverName == "" {
-		f, err := driver.GetDefaultFactory(ctx, dockerCli.Client(), true)
-		if err != nil {
-			return err
-		}
-		if f == nil {
-			return errors.Errorf("no valid drivers found")
-		}
-		driverName = f.Name()
-	}
-
-	if driver.GetFactory(driverName, true) == nil {
-		return errors.Errorf("failed to find driver %q", in.driver)
-	}
-
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
@@ -83,6 +75,19 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 		}
 	}
 
+	if !in.actionLeave && !in.actionAppend {
+		contexts, err := dockerCli.ContextStore().List()
+		if err != nil {
+			return err
+		}
+		for _, c := range contexts {
+			if c.Name == name {
+				logrus.Warnf("instance name %q already exists as context builder", name)
+				break
+			}
+		}
+	}
+
 	ng, err := txn.NodeGroupByName(name)
 	if err != nil {
 		if os.IsNotExist(errors.Cause(err)) {
@@ -90,29 +95,62 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 				logrus.Warnf("failed to find %q for append, creating a new instance instead", in.name)
 			}
 			if in.actionLeave {
-				return errors.Errorf("failed to find instance %q for leave", name)
+				return errors.Errorf("failed to find instance %q for leave", in.name)
 			}
 		} else {
 			return err
 		}
 	}
 
+	buildkitHost := os.Getenv("BUILDKIT_HOST")
+
+	driverName := in.driver
+	if driverName == "" {
+		if ng != nil {
+			driverName = ng.Driver
+		} else if len(args) == 0 && buildkitHost != "" {
+			driverName = "remote"
+		} else {
+			var arg string
+			if len(args) > 0 {
+				arg = args[0]
+			}
+			f, err := driver.GetDefaultFactory(ctx, arg, dockerCli.Client(), true)
+			if err != nil {
+				return err
+			}
+			if f == nil {
+				return errors.Errorf("no valid drivers found")
+			}
+			driverName = f.Name()
+		}
+	}
+
 	if ng != nil {
 		if in.nodeName == "" && !in.actionAppend {
-			return errors.Errorf("existing instance for %s but no append mode, specify --node to make changes for existing instances", name)
+			return errors.Errorf("existing instance for %q but no append mode, specify --node to make changes for existing instances", name)
 		}
+		if driverName != ng.Driver {
+			return errors.Errorf("existing instance for %q but has mismatched driver %q", name, ng.Driver)
+		}
+	}
+
+	if driver.GetFactory(driverName, true) == nil {
+		return errors.Errorf("failed to find driver %q", driverName)
+	}
+
+	ngOriginal := ng
+	if ngOriginal != nil {
+		ngOriginal = ngOriginal.Copy()
 	}
 
 	if ng == nil {
 		ng = &store.NodeGroup{
-			Name: name,
+			Name:   name,
+			Driver: driverName,
 		}
 	}
 
-	if ng.Driver == "" || in.driver != "" {
-		ng.Driver = driverName
-	}
-
 	var flags []string
 	if in.flags != "" {
 		flags, err = shlex.Split(in.flags)
@@ -122,31 +160,72 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 	}
 
 	var ep string
+	var setEp bool
 	if in.actionLeave {
 		if err := ng.Leave(in.nodeName); err != nil {
 			return err
 		}
 	} else {
-		if len(args) > 0 {
+		switch {
+		case driverName == "kubernetes":
+			if len(args) > 0 {
+				logrus.Warnf("kubernetes driver does not support endpoint args %q", args[0])
+			}
+			// naming endpoint to make --append works
+			ep = (&url.URL{
+				Scheme: driverName,
+				Path:   "/" + in.name,
+				RawQuery: (&url.Values{
+					"deployment": {in.nodeName},
+					"kubeconfig": {os.Getenv("KUBECONFIG")},
+				}).Encode(),
+			}).String()
+			setEp = false
+		case driverName == "remote":
+			if len(args) > 0 {
+				ep = args[0]
+			} else if buildkitHost != "" {
+				ep = buildkitHost
+			} else {
+				return errors.Errorf("no remote endpoint provided")
+			}
+			ep, err = validateBuildkitEndpoint(ep)
+			if err != nil {
+				return err
+			}
+			setEp = true
+		case len(args) > 0:
 			ep, err = validateEndpoint(dockerCli, args[0])
 			if err != nil {
 				return err
 			}
-		} else {
+			setEp = true
+		default:
 			if dockerCli.CurrentContext() == "default" && dockerCli.DockerEndpoint().TLSData != nil {
 				return errors.Errorf("could not create a builder instance with TLS data loaded from environment. Please use `docker context create <context-name>` to create a context for current environment and then create a builder instance with `docker buildx create <context-name>`")
 			}
-
-			ep, err = getCurrentEndpoint(dockerCli)
+			ep, err = storeutil.GetCurrentEndpoint(dockerCli)
 			if err != nil {
 				return err
 			}
+			setEp = false
 		}
+
 		m, err := csvToMap(in.driverOpts)
 		if err != nil {
 			return err
 		}
-		if err := ng.Update(in.nodeName, ep, in.platform, len(args) > 0, in.actionAppend, flags, in.configFile, m); err != nil {
+
+		if in.configFile == "" {
+			// if buildkit config is not provided, check if the default one is
+			// available and use it
+			if f, ok := confutil.DefaultConfigFile(dockerCli); ok {
+				logrus.Warnf("Using default BuildKit config in %s", f)
+				in.configFile = f
+			}
+		}
+
+		if err := ng.Update(in.nodeName, ep, in.platform, setEp, in.actionAppend, flags, in.configFile, m); err != nil {
 			return err
 		}
 	}
@@ -155,8 +234,32 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 		return err
 	}
 
+	ngi := &nginfo{ng: ng}
+
+	timeoutCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
+	defer cancel()
+
+	if err = loadNodeGroupData(timeoutCtx, dockerCli, ngi); err != nil {
+		return err
+	}
+	for _, info := range ngi.drivers {
+		if err := info.di.Err; err != nil {
+			err := errors.Errorf("failed to initialize builder %s (%s): %s", ng.Name, info.di.Name, err)
+			var err2 error
+			if ngOriginal == nil {
+				err2 = txn.Remove(ng.Name)
+			} else {
+				err2 = txn.Save(ngOriginal)
+			}
+			if err2 != nil {
+				logrus.Warnf("Could not rollback to previous state: %s", err2)
+			}
+			return err
+		}
+	}
+
 	if in.use && ep != "" {
-		current, err := getCurrentEndpoint(dockerCli)
+		current, err := storeutil.GetCurrentEndpoint(dockerCli)
 		if err != nil {
 			return err
 		}
@@ -165,6 +268,12 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 		}
 	}
 
+	if in.bootstrap {
+		if _, err = boot(ctx, ngi); err != nil {
+			return err
+		}
+	}
+
 	fmt.Printf("%s\n", ng.Name)
 	return nil
 }
@@ -172,9 +281,12 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 func createCmd(dockerCli command.Cli) *cobra.Command {
 	var options createOptions
 
-	var drivers []string
-	for s := range driver.GetFactories() {
-		drivers = append(drivers, s)
+	var drivers bytes.Buffer
+	for _, d := range driver.GetFactories() {
+		if len(drivers.String()) > 0 {
+			drivers.WriteString(", ")
+		}
+		drivers.WriteString(fmt.Sprintf(`"%s"`, d.Name()))
 	}
 
 	cmd := &cobra.Command{
@@ -189,23 +301,28 @@ func createCmd(dockerCli command.Cli) *cobra.Command {
 	flags := cmd.Flags()
 
 	flags.StringVar(&options.name, "name", "", "Builder instance name")
-	flags.StringVar(&options.driver, "driver", "", fmt.Sprintf("Driver to use (available: %v)", drivers))
+	flags.StringVar(&options.driver, "driver", "", fmt.Sprintf("Driver to use (available: %s)", drivers.String()))
 	flags.StringVar(&options.nodeName, "node", "", "Create/modify node with given name")
 	flags.StringVar(&options.flags, "buildkitd-flags", "", "Flags for buildkitd daemon")
 	flags.StringVar(&options.configFile, "config", "", "BuildKit config file")
 	flags.StringArrayVar(&options.platform, "platform", []string{}, "Fixed platforms for current node")
 	flags.StringArrayVar(&options.driverOpts, "driver-opt", []string{}, "Options for the driver")
+	flags.BoolVar(&options.bootstrap, "bootstrap", false, "Boot builder after creation")
 
 	flags.BoolVar(&options.actionAppend, "append", false, "Append a node to builder instead of changing it")
 	flags.BoolVar(&options.actionLeave, "leave", false, "Remove a node from builder instead of changing it")
 	flags.BoolVar(&options.use, "use", false, "Set the current builder instance")
 
-	_ = flags
+	// hide builder persistent flag for this command
+	cobrautil.HideInheritedFlags(cmd, "builder")
 
 	return cmd
 }
 
 func csvToMap(in []string) (map[string]string, error) {
+	if len(in) == 0 {
+		return nil, nil
+	}
 	m := make(map[string]string, len(in))
 	for _, s := range in {
 		csvReader := csv.NewReader(strings.NewReader(s))

commands/create_test.go

@@ -0,0 +1,26 @@
+package commands
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCsvToMap(t *testing.T) {
+	d := []string{
+		"\"tolerations=key=foo,value=bar;key=foo2,value=bar2\",replicas=1",
+		"namespace=default",
+	}
+	r, err := csvToMap(d)
+
+	require.NoError(t, err)
+
+	require.Contains(t, r, "tolerations")
+	require.Equal(t, r["tolerations"], "key=foo,value=bar;key=foo2,value=bar2")
+
+	require.Contains(t, r, "replicas")
+	require.Equal(t, r["replicas"], "1")
+
+	require.Contains(t, r, "namespace")
+	require.Equal(t, r["namespace"], "default")
+}

commands/diskusage.go

@@ -4,16 +4,18 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 	"text/tabwriter"
+	"time"
 
 	"github.com/docker/buildx/build"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/opts"
+	"github.com/docker/go-units"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/util/appcontext"
 	"github.com/spf13/cobra"
-	"github.com/tonistiigi/units"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -109,7 +111,6 @@ func duCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 			options.builder = rootOpts.builder
 			return runDiskUsage(dockerCli, options)
 		},
-		Annotations: map[string]string{"version": "1.00"},
 	}
 
 	flags := cmd.Flags()
@@ -126,20 +127,20 @@ func printKV(w io.Writer, k string, v interface{}) {
 func printVerbose(tw *tabwriter.Writer, du []*client.UsageInfo) {
 	for _, di := range du {
 		printKV(tw, "ID", di.ID)
-		if di.Parent != "" {
-			printKV(tw, "Parent", di.Parent)
+		if len(di.Parents) != 0 {
+			printKV(tw, "Parent", strings.Join(di.Parents, ","))
 		}
 		printKV(tw, "Created at", di.CreatedAt)
 		printKV(tw, "Mutable", di.Mutable)
 		printKV(tw, "Reclaimable", !di.InUse)
 		printKV(tw, "Shared", di.Shared)
-		printKV(tw, "Size", fmt.Sprintf("%.2f", units.Bytes(di.Size)))
+		printKV(tw, "Size", units.HumanSize(float64(di.Size)))
 		if di.Description != "" {
 			printKV(tw, "Description", di.Description)
 		}
 		printKV(tw, "Usage count", di.UsageCount)
 		if di.LastUsedAt != nil {
-			printKV(tw, "Last used", di.LastUsedAt)
+			printKV(tw, "Last used", units.HumanDuration(time.Since(*di.LastUsedAt))+" ago")
 		}
 		if di.RecordType != "" {
 			printKV(tw, "Type", di.RecordType)
@@ -160,11 +161,15 @@ func printTableRow(tw *tabwriter.Writer, di *client.UsageInfo) {
 	if di.Mutable {
 		id += "*"
 	}
-	size := fmt.Sprintf("%.2f", units.Bytes(di.Size))
+	size := units.HumanSize(float64(di.Size))
 	if di.Shared {
 		size += "*"
 	}
-	fmt.Fprintf(tw, "%-71s\t%-11v\t%s\t\n", id, !di.InUse, size)
+	lastAccessed := ""
+	if di.LastUsedAt != nil {
+		lastAccessed = units.HumanDuration(time.Since(*di.LastUsedAt)) + " ago"
+	}
+	fmt.Fprintf(tw, "%-40s\t%-5v\t%-10s\t%s\n", id, !di.InUse, size, lastAccessed)
 }
 
 func printSummary(tw *tabwriter.Writer, dus [][]*client.UsageInfo) {
@@ -186,14 +191,12 @@ func printSummary(tw *tabwriter.Writer, dus [][]*client.UsageInfo) {
 		}
 	}
 
-	tw = tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
-
 	if shared > 0 {
-		fmt.Fprintf(tw, "Shared:\t%.2f\n", units.Bytes(shared))
-		fmt.Fprintf(tw, "Private:\t%.2f\n", units.Bytes(total-shared))
+		fmt.Fprintf(tw, "Shared:\t%s\n", units.HumanSize(float64(shared)))
+		fmt.Fprintf(tw, "Private:\t%s\n", units.HumanSize(float64(total-shared)))
 	}
 
-	fmt.Fprintf(tw, "Reclaimable:\t%.2f\n", units.Bytes(reclaimable))
-	fmt.Fprintf(tw, "Total:\t%.2f\n", units.Bytes(total))
+	fmt.Fprintf(tw, "Reclaimable:\t%s\n", units.HumanSize(float64(reclaimable)))
+	fmt.Fprintf(tw, "Total:\t%s\n", units.HumanSize(float64(total)))
 	tw.Flush()
 }

commands/imagetools/create.go

@@ -1,12 +1,16 @@
 package commands
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
+	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/buildx/util/imagetools"
+	"github.com/docker/buildx/util/progress"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/distribution/reference"
 	"github.com/moby/buildkit/util/appcontext"
@@ -18,10 +22,12 @@ import (
 )
 
 type createOptions struct {
+	builder      string
 	files        []string
 	tags         []string
 	dryrun       bool
 	actionAppend bool
+	progress     string
 }
 
 func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
@@ -35,7 +41,7 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 
 	fileArgs := make([]string, len(in.files))
 	for i, f := range in.files {
-		dt, err := ioutil.ReadFile(f)
+		dt, err := os.ReadFile(f)
 		if err != nil {
 			return err
 		}
@@ -75,18 +81,21 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 	if len(repos) == 0 {
 		return errors.Errorf("no repositories specified, please set a reference in tag or source")
 	}
-	if len(repos) > 1 {
-		return errors.Errorf("multiple repositories currently not supported, found %v", repos)
-	}
 
-	var repo string
-	for r := range repos {
-		repo = r
+	var defaultRepo *string
+	if len(repos) == 1 {
+		for repo := range repos {
+			defaultRepo = &repo
+		}
 	}
 
 	for i, s := range srcs {
 		if s.Ref == nil && s.Desc.MediaType == "" && s.Desc.Digest != "" {
-			n, err := reference.ParseNormalizedNamed(repo)
+			if defaultRepo == nil {
+				return errors.Errorf("multiple repositories specified, cannot infer repository for %q", args[i])
+			}
+
+			n, err := reference.ParseNormalizedNamed(*defaultRepo)
 			if err != nil {
 				return err
 			}
@@ -101,9 +110,32 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 
 	ctx := appcontext.Context()
 
-	r := imagetools.New(imagetools.Opt{
-		Auth: dockerCli.ConfigFile(),
-	})
+	txn, release, err := storeutil.GetStore(dockerCli)
+	if err != nil {
+		return err
+	}
+	defer release()
+
+	var ng *store.NodeGroup
+
+	if in.builder != "" {
+		ng, err = storeutil.GetNodeGroup(txn, dockerCli, in.builder)
+		if err != nil {
+			return err
+		}
+	} else {
+		ng, err = storeutil.GetCurrentInstance(txn, dockerCli)
+		if err != nil {
+			return err
+		}
+	}
+
+	imageopt, err := storeutil.GetImageConfig(dockerCli, ng)
+	if err != nil {
+		return err
+	}
+
+	r := imagetools.New(imageopt)
 
 	if sourceRefs {
 		eg, ctx2 := errgroup.WithContext(ctx)
@@ -117,8 +149,15 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 					if err != nil {
 						return err
 					}
-					srcs[i].Ref = nil
-					srcs[i].Desc = desc
+					if srcs[i].Desc.Digest == "" {
+						srcs[i].Desc = desc
+					} else {
+						var err error
+						srcs[i].Desc, err = mergeDesc(desc, srcs[i].Desc)
+						if err != nil {
+							return err
+						}
+					}
 					return nil
 				})
 			}(i)
@@ -128,12 +167,7 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 		}
 	}
 
-	descs := make([]ocispec.Descriptor, len(srcs))
-	for i := range descs {
-		descs[i] = srcs[i].Desc
-	}
-
-	dt, desc, err := r.Combine(ctx, repo, descs)
+	dt, desc, err := r.Combine(ctx, srcs)
 	if err != nil {
 		return err
 	}
@@ -144,31 +178,55 @@ func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
 	}
 
 	// new resolver cause need new auth
-	r = imagetools.New(imagetools.Opt{
-		Auth: dockerCli.ConfigFile(),
-	})
+	r = imagetools.New(imageopt)
+
+	ctx2, cancel := context.WithCancel(context.TODO())
+	defer cancel()
+	printer := progress.NewPrinter(ctx2, os.Stderr, os.Stderr, in.progress)
+
+	eg, _ := errgroup.WithContext(ctx)
+	pw := progress.WithPrefix(printer, "internal", true)
 
 	for _, t := range tags {
-		if err := r.Push(ctx, t, desc, dt); err != nil {
-			return err
-		}
-		fmt.Println(t.String())
+		t := t
+		eg.Go(func() error {
+			return progress.Wrap(fmt.Sprintf("pushing %s", t.String()), pw.Write, func(sub progress.SubLogger) error {
+				eg2, _ := errgroup.WithContext(ctx)
+				for _, s := range srcs {
+					if reference.Domain(s.Ref) == reference.Domain(t) && reference.Path(s.Ref) == reference.Path(t) {
+						continue
+					}
+					s := s
+					eg2.Go(func() error {
+						sub.Log(1, []byte(fmt.Sprintf("copying %s from %s to %s\n", s.Desc.Digest.String(), s.Ref.String(), t.String())))
+						return r.Copy(ctx, s, t)
+					})
+				}
+
+				if err := eg2.Wait(); err != nil {
+					return err
+				}
+				sub.Log(1, []byte(fmt.Sprintf("pushing %s to %s\n", desc.Digest.String(), t.String())))
+				return r.Push(ctx, t, desc, dt)
+			})
+		})
 	}
 
-	return nil
+	err = eg.Wait()
+	err1 := printer.Wait()
+	if err == nil {
+		err = err1
+	}
+
+	return err
 }
 
-type src struct {
-	Desc ocispec.Descriptor
-	Ref  reference.Named
-}
-
-func parseSources(in []string) ([]*src, error) {
-	out := make([]*src, len(in))
+func parseSources(in []string) ([]*imagetools.Source, error) {
+	out := make([]*imagetools.Source, len(in))
 	for i, in := range in {
 		s, err := parseSource(in)
 		if err != nil {
-			return nil, errors.Wrapf(err, "failed to parse source %q, valid sources are digests, refereces and descriptors", in)
+			return nil, errors.Wrapf(err, "failed to parse source %q, valid sources are digests, references and descriptors", in)
 		}
 		out[i] = s
 	}
@@ -187,11 +245,11 @@ func parseRefs(in []string) ([]reference.Named, error) {
 	return refs, nil
 }
 
-func parseSource(in string) (*src, error) {
+func parseSource(in string) (*imagetools.Source, error) {
 	// source can be a digest, reference or a descriptor JSON
 	dgst, err := digest.Parse(in)
 	if err == nil {
-		return &src{
+		return &imagetools.Source{
 			Desc: ocispec.Descriptor{
 				Digest: dgst,
 			},
@@ -202,39 +260,54 @@ func parseSource(in string) (*src, error) {
 
 	ref, err := reference.ParseNormalizedNamed(in)
 	if err == nil {
-		return &src{
+		return &imagetools.Source{
 			Ref: ref,
 		}, nil
 	} else if !strings.HasPrefix(in, "{") {
 		return nil, err
 	}
 
-	var s src
+	var s imagetools.Source
 	if err := json.Unmarshal([]byte(in), &s.Desc); err != nil {
 		return nil, errors.WithStack(err)
 	}
 	return &s, nil
 }
 
-func createCmd(dockerCli command.Cli) *cobra.Command {
+func createCmd(dockerCli command.Cli, opts RootOptions) *cobra.Command {
 	var options createOptions
 
 	cmd := &cobra.Command{
 		Use:   "create [OPTIONS] [SOURCE] [SOURCE...]",
 		Short: "Create a new image based on source images",
 		RunE: func(cmd *cobra.Command, args []string) error {
+			options.builder = *opts.Builder
 			return runCreate(dockerCli, options, args)
 		},
 	}
 
 	flags := cmd.Flags()
-
 	flags.StringArrayVarP(&options.files, "file", "f", []string{}, "Read source descriptor from file")
 	flags.StringArrayVarP(&options.tags, "tag", "t", []string{}, "Set reference for new image")
 	flags.BoolVar(&options.dryrun, "dry-run", false, "Show final image instead of pushing")
 	flags.BoolVar(&options.actionAppend, "append", false, "Append to existing manifest")
-
-	_ = flags
+	flags.StringVar(&options.progress, "progress", "auto", `Set type of progress output ("auto", "plain", "tty"). Use plain to show container output`)
 
 	return cmd
 }
+
+func mergeDesc(d1, d2 ocispec.Descriptor) (ocispec.Descriptor, error) {
+	if d2.Size != 0 && d1.Size != d2.Size {
+		return ocispec.Descriptor{}, errors.Errorf("invalid size mismatch for %s, %d != %d", d1.Digest, d2.Size, d1.Size)
+	}
+	if d2.MediaType != "" {
+		d1.MediaType = d2.MediaType
+	}
+	if len(d2.Annotations) != 0 {
+		d1.Annotations = d2.Annotations // no merge so support removes
+	}
+	if d2.Platform != nil {
+		d1.Platform = d2.Platform // missing items filled in later from image config
+	}
+	return d1, nil
+}

commands/imagetools/inspect.go

@@ -1,68 +1,82 @@
 package commands
 
 import (
-	"fmt"
-	"os"
-
-	"github.com/containerd/containerd/images"
+	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/buildx/util/imagetools"
+	"github.com/docker/cli-docs-tool/annotation"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/moby/buildkit/util/appcontext"
-	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
 type inspectOptions struct {
-	raw bool
+	builder string
+	format  string
+	raw     bool
 }
 
 func runInspect(dockerCli command.Cli, in inspectOptions, name string) error {
 	ctx := appcontext.Context()
 
-	r := imagetools.New(imagetools.Opt{
-		Auth: dockerCli.ConfigFile(),
-	})
+	if in.format != "" && in.raw {
+		return errors.Errorf("format and raw cannot be used together")
+	}
 
-	dt, desc, err := r.Get(ctx, name)
+	txn, release, err := storeutil.GetStore(dockerCli)
+	if err != nil {
+		return err
+	}
+	defer release()
+
+	var ng *store.NodeGroup
+
+	if in.builder != "" {
+		ng, err = storeutil.GetNodeGroup(txn, dockerCli, in.builder)
+		if err != nil {
+			return err
+		}
+	} else {
+		ng, err = storeutil.GetCurrentInstance(txn, dockerCli)
+		if err != nil {
+			return err
+		}
+	}
+
+	imageopt, err := storeutil.GetImageConfig(dockerCli, ng)
 	if err != nil {
 		return err
 	}
 
-	if in.raw {
-		fmt.Printf("%s", dt) // avoid newline to keep digest
-		return nil
+	p, err := imagetools.NewPrinter(ctx, imageopt, name, in.format)
+	if err != nil {
+		return err
 	}
 
-	switch desc.MediaType {
-	// case images.MediaTypeDockerSchema2Manifest, specs.MediaTypeImageManifest:
-	// TODO: handle distribution manifest and schema1
-	case images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex:
-		imagetools.PrintManifestList(dt, desc, name, os.Stdout)
-	default:
-		fmt.Printf("%s\n", dt)
-	}
-
-	return nil
+	return p.Print(in.raw, dockerCli.Out())
 }
 
-func inspectCmd(dockerCli command.Cli) *cobra.Command {
+func inspectCmd(dockerCli command.Cli, rootOpts RootOptions) *cobra.Command {
 	var options inspectOptions
 
 	cmd := &cobra.Command{
 		Use:   "inspect [OPTIONS] NAME",
-		Short: "Show details of image in the registry",
+		Short: "Show details of an image in the registry",
 		Args:  cli.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
+			options.builder = *rootOpts.Builder
 			return runInspect(dockerCli, options, args[0])
 		},
 	}
 
 	flags := cmd.Flags()
 
-	flags.BoolVar(&options.raw, "raw", false, "Show original JSON manifest")
+	flags.StringVar(&options.format, "format", "", "Format the output using the given Go template")
+	flags.SetAnnotation("format", annotation.DefaultValue, []string{`"{{.Manifest}}"`})
 
-	_ = flags
+	flags.BoolVar(&options.raw, "raw", false, "Show original, unformatted JSON manifest")
 
 	return cmd
 }

commands/imagetools/root.go

@@ -5,15 +5,19 @@ import (
 	"github.com/spf13/cobra"
 )
 
-func RootCmd(dockerCli command.Cli) *cobra.Command {
+type RootOptions struct {
+	Builder *string
+}
+
+func RootCmd(dockerCli command.Cli, opts RootOptions) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "imagetools",
 		Short: "Commands to work on images in registry",
 	}
 
 	cmd.AddCommand(
-		inspectCmd(dockerCli),
-		createCmd(dockerCli),
+		createCmd(dockerCli, opts),
+		inspectCmd(dockerCli, opts),
 	)
 
 	return cmd

commands/inspect.go

@@ -8,17 +8,13 @@ import (
 	"text/tabwriter"
 	"time"
 
-	"github.com/docker/buildx/build"
-	"github.com/docker/buildx/driver"
 	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/buildx/util/platformutil"
-	"github.com/docker/buildx/util/progress"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/moby/buildkit/util/appcontext"
-	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/spf13/cobra"
-	"golang.org/x/sync/errgroup"
 )
 
 type inspectOptions struct {
@@ -26,23 +22,10 @@ type inspectOptions struct {
 	builder   string
 }
 
-type dinfo struct {
-	di        *build.DriverInfo
-	info      *driver.Info
-	platforms []specs.Platform
-	err       error
-}
-
-type nginfo struct {
-	ng      *store.NodeGroup
-	drivers []dinfo
-	err     error
-}
-
 func runInspect(dockerCli command.Cli, in inspectOptions) error {
 	ctx := appcontext.Context()
 
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
@@ -51,12 +34,12 @@ func runInspect(dockerCli command.Cli, in inspectOptions) error {
 	var ng *store.NodeGroup
 
 	if in.builder != "" {
-		ng, err = getNodeGroup(txn, dockerCli, in.builder)
+		ng, err = storeutil.GetNodeGroup(txn, dockerCli, in.builder)
 		if err != nil {
 			return err
 		}
 	} else {
-		ng, err = getCurrentInstance(txn, dockerCli)
+		ng, err = storeutil.GetCurrentInstance(txn, dockerCli)
 		if err != nil {
 			return err
 		}
@@ -74,17 +57,19 @@ func runInspect(dockerCli command.Cli, in inspectOptions) error {
 
 	ngi := &nginfo{ng: ng}
 
-	timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	timeoutCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
 	defer cancel()
 
 	err = loadNodeGroupData(timeoutCtx, dockerCli, ngi)
 
+	var bootNgi *nginfo
 	if in.bootstrap {
 		var ok bool
 		ok, err = boot(ctx, ngi)
 		if err != nil {
 			return err
 		}
+		bootNgi = ngi
 		if ok {
 			ngi = &nginfo{ng: ng}
 			err = loadNodeGroupData(ctx, dockerCli, ngi)
@@ -94,6 +79,7 @@ func runInspect(dockerCli command.Cli, in inspectOptions) error {
 	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
 	fmt.Fprintf(w, "Name:\t%s\n", ngi.ng.Name)
 	fmt.Fprintf(w, "Driver:\t%s\n", ngi.ng.Driver)
+
 	if err != nil {
 		fmt.Fprintf(w, "Error:\t%s\n", err.Error())
 	} else if ngi.err != nil {
@@ -109,10 +95,21 @@ func runInspect(dockerCli command.Cli, in inspectOptions) error {
 			}
 			fmt.Fprintf(w, "Name:\t%s\n", n.Name)
 			fmt.Fprintf(w, "Endpoint:\t%s\n", n.Endpoint)
+
+			var driverOpts []string
+			for k, v := range n.DriverOpts {
+				driverOpts = append(driverOpts, fmt.Sprintf("%s=%q", k, v))
+			}
+			if len(driverOpts) > 0 {
+				fmt.Fprintf(w, "Driver Options:\t%s\n", strings.Join(driverOpts, " "))
+			}
+
 			if err := ngi.drivers[i].di.Err; err != nil {
 				fmt.Fprintf(w, "Error:\t%s\n", err.Error())
 			} else if err := ngi.drivers[i].err; err != nil {
 				fmt.Fprintf(w, "Error:\t%s\n", err.Error())
+			} else if bootNgi != nil && len(bootNgi.drivers) > i && bootNgi.drivers[i].err != nil {
+				fmt.Fprintf(w, "Error:\t%s\n", bootNgi.drivers[i].err.Error())
 			} else {
 				fmt.Fprintf(w, "Status:\t%s\n", ngi.drivers[i].info.Status)
 				if len(n.Flags) > 0 {
@@ -145,47 +142,7 @@ func inspectCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	}
 
 	flags := cmd.Flags()
-
 	flags.BoolVar(&options.bootstrap, "bootstrap", false, "Ensure builder has booted before inspecting")
 
-	_ = flags
-
 	return cmd
 }
-
-func boot(ctx context.Context, ngi *nginfo) (bool, error) {
-	toBoot := make([]int, 0, len(ngi.drivers))
-	for i, d := range ngi.drivers {
-		if d.err != nil || d.di.Err != nil || d.di.Driver == nil || d.info == nil {
-			continue
-		}
-		if d.info.Status != driver.Running {
-			toBoot = append(toBoot, i)
-		}
-	}
-	if len(toBoot) == 0 {
-		return false, nil
-	}
-
-	pw := progress.NewPrinter(context.TODO(), os.Stderr, "auto")
-
-	mw := progress.NewMultiWriter(pw)
-
-	eg, _ := errgroup.WithContext(ctx)
-	for _, idx := range toBoot {
-		func(idx int) {
-			eg.Go(func() error {
-				pw := mw.WithPrefix(ngi.ng.Nodes[idx].Name, len(toBoot) > 1)
-				_, err := driver.Boot(ctx, ngi.drivers[idx].di.Driver, pw)
-				if err != nil {
-					ngi.drivers[idx].err = err
-				}
-				close(pw.Status())
-				<-pw.Done()
-				return nil
-			})
-		}(idx)
-	}
-
-	return true, eg.Wait()
-}

commands/install.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"os"
 
+	"github.com/docker/buildx/util/cobrautil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/config"
@@ -48,5 +49,8 @@ func installCmd(dockerCli command.Cli) *cobra.Command {
 		Hidden: true,
 	}
 
+	// hide builder persistent flag for this command
+	cobrautil.HideInheritedFlags(cmd, "builder")
+
 	return cmd
 }

commands/ls.go

@@ -4,12 +4,14 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"os"
+	"sort"
 	"strings"
 	"text/tabwriter"
 	"time"
 
 	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
+	"github.com/docker/buildx/util/cobrautil"
 	"github.com/docker/buildx/util/platformutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -24,13 +26,13 @@ type lsOptions struct {
 func runLs(dockerCli command.Cli, in lsOptions) error {
 	ctx := appcontext.Context()
 
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
 	defer release()
 
-	ctx, cancel := context.WithTimeout(ctx, 7*time.Second)
+	ctx, cancel := context.WithTimeout(ctx, 20*time.Second)
 	defer cancel()
 
 	ll, err := txn.List()
@@ -43,23 +45,30 @@ func runLs(dockerCli command.Cli, in lsOptions) error {
 		builders[i] = &nginfo{ng: ng}
 	}
 
-	list, err := dockerCli.ContextStore().List()
+	contexts, err := dockerCli.ContextStore().List()
 	if err != nil {
 		return err
 	}
-	ctxbuilders := make([]*nginfo, len(list))
-	for i, l := range list {
-		ctxbuilders[i] = &nginfo{ng: &store.NodeGroup{
-			Name: l.Name,
+	sort.Slice(contexts, func(i, j int) bool {
+		return contexts[i].Name < contexts[j].Name
+	})
+	for _, c := range contexts {
+		ngi := &nginfo{ng: &store.NodeGroup{
+			Name: c.Name,
 			Nodes: []store.Node{{
-				Name:     l.Name,
-				Endpoint: l.Name,
+				Name:     c.Name,
+				Endpoint: c.Name,
 			}},
 		}}
+		// if a context has the same name as an instance from the store, do not
+		// add it to the builders list. An instance from the store takes
+		// precedence over context builders.
+		if hasNodeGroup(builders, ngi) {
+			continue
+		}
+		builders = append(builders, ngi)
 	}
 
-	builders = append(builders, ctxbuilders...)
-
 	eg, _ := errgroup.WithContext(ctx)
 
 	for _, b := range builders {
@@ -79,7 +88,7 @@ func runLs(dockerCli command.Cli, in lsOptions) error {
 	}
 
 	currentName := "default"
-	current, err := getCurrentInstance(txn, dockerCli)
+	current, err := storeutil.GetCurrentInstance(txn, dockerCli)
 	if err != nil {
 		return err
 	}
@@ -90,49 +99,72 @@ func runLs(dockerCli command.Cli, in lsOptions) error {
 		}
 	}
 
-	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
-	fmt.Fprintf(w, "NAME/NODE\tDRIVER/ENDPOINT\tSTATUS\tPLATFORMS\n")
+	w := tabwriter.NewWriter(dockerCli.Out(), 0, 0, 1, ' ', 0)
+	fmt.Fprintf(w, "NAME/NODE\tDRIVER/ENDPOINT\tSTATUS\tBUILDKIT\tPLATFORMS\n")
 
 	currentSet := false
+	printErr := false
 	for _, b := range builders {
 		if !currentSet && b.ng.Name == currentName {
 			b.ng.Name += " *"
 			currentSet = true
 		}
-		printngi(w, b)
+		if ok := printngi(w, b); !ok {
+			printErr = true
+		}
 	}
 
 	w.Flush()
 
+	if printErr {
+		_, _ = fmt.Fprintf(dockerCli.Err(), "\n")
+		for _, b := range builders {
+			if b.err != nil {
+				_, _ = fmt.Fprintf(dockerCli.Err(), "Cannot load builder %s: %s\n", b.ng.Name, strings.TrimSpace(b.err.Error()))
+			} else {
+				for idx, n := range b.ng.Nodes {
+					d := b.drivers[idx]
+					var nodeErr string
+					if d.err != nil {
+						nodeErr = d.err.Error()
+					} else if d.di.Err != nil {
+						nodeErr = d.di.Err.Error()
+					}
+					if nodeErr != "" {
+						_, _ = fmt.Fprintf(dockerCli.Err(), "Failed to get status for %s (%s): %s\n", b.ng.Name, n.Name, strings.TrimSpace(nodeErr))
+					}
+				}
+			}
+		}
+	}
+
 	return nil
 }
 
-func printngi(w io.Writer, ngi *nginfo) {
+func printngi(w io.Writer, ngi *nginfo) (ok bool) {
+	ok = true
 	var err string
 	if ngi.err != nil {
-		err = ngi.err.Error()
+		ok = false
+		err = "error"
 	}
-	fmt.Fprintf(w, "%s\t%s\t%s\t\n", ngi.ng.Name, ngi.ng.Driver, err)
+	fmt.Fprintf(w, "%s\t%s\t%s\t\t\n", ngi.ng.Name, ngi.ng.Driver, err)
 	if ngi.err == nil {
 		for idx, n := range ngi.ng.Nodes {
 			d := ngi.drivers[idx]
-			var err string
-			if d.err != nil {
-				err = d.err.Error()
-			} else if d.di.Err != nil {
-				err = d.di.Err.Error()
-			}
 			var status string
 			if d.info != nil {
 				status = d.info.Status.String()
 			}
-			if err != "" {
-				fmt.Fprintf(w, "  %s\t%s\t%s\n", n.Name, n.Endpoint, err)
+			if d.err != nil || d.di.Err != nil {
+				ok = false
+				fmt.Fprintf(w, "  %s\t%s\t%s\t\t\n", n.Name, n.Endpoint, "error")
 			} else {
-				fmt.Fprintf(w, "  %s\t%s\t%s\t%s\n", n.Name, n.Endpoint, status, strings.Join(platformutil.FormatInGroups(n.Platforms, d.platforms), ", "))
+				fmt.Fprintf(w, "  %s\t%s\t%s\t%s\t%s\n", n.Name, n.Endpoint, status, d.version, strings.Join(platformutil.FormatInGroups(n.Platforms, d.platforms), ", "))
 			}
 		}
 	}
+	return
 }
 
 func lsCmd(dockerCli command.Cli) *cobra.Command {
@@ -147,5 +179,8 @@ func lsCmd(dockerCli command.Cli) *cobra.Command {
 		},
 	}
 
+	// hide builder persistent flag for this command
+	cobrautil.HideInheritedFlags(cmd, "builder")
+
 	return cmd
 }

commands/print.go

@@ -0,0 +1,48 @@
+package commands
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/docker/buildx/build"
+	"github.com/docker/docker/api/types/versions"
+	"github.com/moby/buildkit/frontend/subrequests"
+	"github.com/moby/buildkit/frontend/subrequests/outline"
+	"github.com/moby/buildkit/frontend/subrequests/targets"
+)
+
+func printResult(f *build.PrintFunc, res map[string]string) error {
+	switch f.Name {
+	case "outline":
+		return printValue(outline.PrintOutline, outline.SubrequestsOutlineDefinition.Version, f.Format, res)
+	case "targets":
+		return printValue(targets.PrintTargets, targets.SubrequestsTargetsDefinition.Version, f.Format, res)
+	case "subrequests.describe":
+		return printValue(subrequests.PrintDescribe, subrequests.SubrequestsDescribeDefinition.Version, f.Format, res)
+	default:
+		if dt, ok := res["result.txt"]; ok {
+			fmt.Print(dt)
+		} else {
+			log.Printf("%s %+v", f, res)
+		}
+	}
+	return nil
+}
+
+type printFunc func([]byte, io.Writer) error
+
+func printValue(printer printFunc, version string, format string, res map[string]string) error {
+	if format == "json" {
+		fmt.Fprintln(os.Stdout, res["result.json"])
+		return nil
+	}
+
+	if res["version"] != "" && versions.LessThan(version, res["version"]) && res["result.txt"] != "" {
+		// structure is too new and we don't know how to print it
+		fmt.Fprint(os.Stdout, res["result.txt"])
+		return nil
+	}
+	return printer([]byte(res["result.json"]), os.Stdout)
+}

commands/prune.go

@@ -12,11 +12,11 @@ import (
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/opts"
 	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/go-units"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/util/appcontext"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
-	"github.com/tonistiigi/units"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -119,7 +119,7 @@ func runPrune(dockerCli command.Cli, opts pruneOptions) error {
 	<-printed
 
 	tw = tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
-	fmt.Fprintf(tw, "Total:\t%.2f\n", units.Bytes(total))
+	fmt.Fprintf(tw, "Total:\t%s\n", units.HumanSize(float64(total)))
 	tw.Flush()
 	return nil
 }
@@ -129,21 +129,20 @@ func pruneCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "prune",
-		Short: "Remove build cache ",
+		Short: "Remove build cache",
 		Args:  cli.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			options.builder = rootOpts.builder
 			return runPrune(dockerCli, options)
 		},
-		Annotations: map[string]string{"version": "1.00"},
 	}
 
 	flags := cmd.Flags()
-	flags.BoolVarP(&options.all, "all", "a", false, "Remove all unused images, not just dangling ones")
-	flags.Var(&options.filter, "filter", "Provide filter values (e.g. 'until=24h')")
+	flags.BoolVarP(&options.all, "all", "a", false, "Include internal/frontend images")
+	flags.Var(&options.filter, "filter", `Provide filter values (e.g., "until=24h")`)
 	flags.Var(&options.keepStorage, "keep-storage", "Amount of disk space to keep for cache")
 	flags.BoolVar(&options.verbose, "verbose", false, "Provide a more verbose output")
-	flags.BoolVar(&options.force, "force", false, "Skip the warning messages")
+	flags.BoolVarP(&options.force, "force", "f", false, "Do not prompt for confirmation")
 
 	return cmd
 }
@@ -156,9 +155,9 @@ func toBuildkitPruneInfo(f filters.Args) (*client.PruneInfo, error) {
 	if len(untilValues) > 0 && len(unusedForValues) > 0 {
 		return nil, errors.Errorf("conflicting filters %q and %q", "until", "unused-for")
 	}
-	filterKey := "until"
+	untilKey := "until"
 	if len(unusedForValues) > 0 {
-		filterKey = "unused-for"
+		untilKey = "unused-for"
 	}
 	untilValues = append(untilValues, unusedForValues...)
 
@@ -169,23 +168,27 @@ func toBuildkitPruneInfo(f filters.Args) (*client.PruneInfo, error) {
 		var err error
 		until, err = time.ParseDuration(untilValues[0])
 		if err != nil {
-			return nil, errors.Wrapf(err, "%q filter expects a duration (e.g., '24h')", filterKey)
+			return nil, errors.Wrapf(err, "%q filter expects a duration (e.g., '24h')", untilKey)
 		}
 	default:
 		return nil, errors.Errorf("filters expect only one value")
 	}
 
-	bkFilter := make([]string, 0, f.Len())
-	for _, field := range f.Keys() {
-		values := f.Get(field)
+	filters := make([]string, 0, f.Len())
+	for _, filterKey := range f.Keys() {
+		if filterKey == untilKey {
+			continue
+		}
+
+		values := f.Get(filterKey)
 		switch len(values) {
 		case 0:
-			bkFilter = append(bkFilter, field)
+			filters = append(filters, filterKey)
 		case 1:
-			if field == "id" {
-				bkFilter = append(bkFilter, field+"~="+values[0])
+			if filterKey == "id" {
+				filters = append(filters, filterKey+"~="+values[0])
 			} else {
-				bkFilter = append(bkFilter, field+"=="+values[0])
+				filters = append(filters, filterKey+"=="+values[0])
 			}
 		default:
 			return nil, errors.Errorf("filters expect only one value")
@@ -193,6 +196,6 @@ func toBuildkitPruneInfo(f filters.Args) (*client.PruneInfo, error) {
 	}
 	return &client.PruneInfo{
 		KeepDuration: until,
-		Filter:       []string{strings.Join(bkFilter, ",")},
+		Filter:       []string{strings.Join(filters, ",")},
 	}, nil
 }

commands/rm.go

@@ -2,51 +2,83 @@ package commands
 
 import (
 	"context"
+	"fmt"
+	"time"
 
 	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/moby/buildkit/util/appcontext"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"golang.org/x/sync/errgroup"
 )
 
 type rmOptions struct {
-	builder string
+	builder     string
+	keepState   bool
+	keepDaemon  bool
+	allInactive bool
+	force       bool
 }
 
+const (
+	rmInactiveWarning = `WARNING! This will remove all builders that are not in running state. Are you sure you want to continue?`
+)
+
 func runRm(dockerCli command.Cli, in rmOptions) error {
 	ctx := appcontext.Context()
 
-	txn, release, err := getStore(dockerCli)
+	if in.allInactive && !in.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), rmInactiveWarning) {
+		return nil
+	}
+
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
 	defer release()
 
+	if in.allInactive {
+		return rmAllInactive(ctx, txn, dockerCli, in)
+	}
+
+	var ng *store.NodeGroup
 	if in.builder != "" {
-		ng, err := getNodeGroup(txn, dockerCli, in.builder)
+		ng, err = storeutil.GetNodeGroup(txn, dockerCli, in.builder)
 		if err != nil {
 			return err
 		}
-		err1 := stop(ctx, dockerCli, ng, true)
-		if err := txn.Remove(ng.Name); err != nil {
+	} else {
+		ng, err = storeutil.GetCurrentInstance(txn, dockerCli)
+		if err != nil {
 			return err
 		}
-		return err1
+	}
+	if ng == nil {
+		return nil
 	}
 
-	ng, err := getCurrentInstance(txn, dockerCli)
+	ctxbuilders, err := dockerCli.ContextStore().List()
 	if err != nil {
 		return err
 	}
-	if ng != nil {
-		err1 := stop(ctx, dockerCli, ng, true)
-		if err := txn.Remove(ng.Name); err != nil {
-			return err
+	for _, cb := range ctxbuilders {
+		if ng.Driver == "docker" && len(ng.Nodes) == 1 && ng.Nodes[0].Endpoint == cb.Name {
+			return errors.Errorf("context builder cannot be removed, run `docker context rm %s` to remove this context", cb.Name)
 		}
+	}
+
+	err1 := rm(ctx, dockerCli, in, ng)
+	if err := txn.Remove(ng.Name); err != nil {
+		return err
+	}
+	if err1 != nil {
 		return err1
 	}
 
+	_, _ = fmt.Fprintf(dockerCli.Err(), "%s removed\n", ng.Name)
 	return nil
 }
 
@@ -60,30 +92,41 @@ func rmCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			options.builder = rootOpts.builder
 			if len(args) > 0 {
+				if options.allInactive {
+					return errors.New("cannot specify builder name when --all-inactive is set")
+				}
 				options.builder = args[0]
 			}
 			return runRm(dockerCli, options)
 		},
 	}
 
+	flags := cmd.Flags()
+	flags.BoolVar(&options.keepState, "keep-state", false, "Keep BuildKit state")
+	flags.BoolVar(&options.keepDaemon, "keep-daemon", false, "Keep the buildkitd daemon running")
+	flags.BoolVar(&options.allInactive, "all-inactive", false, "Remove all inactive builders")
+	flags.BoolVarP(&options.force, "force", "f", false, "Do not prompt for confirmation")
+
 	return cmd
 }
 
-func stop(ctx context.Context, dockerCli command.Cli, ng *store.NodeGroup, rm bool) error {
+func rm(ctx context.Context, dockerCli command.Cli, in rmOptions, ng *store.NodeGroup) error {
 	dis, err := driversForNodeGroup(ctx, dockerCli, ng, "")
 	if err != nil {
 		return err
 	}
 	for _, di := range dis {
-		if di.Driver != nil {
+		if di.Driver == nil {
+			continue
+		}
+		// Do not stop the buildkitd daemon when --keep-daemon is provided
+		if !in.keepDaemon {
 			if err := di.Driver.Stop(ctx, true); err != nil {
 				return err
 			}
-			if rm {
-				if err := di.Driver.Rm(ctx, true); err != nil {
-					return err
-				}
-			}
+		}
+		if err := di.Driver.Rm(ctx, true, !in.keepState, !in.keepDaemon); err != nil {
+			return err
 		}
 		if di.Err != nil {
 			err = di.Err
@@ -92,25 +135,42 @@ func stop(ctx context.Context, dockerCli command.Cli, ng *store.NodeGroup, rm bo
 	return err
 }
 
-func stopCurrent(ctx context.Context, dockerCli command.Cli, rm bool) error {
-	dis, err := getDefaultDrivers(ctx, dockerCli, "")
+func rmAllInactive(ctx context.Context, txn *store.Txn, dockerCli command.Cli, in rmOptions) error {
+	ctx, cancel := context.WithTimeout(ctx, 20*time.Second)
+	defer cancel()
+
+	ll, err := txn.List()
 	if err != nil {
 		return err
 	}
-	for _, di := range dis {
-		if di.Driver != nil {
-			if err := di.Driver.Stop(ctx, true); err != nil {
-				return err
-			}
-			if rm {
-				if err := di.Driver.Rm(ctx, true); err != nil {
-					return err
-				}
-			}
-		}
-		if di.Err != nil {
-			err = di.Err
-		}
+
+	builders := make([]*nginfo, len(ll))
+	for i, ng := range ll {
+		builders[i] = &nginfo{ng: ng}
 	}
-	return err
+
+	eg, _ := errgroup.WithContext(ctx)
+	for _, b := range builders {
+		func(b *nginfo) {
+			eg.Go(func() error {
+				if err := loadNodeGroupData(ctx, dockerCli, b); err != nil {
+					return errors.Wrapf(err, "cannot load %s", b.ng.Name)
+				}
+				if b.ng.Dynamic {
+					return nil
+				}
+				if b.inactive() {
+					rmerr := rm(ctx, dockerCli, in, b.ng)
+					if err := txn.Remove(b.ng.Name); err != nil {
+						return err
+					}
+					_, _ = fmt.Fprintf(dockerCli.Err(), "%s removed\n", b.ng.Name)
+					return rmerr
+				}
+				return nil
+			})
+		}(b)
+	}
+
+	return eg.Wait()
 }

commands/root.go

@@ -4,23 +4,60 @@ import (
 	"os"
 
 	imagetoolscmd "github.com/docker/buildx/commands/imagetools"
+	"github.com/docker/buildx/util/logutil"
+	"github.com/docker/cli-docs-tool/annotation"
+	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli-plugins/plugin"
 	"github.com/docker/cli/cli/command"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 )
 
 func NewRootCmd(name string, isPlugin bool, dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Short: "Build with BuildKit",
+		Short: "Docker Buildx",
+		Long:  `Extended build capabilities with BuildKit`,
 		Use:   name,
+		Annotations: map[string]string{
+			annotation.CodeDelimiter: `"`,
+		},
 	}
 	if isPlugin {
 		cmd.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
 			return plugin.PersistentPreRunE(cmd, args)
 		}
+	} else {
+		// match plugin behavior for standalone mode
+		// https://github.com/docker/cli/blob/6c9eb708fa6d17765d71965f90e1c59cea686ee9/cli-plugins/plugin/plugin.go#L117-L127
+		cmd.SilenceUsage = true
+		cmd.SilenceErrors = true
+		cmd.TraverseChildren = true
+		cmd.DisableFlagsInUseLine = true
+		cli.DisableFlagsInUseLine(cmd)
 	}
 
+	logrus.SetFormatter(&logutil.Formatter{})
+
+	logrus.AddHook(logutil.NewFilter([]logrus.Level{
+		logrus.DebugLevel,
+	},
+		"serving grpc connection",
+		"stopping session",
+		"using default config store",
+	))
+
+	// filter out useless commandConn.CloseWrite warning message that can occur
+	// when listing builder instances with "buildx ls" for those that are
+	// unreachable: "commandConn.CloseWrite: commandconn: failed to wait: signal: killed"
+	// https://github.com/docker/cli/blob/3fb4fb83dfb5db0c0753a8316f21aea54dab32c5/cli/connhelper/commandconn/commandconn.go#L203-L214
+	logrus.AddHook(logutil.NewFilter([]logrus.Level{
+		logrus.WarnLevel,
+	},
+		"commandConn.CloseWrite:",
+		"commandConn.CloseRead:",
+	))
+
 	addCommands(cmd, dockerCli)
 	return cmd
 }
@@ -47,7 +84,7 @@ func addCommands(cmd *cobra.Command, dockerCli command.Cli) {
 		versionCmd(dockerCli),
 		pruneCmd(dockerCli, opts),
 		duCmd(dockerCli, opts),
-		imagetoolscmd.RootCmd(dockerCli),
+		imagetoolscmd.RootCmd(dockerCli, imagetoolscmd.RootOptions{Builder: &opts.builder}),
 	)
 }
 

commands/stop.go

@@ -1,6 +1,10 @@
 package commands
 
 import (
+	"context"
+
+	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/moby/buildkit/util/appcontext"
@@ -14,32 +18,32 @@ type stopOptions struct {
 func runStop(dockerCli command.Cli, in stopOptions) error {
 	ctx := appcontext.Context()
 
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
 	defer release()
 
 	if in.builder != "" {
-		ng, err := getNodeGroup(txn, dockerCli, in.builder)
+		ng, err := storeutil.GetNodeGroup(txn, dockerCli, in.builder)
 		if err != nil {
 			return err
 		}
-		if err := stop(ctx, dockerCli, ng, false); err != nil {
+		if err := stop(ctx, dockerCli, ng); err != nil {
 			return err
 		}
 		return nil
 	}
 
-	ng, err := getCurrentInstance(txn, dockerCli)
+	ng, err := storeutil.GetCurrentInstance(txn, dockerCli)
 	if err != nil {
 		return err
 	}
 	if ng != nil {
-		return stop(ctx, dockerCli, ng, false)
+		return stop(ctx, dockerCli, ng)
 	}
 
-	return stopCurrent(ctx, dockerCli, false)
+	return stopCurrent(ctx, dockerCli)
 }
 
 func stopCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
@@ -58,11 +62,41 @@ func stopCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 		},
 	}
 
-	flags := cmd.Flags()
-
-	// flags.StringArrayVarP(&options.outputs, "output", "o", []string{}, "Output destination (format: type=local,dest=path)")
-
-	_ = flags
-
 	return cmd
 }
+
+func stop(ctx context.Context, dockerCli command.Cli, ng *store.NodeGroup) error {
+	dis, err := driversForNodeGroup(ctx, dockerCli, ng, "")
+	if err != nil {
+		return err
+	}
+	for _, di := range dis {
+		if di.Driver != nil {
+			if err := di.Driver.Stop(ctx, true); err != nil {
+				return err
+			}
+		}
+		if di.Err != nil {
+			err = di.Err
+		}
+	}
+	return err
+}
+
+func stopCurrent(ctx context.Context, dockerCli command.Cli) error {
+	dis, err := getDefaultDrivers(ctx, dockerCli, false, "")
+	if err != nil {
+		return err
+	}
+	for _, di := range dis {
+		if di.Driver != nil {
+			if err := di.Driver.Stop(ctx, true); err != nil {
+				return err
+			}
+		}
+		if di.Err != nil {
+			err = di.Err
+		}
+	}
+	return err
+}

commands/uninstall.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"os"
 
+	"github.com/docker/buildx/util/cobrautil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/config"
@@ -54,5 +55,8 @@ func uninstallCmd(dockerCli command.Cli) *cobra.Command {
 		Hidden: true,
 	}
 
+	// hide builder persistent flag for this command
+	cobrautil.HideInheritedFlags(cmd, "builder")
+
 	return cmd
 }

commands/use.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"os"
 
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/pkg/errors"
@@ -16,7 +17,7 @@ type useOptions struct {
 }
 
 func runUse(dockerCli command.Cli, in useOptions) error {
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return err
 	}
@@ -28,7 +29,7 @@ func runUse(dockerCli command.Cli, in useOptions) error {
 				return errors.Errorf("run `docker context use default` to switch to default context")
 			}
 			if in.builder == "default" || in.builder == dockerCli.CurrentContext() {
-				ep, err := getCurrentEndpoint(dockerCli)
+				ep, err := storeutil.GetCurrentEndpoint(dockerCli)
 				if err != nil {
 					return err
 				}
@@ -51,7 +52,7 @@ func runUse(dockerCli command.Cli, in useOptions) error {
 		return errors.Wrapf(err, "failed to find instance %q", in.builder)
 	}
 
-	ep, err := getCurrentEndpoint(dockerCli)
+	ep, err := storeutil.GetCurrentEndpoint(dockerCli)
 	if err != nil {
 		return err
 	}
@@ -79,11 +80,8 @@ func useCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	}
 
 	flags := cmd.Flags()
-
 	flags.BoolVar(&options.isGlobal, "global", false, "Builder persists context changes")
 	flags.BoolVar(&options.isDefault, "default", false, "Set builder as default for current context")
 
-	_ = flags
-
 	return cmd
 }

commands/util.go

@@ -2,71 +2,35 @@ package commands
 
 import (
 	"context"
+	"net/url"
 	"os"
-	"path/filepath"
+	"strings"
 
 	"github.com/docker/buildx/build"
 	"github.com/docker/buildx/driver"
+	ctxkube "github.com/docker/buildx/driver/kubernetes/context"
+	remoteutil "github.com/docker/buildx/driver/remote/util"
 	"github.com/docker/buildx/store"
+	"github.com/docker/buildx/store/storeutil"
 	"github.com/docker/buildx/util/platformutil"
+	"github.com/docker/buildx/util/progress"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/context/docker"
-	"github.com/docker/cli/cli/context/kubernetes"
+	ctxstore "github.com/docker/cli/cli/context/store"
 	dopts "github.com/docker/cli/opts"
 	dockerclient "github.com/docker/docker/client"
+	"github.com/moby/buildkit/util/grpcerrors"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
+	"google.golang.org/grpc/codes"
+	"k8s.io/client-go/tools/clientcmd"
 )
 
-// getStore returns current builder instance store
-func getStore(dockerCli command.Cli) (*store.Txn, func(), error) {
-	dir := filepath.Dir(dockerCli.ConfigFile().Filename)
-	s, err := store.New(dir)
-	if err != nil {
-		return nil, nil, err
-	}
-	return s.Txn()
-}
-
-// getCurrentEndpoint returns the current default endpoint value
-func getCurrentEndpoint(dockerCli command.Cli) (string, error) {
-	name := dockerCli.CurrentContext()
-	if name != "default" {
-		return name, nil
-	}
-	de, err := getDockerEndpoint(dockerCli, name)
-	if err != nil {
-		return "", errors.Errorf("docker endpoint for %q not found", name)
-	}
-	return de, nil
-}
-
-// getDockerEndpoint returns docker endpoint string for given context
-func getDockerEndpoint(dockerCli command.Cli, name string) (string, error) {
-	list, err := dockerCli.ContextStore().List()
-	if err != nil {
-		return "", err
-	}
-	for _, l := range list {
-		if l.Name == name {
-			ep, ok := l.Endpoints["docker"]
-			if !ok {
-				return "", errors.Errorf("context %q does not have a Docker endpoint", name)
-			}
-			typed, ok := ep.(docker.EndpointMeta)
-			if !ok {
-				return "", errors.Errorf("endpoint %q is not of type EndpointMeta, %T", ep, ep)
-			}
-			return typed.Host, nil
-		}
-	}
-	return "", nil
-}
-
 // validateEndpoint validates that endpoint is either a context or a docker host
 func validateEndpoint(dockerCli command.Cli, ep string) (string, error) {
-	de, err := getDockerEndpoint(dockerCli, ep)
+	de, err := storeutil.GetDockerEndpoint(dockerCli, ep)
 	if err == nil && de != "" {
 		if ep == "default" {
 			return de, nil
@@ -80,58 +44,12 @@ func validateEndpoint(dockerCli command.Cli, ep string) (string, error) {
 	return h, nil
 }
 
-// getCurrentInstance finds the current builder instance
-func getCurrentInstance(txn *store.Txn, dockerCli command.Cli) (*store.NodeGroup, error) {
-	ep, err := getCurrentEndpoint(dockerCli)
-	if err != nil {
-		return nil, err
+// validateBuildkitEndpoint validates that endpoint is a valid buildkit host
+func validateBuildkitEndpoint(ep string) (string, error) {
+	if err := remoteutil.IsValidEndpoint(ep); err != nil {
+		return "", err
 	}
-	ng, err := txn.Current(ep)
-	if err != nil {
-		return nil, err
-	}
-	if ng == nil {
-		ng, _ = getNodeGroup(txn, dockerCli, dockerCli.CurrentContext())
-	}
-
-	return ng, nil
-}
-
-// getNodeGroup returns nodegroup based on the name
-func getNodeGroup(txn *store.Txn, dockerCli command.Cli, name string) (*store.NodeGroup, error) {
-	ng, err := txn.NodeGroupByName(name)
-	if err != nil {
-		if !os.IsNotExist(errors.Cause(err)) {
-			return nil, err
-		}
-	}
-	if ng != nil {
-		return ng, nil
-	}
-
-	if name == "default" {
-		name = dockerCli.CurrentContext()
-	}
-
-	list, err := dockerCli.ContextStore().List()
-	if err != nil {
-		return nil, err
-	}
-	for _, l := range list {
-		if l.Name == name {
-			return &store.NodeGroup{
-				Name: "default",
-				Nodes: []store.Node{
-					{
-						Name:     "default",
-						Endpoint: name,
-					},
-				},
-			}, nil
-		}
-	}
-
-	return nil, errors.Errorf("no builder %q found", name)
+	return ep, nil
 }
 
 // driversForNodeGroup returns drivers for a nodegroup instance
@@ -147,27 +65,43 @@ func driversForNodeGroup(ctx context.Context, dockerCli command.Cli, ng *store.N
 			return nil, errors.Errorf("failed to find driver %q", f)
 		}
 	} else {
-		dockerapi, err := clientForEndpoint(dockerCli, ng.Nodes[0].Endpoint)
+		// empty driver means nodegroup was implicitly created as a default
+		// driver for a docker context and allows falling back to a
+		// docker-container driver for older daemon that doesn't support
+		// buildkit (< 18.06).
+		ep := ng.Nodes[0].Endpoint
+		dockerapi, err := clientForEndpoint(dockerCli, ep)
 		if err != nil {
 			return nil, err
 		}
-		f, err = driver.GetDefaultFactory(ctx, dockerapi, false)
+		// check if endpoint is healthy is needed to determine the driver type.
+		// if this fails then can't continue with driver selection.
+		if _, err = dockerapi.Ping(ctx); err != nil {
+			return nil, err
+		}
+		f, err = driver.GetDefaultFactory(ctx, ep, dockerapi, false)
 		if err != nil {
 			return nil, err
 		}
 		ng.Driver = f.Name()
 	}
+	imageopt, err := storeutil.GetImageConfig(dockerCli, ng)
+	if err != nil {
+		return nil, err
+	}
 
 	for i, n := range ng.Nodes {
 		func(i int, n store.Node) {
 			eg.Go(func() error {
 				di := build.DriverInfo{
-					Name:     n.Name,
-					Platform: n.Platforms,
+					Name:        n.Name,
+					Platform:    n.Platforms,
+					ProxyConfig: storeutil.GetProxyConfig(dockerCli),
 				}
 				defer func() {
 					dis[i] = di
 				}()
+
 				dockerapi, err := clientForEndpoint(dockerCli, n.Endpoint)
 				if err != nil {
 					di.Err = err
@@ -177,22 +111,42 @@ func driversForNodeGroup(ctx context.Context, dockerCli command.Cli, ng *store.N
 				dockerapi.NegotiateAPIVersion(ctx)
 
 				contextStore := dockerCli.ContextStore()
-				kcc, err := kubernetes.ConfigFromContext(n.Endpoint, contextStore)
+
+				var kcc driver.KubeClientConfig
+				kcc, err = configFromContext(n.Endpoint, contextStore)
 				if err != nil {
 					// err is returned if n.Endpoint is non-context name like "unix:///var/run/docker.sock".
 					// try again with name="default".
 					// FIXME: n should retain real context name.
-					kcc, err = kubernetes.ConfigFromContext("default", contextStore)
+					kcc, err = configFromContext("default", contextStore)
 					if err != nil {
 						logrus.Error(err)
 					}
 				}
-				d, err := driver.GetDriver(ctx, "buildx_buildkit_"+n.Name, f, dockerapi, kcc, n.Flags, n.ConfigFile, n.DriverOpts, contextPathHash)
+
+				tryToUseKubeConfigInCluster := false
+				if kcc == nil {
+					tryToUseKubeConfigInCluster = true
+				} else {
+					if _, err := kcc.ClientConfig(); err != nil {
+						tryToUseKubeConfigInCluster = true
+					}
+				}
+				if tryToUseKubeConfigInCluster {
+					kccInCluster := driver.KubeClientConfigInCluster{}
+					if _, err := kccInCluster.ClientConfig(); err == nil {
+						logrus.Debug("using kube config in cluster")
+						kcc = kccInCluster
+					}
+				}
+
+				d, err := driver.GetDriver(ctx, "buildx_buildkit_"+n.Name, f, n.Endpoint, dockerapi, imageopt.Auth, kcc, n.Flags, n.Files, n.DriverOpts, n.Platforms, contextPathHash)
 				if err != nil {
 					di.Err = err
 					return nil
 				}
 				di.Driver = d
+				di.ImageOpt = imageopt
 				return nil
 			})
 		}(i, n)
@@ -205,6 +159,22 @@ func driversForNodeGroup(ctx context.Context, dockerCli command.Cli, ng *store.N
 	return dis, nil
 }
 
+func configFromContext(endpointName string, s ctxstore.Reader) (clientcmd.ClientConfig, error) {
+	if strings.HasPrefix(endpointName, "kubernetes://") {
+		u, _ := url.Parse(endpointName)
+		if kubeconfig := u.Query().Get("kubeconfig"); kubeconfig != "" {
+			_ = os.Setenv(clientcmd.RecommendedConfigPathEnvVar, kubeconfig)
+		}
+		rules := clientcmd.NewDefaultClientConfigLoadingRules()
+		apiConfig, err := rules.Load()
+		if err != nil {
+			return nil, err
+		}
+		return clientcmd.NewDefaultClientConfig(*apiConfig, &clientcmd.ConfigOverrides{}), nil
+	}
+	return ctxkube.ConfigFromContext(endpointName, s)
+}
+
 // clientForEndpoint returns a docker client for an endpoint
 func clientForEndpoint(dockerCli command.Cli, name string) (dockerclient.APIClient, error) {
 	list, err := dockerCli.ContextStore().List()
@@ -248,14 +218,33 @@ func clientForEndpoint(dockerCli command.Cli, name string) (dockerclient.APIClie
 }
 
 func getInstanceOrDefault(ctx context.Context, dockerCli command.Cli, instance, contextPathHash string) ([]build.DriverInfo, error) {
+	var defaultOnly bool
+
+	if instance == "default" && instance != dockerCli.CurrentContext() {
+		return nil, errors.Errorf("use `docker --context=default buildx` to switch to default context")
+	}
+	if instance == "default" || instance == dockerCli.CurrentContext() {
+		instance = ""
+		defaultOnly = true
+	}
+	list, err := dockerCli.ContextStore().List()
+	if err != nil {
+		return nil, err
+	}
+	for _, l := range list {
+		if l.Name == instance {
+			return nil, errors.Errorf("use `docker --context=%s buildx` to switch to context %s", instance, instance)
+		}
+	}
+
 	if instance != "" {
 		return getInstanceByName(ctx, dockerCli, instance, contextPathHash)
 	}
-	return getDefaultDrivers(ctx, dockerCli, contextPathHash)
+	return getDefaultDrivers(ctx, dockerCli, defaultOnly, contextPathHash)
 }
 
 func getInstanceByName(ctx context.Context, dockerCli command.Cli, instance, contextPathHash string) ([]build.DriverInfo, error) {
-	txn, release, err := getStore(dockerCli)
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return nil, err
 	}
@@ -269,30 +258,39 @@ func getInstanceByName(ctx context.Context, dockerCli command.Cli, instance, con
 }
 
 // getDefaultDrivers returns drivers based on current cli config
-func getDefaultDrivers(ctx context.Context, dockerCli command.Cli, contextPathHash string) ([]build.DriverInfo, error) {
-	txn, release, err := getStore(dockerCli)
+func getDefaultDrivers(ctx context.Context, dockerCli command.Cli, defaultOnly bool, contextPathHash string) ([]build.DriverInfo, error) {
+	txn, release, err := storeutil.GetStore(dockerCli)
 	if err != nil {
 		return nil, err
 	}
 	defer release()
 
-	ng, err := getCurrentInstance(txn, dockerCli)
+	if !defaultOnly {
+		ng, err := storeutil.GetCurrentInstance(txn, dockerCli)
+		if err != nil {
+			return nil, err
+		}
+
+		if ng != nil {
+			return driversForNodeGroup(ctx, dockerCli, ng, contextPathHash)
+		}
+	}
+
+	imageopt, err := storeutil.GetImageConfig(dockerCli, nil)
 	if err != nil {
 		return nil, err
 	}
 
-	if ng != nil {
-		return driversForNodeGroup(ctx, dockerCli, ng, contextPathHash)
-	}
-
-	d, err := driver.GetDriver(ctx, "buildx_buildkit_default", nil, dockerCli.Client(), nil, nil, "", nil, contextPathHash)
+	d, err := driver.GetDriver(ctx, "buildx_buildkit_default", nil, "", dockerCli.Client(), imageopt.Auth, nil, nil, nil, nil, nil, contextPathHash)
 	if err != nil {
 		return nil, err
 	}
 	return []build.DriverInfo{
 		{
-			Name:   "default",
-			Driver: d,
+			Name:        "default",
+			Driver:      d,
+			ImageOpt:    imageopt,
+			ProxyConfig: storeutil.GetProxyConfig(dockerCli),
 		},
 	}, nil
 }
@@ -316,11 +314,20 @@ func loadInfoData(ctx context.Context, d *dinfo) error {
 			return errors.Wrap(err, "listing workers")
 		}
 		for _, w := range workers {
-			for _, p := range w.Platforms {
-				d.platforms = append(d.platforms, p)
-			}
+			d.platforms = append(d.platforms, w.Platforms...)
 		}
 		d.platforms = platformutil.Dedupe(d.platforms)
+		inf, err := c.Info(ctx)
+		if err != nil {
+			if st, ok := grpcerrors.AsGRPCStatus(err); ok && st.Code() == codes.Unimplemented {
+				d.version, err = d.di.Driver.Version(ctx)
+				if err != nil {
+					return errors.Wrap(err, "getting version")
+				}
+			}
+		} else {
+			d.version = inf.BuildkitVersion.Version
+		}
 	}
 	return nil
 }
@@ -349,29 +356,55 @@ func loadNodeGroupData(ctx context.Context, dockerCli command.Cli, ngi *nginfo)
 	if eg.Wait(); err != nil {
 		return err
 	}
+
+	kubernetesDriverCount := 0
+
 	for _, di := range ngi.drivers {
-		// dynamic nodes are used in Kubernetes driver.
-		// Kubernetes pods are dynamically mapped to BuildKit Nodes.
 		if di.info != nil && len(di.info.DynamicNodes) > 0 {
-			var drivers []dinfo
-			for i := 0; i < len(di.info.DynamicNodes); i++ {
-				// all []dinfo share *build.DriverInfo and *driver.Info
-				diClone := di
-				if pl := di.info.DynamicNodes[i].Platforms; len(pl) > 0 {
-					diClone.platforms = pl
-				}
-				drivers = append(drivers, di)
-			}
-			// not append (remove the static nodes in the store)
-			ngi.ng.Nodes = di.info.DynamicNodes
-			ngi.ng.Dynamic = true
-			ngi.drivers = drivers
-			return nil
+			kubernetesDriverCount++
 		}
 	}
+
+	isAllKubernetesDrivers := len(ngi.drivers) == kubernetesDriverCount
+
+	if isAllKubernetesDrivers {
+		var drivers []dinfo
+		var dynamicNodes []store.Node
+
+		for _, di := range ngi.drivers {
+			// dynamic nodes are used in Kubernetes driver.
+			// Kubernetes pods are dynamically mapped to BuildKit Nodes.
+			if di.info != nil && len(di.info.DynamicNodes) > 0 {
+				for i := 0; i < len(di.info.DynamicNodes); i++ {
+					// all []dinfo share *build.DriverInfo and *driver.Info
+					diClone := di
+					if pl := di.info.DynamicNodes[i].Platforms; len(pl) > 0 {
+						diClone.platforms = pl
+					}
+					drivers = append(drivers, di)
+				}
+				dynamicNodes = append(dynamicNodes, di.info.DynamicNodes...)
+			}
+		}
+
+		// not append (remove the static nodes in the store)
+		ngi.ng.Nodes = dynamicNodes
+		ngi.drivers = drivers
+		ngi.ng.Dynamic = true
+	}
+
 	return nil
 }
 
+func hasNodeGroup(list []*nginfo, ngi *nginfo) bool {
+	for _, l := range list {
+		if ngi.ng.Name == l.ng.Name {
+			return true
+		}
+	}
+	return false
+}
+
 func dockerAPI(dockerCli command.Cli) *api {
 	return &api{dockerCli: dockerCli}
 }
@@ -386,3 +419,68 @@ func (a *api) DockerAPI(name string) (dockerclient.APIClient, error) {
 	}
 	return clientForEndpoint(a.dockerCli, name)
 }
+
+type dinfo struct {
+	di        *build.DriverInfo
+	info      *driver.Info
+	platforms []specs.Platform
+	version   string
+	err       error
+}
+
+type nginfo struct {
+	ng      *store.NodeGroup
+	drivers []dinfo
+	err     error
+}
+
+// inactive checks if all nodes are inactive for this builder
+func (n *nginfo) inactive() bool {
+	for idx := range n.ng.Nodes {
+		d := n.drivers[idx]
+		if d.info != nil && d.info.Status == driver.Running {
+			return false
+		}
+	}
+	return true
+}
+
+func boot(ctx context.Context, ngi *nginfo) (bool, error) {
+	toBoot := make([]int, 0, len(ngi.drivers))
+	for i, d := range ngi.drivers {
+		if d.err != nil || d.di.Err != nil || d.di.Driver == nil || d.info == nil {
+			continue
+		}
+		if d.info.Status != driver.Running {
+			toBoot = append(toBoot, i)
+		}
+	}
+	if len(toBoot) == 0 {
+		return false, nil
+	}
+
+	printer := progress.NewPrinter(context.TODO(), os.Stderr, os.Stderr, "auto")
+
+	baseCtx := ctx
+	eg, _ := errgroup.WithContext(ctx)
+	for _, idx := range toBoot {
+		func(idx int) {
+			eg.Go(func() error {
+				pw := progress.WithPrefix(printer, ngi.ng.Nodes[idx].Name, len(toBoot) > 1)
+				_, err := driver.Boot(ctx, baseCtx, ngi.drivers[idx].di.Driver, pw)
+				if err != nil {
+					ngi.drivers[idx].err = err
+				}
+				return nil
+			})
+		}(idx)
+	}
+
+	err := eg.Wait()
+	err1 := printer.Wait()
+	if err == nil {
+		err = err1
+	}
+
+	return true, err
+}

commands/version.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"fmt"
 
+	"github.com/docker/buildx/util/cobrautil"
 	"github.com/docker/buildx/version"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -17,11 +18,15 @@ func runVersion(dockerCli command.Cli) error {
 func versionCmd(dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "version",
-		Short: "Show buildx version information ",
+		Short: "Show buildx version information",
 		Args:  cli.ExactArgs(0),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runVersion(dockerCli)
 		},
 	}
+
+	// hide builder persistent flag for this command
+	cobrautil.HideInheritedFlags(cmd, "builder")
+
 	return cmd
 }

docker-bake.hcl

@@ -0,0 +1,145 @@
+variable "GO_VERSION" {
+  default = "1.18"
+}
+variable "BIN_OUT" {
+  default = "./bin"
+}
+variable "RELEASE_OUT" {
+  default = "./release-out"
+}
+variable "DOCS_FORMATS" {
+  default = "md"
+}
+
+// Special target: https://github.com/docker/metadata-action#bake-definition
+target "meta-helper" {
+  tags = ["docker/buildx-bin:local"]
+}
+
+target "_common" {
+  args = {
+    GO_VERSION = GO_VERSION
+    BUILDKIT_CONTEXT_KEEP_GIT_DIR = 1
+  }
+}
+
+group "default" {
+  targets = ["binaries"]
+}
+
+group "validate" {
+  targets = ["lint", "validate-vendor", "validate-docs"]
+}
+
+target "lint" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/lint.Dockerfile"
+  output = ["type=cacheonly"]
+}
+
+target "validate-vendor" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/vendor.Dockerfile"
+  target = "validate"
+  output = ["type=cacheonly"]
+}
+
+target "validate-docs" {
+  inherits = ["_common"]
+  args = {
+    FORMATS = DOCS_FORMATS
+  }
+  dockerfile = "./hack/dockerfiles/docs.Dockerfile"
+  target = "validate"
+  output = ["type=cacheonly"]
+}
+
+target "validate-authors" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/authors.Dockerfile"
+  target = "validate"
+  output = ["type=cacheonly"]
+}
+
+target "update-vendor" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/vendor.Dockerfile"
+  target = "update"
+  output = ["."]
+}
+
+target "update-docs" {
+  inherits = ["_common"]
+  args = {
+    FORMATS = DOCS_FORMATS
+  }
+  dockerfile = "./hack/dockerfiles/docs.Dockerfile"
+  target = "update"
+  output = ["./docs/reference"]
+}
+
+target "update-authors" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/authors.Dockerfile"
+  target = "update"
+  output = ["."]
+}
+
+target "mod-outdated" {
+  inherits = ["_common"]
+  dockerfile = "./hack/dockerfiles/vendor.Dockerfile"
+  target = "outdated"
+  no-cache-filter = ["outdated"]
+  output = ["type=cacheonly"]
+}
+
+target "test" {
+  inherits = ["_common"]
+  target = "test-coverage"
+  output = ["./coverage"]
+}
+
+target "binaries" {
+  inherits = ["_common"]
+  target = "binaries"
+  output = [BIN_OUT]
+  platforms = ["local"]
+}
+
+target "binaries-cross" {
+  inherits = ["binaries"]
+  platforms = [
+    "darwin/amd64",
+    "darwin/arm64",
+    "linux/amd64",
+    "linux/arm/v6",
+    "linux/arm/v7",
+    "linux/arm64",
+    "linux/ppc64le",
+    "linux/riscv64",
+    "linux/s390x",
+    "windows/amd64",
+    "windows/arm64"
+  ]
+}
+
+target "release" {
+  inherits = ["binaries-cross"]
+  target = "release"
+  output = [RELEASE_OUT]
+}
+
+target "image" {
+  inherits = ["meta-helper", "binaries"]
+  output = ["type=image"]
+}
+
+target "image-cross" {
+  inherits = ["meta-helper", "binaries-cross"]
+  output = ["type=image"]
+}
+
+target "image-local" {
+  inherits = ["image"]
+  output = ["type=docker"]
+}

docs/generate.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/docker/buildx/commands"
+	clidocstool "github.com/docker/cli-docs-tool"
+	"github.com/docker/cli/cli/command"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+
+	// import drivers otherwise factories are empty
+	// for --driver output flag usage
+	_ "github.com/docker/buildx/driver/docker"
+	_ "github.com/docker/buildx/driver/docker-container"
+	_ "github.com/docker/buildx/driver/kubernetes"
+	_ "github.com/docker/buildx/driver/remote"
+)
+
+const defaultSourcePath = "docs/reference/"
+
+type options struct {
+	source  string
+	formats []string
+}
+
+func gen(opts *options) error {
+	log.SetFlags(0)
+
+	dockerCLI, err := command.NewDockerCli()
+	if err != nil {
+		return err
+	}
+	cmd := &cobra.Command{
+		Use:               "docker [OPTIONS] COMMAND [ARG...]",
+		Short:             "The base command for the Docker CLI.",
+		DisableAutoGenTag: true,
+	}
+
+	cmd.AddCommand(commands.NewRootCmd("buildx", true, dockerCLI))
+
+	c, err := clidocstool.New(clidocstool.Options{
+		Root:      cmd,
+		SourceDir: opts.source,
+		Plugin:    true,
+	})
+	if err != nil {
+		return err
+	}
+
+	for _, format := range opts.formats {
+		switch format {
+		case "md":
+			if err = c.GenMarkdownTree(cmd); err != nil {
+				return err
+			}
+		case "yaml":
+			if err = c.GenYamlTree(cmd); err != nil {
+				return err
+			}
+		default:
+			return errors.Errorf("unknown format %q", format)
+		}
+	}
+
+	return nil
+}
+
+func run() error {
+	opts := &options{}
+	flags := pflag.NewFlagSet(os.Args[0], pflag.ContinueOnError)
+	flags.StringVar(&opts.source, "source", defaultSourcePath, "Docs source folder")
+	flags.StringSliceVar(&opts.formats, "formats", []string{}, "Format (md, yaml)")
+	if err := flags.Parse(os.Args[1:]); err != nil {
+		return err
+	}
+	if len(opts.formats) == 0 {
+		return errors.New("Docs format required")
+	}
+	return gen(opts)
+}
+
+func main() {
+	if err := run(); err != nil {
+		log.Printf("ERROR: %+v", err)
+		os.Exit(1)
+	}
+}

docs/guides/bake/build-contexts.md

@@ -0,0 +1,74 @@
+# Defining additional build contexts and linking targets
+
+In addition to the main `context` key that defines the build context each target
+can also define additional named contexts with a map defined with key `contexts`.
+These values map to the `--build-context` flag in the [build command](https://docs.docker.com/engine/reference/commandline/buildx_build/#build-context).
+
+Inside the Dockerfile these contexts can be used with the `FROM` instruction or `--from` flag.
+
+The value can be a local source directory, container image (with `docker-image://` prefix),
+Git URL, HTTP URL or a name of another target in the Bake file (with `target:` prefix).
+
+## Pinning alpine image
+
+```dockerfile
+# syntax=docker/dockerfile:1
+FROM alpine
+RUN echo "Hello world"
+```
+
+```hcl
+# docker-bake.hcl
+target "app" {
+  contexts = {
+    alpine = "docker-image://alpine:3.13"
+  }
+}
+```
+
+## Using a secondary source directory
+
+```dockerfile
+# syntax=docker/dockerfile:1
+FROM scratch AS src
+
+FROM golang
+COPY --from=src . .
+```
+
+```hcl
+# docker-bake.hcl
+target "app" {
+  contexts = {
+    src = "../path/to/source"
+  }
+}
+```
+
+## Using a result of one target as a base image in another target
+
+To use a result of one target as a build context of another, specity the target
+name with `target:` prefix.
+
+```dockerfile
+# syntax=docker/dockerfile:1
+FROM baseapp
+RUN echo "Hello world"
+```
+
+```hcl
+# docker-bake.hcl
+target "base" {
+  dockerfile = "baseapp.Dockerfile"
+}
+
+target "app" {
+  contexts = {
+    baseapp = "target:base"
+  }
+}
+```
+
+Please note that in most cases you should just use a single multi-stage
+Dockerfile with multiple targets for similar behavior. This case is recommended
+when you have multiple Dockerfiles that can't be easily merged into one.

docs/guides/bake/compose-file.md

@@ -0,0 +1,270 @@
+# Building from Compose file
+
+## Specification
+
+Bake uses the [compose-spec](https://docs.docker.com/compose/compose-file/) to
+parse a compose file and translate each service to a [target](file-definition.md#target).
+
+```yaml
+# docker-compose.yml
+services:
+  webapp-dev: 
+    build: &build-dev
+      dockerfile: Dockerfile.webapp
+      tags:
+        - docker.io/username/webapp:latest
+      cache_from:
+        - docker.io/username/webapp:cache
+      cache_to:
+        - docker.io/username/webapp:cache
+
+  webapp-release:
+    build:
+      <<: *build-dev
+      x-bake:
+        platforms:
+          - linux/amd64
+          - linux/arm64
+
+  db:
+    image: docker.io/username/db
+    build:
+      dockerfile: Dockerfile.db
+```
+
+```console
+$ docker buildx bake --print
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "db",
+        "webapp-dev",
+        "webapp-release"
+      ]
+    }
+  },
+  "target": {
+    "db": {
+      "context": ".",
+      "dockerfile": "Dockerfile.db",
+      "tags": [
+        "docker.io/username/db"
+      ]
+    },
+    "webapp-dev": {
+      "context": ".",
+      "dockerfile": "Dockerfile.webapp",
+      "tags": [
+        "docker.io/username/webapp:latest"
+      ],
+      "cache-from": [
+        "docker.io/username/webapp:cache"
+      ],
+      "cache-to": [
+        "docker.io/username/webapp:cache"
+      ]
+    },
+    "webapp-release": {
+      "context": ".",
+      "dockerfile": "Dockerfile.webapp",
+      "tags": [
+        "docker.io/username/webapp:latest"
+      ],
+      "cache-from": [
+        "docker.io/username/webapp:cache"
+      ],
+      "cache-to": [
+        "docker.io/username/webapp:cache"
+      ],
+      "platforms": [
+        "linux/amd64",
+        "linux/arm64"
+      ]
+    }
+  }
+}
+```
+
+Unlike the [HCL format](file-definition.md#hcl-definition), there are some
+limitations with the compose format:
+
+* Specifying variables or global scope attributes is not yet supported
+* `inherits` service field is not supported, but you can use [YAML anchors](https://docs.docker.com/compose/compose-file/#fragments) to reference other services like the example above
+
+## `.env` file
+
+You can declare default environment variables in an environment file named
+`.env`. This file will be loaded from the current working directory,
+where the command is executed and applied to compose definitions passed
+with `-f`.
+
+```yaml
+# docker-compose.yml
+services:
+  webapp:
+    image: docker.io/username/webapp:${TAG:-v1.0.0}
+    build:
+      dockerfile: Dockerfile
+```
+
+```
+# .env
+TAG=v1.1.0
+```
+
+```console
+$ docker buildx bake --print
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "docker.io/username/webapp:v1.1.0"
+      ]
+    }
+  }
+}
+```
+
+> **Note**
+>
+> System environment variables take precedence over environment variables
+> in `.env` file.
+
+## Extension field with `x-bake`
+
+Even if some fields are not (yet) available in the compose specification, you
+can use the [special extension](https://docs.docker.com/compose/compose-file/#extension)
+field `x-bake` in your compose file to evaluate extra fields:
+
+```yaml
+# docker-compose.yml
+services:
+  addon:
+    image: ct-addon:bar
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+      args:
+        CT_ECR: foo
+        CT_TAG: bar
+      x-bake:
+        tags:
+          - ct-addon:foo
+          - ct-addon:alp
+        platforms:
+          - linux/amd64
+          - linux/arm64
+        cache-from:
+          - user/app:cache
+          - type=local,src=path/to/cache
+        cache-to:
+          - type=local,dest=path/to/cache
+        pull: true
+
+  aws:
+    image: ct-fake-aws:bar
+    build:
+      dockerfile: ./aws.Dockerfile
+      args:
+        CT_ECR: foo
+        CT_TAG: bar
+      x-bake:
+        secret:
+          - id=mysecret,src=./secret
+          - id=mysecret2,src=./secret2
+        platforms: linux/arm64
+        output: type=docker
+        no-cache: true
+```
+
+```console
+$ docker buildx bake --print
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "aws",
+        "addon"
+      ]
+    }
+  },
+  "target": {
+    "addon": {
+      "context": ".",
+      "dockerfile": "./Dockerfile",
+      "args": {
+        "CT_ECR": "foo",
+        "CT_TAG": "bar"
+      },
+      "tags": [
+        "ct-addon:foo",
+        "ct-addon:alp"
+      ],
+      "cache-from": [
+        "user/app:cache",
+        "type=local,src=path/to/cache"
+      ],
+      "cache-to": [
+        "type=local,dest=path/to/cache"
+      ],
+      "platforms": [
+        "linux/amd64",
+        "linux/arm64"
+      ],
+      "pull": true
+    },
+    "aws": {
+      "context": ".",
+      "dockerfile": "./aws.Dockerfile",
+      "args": {
+        "CT_ECR": "foo",
+        "CT_TAG": "bar"
+      },
+      "tags": [
+        "ct-fake-aws:bar"
+      ],
+      "secret": [
+        "id=mysecret,src=./secret",
+        "id=mysecret2,src=./secret2"
+      ],
+      "platforms": [
+        "linux/arm64"
+      ],
+      "output": [
+        "type=docker"
+      ],
+      "no-cache": true
+    }
+  }
+}
+```
+
+Complete list of valid fields for `x-bake`:
+
+* `cache-from`
+* `cache-to`
+* `contexts`
+* `no-cache`
+* `no-cache-filter`
+* `output`
+* `platforms`
+* `pull`
+* `secret`
+* `ssh`
+* `tags`

docs/guides/bake/configuring-build.md

@@ -0,0 +1,216 @@
+# Configuring builds
+
+Bake supports loading build definition from files, but sometimes you need even
+more flexibility to configure this definition.
+
+For this use case, you can define variables inside the bake files that can be
+set by the user with environment variables or by [attribute definitions](#global-scope-attributes)
+in other bake files. If you wish to change a specific value for a single
+invocation you can use the `--set` flag [from the command line](#from-command-line).
+
+## Global scope attributes
+
+You can define global scope attributes in HCL/JSON and use them for code reuse
+and setting values for variables. This means you can do a "data-only" HCL file
+with the values you want to set/override and use it in the list of regular
+output files.
+
+```hcl
+# docker-bake.hcl
+variable "FOO" {
+  default = "abc"
+}
+
+target "app" {
+  args = {
+    v1 = "pre-${FOO}"
+  }
+}
+```
+
+You can use this file directly:
+
+```console
+$ docker buildx bake --print app
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "app"
+      ]
+    }
+  },
+  "target": {
+    "app": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "v1": "pre-abc"
+      }
+    }
+  }
+}
+```
+
+Or create an override configuration file:
+
+```hcl
+# env.hcl
+WHOAMI="myuser"
+FOO="def-${WHOAMI}"
+```
+
+And invoke bake together with both of the files:
+
+```console
+$ docker buildx bake -f docker-bake.hcl -f env.hcl --print app
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "app"
+      ]
+    }
+  },
+  "target": {
+    "app": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "v1": "pre-def-myuser"
+      }
+    }
+  }
+}
+```
+
+## From command line
+
+You can also override target configurations from the command line with the
+[`--set` flag](https://docs.docker.com/engine/reference/commandline/buildx_bake/#set):
+
+```hcl
+# docker-bake.hcl
+target "app" {
+  args = {
+    mybuildarg = "foo"
+  }
+}
+```
+
+```console
+$ docker buildx bake --set app.args.mybuildarg=bar --set app.platform=linux/arm64 app --print
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "app"
+      ]
+    }
+  },
+  "target": {
+    "app": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "mybuildarg": "bar"
+      },
+      "platforms": [
+        "linux/arm64"
+      ]
+    }
+  }
+}
+```
+
+Pattern matching syntax defined in [https://golang.org/pkg/path/#Match](https://golang.org/pkg/path/#Match)
+is also supported:
+
+```console
+$ docker buildx bake --set foo*.args.mybuildarg=value  # overrides build arg for all targets starting with "foo"
+$ docker buildx bake --set *.platform=linux/arm64      # overrides platform for all targets
+$ docker buildx bake --set foo*.no-cache               # bypass caching only for targets starting with "foo"
+```
+
+Complete list of overridable fields:
+
+* `args`
+* `cache-from`
+* `cache-to`
+* `context`
+* `dockerfile`
+* `labels`
+* `no-cache`
+* `output`
+* `platform`
+* `pull`
+* `secrets`
+* `ssh`
+* `tags`
+* `target`
+
+## Using variables in variables across files
+
+When multiple files are specified, one file can use variables defined in
+another file.
+
+```hcl
+# docker-bake1.hcl
+variable "FOO" {
+  default = upper("${BASE}def")
+}
+
+variable "BAR" {
+  default = "-${FOO}-"
+}
+
+target "app" {
+  args = {
+    v1 = "pre-${BAR}"
+  }
+}
+```
+
+```hcl
+# docker-bake2.hcl
+variable "BASE" {
+  default = "abc"
+}
+
+target "app" {
+  args = {
+    v2 = "${FOO}-post"
+  }
+}
+```
+
+```console
+$ docker buildx bake -f docker-bake1.hcl -f docker-bake2.hcl --print app
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "app"
+      ]
+    }
+  },
+  "target": {
+    "app": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "v1": "pre--ABCDEF-",
+        "v2": "ABCDEF-post"
+      }
+    }
+  }
+}
+```

docs/guides/bake/file-definition.md

@@ -0,0 +1,440 @@
+# Bake file definition
+
+`buildx bake` supports HCL, JSON and Compose file format for defining build
+[groups](#group), [targets](#target) as well as [variables](#variable) and
+[functions](#functions). It looks for build definition files in the current
+directory in the following order:
+
+* `docker-compose.yml`
+* `docker-compose.yaml`
+* `docker-bake.json`
+* `docker-bake.override.json`
+* `docker-bake.hcl`
+* `docker-bake.override.hcl`
+
+## Specification
+
+Inside a bake file you can declare group, target and variable blocks to define
+project specific reusable build flows.
+
+### Target
+
+A target reflects a single docker build invocation with the same options that
+you would specify for `docker build`:
+
+```hcl
+# docker-bake.hcl
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+}
+```
+```console
+$ docker buildx bake webapp-dev
+```
+
+> **Note**
+>
+> In the case of compose files, each service corresponds to a target.
+> If compose service name contains a dot it will be replaced with an underscore.
+
+Complete list of valid target fields available for [HCL](#hcl-definition) and
+[JSON](#json-definition) definitions:
+
+| Name                | Type   | Description                                                                                                                                     |
+|---------------------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------|
+| `inherits`          | List   | [Inherit build options](#merging-and-inheritance) from other targets                                                                            |
+| `args`              | Map    | Set build-time variables (same as [`--build-arg` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                     |
+| `cache-from`        | List   | External cache sources (same as [`--cache-from` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                      |
+| `cache-to`          | List   | Cache export destinations (same as [`--cache-to` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                     |
+| `context`           | String | Set of files located in the specified path or URL                                                                                               |
+| `contexts`          | Map    | Additional build contexts (same as [`--build-context` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                |
+| `dockerfile`        | String | Name of the Dockerfile (same as [`--file` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                            |
+| `dockerfile-inline` | String | Inline Dockerfile content                                                                                                                       |
+| `labels`            | Map    | Set metadata for an image (same as [`--label` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                        |
+| `no-cache`          | Bool   | Do not use cache when building the image (same as [`--no-cache` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))      |
+| `no-cache-filter`   | List   | Do not cache specified stages (same as [`--no-cache-filter` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))          |
+| `output`            | List   | Output destination (same as [`--output` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                              |
+| `platforms`         | List   | Set target platforms for build (same as [`--platform` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                |
+| `pull`              | Bool   | Always attempt to pull all referenced images (same as [`--pull` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))      |
+| `secret`            | List   | Secret to expose to the build (same as [`--secret` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))                   |
+| `ssh`               | List   | SSH agent socket or keys to expose to the build (same as [`--ssh` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))    |
+| `tags`              | List   | Name and optionally a tag in the format `name:tag` (same as [`--tag` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/)) |
+| `target`            | String | Set the target build stage to build (same as [`--target` flag](https://docs.docker.com/engine/reference/commandline/buildx_build/))             |
+
+### Group
+
+A group is a grouping of targets:
+
+```hcl
+# docker-bake.hcl
+group "build" {
+  targets = ["db", "webapp-dev"]
+}
+
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+}
+
+target "db" {
+  dockerfile = "Dockerfile.db"
+  tags = ["docker.io/username/db"]
+}
+```
+```console
+$ docker buildx bake build
+```
+
+### Variable
+
+Similar to how Terraform provides a way to [define variables](https://www.terraform.io/docs/configuration/variables.html#declaring-an-input-variable),
+the HCL file format also supports variable block definitions. These can be used
+to define variables with values provided by the current environment, or a
+default value when unset:
+
+```hcl
+# docker-bake.hcl
+variable "TAG" {
+  default = "latest"
+}
+
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:${TAG}"]
+}
+```
+```console
+$ docker buildx bake webapp-dev          # will use the default value "latest"
+$ TAG=dev docker buildx bake webapp-dev  # will use the TAG environment variable value
+```
+
+> **Tip**
+>
+> See also the [Configuring builds](configuring-build.md) page for advanced usage.
+
+### Functions
+
+A [set of generally useful functions](https://github.com/docker/buildx/blob/master/bake/hclparser/stdlib.go)
+provided by [go-cty](https://github.com/zclconf/go-cty/tree/main/cty/function/stdlib)
+are available for use in HCL files:
+
+```hcl
+# docker-bake.hcl
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+  args = {
+    buildno = "${add(123, 1)}"
+  }
+}
+```
+
+In addition, [user defined functions](https://github.com/hashicorp/hcl/tree/main/ext/userfunc)
+are also supported:
+
+```hcl
+# docker-bake.hcl
+function "increment" {
+  params = [number]
+  result = number + 1
+}
+
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+  args = {
+    buildno = "${increment(123)}"
+  }
+}
+```
+
+> **Note**
+>
+> See [User defined HCL functions](hcl-funcs.md) page for more details.
+
+## Built-in variables
+
+* `BAKE_CMD_CONTEXT` can be used to access the main `context` for bake command
+  from a bake file that has been [imported remotely](file-definition.md#remote-definition).
+* `BAKE_LOCAL_PLATFORM` returns the current platform's default platform
+  specification (e.g. `linux/amd64`).
+
+## Merging and inheritance
+
+Multiple files can include the same target and final build options will be
+determined by merging them together:
+
+```hcl
+# docker-bake.hcl
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+}
+```
+```hcl
+# docker-bake2.hcl
+target "webapp-dev" {
+  tags = ["docker.io/username/webapp:dev"]
+}
+```
+```console
+$ docker buildx bake -f docker-bake.hcl -f docker-bake2.hcl webapp-dev
+```
+
+A group can specify its list of targets with the `targets` option. A target can
+inherit build options by setting the `inherits` option to the list of targets or
+groups to inherit from:
+
+```hcl
+# docker-bake.hcl
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:${TAG}"]
+}
+
+target "webapp-release" {
+  inherits = ["webapp-dev"]
+  platforms = ["linux/amd64", "linux/arm64"]
+}
+```
+
+## `default` target/group
+
+When you invoke `bake` you specify what targets/groups you want to build. If no
+arguments is specified, the group/target named `default` will be built:
+
+```hcl
+# docker-bake.hcl
+target "default" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:latest"]
+}
+```
+```console
+$ docker buildx bake
+```
+
+## Definitions
+
+### HCL definition
+
+HCL definition file is recommended as its experience is more aligned with buildx UX
+and also allows better code reuse, different target groups and extended features.
+
+```hcl
+# docker-bake.hcl
+variable "TAG" {
+  default = "latest"
+}
+
+group "default" {
+  targets = ["db", "webapp-dev"]
+}
+
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp:${TAG}"]
+}
+
+target "webapp-release" {
+  inherits = ["webapp-dev"]
+  platforms = ["linux/amd64", "linux/arm64"]
+}
+
+target "db" {
+  dockerfile = "Dockerfile.db"
+  tags = ["docker.io/username/db"]
+}
+```
+
+### JSON definition
+
+```json
+{
+  "variable": {
+    "TAG": {
+      "default": "latest"
+    }
+  },
+  "group": {
+    "default": {
+      "targets": [
+        "db",
+        "webapp-dev"
+      ]
+    }
+  },
+  "target": {
+    "webapp-dev": {
+      "dockerfile": "Dockerfile.webapp",
+      "tags": [
+        "docker.io/username/webapp:${TAG}"
+      ]
+    },
+    "webapp-release": {
+      "inherits": [
+        "webapp-dev"
+      ],
+      "platforms": [
+        "linux/amd64",
+        "linux/arm64"
+      ]
+    },
+    "db": {
+      "dockerfile": "Dockerfile.db",
+      "tags": [
+        "docker.io/username/db"
+      ]
+    }
+  }
+}
+```
+
+### Compose file
+
+```yaml
+# docker-compose.yml
+services:
+  webapp:
+    image: docker.io/username/webapp:latest
+    build:
+      dockerfile: Dockerfile.webapp
+
+  db:
+    image: docker.io/username/db
+    build:
+      dockerfile: Dockerfile.db
+```
+
+> **Note**
+>
+> See [Building from Compose file](compose-file.md) page for more details.
+
+## Remote definition
+
+You can also build bake files directly from a remote Git repository or HTTPS URL:
+
+```console
+$ docker buildx bake "https://github.com/docker/cli.git#v20.10.11" --print
+#1 [internal] load git source https://github.com/docker/cli.git#v20.10.11
+#1 0.745 e8f1871b077b64bcb4a13334b7146492773769f7       refs/tags/v20.10.11
+#1 2.022 From https://github.com/docker/cli
+#1 2.022  * [new tag]         v20.10.11  -> v20.10.11
+#1 DONE 2.9s
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "binary"
+      ]
+    }
+  },
+  "target": {
+    "binary": {
+      "context": "https://github.com/docker/cli.git#v20.10.11",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "BASE_VARIANT": "alpine",
+        "GO_STRIP": "",
+        "VERSION": ""
+      },
+      "target": "binary",
+      "platforms": [
+        "local"
+      ],
+      "output": [
+        "build"
+      ]
+    }
+  }
+}
+```
+
+As you can see the context is fixed to `https://github.com/docker/cli.git` even if
+[no context is actually defined](https://github.com/docker/cli/blob/2776a6d694f988c0c1df61cad4bfac0f54e481c8/docker-bake.hcl#L17-L26)
+in the definition.
+
+If you want to access the main context for bake command from a bake file
+that has been imported remotely, you can use the [`BAKE_CMD_CONTEXT` built-in var](#built-in-variables).
+
+```console
+$ cat https://raw.githubusercontent.com/tonistiigi/buildx/remote-test/docker-bake.hcl
+```
+```hcl
+target "default" {
+  context = BAKE_CMD_CONTEXT
+  dockerfile-inline = <<EOT
+FROM alpine
+WORKDIR /src
+COPY . .
+RUN ls -l && stop
+EOT
+}
+```
+
+```console
+$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" --print
+```
+```json
+{
+  "target": {
+    "default": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "dockerfile-inline": "FROM alpine\nWORKDIR /src\nCOPY . .\nRUN ls -l \u0026\u0026 stop\n"
+    }
+  }
+}
+```
+
+```console
+$ touch foo bar
+$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test"
+```
+```text
+...
+ > [4/4] RUN ls -l && stop:
+#8 0.101 total 0
+#8 0.102 -rw-r--r--    1 root     root             0 Jul 27 18:47 bar
+#8 0.102 -rw-r--r--    1 root     root             0 Jul 27 18:47 foo
+#8 0.102 /bin/sh: stop: not found
+```
+
+```console
+$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" "https://github.com/docker/cli.git#v20.10.11" --print
+#1 [internal] load git source https://github.com/tonistiigi/buildx.git#remote-test
+#1 0.429 577303add004dd7efeb13434d69ea030d35f7888       refs/heads/remote-test
+#1 CACHED
+```
+```json
+{
+  "target": {
+    "default": {
+      "context": "https://github.com/docker/cli.git#v20.10.11",
+      "dockerfile": "Dockerfile",
+      "dockerfile-inline": "FROM alpine\nWORKDIR /src\nCOPY . .\nRUN ls -l \u0026\u0026 stop\n"
+    }
+  }
+}
+```
+
+```console
+$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" "https://github.com/docker/cli.git#v20.10.11"
+```
+```text
+...
+ > [4/4] RUN ls -l && stop:
+#8 0.136 drwxrwxrwx    5 root     root          4096 Jul 27 18:31 kubernetes
+#8 0.136 drwxrwxrwx    3 root     root          4096 Jul 27 18:31 man
+#8 0.136 drwxrwxrwx    2 root     root          4096 Jul 27 18:31 opts
+#8 0.136 -rw-rw-rw-    1 root     root          1893 Jul 27 18:31 poule.yml
+#8 0.136 drwxrwxrwx    7 root     root          4096 Jul 27 18:31 scripts
+#8 0.136 drwxrwxrwx    3 root     root          4096 Jul 27 18:31 service
+#8 0.136 drwxrwxrwx    2 root     root          4096 Jul 27 18:31 templates
+#8 0.136 drwxrwxrwx   10 root     root          4096 Jul 27 18:31 vendor
+#8 0.136 -rwxrwxrwx    1 root     root          9620 Jul 27 18:31 vendor.conf
+#8 0.136 /bin/sh: stop: not found
+```

docs/guides/bake/hcl-funcs.md

@@ -0,0 +1,327 @@
+# User defined HCL functions
+
+## Using interpolation to tag an image with the git sha
+
+As shown in the [File definition](file-definition.md#variable) page, `bake`
+supports variable blocks which are assigned to matching environment variables
+or default values:
+
+```hcl
+# docker-bake.hcl
+variable "TAG" {
+  default = "latest"
+}
+
+group "default" {
+  targets = ["webapp"]
+}
+
+target "webapp" {
+  tags = ["docker.io/username/webapp:${TAG}"]
+}
+```
+
+alternatively, in json format:
+
+```json
+{
+  "variable": {
+    "TAG": {
+      "default": "latest"
+    }
+  },
+  "group": {
+    "default": {
+      "targets": ["webapp"]
+    }
+  },
+  "target": {
+    "webapp": {
+      "tags": ["docker.io/username/webapp:${TAG}"]
+    }
+  }
+}
+```
+
+```console
+$ docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "docker.io/username/webapp:latest"
+      ]
+    }
+  }
+}
+```
+
+```console
+$ TAG=$(git rev-parse --short HEAD) docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "docker.io/username/webapp:985e9e9"
+      ]
+    }
+  }
+}
+```
+
+## Using the `add` function
+
+You can use [`go-cty` stdlib functions](https://github.com/zclconf/go-cty/tree/main/cty/function/stdlib).
+Here we are using the `add` function.
+
+```hcl
+# docker-bake.hcl
+variable "TAG" {
+  default = "latest"
+}
+
+group "default" {
+  targets = ["webapp"]
+}
+
+target "webapp" {
+  args = {
+    buildno = "${add(123, 1)}"
+  }
+}
+```
+
+```console
+$ docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "buildno": "124"
+      }
+    }
+  }
+}
+```
+
+## Defining an `increment` function
+
+It also supports [user defined functions](https://github.com/hashicorp/hcl/tree/main/ext/userfunc).
+The following example defines a simple an `increment` function.
+
+```hcl
+# docker-bake.hcl
+function "increment" {
+  params = [number]
+  result = number + 1
+}
+
+group "default" {
+  targets = ["webapp"]
+}
+
+target "webapp" {
+  args = {
+    buildno = "${increment(123)}"
+  }
+}
+```
+
+```console
+$ docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "buildno": "124"
+      }
+    }
+  }
+}
+```
+
+## Only adding tags if a variable is not empty using an `notequal`
+
+Here we are using the conditional `notequal` function which is just for
+symmetry with the `equal` one.
+
+```hcl
+# docker-bake.hcl
+variable "TAG" {default="" }
+
+group "default" {
+  targets = [
+    "webapp",
+  ]
+}
+
+target "webapp" {
+  context="."
+  dockerfile="Dockerfile"
+  tags = [
+    "my-image:latest",
+    notequal("",TAG) ? "my-image:${TAG}": "",
+  ]
+}
+```
+
+```console
+$ docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "my-image:latest"
+      ]
+    }
+  }
+}
+```
+
+## Using variables in functions
+
+You can refer variables to other variables like the target blocks can. Stdlib
+functions can also be called but user functions can't at the moment.
+
+```hcl
+# docker-bake.hcl
+variable "REPO" {
+  default = "user/repo"
+}
+
+function "tag" {
+  params = [tag]
+  result = ["${REPO}:${tag}"]
+}
+
+target "webapp" {
+  tags = tag("v1")
+}
+```
+
+```console
+$ docker buildx bake --print webapp
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "webapp"
+      ]
+    }
+  },
+  "target": {
+    "webapp": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "user/repo:v1"
+      ]
+    }
+  }
+}
+```
+
+## Using typed variables
+
+Non-string variables are also accepted. The value passed with env is parsed
+into suitable type first.
+
+```hcl
+# docker-bake.hcl
+variable "FOO" {
+  default = 3
+}
+
+variable "IS_FOO" {
+  default = true
+}
+
+target "app" {
+  args = {
+    v1 = FOO > 5 ? "higher" : "lower" 
+    v2 = IS_FOO ? "yes" : "no"
+  }
+}
+```
+
+```console
+$ docker buildx bake --print app
+```
+```json
+{
+  "group": {
+    "default": {
+      "targets": [
+        "app"
+      ]
+    }
+  },
+  "target": {
+    "app": {
+      "context": ".",
+      "dockerfile": "Dockerfile",
+      "args": {
+        "v1": "lower",
+        "v2": "yes"
+      }
+    }
+  }
+}
+```

docs/guides/bake/index.md

@@ -0,0 +1,36 @@
+# High-level build options with Bake
+
+> This command is experimental.
+>
+> The design of bake is in early stages, and we are looking for [feedback from users](https://github.com/docker/buildx/issues).
+{: .experimental }
+
+Buildx also aims to provide support for high-level build concepts that go beyond
+invoking a single build command. We want to support building all the images in
+your application together and let the users define project specific reusable
+build flows that can then be easily invoked by anyone.
+
+[BuildKit](https://github.com/moby/buildkit) efficiently handles multiple
+concurrent build requests and de-duplicating work. The build commands can be
+combined with general-purpose command runners (for example, `make`). However,
+these tools generally invoke builds in sequence  and therefore cannot leverage
+the full potential of BuildKit parallelization, or combine BuildKit's output
+for the user. For this use case, we have added a command called
+[`docker buildx bake`](https://docs.docker.com/engine/reference/commandline/buildx_bake/).
+
+The `bake` command supports building images from HCL, JSON and Compose files.
+This is similar to [`docker compose build`](https://docs.docker.com/compose/reference/build/),
+but allowing all the services to be built concurrently as part of a single
+request. If multiple files are specified they are all read and configurations are
+combined.
+
+We recommend using HCL files as its experience is more aligned with buildx UX
+and also allows better code reuse, different target groups and extended features.
+
+## Next steps
+
+* [File definition](file-definition.md)
+* [Configuring builds](configuring-build.md)
+* [User defined HCL functions](hcl-funcs.md)
+* [Defining additional build contexts and linking targets](build-contexts.md)
+* [Building from Compose file](compose-file.md)

docs/guides/cicd.md

@@ -0,0 +1,48 @@
+# CI/CD
+
+## GitHub Actions
+
+Docker provides a [GitHub Action that will build and push your image](https://github.com/docker/build-push-action/#about)
+using Buildx. Here is a simple workflow:
+
+```yaml
+name: ci
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v2 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: user/app:latest
+```
+
+In this example we are also using 3 other actions:
+
+* [`setup-buildx`](https://github.com/docker/setup-buildx-action) action will create and boot a builder using by
+default the `docker-container` [builder driver](../reference/buildx_create.md#driver).
+This is **not required but recommended** using it to be able to build multi-platform images, export cache, etc.
+* [`setup-qemu`](https://github.com/docker/setup-qemu-action) action can be useful if you want
+to add emulation support with QEMU to be able to build against more platforms.
+* [`login`](https://github.com/docker/login-action) action will take care to log
+in against a Docker registry.

docs/guides/cni-networking.md

@@ -0,0 +1,23 @@
+# CNI networking
+
+It can be useful to use a bridge network for your builder if for example you
+encounter a network port contention during multiple builds. If you're using
+the BuildKit image, CNI is not yet available in it, but you can create
+[a custom BuildKit image with CNI support](https://github.com/moby/buildkit/blob/master/docs/cni-networking.md).
+
+Now build this image:
+
+```console
+$ docker buildx build --tag buildkit-cni:local --load .
+```
+
+Then [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/) that
+will use this image:
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --driver-opt "image=buildkit-cni:local" \
+  --buildkitd-flags "--oci-worker-net=cni"
+```

docs/guides/color-output.md

@@ -0,0 +1,20 @@
+# Color output controls
+
+Buildx has support for modifying the colors that are used to output information
+to the terminal. You can set the environment variable `BUILDKIT_COLORS` to
+something like `run=123,20,245:error=yellow:cancel=blue:warning=white` to set
+the colors that you would like to use:
+
+![Progress output custom colors](https://user-images.githubusercontent.com/1951866/180584033-24522385-cafd-4a54-a4a2-18f5ce74eb27.png)
+
+Setting `NO_COLOR` to anything will disable any colorized output as recommended
+by [no-color.org](https://no-color.org/):
+
+![Progress output no color](https://user-images.githubusercontent.com/1951866/180584037-e28f9997-dd4c-49cf-8b26-04864815de19.png)
+
+> **Note**
+>
+> Parsing errors will be reported but ignored. This will result in default
+> color values being used where needed.
+
+See also [the list of pre-defined colors](https://github.com/moby/buildkit/blob/master/util/progress/progressui/colors.go).

docs/guides/custom-network.md

@@ -0,0 +1,34 @@
+# Using a custom network
+
+[Create a network](https://docs.docker.com/engine/reference/commandline/network_create/)
+named `foonet`:
+
+```console
+$ docker network create foonet
+```
+
+[Create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
+named `mybuilder` that will use this network:
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --driver-opt "network=foonet"
+```
+
+Boot and [inspect `mybuilder`](https://docs.docker.com/engine/reference/commandline/buildx_inspect/):
+
+```console
+$ docker buildx inspect --bootstrap
+```
+
+[Inspect the builder container](https://docs.docker.com/engine/reference/commandline/inspect/)
+and see what network is being used:
+
+{% raw %}
+```console
+$ docker inspect buildx_buildkit_mybuilder0 --format={{.NetworkSettings.Networks}}
+map[foonet:0xc00018c0c0]
+```
+{% endraw %}

docs/guides/custom-registry-config.md

@@ -0,0 +1,63 @@
+# Using a custom registry configuration
+
+If you [create a `docker-container` or `kubernetes` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/) and
+have specified certificates for registries in the [BuildKit daemon configuration](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md),
+the files will be copied into the container under `/etc/buildkit/certs` and
+configuration will be updated to reflect that.
+
+Take the following `buildkitd.toml` configuration that will be used for
+pushing an image to this registry using self-signed certificates:
+
+```toml
+# /etc/buildkitd.toml
+debug = true
+[registry."myregistry.com"]
+  ca=["/etc/certs/myregistry.pem"]
+  [[registry."myregistry.com".keypair]]
+    key="/etc/certs/myregistry_key.pem"
+    cert="/etc/certs/myregistry_cert.pem"
+```
+
+Here we have configured a self-signed certificate for `myregistry.com` registry.
+
+Now [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
+that will use this BuildKit configuration:
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --config /etc/buildkitd.toml
+```
+
+Inspecting the builder container, you can see that buildkitd configuration
+has changed:
+
+```console
+$ docker exec -it buildx_buildkit_mybuilder0 cat /etc/buildkit/buildkitd.toml
+```
+```toml
+debug = true
+
+[registry]
+
+  [registry."myregistry.com"]
+    ca = ["/etc/buildkit/certs/myregistry.com/myregistry.pem"]
+
+    [[registry."myregistry.com".keypair]]
+      cert = "/etc/buildkit/certs/myregistry.com/myregistry_cert.pem"
+      key = "/etc/buildkit/certs/myregistry.com/myregistry_key.pem"
+```
+
+And certificates copied inside the container:
+
+```console
+$ docker exec -it buildx_buildkit_mybuilder0 ls /etc/buildkit/certs/myregistry.com/
+myregistry.pem    myregistry_cert.pem   myregistry_key.pem
+```
+
+Now you should be able to push to the registry with this builder:
+
+```console
+$ docker buildx build --push --tag myregistry.com/myimage:latest .
+```

docs/guides/drivers/docker-container.md

@@ -0,0 +1,75 @@
+# Docker container driver
+
+The buildx docker-container driver allows creation of a managed and
+customizable BuildKit environment inside a dedicated Docker container.
+
+Using the docker-container driver has a couple of advantages over the basic
+docker driver. Firstly, we can manually override the version of buildkit to
+use, meaning that we can access the latest and greatest features as soon as
+they're released, instead of waiting to upgrade to a newer version of Docker.
+Additionally, we can access more complex features like multi-architecture
+builds and the more advanced cache exporters, which are currently unsupported
+in the default docker driver.
+
+We can easily create a new builder that uses the docker-container driver:
+
+```console
+$ docker buildx create --name container --driver docker-container
+container
+```
+
+We should then be able to see it on our list of available builders:
+
+```console
+$ docker buildx ls
+NAME/NODE       DRIVER/ENDPOINT      STATUS   BUILDKIT PLATFORMS
+container       docker-container                       
+  container0    desktop-linux        inactive          
+default         docker                                 
+  default       default              running  20.10.17 linux/amd64, linux/386
+```
+
+If we trigger a build, the appropriate `moby/buildkit` image will be pulled
+from [Docker Hub](https://hub.docker.com/u/moby/buildkit), the image started,
+and our build submitted to our containerized build server.
+
+```console
+$ docker buildx build -t <image> --builder=container .
+WARNING: No output specified with docker-container driver. Build result will only remain in the build cache. To push result image into registry use --push or to load image into docker use --load
+#1 [internal] booting buildkit
+#1 pulling image moby/buildkit:buildx-stable-1
+#1 pulling image moby/buildkit:buildx-stable-1 1.9s done
+#1 creating container buildx_buildkit_container0
+#1 creating container buildx_buildkit_container0 0.5s done
+#1 DONE 2.4s
+...
+```
+
+Note the warning "Build result will only remain in the build cache" - unlike
+the `docker` driver, the built image must be explicitly loaded into the local
+image store. We can use the `--load` flag for this:
+
+```console
+$ docker buildx build --load -t <image> --builder=container .
+...
+ => exporting to oci image format                                                                                                      7.7s
+ => => exporting layers                                                                                                                4.9s
+ => => exporting manifest sha256:4e4ca161fa338be2c303445411900ebbc5fc086153a0b846ac12996960b479d3                                      0.0s 
+ => => exporting config sha256:adf3eec768a14b6e183a1010cb96d91155a82fd722a1091440c88f3747f1f53f                                        0.0s 
+ => => sending tarball                                                                                                                 2.8s 
+ => importing to docker   
+```
+
+The image should then be available in the image store:
+
+```console
+$ docker image ls
+REPOSITORY                       TAG               IMAGE ID       CREATED             SIZE
+<image>                          latest            adf3eec768a1   2 minutes ago       197MB
+```
+
+## Further reading
+
+For more information on the docker-container driver, see the [buildx reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver).
+
+<!--- FIXME: for 0.9, make reference link relative --->

docs/guides/drivers/docker.md

@@ -0,0 +1,50 @@
+# Docker driver
+
+The buildx docker driver is the default builtin driver, that uses the BuildKit
+server components built directly into the docker engine.
+
+No setup should be required for the docker driver - it should already be
+configured for you:
+
+```console
+$ docker buildx ls
+NAME/NODE       DRIVER/ENDPOINT      STATUS   BUILDKIT PLATFORMS
+default         docker                                 
+  default       default              running  20.10.17 linux/amd64, linux/386
+```
+
+This builder is ready to build with out-of-the-box, requiring no extra setup,
+so you can get going with a `docker buildx build` as soon as you like.
+
+Depending on your personal setup, you may find multiple builders in your list
+the use the docker driver. For example, on a system that runs both a package
+managed version of dockerd, as well as Docker Desktop, you might have the
+following:
+
+```console
+NAME/NODE       DRIVER/ENDPOINT STATUS  BUILDKIT PLATFORMS
+default         docker                           
+  default       default         running 20.10.17 linux/amd64, linux/386
+desktop-linux * docker                           
+  desktop-linux desktop-linux   running 20.10.17 linux/amd64, linux/arm64, linux/riscv64, linux/ppc64le, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6
+```
+
+This is because the docker driver builders are automatically pulled from
+the available [Docker Contexts](https://docs.docker.com/engine/context/working-with-contexts/).
+When you add new contexts using `docker context create`, these will appear in
+your list of buildx builders.
+
+Unlike the [other drivers](../index.md), builders using the docker driver
+cannot be manually created, and can only be automatically created from the
+docker context. Additionally, they cannot be configured to a specific BuildKit
+version, and cannot take any extra parameters, as these are both preset by the
+Docker engine internally.
+
+If you want the extra configuration and flexibility without too much more
+overhead, then see the help page for the [docker-container driver](./docker-container.md).
+
+## Further reading
+
+For more information on the docker driver, see the [buildx reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver).
+
+<!--- FIXME: for 0.9, make reference link relative --->

docs/guides/drivers/index.md

@@ -0,0 +1,41 @@
+# Buildx drivers overview
+
+The buildx client connects out to the BuildKit backend to execute builds -
+Buildx drivers allow fine-grained control over management of the backend, and
+supports several different options for where and how BuildKit should run.
+
+Currently, we support the following drivers:
+
+- The `docker` driver, that uses the BuildKit library bundled into the Docker
+  daemon.
+  ([guide](./docker.md), [reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver))
+- The `docker-container` driver, that launches a dedicated BuildKit container
+  using Docker, for access to advanced features.
+  ([guide](./docker-container.md), [reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver))
+- The `kubernetes` driver, that launches dedicated BuildKit pods in a
+  remote Kubernetes cluster, for scalable builds.
+  ([guide](./kubernetes.md), [reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver))
+- The `remote` driver, that allows directly connecting to a manually managed
+  BuildKit daemon, for more custom setups.
+  ([guide](./remote.md))
+
+<!--- FIXME: for 0.9, make links relative, and add reference link for remote --->
+
+To create a new builder that uses one of the above drivers, you can use the
+[`docker buildx create`](https://docs.docker.com/engine/reference/commandline/buildx_create/) command:
+
+```console
+$ docker buildx create --name=<builder-name> --driver=<driver> --driver-opt=<driver-options>
+```
+
+The build experience is very similar across drivers, however, there are some
+features that are not evenly supported across the board, notably, the `docker`
+driver does not include support for certain output/caching types.
+
+| Feature                       |    `docker`     | `docker-container` | `kubernetes` |        `remote`        |
+| :---------------------------- | :-------------: | :----------------: | :----------: | :--------------------: |
+| **Automatic `--load`**        |        ✅        |         ❌          |      ❌       |           ❌            |
+| **Cache export**              | ❔ (inline only) |         ✅          |      ✅       |           ✅            |
+| **Docker/OCI tarball output** |        ❌        |         ✅          |      ✅       |           ✅            |
+| **Multi-arch images**         |        ❌        |         ✅          |      ✅       |           ✅            |
+| **BuildKit configuration**    |        ❌        |         ✅          |      ✅       | ❔ (managed externally) |

docs/guides/drivers/kubernetes.md

@@ -0,0 +1,238 @@
+# Kubernetes driver
+
+The buildx kubernetes driver allows connecting your local development or ci
+environments to your kubernetes cluster to allow access to more powerful
+and varied compute resources.
+
+This guide assumes you already have an existing kubernetes cluster - if you don't already
+have one, you can easily follow along by installing
+[minikube](https://minikube.sigs.k8s.io/docs/).
+
+Before connecting buildx to your cluster, you may want to create a dedicated
+namespace using `kubectl` to keep your buildx-managed resources separate. You
+can call your namespace anything you want, or use the existing `default`
+namespace, but we'll create a `buildkit` namespace for now:
+
+```console
+$ kubectl create namespace buildkit
+```
+
+Then create a new buildx builder:
+
+```console
+$ docker buildx create \
+  --bootstrap \
+  --name=kube \
+  --driver=kubernetes \
+  --driver-opt=namespace=buildkit
+```
+
+This assumes that the kubernetes cluster you want to connect to is currently
+accessible via the kubectl command, with the `KUBECONFIG` environment variable
+[set appropriately](https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/#set-the-kubeconfig-environment-variable)
+if neccessary.
+
+You should now be able to see the builder in the list of buildx builders:
+
+```console
+$ docker buildx ls
+NAME/NODE                DRIVER/ENDPOINT STATUS  PLATFORMS
+kube                     kubernetes              
+  kube0-6977cdcb75-k9h9m                 running linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/386
+default *                docker
+  default                default         running linux/amd64, linux/386
+```
+
+The buildx driver creates the neccessary resources on your cluster in the
+specified namespace (in this case, `buildkit`), while keeping your
+driver configuration locally. You can see the running pods with:
+
+```console
+$ kubectl -n buildkit get deployments
+NAME    READY   UP-TO-DATE   AVAILABLE   AGE
+kube0   1/1     1            1           32s
+
+$ kubectl -n buildkit get pods
+NAME                     READY   STATUS    RESTARTS   AGE
+kube0-6977cdcb75-k9h9m   1/1     Running   0          32s
+```
+
+You can use your new builder by including the `--builder` flag when running
+buildx commands. For example (replacing `<user>` and `<image>` with your Docker
+Hub username and desired image output respectively):
+
+```console
+$ docker buildx build . \
+  --builder=kube \
+  -t <user>/<image> \
+  --push
+```
+
+## Scaling Buildkit
+
+One of the main advantages of the kubernetes builder is that you can easily
+scale your builder up and down to handle increased build load. These controls
+are exposed via the following options:
+
+- `replicas=N`
+  - This scales the number of buildkit pods to the desired size. By default,
+    only a single pod will be created, but increasing this allows taking of
+    advantage of multiple nodes in your cluster.
+- `requests.cpu`, `requests.memory`, `limits.cpu`, `limits.memory`
+  - These options allow requesting and limiting the resources available to each
+    buildkit pod according to the official kubernetes documentation
+    [here](https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/).
+    
+For example, to create 4 replica buildkit pods:
+
+```console
+$ docker buildx create \
+  --bootstrap \
+  --name=kube \
+  --driver=kubernetes \
+  --driver-opt=namespace=buildkit,replicas=4
+```
+
+Listing the pods, we get:
+
+```console
+$ kubectl -n buildkit get deployments
+NAME    READY   UP-TO-DATE   AVAILABLE   AGE
+kube0   4/4     4            4           8s
+
+$ kubectl -n buildkit get pods
+NAME                     READY   STATUS    RESTARTS   AGE
+kube0-6977cdcb75-48ld2   1/1     Running   0          8s
+kube0-6977cdcb75-rkc6b   1/1     Running   0          8s
+kube0-6977cdcb75-vb4ks   1/1     Running   0          8s
+kube0-6977cdcb75-z4fzs   1/1     Running   0          8s
+```
+    
+Additionally, you can use the `loadbalance=(sticky|random)` option to control
+the load-balancing behavior when there are multiple replicas. While `random`
+should selects random nodes from the available pool, which should provide
+better balancing across all replicas, `sticky` (the default) attempts to
+connect the same build performed multiple times to the same node each time,
+ensuring better local cache utilization.
+
+For more information on scalability, see the options for [buildx create](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver-opt).
+
+## Multi-platform builds
+
+The kubernetes buildx driver has support for creating [multi-platform images](https://docs.docker.com/build/buildx/multiplatform-images/),
+for easily building for multiple platforms at once.
+
+### QEMU
+
+Like the other containerized driver `docker-container`, the kubernetes driver
+also supports using [QEMU](https://www.qemu.org/) (user mode) to build
+non-native platforms. If using a default setup like above, no extra setup
+should be needed, you should just be able to start building for other
+architectures, by including the `--platform` flag.
+
+For example, to build a Linux image for `amd64` and `arm64`:
+
+```console
+$ docker buildx build . \
+  --builder=kube \
+  --platform=linux/amd64,linux/arm64 \
+  -t <user>/<image> \
+  --push
+```
+
+> **Warning**
+> QEMU performs full-system emulation of non-native platforms, which is *much*
+> slower than native builds. Compute-heavy tasks like compilation and
+> compression/decompression will likely take a large performance hit.
+
+Note, if you're using a custom buildkit image using the `image=<image>` driver
+option, or invoking non-native binaries from within your build, you may need to
+explicitly enable QEMU using the `qemu.install` option during driver creation:
+
+```console
+$ docker buildx create \
+  --bootstrap \
+  --name=kube \
+  --driver=kubernetes \
+  --driver-opt=namespace=buildkit,qemu.install=true
+```
+
+### Native
+
+If you have access to cluster nodes of different architectures, we can
+configure the kubernetes driver to take advantage of these for native builds.
+To do this, we need to use the `--append` feature of `docker buildx create`.
+
+To start, we can create our builder with explicit support for a single
+architecture, `amd64`:
+
+```console
+$ docker buildx create \
+  --bootstrap \
+  --name=kube \
+  --driver=kubernetes \
+  --platform=linux/amd64 \
+  --node=builder-amd64 \
+  --driver-opt=namespace=buildkit,nodeselector="kubernetes.io/arch=amd64"
+```
+
+This creates a buildx builder `kube` containing a single builder node `builder-amd64`.
+Note that the buildx concept of a node is not the same as the kubernetes
+concept of a node - the buildx node in this case could connect multiple
+kubernetes nodes of the same architecture together.
+
+With our `kube` driver created, we can now introduce another architecture into
+the mix, for example, like before we can use `arm64`:
+
+```console
+$ docker buildx create \
+  --append \
+  --bootstrap \
+  --name=kube \
+  --driver=kubernetes \
+  --platform=linux/arm64 \
+  --node=builder-arm64 \
+  --driver-opt=namespace=buildkit,nodeselector="kubernetes.io/arch=arm64"
+```
+
+If you list builders now, you should be able to see both nodes present:
+
+```console
+$ docker buildx ls
+NAME/NODE       DRIVER/ENDPOINT                                         STATUS   PLATFORMS
+kube            kubernetes                                                       
+  builder-amd64 kubernetes:///kube?deployment=builder-amd64&kubeconfig= running  linux/amd64*, linux/amd64/v2, linux/amd64/v3, linux/386
+  builder-arm64 kubernetes:///kube?deployment=builder-arm64&kubeconfig= running  linux/arm64*
+```
+
+You should now be able to build multi-arch images with `amd64` and `arm64`
+combined, by specifying those platforms together in your buildx command:
+
+```console
+$ docker buildx build --builder=kube --platform=linux/amd64,linux/arm64 -t <user>/<image> --push .
+```
+
+You can repeat the `buildx create --append` command for as many different
+architectures that you want to support.
+
+## Rootless mode
+
+The kubernetes driver supports rootless mode. For more information on how
+rootless mode works, and it's requirements, see [here](https://github.com/moby/buildkit/blob/master/docs/rootless.md).
+
+To enable it in your cluster, you can use the `rootless=true` driver option:
+
+```console
+$ docker buildx create \
+  --name=kube \
+  --driver=kubernetes \
+  --driver-opt=namespace=buildkit,rootless=true
+```
+
+This will create your pods without `securityContext.privileged`.
+
+## Further reading
+
+For more information on the kubernetes driver, see the [buildx reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver).
+
+<!--- FIXME: for 0.9, make reference link relative --->

docs/guides/drivers/remote.md

@@ -0,0 +1,178 @@
+# Remote driver
+
+The buildx remote driver allows for more complex custom build workloads that
+allow users to connect to external buildkit instances. This is useful for
+scenarios that require manual management of the buildkit daemon, or where a
+buildkit daemon is exposed from another source.
+
+To connect to a running buildkitd instance:
+
+```console
+$ docker buildx create \
+  --name remote \
+  --driver remote \
+  tcp://localhost:1234
+```
+
+## Remote Buildkit over Unix sockets
+
+In this scenario, we'll create a setup with buildkitd listening on a unix
+socket, and have buildx connect through it.
+
+Firstly, ensure that [buildkit](https://github.com/moby/buildkit) is installed.
+For example, you can launch an instance of buildkitd with:
+
+```console
+$ sudo ./buildkitd --group $(id -gn) --addr unix://$HOME/buildkitd.sock
+```
+
+Alternatively, [see here](https://github.com/moby/buildkit/blob/master/docs/rootless.md)
+for running buildkitd in rootless mode or [here](https://github.com/moby/buildkit/tree/master/examples/systemd)
+for examples of running it as a systemd service.
+
+You should now have a unix socket accessible to your user, that is available to
+connect to:
+
+```console
+$ ls -lh /home/user/buildkitd.sock
+srw-rw---- 1 root user 0 May  5 11:04 /home/user/buildkitd.sock
+```
+
+You can then connect buildx to it with the remote driver:
+
+```console
+$ docker buildx create \
+  --name remote-unix \
+  --driver remote \
+  unix://$HOME/buildkitd.sock
+```
+        
+If you list available builders, you should then see `remote-unix` among them:
+
+```console
+$ docker buildx ls
+NAME/NODE           DRIVER/ENDPOINT                        STATUS  PLATFORMS
+remote-unix         remote
+  remote-unix0      unix:///home/.../buildkitd.sock        running linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/386
+default *           docker
+  default           default                                running linux/amd64, linux/386
+```
+
+We can switch to this new builder as the default using `docker buildx use remote-unix`,
+or specify it per build:
+
+```console
+$ docker buildx build --builder=remote-unix -t test --load .
+```
+
+(remember that `--load` is necessary when not using the default `docker`
+driver, to load the build result into the docker daemon)
+
+## Remote Buildkit in Docker container
+
+In this scenario, we'll create a similar setup to the `docker-container`
+driver, by manually booting a buildkit docker container and connecting to it
+using the buildx remote driver. In most cases you'd probably just use the
+`docker-container` driver that connects to buildkit through the Docker daemon,
+but in this case we manually create a container and access it via it's exposed
+port.
+
+First, we need to generate certificates for buildkit - you can use the 
+[create-certs.sh](https://github.com/moby/buildkit/v0.10.3/master/examples/kubernetes/create-certs.sh)
+script as a starting point. Note, that while it is *possible* to expose
+buildkit over TCP without using TLS, it is **not recommended**, since this will
+allow arbitrary access to buildkit without credentials.
+
+With our certificates generated in `.certs/`, we startup the container:
+
+```console
+$ docker run -d --rm \
+  --name=remote-buildkitd \
+  --privileged \
+  -p 1234:1234 \
+  -v $PWD/.certs:/etc/buildkit/certs \
+  moby/buildkit:latest \
+  --addr tcp://0.0.0.0:1234 \
+  --tlscacert /etc/buildkit/certs/ca.pem \
+  --tlscert /etc/buildkit/certs/daemon-cert.pem \
+  --tlskey /etc/buildkit/certs/daemon-key.pem
+```
+
+The above command starts a buildkit container and exposes the daemon's port
+1234 to localhost.
+
+We can now connect to this running container using buildx:
+
+```console
+$ docker buildx create \
+  --name remote-container \
+  --driver remote \
+  --driver-opt cacert=.certs/ca.pem,cert=.certs/client-cert.pem,key=.certs/client-key.pem,servername=... \
+  tcp://localhost:1234
+```
+
+Alternatively, we could use the `docker-container://` URL scheme to connect
+to the buildkit container without specifying a port:
+
+```console
+$ docker buildx create \
+  --name remote-container \
+  --driver remote \
+  docker-container://remote-container
+```
+
+## Remote Buildkit in Kubernetes
+
+In this scenario, we'll create a similar setup to the `kubernetes` driver by
+manually creating a buildkit `Deployment`. While the `kubernetes` driver will
+do this under-the-hood, it might sometimes be desirable to scale buildkit
+manually. Additionally, when executing builds from inside Kubernetes pods,
+the buildx builder will need to be recreated from within each pod or copied
+between them.
+
+Firstly, we can create a kubernetes deployment of buildkitd, as per the
+instructions [here](https://github.com/moby/buildkit/tree/master/examples/kubernetes).
+Following the guide, we setup certificates for the buildkit daemon and client
+(as above using [create-certs.sh](https://github.com/moby/buildkit/blob/v0.10.3/examples/kubernetes/create-certs.sh))
+and create a `Deployment` of buildkit pods with a service that connects to
+them.
+
+Assuming that the service is called `buildkitd`, we can create a remote builder
+in buildx, ensuring that the listed certificate files are present:
+
+```console
+$ docker buildx create \
+  --name remote-kubernetes \
+  --driver remote \
+  --driver-opt cacert=.certs/ca.pem,cert=.certs/client-cert.pem,key=.certs/client-key.pem \
+  tcp://buildkitd.default.svc:1234
+```
+
+Note that the above will only work in-cluster (since the buildkit setup guide
+only creates a ClusterIP service). To configure the builder to be accessible
+remotely, you can use an appropriately configured Ingress, which is outside the
+scope of this guide.
+
+To access the service remotely, we can use the port forwarding mechanism in
+kubectl:
+
+```console
+$ kubectl port-forward svc/buildkitd 1234:1234
+```
+
+Then you can simply point the remote driver at `tcp://localhost:1234`.
+
+Alternatively, we could use the `kube-pod://` URL scheme to connect
+directly to a buildkit pod through the kubernetes api (note that this method
+will only connect to a single pod in the deployment):
+
+```console
+$ kubectl get pods --selector=app=buildkitd -o json | jq -r '.items[].metadata.name
+buildkitd-XXXXXXXXXX-xxxxx
+$ docker buildx create \
+  --name remote-container \
+  --driver remote \
+  kube-pod://buildkitd-XXXXXXXXXX-xxxxx
+```
+
+<!--- FIXME: for 0.9, add further reading section with link to reference --->

docs/guides/opentelemetry.md

@@ -0,0 +1,31 @@
+# OpenTelemetry support
+
+To capture the trace to [Jaeger](https://github.com/jaegertracing/jaeger), set
+`JAEGER_TRACE` environment variable to the collection address using a `driver-opt`.
+
+First create a Jaeger container:
+
+```console
+$ docker run -d --name jaeger -p "6831:6831/udp" -p "16686:16686" jaegertracing/all-in-one
+```
+
+Then [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
+that will use the Jaeger instance via the `JAEGER_TRACE` env var:
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --driver-opt "network=host" \
+  --driver-opt "env.JAEGER_TRACE=localhost:6831"
+```
+
+Boot and [inspect `mybuilder`](https://docs.docker.com/engine/reference/commandline/buildx_inspect/):
+
+```console
+$ docker buildx inspect --bootstrap
+```
+
+Buildx commands should be traced at `http://127.0.0.1:16686/`:
+
+![OpenTelemetry Buildx Bake](https://user-images.githubusercontent.com/1951866/124468052-ef085400-dd98-11eb-84ab-7ac8e261dd52.png)

docs/guides/registry-mirror.md

@@ -0,0 +1,62 @@
+# Registry mirror
+
+You can define a registry mirror to use for your builds by providing a [BuildKit daemon configuration](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md)
+while creating a builder with the [`--config` flags](https://docs.docker.com/engine/reference/commandline/buildx_create/#config).
+
+```toml
+# /etc/buildkitd.toml
+debug = true
+[registry."docker.io"]
+  mirrors = ["mirror.gcr.io"]
+```
+
+> **Note**
+>
+> `debug = true` has been added to be able to debug requests
+> in the BuildKit daemon and see if the mirror is effectively used.
+
+Then [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
+that will use this BuildKit configuration:
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --config /etc/buildkitd.toml
+```
+
+Boot and [inspect `mybuilder`](https://docs.docker.com/engine/reference/commandline/buildx_inspect/):
+
+```console
+$ docker buildx inspect --bootstrap
+```
+
+Build an image:
+
+```console
+$ docker buildx build --load . -f-<<EOF
+FROM alpine
+RUN echo "hello world"
+EOF
+```
+
+Now let's check the BuildKit logs in the builder container:
+
+```console
+$ docker logs buildx_buildkit_mybuilder0
+```
+```text
+...
+time="2022-02-06T17:47:48Z" level=debug msg="do request" request.header.accept="application/vnd.docker.container.image.v1+json, */*" request.header.user-agent=containerd/1.5.8+unknown request.method=GET spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg="fetch response received" response.header.accept-ranges=bytes response.header.age=1356 response.header.alt-svc="h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"" response.header.cache-control="public, max-age=3600" response.header.content-length=1469 response.header.content-type=application/octet-stream response.header.date="Sun, 06 Feb 2022 17:25:17 GMT" response.header.etag="\"774380abda8f4eae9a149e5d5d3efc83\"" response.header.expires="Sun, 06 Feb 2022 18:25:17 GMT" response.header.last-modified="Wed, 24 Nov 2021 21:07:57 GMT" response.header.server=UploadServer response.header.x-goog-generation=1637788077652182 response.header.x-goog-hash="crc32c=V3DSrg==" response.header.x-goog-hash.1="md5=d0OAq9qPTq6aFJ5dXT78gw==" response.header.x-goog-metageneration=1 response.header.x-goog-storage-class=STANDARD response.header.x-goog-stored-content-encoding=identity response.header.x-goog-stored-content-length=1469 response.header.x-guploader-uploadid=ADPycduqQipVAXc3tzXmTzKQ2gTT6CV736B2J628smtD1iDytEyiYCgvvdD8zz9BT1J1sASUq9pW_ctUyC4B-v2jvhIxnZTlKg response.status="200 OK" spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg="fetch response received" response.header.accept-ranges=bytes response.header.age=760 response.header.alt-svc="h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"" response.header.cache-control="public, max-age=3600" response.header.content-length=1471 response.header.content-type=application/octet-stream response.header.date="Sun, 06 Feb 2022 17:35:13 GMT" response.header.etag="\"35d688bd15327daafcdb4d4395e616a8\"" response.header.expires="Sun, 06 Feb 2022 18:35:13 GMT" response.header.last-modified="Wed, 24 Nov 2021 21:07:12 GMT" response.header.server=UploadServer response.header.x-goog-generation=1637788032100793 response.header.x-goog-hash="crc32c=aWgRjA==" response.header.x-goog-hash.1="md5=NdaIvRUyfar8201DleYWqA==" response.header.x-goog-metageneration=1 response.header.x-goog-storage-class=STANDARD response.header.x-goog-stored-content-encoding=identity response.header.x-goog-stored-content-length=1471 response.header.x-guploader-uploadid=ADPycdtR-gJYwC7yHquIkJWFFG8FovDySvtmRnZBqlO3yVDanBXh_VqKYt400yhuf0XbQ3ZMB9IZV2vlcyHezn_Pu3a1SMMtiw response.status="200 OK" spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg=fetch spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg=fetch spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg=fetch spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg=fetch spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg="do request" request.header.accept="application/vnd.docker.image.rootfs.diff.tar.gzip, */*" request.header.user-agent=containerd/1.5.8+unknown request.method=GET spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+time="2022-02-06T17:47:48Z" level=debug msg="fetch response received" response.header.accept-ranges=bytes response.header.age=1356 response.header.alt-svc="h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"" response.header.cache-control="public, max-age=3600" response.header.content-length=2818413 response.header.content-type=application/octet-stream response.header.date="Sun, 06 Feb 2022 17:25:17 GMT" response.header.etag="\"1d55e7be5a77c4a908ad11bc33ebea1c\"" response.header.expires="Sun, 06 Feb 2022 18:25:17 GMT" response.header.last-modified="Wed, 24 Nov 2021 21:07:06 GMT" response.header.server=UploadServer response.header.x-goog-generation=1637788026431708 response.header.x-goog-hash="crc32c=ZojF+g==" response.header.x-goog-hash.1="md5=HVXnvlp3xKkIrRG8M+vqHA==" response.header.x-goog-metageneration=1 response.header.x-goog-storage-class=STANDARD response.header.x-goog-stored-content-encoding=identity response.header.x-goog-stored-content-length=2818413 response.header.x-guploader-uploadid=ADPycdsebqxiTBJqZ0bv9zBigjFxgQydD2ESZSkKchpE0ILlN9Ibko3C5r4fJTJ4UR9ddp-UBd-2v_4eRpZ8Yo2llW_j4k8WhQ response.status="200 OK" spanID=9460e5b6e64cec91 traceID=b162d3040ddf86d6614e79c66a01a577
+...
+```
+
+As you can see, requests come from the GCR registry mirror (`response.header.x-goog*`).

docs/guides/resource-limiting.md

@@ -0,0 +1,33 @@
+# Resource limiting
+
+## Max parallelism
+
+You can limit the parallelism of the BuildKit solver, which is particularly useful
+for low-powered machines, using a [BuildKit daemon configuration](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md)
+while creating a builder with the [`--config` flags](https://docs.docker.com/engine/reference/commandline/buildx_create/#config).
+
+```toml
+# /etc/buildkitd.toml
+[worker.oci]
+  max-parallelism = 4
+```
+
+Now you can [create a `docker-container` builder](https://docs.docker.com/engine/reference/commandline/buildx_create/)
+that will use this BuildKit configuration to limit parallelism.
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --config /etc/buildkitd.toml
+```
+
+## Limit on TCP connections
+
+We are also now limiting TCP connections to **4 per registry** with an additional
+connection not used for layer pulls and pushes. This limitation will be able to
+manage TCP connection per host to avoid your build being stuck while pulling
+images. The additional connection is used for metadata requests
+(image config retrieval) to enhance the overall build time.
+
+More info: [moby/buildkit#2259](https://github.com/moby/buildkit/pull/2259)

docs/reference/buildx.md

@@ -0,0 +1,43 @@
+# buildx
+
+```
+docker buildx [OPTIONS] COMMAND
+```
+
+<!---MARKER_GEN_START-->
+Extended build capabilities with BuildKit
+
+### Subcommands
+
+| Name | Description |
+| --- | --- |
+| [`bake`](buildx_bake.md) | Build from a file |
+| [`build`](buildx_build.md) | Start a build |
+| [`create`](buildx_create.md) | Create a new builder instance |
+| [`du`](buildx_du.md) | Disk usage |
+| [`imagetools`](buildx_imagetools.md) | Commands to work on images in registry |
+| [`inspect`](buildx_inspect.md) | Inspect current builder instance |
+| [`install`](buildx_install.md) | Install buildx as a 'docker builder' alias |
+| [`ls`](buildx_ls.md) | List builder instances |
+| [`prune`](buildx_prune.md) | Remove build cache |
+| [`rm`](buildx_rm.md) | Remove a builder instance |
+| [`stop`](buildx_stop.md) | Stop builder instance |
+| [`uninstall`](buildx_uninstall.md) | Uninstall the 'docker builder' alias |
+| [`use`](buildx_use.md) | Set the current builder instance |
+| [`version`](buildx_version.md) | Show buildx version information |
+
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+
+
+<!---MARKER_GEN_END-->
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+You can also use the `BUILDX_BUILDER` environment variable.

docs/reference/buildx_bake.md

@@ -0,0 +1,164 @@
+# buildx bake
+
+```
+docker buildx bake [OPTIONS] [TARGET...]
+```
+
+<!---MARKER_GEN_START-->
+Build from a file
+
+### Aliases
+
+`docker buildx bake`, `docker buildx f`
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| [`-f`](#file), [`--file`](#file) | `stringArray` |  | Build definition file |
+| `--load` |  |  | Shorthand for `--set=*.output=type=docker` |
+| `--metadata-file` | `string` |  | Write build result metadata to the file |
+| [`--no-cache`](#no-cache) |  |  | Do not use cache when building the image |
+| [`--print`](#print) |  |  | Print the options without building |
+| [`--progress`](#progress) | `string` | `auto` | Set type of progress output (`auto`, `plain`, `tty`). Use plain to show container output |
+| [`--pull`](#pull) |  |  | Always attempt to pull all referenced images |
+| `--push` |  |  | Shorthand for `--set=*.output=type=registry` |
+| [`--set`](#set) | `stringArray` |  | Override target value (e.g., `targetpattern.key=value`) |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Bake is a high-level build command. Each specified target will run in parallel
+as part of the build.
+
+Read [High-level build options with Bake](https://docs.docker.com/build/bake/)
+guide for introduction to writing bake files.
+
+> **Note**
+>
+> `buildx bake` command may receive backwards incompatible features in the future
+> if needed. We are looking for feedback on improving the command and extending
+> the functionality further.
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### <a name="file"></a> Specify a build definition file (-f, --file)
+
+Use the `-f` / `--file` option to specify the build definition file to use.
+The file can be an HCL, JSON or Compose file. If multiple files are specified
+they are all read and configurations are combined.
+
+You can pass the names of the targets to build, to build only specific target(s).
+The following example builds the `db` and `webapp-release` targets that are
+defined in the `docker-bake.dev.hcl` file:
+
+```hcl
+# docker-bake.dev.hcl
+group "default" {
+  targets = ["db", "webapp-dev"]
+}
+
+target "webapp-dev" {
+  dockerfile = "Dockerfile.webapp"
+  tags = ["docker.io/username/webapp"]
+}
+
+target "webapp-release" {
+  inherits = ["webapp-dev"]
+  platforms = ["linux/amd64", "linux/arm64"]
+}
+
+target "db" {
+  dockerfile = "Dockerfile.db"
+  tags = ["docker.io/username/db"]
+}
+```
+
+```console
+$ docker buildx bake -f docker-bake.dev.hcl db webapp-release
+```
+
+See our [file definition](https://docs.docker.com/build/bake/file-definition/)
+guide for more details.
+
+### <a name="no-cache"></a> Do not use cache when building the image (--no-cache)
+
+Same as `build --no-cache`. Do not use cache when building the image.
+
+### <a name="print"></a> Print the options without building (--print)
+
+Prints the resulting options of the targets desired to be built, in a JSON
+format, without starting a build.
+
+```console
+$ docker buildx bake -f docker-bake.hcl --print db
+{
+  "group": {
+    "default": {
+      "targets": [
+        "db"
+      ]
+    }
+  },
+  "target": {
+    "db": {
+      "context": "./",
+      "dockerfile": "Dockerfile",
+      "tags": [
+        "docker.io/tiborvass/db"
+      ]
+    }
+  }
+}
+```
+
+### <a name="progress"></a> Set type of progress output (--progress)
+
+Same as [`build --progress`](buildx_build.md#progress).
+
+### <a name="pull"></a> Always attempt to pull a newer version of the image (--pull)
+
+Same as `build --pull`.
+
+### <a name="set"></a> Override target configurations from command line (--set)
+
+```
+--set targetpattern.key[.subkey]=value
+```
+
+Override target configurations from command line. The pattern matching syntax
+is defined in https://golang.org/pkg/path/#Match.
+
+```console
+$ docker buildx bake --set target.args.mybuildarg=value
+$ docker buildx bake --set target.platform=linux/arm64
+$ docker buildx bake --set foo*.args.mybuildarg=value # overrides build arg for all targets starting with 'foo'
+$ docker buildx bake --set *.platform=linux/arm64     # overrides platform for all targets
+$ docker buildx bake --set foo*.no-cache              # bypass caching only for targets starting with 'foo'
+```
+
+Complete list of overridable fields:
+
+* `args`
+* `cache-from`
+* `cache-to`
+* `context`
+* `dockerfile`
+* `labels`
+* `no-cache`
+* `no-cache-filter`
+* `output`
+* `platform`
+* `pull`
+* `push`
+* `secrets`
+* `ssh`
+* `tags`
+* `target`

docs/reference/buildx_build.md

@@ -0,0 +1,546 @@
+# buildx build
+
+```
+docker buildx build [OPTIONS] PATH | URL | -
+```
+
+<!---MARKER_GEN_START-->
+Start a build
+
+### Aliases
+
+`docker buildx build`, `docker buildx b`
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--add-host`](https://docs.docker.com/engine/reference/commandline/build/#add-entries-to-container-hosts-file---add-host) | `stringSlice` |  | Add a custom host-to-IP mapping (format: `host:ip`) |
+| [`--allow`](#allow) | `stringSlice` |  | Allow extra privileged entitlement (e.g., `network.host`, `security.insecure`) |
+| [`--build-arg`](#build-arg) | `stringArray` |  | Set build-time variables |
+| [`--build-context`](#build-context) | `stringArray` |  | Additional build contexts (e.g., name=path) |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| [`--cache-from`](#cache-from) | `stringArray` |  | External cache sources (e.g., `user/app:cache`, `type=local,src=path/to/dir`) |
+| [`--cache-to`](#cache-to) | `stringArray` |  | Cache export destinations (e.g., `user/app:cache`, `type=local,dest=path/to/dir`) |
+| [`--cgroup-parent`](https://docs.docker.com/engine/reference/commandline/build/#use-a-custom-parent-cgroup---cgroup-parent) | `string` |  | Optional parent cgroup for the container |
+| [`-f`](https://docs.docker.com/engine/reference/commandline/build/#specify-a-dockerfile--f), [`--file`](https://docs.docker.com/engine/reference/commandline/build/#specify-a-dockerfile--f) | `string` |  | Name of the Dockerfile (default: `PATH/Dockerfile`) |
+| `--iidfile` | `string` |  | Write the image ID to the file |
+| `--label` | `stringArray` |  | Set metadata for an image |
+| [`--load`](#load) |  |  | Shorthand for `--output=type=docker` |
+| [`--metadata-file`](#metadata-file) | `string` |  | Write build result metadata to the file |
+| `--network` | `string` | `default` | Set the networking mode for the `RUN` instructions during build |
+| `--no-cache` |  |  | Do not use cache when building the image |
+| `--no-cache-filter` | `stringArray` |  | Do not cache specified stages |
+| [`-o`](#output), [`--output`](#output) | `stringArray` |  | Output destination (format: `type=local,dest=path`) |
+| [`--platform`](#platform) | `stringArray` |  | Set target platform for build |
+| [`--progress`](#progress) | `string` | `auto` | Set type of progress output (`auto`, `plain`, `tty`). Use plain to show container output |
+| `--pull` |  |  | Always attempt to pull all referenced images |
+| [`--push`](#push) |  |  | Shorthand for `--output=type=registry` |
+| `-q`, `--quiet` |  |  | Suppress the build output and print image ID on success |
+| [`--secret`](#secret) | `stringArray` |  | Secret to expose to the build (format: `id=mysecret[,src=/local/secret]`) |
+| [`--shm-size`](#shm-size) | `bytes` | `0` | Size of `/dev/shm` |
+| [`--ssh`](#ssh) | `stringArray` |  | SSH agent socket or keys to expose to the build (format: `default\|<id>[=<socket>\|<key>[,<key>]]`) |
+| [`-t`](https://docs.docker.com/engine/reference/commandline/build/#tag-an-image--t), [`--tag`](https://docs.docker.com/engine/reference/commandline/build/#tag-an-image--t) | `stringArray` |  | Name and optionally a tag (format: `name:tag`) |
+| [`--target`](https://docs.docker.com/engine/reference/commandline/build/#specifying-target-build-stage---target) | `string` |  | Set the target build stage to build |
+| [`--ulimit`](#ulimit) | `ulimit` |  | Ulimit options |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+The `buildx build` command starts a build using BuildKit. This command is similar
+to the UI of `docker build` command and takes the same flags and arguments.
+
+For documentation on most of these flags, refer to the [`docker build`
+documentation](https://docs.docker.com/engine/reference/commandline/build/). In
+here we'll document a subset of the new flags.
+
+## Examples
+
+### <a name="allow"></a> Allow extra privileged entitlement (--allow)
+
+```
+--allow=ENTITLEMENT
+```
+
+Allow extra privileged entitlement. List of entitlements:
+
+- `network.host` - Allows executions with host networking.
+- `security.insecure` - Allows executions without sandbox. See
+  [related Dockerfile extensions](https://docs.docker.com/engine/reference/builder/#run---securitysandbox).
+
+For entitlements to be enabled, the `buildkitd` daemon also needs to allow them
+with `--allow-insecure-entitlement` (see [`create --buildkitd-flags`](buildx_create.md#buildkitd-flags))
+
+**Examples**
+
+```console
+$ docker buildx create --use --name insecure-builder --buildkitd-flags '--allow-insecure-entitlement security.insecure'
+$ docker buildx build --allow security.insecure .
+```
+
+### <a name="build-arg"></a> Set build-time variables (--build-arg)
+
+Same as [`docker build` command](https://docs.docker.com/engine/reference/commandline/build/#set-build-time-variables---build-arg).
+
+There are also useful built-in build args like:
+
+* `BUILDKIT_CONTEXT_KEEP_GIT_DIR=<bool>` trigger git context to keep the `.git` directory
+* `BUILDKIT_INLINE_BUILDINFO_ATTRS=<bool>` inline build info attributes in image config or not
+* `BUILDKIT_INLINE_CACHE=<bool>` inline cache metadata to image config or not
+* `BUILDKIT_MULTI_PLATFORM=<bool>` opt into deterministic output regardless of multi-platform output or not
+
+```console
+$ docker buildx build --build-arg BUILDKIT_MULTI_PLATFORM=1 .
+```
+
+> **Note**
+>
+> More built-in build args can be found in [Dockerfile reference docs](https://docs.docker.com/engine/reference/builder/#buildkit-built-in-build-args).
+
+### <a name="build-context"></a> Additional build contexts (--build-context)
+
+```
+--build-context=name=VALUE
+```
+
+Define additional build context with specified contents. In Dockerfile the context can be accessed when `FROM name` or `--from=name` is used.
+When Dockerfile defines a stage with the same name it is overwritten.
+
+The value can be a local source directory, [local OCI layout compliant directory](https://github.com/opencontainers/image-spec/blob/main/image-layout.md), container image (with docker-image:// prefix), Git or HTTP URL.
+
+Replace `alpine:latest` with a pinned one:
+
+```console
+$ docker buildx build --build-context alpine=docker-image://alpine@sha256:0123456789 .
+```
+
+Expose a secondary local source directory:
+
+```console
+$ docker buildx build --build-context project=path/to/project/source .
+# docker buildx build --build-context project=https://github.com/myuser/project.git .
+```
+
+```Dockerfile
+FROM alpine
+COPY --from=project myfile /
+```
+
+#### <a name="source-oci-layout"></a> Source image from OCI layout directory
+
+Source an image from a local [OCI layout compliant directory](https://github.com/opencontainers/image-spec/blob/main/image-layout.md):
+
+```console
+$ docker buildx build --build-context foo=oci-layout:///path/to/local/layout@sha256:abcd12345 .
+```
+
+```Dockerfile
+FROM alpine
+RUN apk add git
+
+COPY --from=foo myfile /
+
+FROM foo
+```
+
+The OCI layout directory must be compliant with the [OCI layout specification](https://github.com/opencontainers/image-spec/blob/main/image-layout.md). It looks _solely_ for hashes. It does not
+do any form of `image:tag` resolution to find the hash of the manifest; that is up to you.
+
+The format of the `--build-context` must be: `<context>=oci-layout://<path-to-local-layout>@sha256:<hash-of-manifest>`, where:
+
+* `context` is the name of the build context as used in the `Dockerfile`.
+* `path-to-local-layout` is the path on the local machine, where you are running `docker build`, to the spec-compliant OCI layout.
+* `hash-of-manifest` is the hash of the manifest for the image. It can be a single-architecture manifest or a multi-architecture index.
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### <a name="cache-from"></a> Use an external cache source for a build (--cache-from)
+
+```
+--cache-from=[NAME|type=TYPE[,KEY=VALUE]]
+```
+
+Use an external cache source for a build. Supported types are `registry`,
+`local` and `gha`.
+
+- [`registry` source](https://github.com/moby/buildkit#registry-push-image-and-cache-separately)
+  can import cache from a cache manifest or (special) image configuration on the
+  registry.
+- [`local` source](https://github.com/moby/buildkit#local-directory-1) can
+  import cache from local files previously exported with `--cache-to`.
+- [`gha` source](https://github.com/moby/buildkit#github-actions-cache-experimental)
+  can import cache from a previously exported cache with `--cache-to` in your
+  GitHub repository
+
+If no type is specified, `registry` exporter is used with a specified reference.
+
+`docker` driver currently only supports importing build cache from the registry.
+
+```console
+$ docker buildx build --cache-from=user/app:cache .
+$ docker buildx build --cache-from=user/app .
+$ docker buildx build --cache-from=type=registry,ref=user/app .
+$ docker buildx build --cache-from=type=local,src=path/to/cache .
+$ docker buildx build --cache-from=type=gha .
+```
+
+More info about cache exporters and available attributes: https://github.com/moby/buildkit#export-cache
+
+### <a name="cache-to"></a> Export build cache to an external cache destination (--cache-to)
+
+```
+--cache-to=[NAME|type=TYPE[,KEY=VALUE]]
+```
+
+Export build cache to an external cache destination. Supported types are
+`registry`, `local`, `inline` and `gha`.
+
+- [`registry` type](https://github.com/moby/buildkit#registry-push-image-and-cache-separately) exports build cache to a cache manifest in the registry.
+- [`local` type](https://github.com/moby/buildkit#local-directory-1) type
+  exports cache to a local directory on the client.
+- [`inline` type](https://github.com/moby/buildkit#inline-push-image-and-cache-together)
+  type writes the cache metadata into the image configuration.
+- [`gha` type](https://github.com/moby/buildkit#github-actions-cache-experimental)
+  type exports cache through the [Github Actions Cache service API](https://github.com/tonistiigi/go-actions-cache/blob/master/api.md#authentication).
+
+`docker` driver currently only supports exporting inline cache metadata to image
+configuration. Alternatively, `--build-arg BUILDKIT_INLINE_CACHE=1` can be used
+to trigger inline cache exporter.
+
+Attribute key:
+
+- `mode` - Specifies how many layers are exported with the cache. `min` on only
+  exports layers already in the final build stage, `max` exports layers for
+  all stages. Metadata is always exported for the whole build.
+
+```console
+$ docker buildx build --cache-to=user/app:cache .
+$ docker buildx build --cache-to=type=inline .
+$ docker buildx build --cache-to=type=registry,ref=user/app .
+$ docker buildx build --cache-to=type=local,dest=path/to/cache .
+$ docker buildx build --cache-to=type=gha .
+```
+
+More info about cache exporters and available attributes: https://github.com/moby/buildkit#export-cache
+
+### <a name="load"></a> Load the single-platform build result to `docker images` (--load)
+
+Shorthand for [`--output=type=docker`](#docker). Will automatically load the
+single-platform build result to `docker images`.
+
+### <a name="metadata-file"></a> Write build result metadata to the file (--metadata-file)
+
+To output build metadata such as the image digest, pass the `--metadata-file` flag.
+The metadata will be written as a JSON object to the specified file. The
+directory of the specified file must already exist and be writable.
+
+```console
+$ docker buildx build --load --metadata-file metadata.json .
+$ cat metadata.json
+```
+```json
+{
+  "containerimage.buildinfo": {
+    "frontend": "dockerfile.v0",
+    "attrs": {
+      "context": "https://github.com/crazy-max/buildkit-buildsources-test.git#master",
+      "filename": "Dockerfile",
+      "source": "docker/dockerfile:master"
+    },
+    "sources": [
+      {
+        "type": "docker-image",
+        "ref": "docker.io/docker/buildx-bin:0.6.1@sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0",
+        "pin": "sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0"
+      },
+      {
+        "type": "docker-image",
+        "ref": "docker.io/library/alpine:3.13",
+        "pin": "sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c"
+      }
+    ]
+  },
+  "containerimage.config.digest": "sha256:2937f66a9722f7f4a2df583de2f8cb97fc9196059a410e7f00072fc918930e66",
+  "containerimage.descriptor": {
+    "annotations": {
+      "config.digest": "sha256:2937f66a9722f7f4a2df583de2f8cb97fc9196059a410e7f00072fc918930e66",
+      "org.opencontainers.image.created": "2022-02-08T21:28:03Z"
+    },
+    "digest": "sha256:19ffeab6f8bc9293ac2c3fdf94ebe28396254c993aea0b5a542cfb02e0883fa3",
+    "mediaType": "application/vnd.oci.image.manifest.v1+json",
+    "size": 506
+  },
+  "containerimage.digest": "sha256:19ffeab6f8bc9293ac2c3fdf94ebe28396254c993aea0b5a542cfb02e0883fa3"
+}
+```
+
+### <a name="output"></a> Set the export action for the build result (-o, --output)
+
+```
+-o, --output=[PATH,-,type=TYPE[,KEY=VALUE]
+```
+
+Sets the export action for the build result. In `docker build` all builds finish
+by creating a container image and exporting it to `docker images`. `buildx` makes
+this step configurable allowing results to be exported directly to the client,
+oci image tarballs, registry etc.
+
+Buildx with `docker` driver currently only supports local, tarball exporter and
+image exporter. `docker-container` driver supports all the exporters.
+
+If just the path is specified as a value, `buildx` will use the local exporter
+with this path as the destination. If the value is "-", `buildx` will use `tar`
+exporter and write to `stdout`.
+
+```console
+$ docker buildx build -o . .
+$ docker buildx build -o outdir .
+$ docker buildx build -o - - > out.tar
+$ docker buildx build -o type=docker .
+$ docker buildx build -o type=docker,dest=- . > myimage.tar
+$ docker buildx build -t tonistiigi/foo -o type=registry
+```
+
+Supported exported types are:
+
+#### `local`
+
+The `local` export type writes all result files to a directory on the client. The
+new files will be owned by the current user. On multi-platform builds, all results
+will be put in subdirectories by their platform.
+
+Attribute key:
+
+- `dest` - destination directory where files will be written
+
+#### `tar`
+
+The `tar` export type writes all result files as a single tarball on the client.
+On multi-platform builds all results will be put in subdirectories by their platform.
+
+Attribute key:
+
+- `dest` - destination path where tarball will be written. “-” writes to stdout.
+
+#### `oci`
+
+The `oci` export type writes the result image or manifest list as an [OCI image
+layout](https://github.com/opencontainers/image-spec/blob/v1.0.1/image-layout.md)
+tarball on the client.
+
+Attribute key:
+
+- `dest` - destination path where tarball will be written. “-” writes to stdout.
+
+#### `docker`
+
+The `docker` export type writes the single-platform result image as a [Docker image
+specification](https://github.com/docker/docker/blob/v20.10.2/image/spec/v1.2.md)
+tarball on the client. Tarballs created by this exporter are also OCI compatible.
+
+Currently, multi-platform images cannot be exported with the `docker` export type.
+The most common usecase for multi-platform images is to directly push to a registry
+(see [`registry`](#registry)).
+
+Attribute keys:
+
+- `dest` - destination path where tarball will be written. If not specified the
+  tar will be loaded automatically to the current docker instance.
+- `context` - name for the docker context where to import the result
+
+#### `image`
+
+The `image` exporter writes the build result as an image or a manifest list. When
+using `docker` driver the image will appear in `docker images`. Optionally, image
+can be automatically pushed to a registry by specifying attributes.
+
+Attribute keys:
+
+- `name` - name (references) for the new image.
+- `push` - boolean to automatically push the image.
+
+#### `registry`
+
+The `registry` exporter is a shortcut for `type=image,push=true`.
+
+### <a name="platform"></a> Set the target platforms for the build (--platform)
+
+```
+--platform=value[,value]
+```
+
+Set the target platform for the build. All `FROM` commands inside the Dockerfile
+without their own `--platform` flag will pull base images for this platform and
+this value will also be the platform of the resulting image. The default value
+will be the current platform of the buildkit daemon.
+
+When using `docker-container` driver with `buildx`, this flag can accept multiple
+values as an input separated by a comma. With multiple values the result will be
+built for all of the specified platforms and joined together into a single manifest
+list.
+
+If the `Dockerfile` needs to invoke the `RUN` command, the builder needs runtime
+support for the specified platform. In a clean setup, you can only execute `RUN`
+commands for your system architecture.
+If your kernel supports [`binfmt_misc`](https://en.wikipedia.org/wiki/Binfmt_misc)
+launchers for secondary architectures, buildx will pick them up automatically.
+Docker desktop releases come with `binfmt_misc` automatically configured for `arm64`
+and `arm` architectures. You can see what runtime platforms your current builder
+instance supports by running `docker buildx inspect --bootstrap`.
+
+Inside a `Dockerfile`, you can access the current platform value through
+`TARGETPLATFORM` build argument. Please refer to the [`docker build`
+documentation](https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope)
+for the full description of automatic platform argument variants .
+
+The formatting for the platform specifier is defined in the [containerd source
+code](https://github.com/containerd/containerd/blob/v1.4.3/platforms/platforms.go#L63).
+
+```console
+$ docker buildx build --platform=linux/arm64 .
+$ docker buildx build --platform=linux/amd64,linux/arm64,linux/arm/v7 .
+$ docker buildx build --platform=darwin .
+```
+
+### <a name="progress"></a> Set type of progress output (--progress)
+
+```
+--progress=VALUE
+```
+
+Set type of progress output (auto, plain, tty). Use plain to show container
+output (default "auto").
+
+> **Note**
+>
+> You can also use the `BUILDKIT_PROGRESS` environment variable to set its value.
+
+The following example uses `plain` output during the build:
+
+```console
+$ docker buildx build --load --progress=plain .
+
+#1 [internal] load build definition from Dockerfile
+#1 transferring dockerfile: 227B 0.0s done
+#1 DONE 0.1s
+
+#2 [internal] load .dockerignore
+#2 transferring context: 129B 0.0s done
+#2 DONE 0.0s
+...
+```
+
+> **Note**
+>
+> Check also our [Color output controls guide](https://github.com/docker/buildx/blob/master/docs/guides/color-output.md)
+> for modifying the colors that are used to output information to the terminal.
+
+### <a name="push"></a> Push the build result to a registry (--push)
+
+Shorthand for [`--output=type=registry`](#registry). Will automatically push the
+build result to registry.
+
+### <a name="secret"></a> Secret to expose to the build (--secret)
+
+```
+--secret=[type=TYPE[,KEY=VALUE]
+```
+
+Exposes secret to the build. The secret can be used by the build using
+[`RUN --mount=type=secret` mount](https://docs.docker.com/engine/reference/builder/#run---mounttypesecret).
+
+If `type` is unset it will be detected. Supported types are:
+
+#### `file`
+
+Attribute keys:
+
+- `id` - ID of the secret. Defaults to basename of the `src` path.
+- `src`, `source` - Secret filename. `id` used if unset.
+
+```dockerfile
+# syntax=docker/dockerfile:1.4
+FROM python:3
+RUN pip install awscli
+RUN --mount=type=secret,id=aws,target=/root/.aws/credentials \
+  aws s3 cp s3://... ...
+```
+
+```console
+$ docker buildx build --secret id=aws,src=$HOME/.aws/credentials .
+```
+
+#### `env`
+
+Attribute keys:
+
+- `id` - ID of the secret. Defaults to `env` name.
+- `env` - Secret environment variable. `id` used if unset, otherwise will look for `src`, `source` if `id` unset.
+
+```dockerfile
+# syntax=docker/dockerfile:1.4
+FROM node:alpine
+RUN --mount=type=bind,target=. \
+  --mount=type=secret,id=SECRET_TOKEN \
+  SECRET_TOKEN=$(cat /run/secrets/SECRET_TOKEN) yarn run test
+```
+
+```console
+$ SECRET_TOKEN=token docker buildx build --secret id=SECRET_TOKEN .
+```
+
+### <a name="shm-size"></a> Size of /dev/shm (--shm-size)
+
+The format is `<number><unit>`. `number` must be greater than `0`. Unit is
+optional and can be `b` (bytes), `k` (kilobytes), `m` (megabytes), or `g`
+(gigabytes). If you omit the unit, the system uses bytes.
+
+### <a name="ssh"></a> SSH agent socket or keys to expose to the build (--ssh)
+
+```
+--ssh=default|<id>[=<socket>|<key>[,<key>]]
+```
+
+This can be useful when some commands in your Dockerfile need specific SSH
+authentication (e.g., cloning a private repository).
+
+`--ssh` exposes SSH agent socket or keys to the build and can be used with the
+[`RUN --mount=type=ssh` mount](https://docs.docker.com/engine/reference/builder/#run---mounttypessh).
+
+Example to access Gitlab using an SSH agent socket:
+
+```dockerfile
+# syntax=docker/dockerfile:1.4
+FROM alpine
+RUN apk add --no-cache openssh-client
+RUN mkdir -p -m 0700 ~/.ssh && ssh-keyscan gitlab.com >> ~/.ssh/known_hosts
+RUN --mount=type=ssh ssh -q -T git@gitlab.com 2>&1 | tee /hello
+# "Welcome to GitLab, @GITLAB_USERNAME_ASSOCIATED_WITH_SSHKEY" should be printed here
+# with the type of build progress is defined as `plain`.
+```
+
+```console
+$ eval $(ssh-agent)
+$ ssh-add ~/.ssh/id_rsa
+(Input your passphrase here)
+$ docker buildx build --ssh default=$SSH_AUTH_SOCK .
+```
+
+### <a name="ulimit"></a> Set ulimits (--ulimit)
+
+`--ulimit` is specified with a soft and hard limit as such:
+`<type>=<soft limit>[:<hard limit>]`, for example:
+
+```console
+$ docker buildx build --ulimit nofile=1024:1024 .
+```
+
+> **Note**
+>
+> If you do not provide a `hard limit`, the `soft limit` is used
+> for both values. If no `ulimits` are set, they are inherited from
+> the default `ulimits` set on the daemon.

docs/reference/buildx_create.md

@@ -0,0 +1,229 @@
+# buildx create
+
+```
+docker buildx create [OPTIONS] [CONTEXT|ENDPOINT]
+```
+
+<!---MARKER_GEN_START-->
+Create a new builder instance
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--append`](#append) |  |  | Append a node to builder instead of changing it |
+| `--bootstrap` |  |  | Boot builder after creation |
+| [`--buildkitd-flags`](#buildkitd-flags) | `string` |  | Flags for buildkitd daemon |
+| [`--config`](#config) | `string` |  | BuildKit config file |
+| [`--driver`](#driver) | `string` |  | Driver to use (available: `docker`, `docker-container`, `kubernetes`, `remote`) |
+| [`--driver-opt`](#driver-opt) | `stringArray` |  | Options for the driver |
+| [`--leave`](#leave) |  |  | Remove a node from builder instead of changing it |
+| [`--name`](#name) | `string` |  | Builder instance name |
+| [`--node`](#node) | `string` |  | Create/modify node with given name |
+| [`--platform`](#platform) | `stringArray` |  | Fixed platforms for current node |
+| [`--use`](#use) |  |  | Set the current builder instance |
+
+
+<!---MARKER_GEN_END-->
+
+
+## Description
+
+Create makes a new builder instance pointing to a docker context or endpoint,
+where context is the name of a context from `docker context ls` and endpoint is
+the address for docker socket (eg. `DOCKER_HOST` value).
+
+By default, the current Docker configuration is used for determining the
+context/endpoint value.
+
+Builder instances are isolated environments where builds can be invoked. All
+Docker contexts also get the default builder instance.
+
+## Examples
+
+### <a name="append"></a> Append a new node to an existing builder (--append)
+
+The `--append` flag changes the action of the command to append a new node to an
+existing builder specified by `--name`. Buildx will choose an appropriate node
+for a build based on the platforms it supports.
+
+```console
+$ docker buildx create mycontext1
+eager_beaver
+
+$ docker buildx create --name eager_beaver --append mycontext2
+eager_beaver
+```
+
+### <a name="buildkitd-flags"></a> Specify options for the buildkitd daemon (--buildkitd-flags)
+
+```
+--buildkitd-flags FLAGS
+```
+
+Adds flags when starting the buildkitd daemon. They take precedence over the
+configuration file specified by [`--config`](#config). See `buildkitd --help`
+for the available flags.
+
+```
+--buildkitd-flags '--debug --debugaddr 0.0.0.0:6666'
+```
+
+### <a name="config"></a> Specify a configuration file for the buildkitd daemon (--config)
+
+```
+--config FILE
+```
+
+Specifies the configuration file for the buildkitd daemon to use. The configuration
+can be overridden by [`--buildkitd-flags`](#buildkitd-flags).
+See an [example buildkitd configuration file](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md).
+
+If the configuration file is not specified, will look for one by default in:
+* `$BUILDX_CONFIG/buildkitd.default.toml`
+* `$DOCKER_CONFIG/buildx/buildkitd.default.toml`
+* `~/.docker/buildx/buildkitd.default.toml`
+
+Note that if you create a `docker-container` builder and have specified
+certificates for registries in the `buildkitd.toml` configuration, the files
+will be copied into the container under `/etc/buildkit/certs` and configuration
+will be updated to reflect that.
+
+### <a name="driver"></a> Set the builder driver to use (--driver)
+
+```
+--driver DRIVER
+```
+
+Sets the builder driver to be used. There are two available drivers, each have
+their own specificities.
+
+#### `docker` driver
+
+Uses the builder that is built into the docker daemon. With this driver,
+the [`--load`](buildx_build.md#load) flag is implied by default on
+`buildx build`. However, building multi-platform images or exporting cache is
+not currently supported.
+
+#### `docker-container` driver
+
+Uses a BuildKit container that will be spawned via docker. With this driver,
+both building multi-platform images and exporting cache are supported.
+
+Unlike `docker` driver, built images will not automatically appear in
+`docker images` and [`build --load`](buildx_build.md#load) needs to be used
+to achieve that.
+
+#### `kubernetes` driver
+
+Uses a kubernetes pods. With this driver, you can spin up pods with defined
+BuildKit container image to build your images.
+
+Unlike `docker` driver, built images will not automatically appear in
+`docker images` and [`build --load`](buildx_build.md#load) needs to be used
+to achieve that.
+
+#### `remote` driver
+
+Uses a remote instance of buildkitd over an arbitrary connection. With this
+driver, you manually create and manage instances of buildkit yourself, and
+configure buildx to point at it.
+
+Unlike `docker` driver, built images will not automatically appear in
+`docker images` and [`build --load`](buildx_build.md#load) needs to be used
+to achieve that.
+
+### <a name="driver-opt"></a> Set additional driver-specific options (--driver-opt)
+
+```
+--driver-opt OPTIONS
+```
+
+Passes additional driver-specific options.
+
+Note: When using quoted values for example for the `nodeselector` or
+`tolerations` options, ensure that quotes are escaped correctly for your shell.
+
+#### `docker` driver
+
+No driver options.
+
+#### `docker-container` driver
+
+- `image=IMAGE` - Sets the container image to be used for running buildkit.
+- `network=NETMODE` - Sets the network mode for running the buildkit container.
+- `cgroup-parent=CGROUP` - Sets the cgroup parent of the buildkit container if docker is using the "cgroupfs" driver. Defaults to `/docker/buildx`.
+
+#### `kubernetes` driver
+
+- `image=IMAGE` - Sets the container image to be used for running buildkit.
+- `namespace=NS` - Sets the Kubernetes namespace. Defaults to the current namespace.
+- `replicas=N` - Sets the number of `Pod` replicas. Defaults to 1.
+- `requests.cpu` - Sets the request CPU value specified in units of Kubernetes CPU. Example `requests.cpu=100m`, `requests.cpu=2`
+- `requests.memory` - Sets the request memory value specified in bytes or with a valid suffix. Example `requests.memory=500Mi`, `requests.memory=4G`
+- `limits.cpu` - Sets the limit CPU value specified in units of Kubernetes CPU. Example `limits.cpu=100m`, `limits.cpu=2`
+- `limits.memory` - Sets the limit memory value specified in bytes or with a valid suffix. Example `limits.memory=500Mi`, `limits.memory=4G`
+- `"nodeselector=label1=value1,label2=value2"` - Sets the kv of `Pod` nodeSelector. No Defaults. Example `nodeselector=kubernetes.io/arch=arm64`
+- `"tolerations=key=foo,value=bar;key=foo2,operator=exists;key=foo3,effect=NoSchedule"` - Sets the `Pod` tolerations. Accepts the same values as the kube manifest tolera>tions. Key-value pairs are separated by `,`, tolerations are separated by `;`. No Defaults. Example `tolerations=operator=exists`
+- `rootless=(true|false)` - Run the container as a non-root user without `securityContext.privileged`. Needs Kubernetes 1.19 or later. [Using Ubuntu host kernel is recommended](https://github.com/moby/buildkit/blob/master/docs/rootless.md). Defaults to false.
+- `loadbalance=(sticky|random)` - Load-balancing strategy. If set to "sticky", the pod is chosen using the hash of the context path. Defaults to "sticky"
+- `qemu.install=(true|false)` - Install QEMU emulation for multi platforms support.
+- `qemu.image=IMAGE` - Sets the QEMU emulation image. Defaults to `tonistiigi/binfmt:latest`
+
+#### `remote` driver
+
+- `key=KEY` - Sets the TLS client key.
+- `cert=CERT` - Sets the TLS client certificate to present to buildkitd.
+- `cacert=CACERT` - Sets the TLS certificate authority used for validation.
+- `servername=SERVER` - Sets the TLS server name to be used in requests (defaults to the endpoint hostname).
+
+### <a name="leave"></a> Remove a node from a builder (--leave)
+
+The `--leave` flag changes the action of the command to remove a node from a
+builder. The builder needs to be specified with `--name` and node that is removed
+is set with `--node`.
+
+```console
+$ docker buildx create --name mybuilder --node mybuilder0 --leave
+```
+
+### <a name="name"></a> Specify the name of the builder (--name)
+
+```
+--name NAME
+```
+
+The `--name` flag specifies the name of the builder to be created or modified.
+If none is specified, one will be automatically generated.
+
+### <a name="node"></a> Specify the name of the node (--node)
+
+```
+--node NODE
+```
+
+The `--node` flag specifies the name of the node to be created or modified. If
+none is specified, it is the name of the builder it belongs to, with an index
+number suffix.
+
+### <a name="platform"></a> Set the platforms supported by the node (--platform)
+
+```
+--platform PLATFORMS
+```
+
+The `--platform` flag sets the platforms supported by the node. It expects a
+comma-separated list of platforms of the form OS/architecture/variant. The node
+will also automatically detect the platforms it supports, but manual values take
+priority over the detected ones and can be used when multiple nodes support
+building for the same platform.
+
+```console
+$ docker buildx create --platform linux/amd64
+$ docker buildx create --platform linux/arm64,linux/arm/v8
+```
+
+### <a name="use"></a> Automatically switch to the newly created builder (--use)
+
+The `--use` flag automatically switches the current builder to the newly created
+one. Equivalent to running `docker buildx use $(docker buildx create ...)`.

docs/reference/buildx_du.md

@@ -0,0 +1,25 @@
+# buildx du
+
+```
+docker buildx du
+```
+
+<!---MARKER_GEN_START-->
+Disk usage
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| `--filter` | `filter` |  | Provide filter values |
+| `--verbose` |  |  | Provide a more verbose output |
+
+
+<!---MARKER_GEN_END-->
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).

docs/reference/buildx_imagetools.md

@@ -0,0 +1,36 @@
+# buildx imagetools
+
+```
+docker buildx imagetools [OPTIONS] COMMAND
+```
+
+<!---MARKER_GEN_START-->
+Commands to work on images in registry
+
+### Subcommands
+
+| Name | Description |
+| --- | --- |
+| [`create`](buildx_imagetools_create.md) | Create a new image based on source images |
+| [`inspect`](buildx_imagetools_inspect.md) | Show details of an image in the registry |
+
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Imagetools contains commands for working with manifest lists in the registry.
+These commands are useful for inspecting multi-platform build results.
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).

docs/reference/buildx_imagetools_create.md

@@ -0,0 +1,78 @@
+# buildx imagetools create
+
+```
+docker buildx imagetools create [OPTIONS] [SOURCE] [SOURCE...]
+```
+
+<!---MARKER_GEN_START-->
+Create a new image based on source images
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--append`](#append) |  |  | Append to existing manifest |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| [`--dry-run`](#dry-run) |  |  | Show final image instead of pushing |
+| [`-f`](#file), [`--file`](#file) | `stringArray` |  | Read source descriptor from file |
+| `--progress` | `string` | `auto` | Set type of progress output (`auto`, `plain`, `tty`). Use plain to show container output |
+| [`-t`](#tag), [`--tag`](#tag) | `stringArray` |  | Set reference for new image |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Create a new manifest list based on source manifests. The source manifests can
+be manifest lists or single platform distribution manifests and must already
+exist in the registry where the new manifest is created. If only one source is
+specified, create performs a carbon copy.
+
+## Examples
+
+### <a name="append"></a> Append new sources to an existing manifest list (--append)
+
+Use the `--append` flag to append the new sources to an existing manifest list
+in the destination.
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### <a name="dry-run"></a> Show final image instead of pushing (--dry-run)
+
+Use the `--dry-run` flag to not push the image, just show it.
+
+### <a name="file"></a> Read source descriptor from a file (-f, --file)
+
+```
+-f FILE or --file FILE
+```
+
+Reads source from files. A source can be a manifest digest, manifest reference,
+or a JSON of OCI descriptor object.
+
+In order to define annotations or additional platform properties like `os.version` and
+`os.features` you need to add them in the OCI descriptor object encoded in JSON.
+
+```console
+$ docker buildx imagetools inspect --raw alpine | jq '.manifests[0] | .platform."os.version"="10.1"' > descr.json
+$ docker buildx imagetools create -f descr.json myuser/image
+```
+
+The descriptor in the file is merged with existing descriptor in the registry if it exists.
+
+The supported fields for the descriptor are defined in [OCI spec](https://github.com/opencontainers/image-spec/blob/master/descriptor.md#properties) .
+
+### <a name="tag"></a> Set reference for new image  (-t, --tag)
+
+```
+-t IMAGE or --tag IMAGE
+```
+
+Use the `-t` or `--tag` flag to set the name of the image to be created.
+
+```console
+$ docker buildx imagetools create --dry-run alpine@sha256:5c40b3c27b9f13c873fefb2139765c56ce97fd50230f1f2d5c91e55dec171907 sha256:c4ba6347b0e4258ce6a6de2401619316f982b7bcc529f73d2a410d0097730204
+$ docker buildx imagetools create -t tonistiigi/myapp -f image1 -f image2
+```

docs/reference/buildx_imagetools_inspect.md

@@ -0,0 +1,632 @@
+# buildx imagetools inspect
+
+```
+docker buildx imagetools inspect [OPTIONS] NAME
+```
+
+<!---MARKER_GEN_START-->
+Show details of an image in the registry
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| [`--format`](#format) | `string` | `{{.Manifest}}` | Format the output using the given Go template |
+| [`--raw`](#raw) |  |  | Show original, unformatted JSON manifest |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Show details of an image in the registry.
+
+```console
+$ docker buildx imagetools inspect alpine
+Name:      docker.io/library/alpine:latest
+MediaType: application/vnd.docker.distribution.manifest.list.v2+json
+Digest:    sha256:21a3deaa0d32a8057914f36584b5288d2e5ecc984380bc0118285c70fa8c9300
+
+Manifests:
+  Name:      docker.io/library/alpine:latest@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/amd64
+
+  Name:      docker.io/library/alpine:latest@sha256:e047bc2af17934d38c5a7fa9f46d443f1de3a7675546402592ef805cfa929f9d
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/arm/v6
+
+  Name:      docker.io/library/alpine:latest@sha256:8483ecd016885d8dba70426fda133c30466f661bb041490d525658f1aac73822
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/arm/v7
+
+  Name:      docker.io/library/alpine:latest@sha256:c74f1b1166784193ea6c8f9440263b9be6cae07dfe35e32a5df7a31358ac2060
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/arm64/v8
+
+  Name:      docker.io/library/alpine:latest@sha256:2689e157117d2da668ad4699549e55eba1ceb79cb7862368b30919f0488213f4
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/386
+
+  Name:      docker.io/library/alpine:latest@sha256:2042a492bcdd847a01cd7f119cd48caa180da696ed2aedd085001a78664407d6
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/ppc64le
+
+  Name:      docker.io/library/alpine:latest@sha256:49e322ab6690e73a4909f787bcbdb873631264ff4a108cddfd9f9c249ba1d58e
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/s390x
+```
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### <a name="format"></a> Format the output (--format)
+
+Format the output using the given Go template. Defaults to `{{.Manifest}}` if
+unset. Following fields are available:
+
+* `.Name`: provides the reference of the image
+* `.Manifest`: provides the manifest or manifest list
+* `.Image`: provides the image config
+* `.BuildInfo`: provides [build info from image config](https://github.com/moby/buildkit/blob/master/docs/build-repro.md#image-config)
+
+#### `.Name`
+
+```console
+$ docker buildx imagetools inspect alpine --format "{{.Name}}"
+Name: docker.io/library/alpine:latest
+```
+
+#### `.Manifest`
+
+```console
+$ docker buildx imagetools inspect crazymax/loop --format "{{.Manifest}}"
+Name:      docker.io/crazymax/loop:latest
+MediaType: application/vnd.docker.distribution.manifest.v2+json
+Digest:    sha256:08602e7340970e92bde5e0a2e887c1fde4d9ae753d1e05efb4c8ef3b609f97f1
+```
+
+```console
+$ docker buildx imagetools inspect moby/buildkit:master --format "{{.Manifest}}"
+Name:      docker.io/moby/buildkit:master
+MediaType: application/vnd.docker.distribution.manifest.list.v2+json
+Digest:    sha256:3183f7ce54d1efb44c34b84f428ae10aaf141e553c6b52a7ff44cc7083a05a66
+
+Manifests:
+  Name:      docker.io/moby/buildkit:master@sha256:667d28c9fb33820ce686887a717a148e89fa77f9097f9352996bbcce99d352b1
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/amd64
+
+  Name:      docker.io/moby/buildkit:master@sha256:71789527b64ab3d7b3de01d364b449cd7f7a3da758218fbf73b9c9aae05a6775
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/arm/v7
+
+  Name:      docker.io/moby/buildkit:master@sha256:fb64667e1ce6ab0d05478f3a8402af07b27737598dcf9a510fb1d792b13a66be
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/arm64
+
+  Name:      docker.io/moby/buildkit:master@sha256:1c3ddf95a0788e23f72f25800c05abc4458946685e2b66788c3d978cde6da92b
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/s390x
+
+  Name:      docker.io/moby/buildkit:master@sha256:05bcde6d460a284e5bc88026cd070277e8380355de3126cbc8fe8a452708c6b1
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/ppc64le
+
+  Name:      docker.io/moby/buildkit:master@sha256:c04c57765304ab84f4f9807fff3e11605c3a60e16435c734b02c723680f6bd6e
+  MediaType: application/vnd.docker.distribution.manifest.v2+json
+  Platform:  linux/riscv64
+```
+
+#### `.BuildInfo`
+
+```console
+$ docker buildx imagetools inspect crazymax/buildx:buildinfo --format "{{.BuildInfo}}"
+Name: docker.io/crazymax/buildx:buildinfo
+Frontend: dockerfile.v0
+Attrs:
+  filename:      Dockerfile
+  source:        docker/dockerfile-upstream:master-labs
+  build-arg:bar: foo
+  build-arg:foo: bar
+Sources:
+  Type: docker-image
+  Ref:  docker.io/docker/buildx-bin:0.6.1@sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0
+  Pin:  sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0
+
+  Type: docker-image
+  Ref:  docker.io/library/alpine:3.13
+  Pin:  sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c
+
+  Type: docker-image
+  Ref:  docker.io/moby/buildkit:v0.9.0
+  Pin:  sha256:8dc668e7f66db1c044aadbed306020743516a94848793e0f81f94a087ee78cab
+
+  Type: docker-image
+  Ref:  docker.io/tonistiigi/xx@sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04
+  Pin:  sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04
+
+  Type: http
+  Ref:  https://raw.githubusercontent.com/moby/moby/master/README.md
+  Pin:  sha256:419455202b0ef97e480d7f8199b26a721a417818bc0e2d106975f74323f25e6c
+```
+
+#### JSON output
+
+A `json` go template func is also available if you want to render fields as
+JSON bytes:
+
+```console
+$ docker buildx imagetools inspect crazymax/loop --format "{{json .Manifest}}"
+```
+```json
+{
+  "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+  "digest": "sha256:08602e7340970e92bde5e0a2e887c1fde4d9ae753d1e05efb4c8ef3b609f97f1",
+  "size": 949
+}
+```
+
+```console
+$ docker buildx imagetools inspect moby/buildkit:master --format "{{json .Manifest}}"
+```
+```json
+{
+  "schemaVersion": 2,
+  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
+  "digest": "sha256:79d97f205e2799d99a3a8ae2a1ef17acb331e11784262c3faada847dc6972c52",
+  "size": 2010,
+  "manifests": [
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:bd1e78f06de26610fadf4eb9d04b1a45a545799d6342701726e952cc0c11c912",
+      "size": 1158,
+      "platform": {
+        "architecture": "amd64",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:d37dcced63ec0965824fca644f0ac9efad8569434ec15b4c83adfcb3dcfc743b",
+      "size": 1158,
+      "platform": {
+        "architecture": "arm",
+        "os": "linux",
+        "variant": "v7"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:ce142eb2255e6af46f2809e159fd03081697c7605a3de03b9cbe9a52ddb244bf",
+      "size": 1158,
+      "platform": {
+        "architecture": "arm64",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:f59bfb5062fff76ce464bfa4e25ebaaaac887d6818238e119d68613c456d360c",
+      "size": 1158,
+      "platform": {
+        "architecture": "s390x",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:cc96426e0c50a78105d5637d31356db5dd6ec594f21b24276e534a32da09645c",
+      "size": 1159,
+      "platform": {
+        "architecture": "ppc64le",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:39f9c1e2878e6c333acb23187d6b205ce82ed934c60da326cb2c698192631478",
+      "size": 1158,
+      "platform": {
+        "architecture": "riscv64",
+        "os": "linux"
+      }
+    }
+  ]
+}
+```
+
+```console
+$ docker buildx imagetools inspect crazymax/buildx:buildinfo --format "{{json .BuildInfo}}"
+```
+```json
+{
+  "frontend": "dockerfile.v0",
+  "attrs": {
+    "build-arg:bar": "foo",
+    "build-arg:foo": "bar",
+    "filename": "Dockerfile",
+    "source": "crazymax/dockerfile:buildattrs"
+  },
+  "sources": [
+    {
+      "type": "docker-image",
+      "ref": "docker.io/docker/buildx-bin:0.6.1@sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0",
+      "pin": "sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0"
+    },
+    {
+      "type": "docker-image",
+      "ref": "docker.io/library/alpine:3.13@sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c",
+      "pin": "sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c"
+    },
+    {
+      "type": "docker-image",
+      "ref": "docker.io/moby/buildkit:v0.9.0@sha256:8dc668e7f66db1c044aadbed306020743516a94848793e0f81f94a087ee78cab",
+      "pin": "sha256:8dc668e7f66db1c044aadbed306020743516a94848793e0f81f94a087ee78cab"
+    },
+    {
+      "type": "docker-image",
+      "ref": "docker.io/tonistiigi/xx@sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04",
+      "pin": "sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04"
+    },
+    {
+      "type": "http",
+      "ref": "https://raw.githubusercontent.com/moby/moby/master/README.md",
+      "pin": "sha256:419455202b0ef97e480d7f8199b26a721a417818bc0e2d106975f74323f25e6c"
+    }
+  ]
+}
+```
+
+```console
+$ docker buildx imagetools inspect crazymax/buildx:buildinfo --format "{{json .}}"
+```
+```json
+{
+  "name": "crazymax/buildx:buildinfo",
+  "manifest": {
+    "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+    "digest": "sha256:899d2c7acbc124d406820857bb51d9089717bbe4e22b97eb4bc5789e99f09f83",
+    "size": 2628
+  },
+  "image": {
+    "created": "2022-02-24T12:27:43.627154558Z",
+    "architecture": "amd64",
+    "os": "linux",
+    "config": {
+      "Env": [
+        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+        "DOCKER_TLS_CERTDIR=/certs",
+        "DOCKER_CLI_EXPERIMENTAL=enabled"
+      ],
+      "Entrypoint": [
+        "docker-entrypoint.sh"
+      ],
+      "Cmd": [
+        "sh"
+      ]
+    },
+    "rootfs": {
+      "type": "layers",
+      "diff_ids": [
+        "sha256:7fcb75871b2101082203959c83514ac8a9f4ecfee77a0fe9aa73bbe56afdf1b4",
+        "sha256:d3c0b963ff5684160641f936d6a4aa14efc8ff27b6edac255c07f2d03ff92e82",
+        "sha256:3f8d78f13fa9b1f35d3bc3f1351d03a027c38018c37baca73f93eecdea17f244",
+        "sha256:8e6eb1137b182ae0c3f5d40ca46341fda2eaeeeb5fa516a9a2bf96171238e2e0",
+        "sha256:fde4c869a56b54dd76d7352ddaa813fd96202bda30b9dceb2c2f2ad22fa2e6ce",
+        "sha256:52025823edb284321af7846419899234b3c66219bf06061692b709875ed0760f",
+        "sha256:50adb5982dbf6126c7cf279ac3181d1e39fc9116b610b947a3dadae6f7e7c5bc",
+        "sha256:9801c319e1c66c5d295e78b2d3e80547e73c7e3c63a4b71e97c8ca357224af24",
+        "sha256:dfbfac44d5d228c49b42194c8a2f470abd6916d072f612a6fb14318e94fde8ae",
+        "sha256:3dfb74e19dedf61568b917c19b0fd3ee4580870027ca0b6054baf239855d1322",
+        "sha256:b182e707c23e4f19be73f9022a99d2d1ca7bf1ca8f280d40e4d1c10a6f51550e"
+      ]
+    },
+    "history": [
+      {
+        "created": "2021-11-12T17:19:58.698676655Z",
+        "created_by": "/bin/sh -c #(nop) ADD file:5a707b9d6cb5fff532e4c2141bc35707593f21da5528c9e71ae2ddb6ba4a4eb6 in / "
+      },
+      {
+        "created": "2021-11-12T17:19:58.948920855Z",
+        "created_by": "/bin/sh -c #(nop)  CMD [\"/bin/sh\"]",
+        "empty_layer": true
+      },
+      {
+        "created": "2022-02-24T12:27:38.285594601Z",
+        "created_by": "RUN /bin/sh -c apk --update --no-cache add     bash     ca-certificates     openssh-client   \u0026\u0026 rm -rf /tmp/* /var/cache/apk/* # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:41.061874167Z",
+        "created_by": "COPY /opt/docker/ /usr/local/bin/ # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:41.174098947Z",
+        "created_by": "COPY /usr/bin/buildctl /usr/local/bin/buildctl # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:41.320343683Z",
+        "created_by": "COPY /usr/bin/buildkit* /usr/local/bin/ # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:41.447149933Z",
+        "created_by": "COPY /buildx /usr/libexec/docker/cli-plugins/docker-buildx # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.057722191Z",
+        "created_by": "COPY /opt/docker-compose /usr/libexec/docker/cli-plugins/docker-compose # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.145224134Z",
+        "created_by": "ADD https://raw.githubusercontent.com/moby/moby/master/README.md / # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.422212427Z",
+        "created_by": "ENV DOCKER_TLS_CERTDIR=/certs",
+        "comment": "buildkit.dockerfile.v0",
+        "empty_layer": true
+      },
+      {
+        "created": "2022-02-24T12:27:43.422212427Z",
+        "created_by": "ENV DOCKER_CLI_EXPERIMENTAL=enabled",
+        "comment": "buildkit.dockerfile.v0",
+        "empty_layer": true
+      },
+      {
+        "created": "2022-02-24T12:27:43.422212427Z",
+        "created_by": "RUN /bin/sh -c docker --version   \u0026\u0026 buildkitd --version   \u0026\u0026 buildctl --version   \u0026\u0026 docker buildx version   \u0026\u0026 docker compose version   \u0026\u0026 mkdir /certs /certs/client   \u0026\u0026 chmod 1777 /certs /certs/client # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.514320155Z",
+        "created_by": "COPY rootfs/modprobe.sh /usr/local/bin/modprobe # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.627154558Z",
+        "created_by": "COPY rootfs/docker-entrypoint.sh /usr/local/bin/ # buildkit",
+        "comment": "buildkit.dockerfile.v0"
+      },
+      {
+        "created": "2022-02-24T12:27:43.627154558Z",
+        "created_by": "ENTRYPOINT [\"docker-entrypoint.sh\"]",
+        "comment": "buildkit.dockerfile.v0",
+        "empty_layer": true
+      },
+      {
+        "created": "2022-02-24T12:27:43.627154558Z",
+        "created_by": "CMD [\"sh\"]",
+        "comment": "buildkit.dockerfile.v0",
+        "empty_layer": true
+      }
+    ]
+  },
+  "buildinfo": {
+    "frontend": "dockerfile.v0",
+    "attrs": {
+      "build-arg:bar": "foo",
+      "build-arg:foo": "bar",
+      "filename": "Dockerfile",
+      "source": "docker/dockerfile-upstream:master-labs"
+    },
+    "sources": [
+      {
+        "type": "docker-image",
+        "ref": "docker.io/docker/buildx-bin:0.6.1@sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0",
+        "pin": "sha256:a652ced4a4141977c7daaed0a074dcd9844a78d7d2615465b12f433ae6dd29f0"
+      },
+      {
+        "type": "docker-image",
+        "ref": "docker.io/library/alpine:3.13",
+        "pin": "sha256:026f721af4cf2843e07bba648e158fb35ecc876d822130633cc49f707f0fc88c"
+      },
+      {
+        "type": "docker-image",
+        "ref": "docker.io/moby/buildkit:v0.9.0",
+        "pin": "sha256:8dc668e7f66db1c044aadbed306020743516a94848793e0f81f94a087ee78cab"
+      },
+      {
+        "type": "docker-image",
+        "ref": "docker.io/tonistiigi/xx@sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04",
+        "pin": "sha256:21a61be4744f6531cb5f33b0e6f40ede41fa3a1b8c82d5946178f80cc84bfc04"
+      },
+      {
+        "type": "http",
+        "ref": "https://raw.githubusercontent.com/moby/moby/master/README.md",
+        "pin": "sha256:419455202b0ef97e480d7f8199b26a721a417818bc0e2d106975f74323f25e6c"
+      }
+    ]
+  }
+}
+```
+
+#### Multi-platform
+
+Multi-platform images are supported for `.Image` and `.BuildInfo` fields. If
+you want to pick up a specific platform, you can specify it using the `index`
+go template function:
+
+```console
+$ docker buildx imagetools inspect --format '{{json (index .Image "linux/s390x")}}' moby/buildkit:master
+```
+```json
+{
+  "created": "2022-02-25T17:13:27.89891722Z",
+  "architecture": "s390x",
+  "os": "linux",
+  "config": {
+    "Env": [
+      "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+    ],
+    "Entrypoint": [
+      "buildkitd"
+    ],
+    "Volumes": {
+      "/var/lib/buildkit": {}
+    }
+  },
+  "rootfs": {
+    "type": "layers",
+    "diff_ids": [
+      "sha256:41048e32d0684349141cf05f629c5fc3c5915d1f3426b66dbb8953a540e01e1e",
+      "sha256:2651209b9208fff6c053bc3c17353cb07874e50f1a9bc96d6afd03aef63de76a",
+      "sha256:6741ed7e73039d853fa8902246a4c7e8bf9dd09652fd1b08251bc5f9e8876a7f",
+      "sha256:92ac046adeeb65c86ae3f0b458dee04ad4a462e417661c04d77642c66494f69b"
+    ]
+  },
+  "history": [
+    {
+      "created": "2021-11-24T20:41:23.709681315Z",
+      "created_by": "/bin/sh -c #(nop) ADD file:cd24c711a2ef431b3ff94f9a02bfc42f159bc60de1d0eceecafea4e8af02441d in / "
+    },
+    {
+      "created": "2021-11-24T20:41:23.94211262Z",
+      "created_by": "/bin/sh -c #(nop)  CMD [\"/bin/sh\"]",
+      "empty_layer": true
+    },
+    {
+      "created": "2022-01-26T18:15:21.449825391Z",
+      "created_by": "RUN /bin/sh -c apk add --no-cache fuse3 git openssh pigz xz   \u0026\u0026 ln -s fusermount3 /usr/bin/fusermount # buildkit",
+      "comment": "buildkit.dockerfile.v0"
+    },
+    {
+      "created": "2022-02-24T00:34:00.924540012Z",
+      "created_by": "COPY examples/buildctl-daemonless/buildctl-daemonless.sh /usr/bin/ # buildkit",
+      "comment": "buildkit.dockerfile.v0"
+    },
+    {
+      "created": "2022-02-25T17:13:27.89891722Z",
+      "created_by": "VOLUME [/var/lib/buildkit]",
+      "comment": "buildkit.dockerfile.v0",
+      "empty_layer": true
+    },
+    {
+      "created": "2022-02-25T17:13:27.89891722Z",
+      "created_by": "COPY / /usr/bin/ # buildkit",
+      "comment": "buildkit.dockerfile.v0"
+    },
+    {
+      "created": "2022-02-25T17:13:27.89891722Z",
+      "created_by": "ENTRYPOINT [\"buildkitd\"]",
+      "comment": "buildkit.dockerfile.v0",
+      "empty_layer": true
+    }
+  ]
+}
+```
+
+### <a name="raw"></a> Show original, unformatted JSON manifest (--raw)
+
+Use the `--raw` option to print the unformatted JSON manifest bytes.
+
+> `jq` is used here to get a better rendering of the output result.
+
+```console
+$ docker buildx imagetools inspect --raw crazymax/loop | jq
+```
+```json
+{
+  "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+  "schemaVersion": 2,
+  "config": {
+    "mediaType": "application/vnd.docker.container.image.v1+json",
+    "digest": "sha256:7ace7d324e79b360b2db8b820d83081863d96d22e734cdf297a8e7fd83f6ceb3",
+    "size": 2298
+  },
+  "layers": [
+    {
+      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
+      "digest": "sha256:5843afab387455b37944e709ee8c78d7520df80f8d01cf7f861aae63beeddb6b",
+      "size": 2811478
+    },
+    {
+      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
+      "digest": "sha256:726d3732a87e1c430d67e8969de6b222a889d45e045ebae1a008a37ba38f3b1f",
+      "size": 1776812
+    },
+    {
+      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
+      "digest": "sha256:5d7cf9b33148a8f220c84f27dd2cfae46aca019a3ea3fbf7274f6d6dbfae8f3b",
+      "size": 382855
+    }
+  ]
+}
+```
+
+```console
+$ docker buildx imagetools inspect --raw moby/buildkit:master | jq
+```
+```json
+{
+  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
+  "schemaVersion": 2,
+  "manifests": [
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:667d28c9fb33820ce686887a717a148e89fa77f9097f9352996bbcce99d352b1",
+      "size": 1158,
+      "platform": {
+        "architecture": "amd64",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:71789527b64ab3d7b3de01d364b449cd7f7a3da758218fbf73b9c9aae05a6775",
+      "size": 1158,
+      "platform": {
+        "architecture": "arm",
+        "os": "linux",
+        "variant": "v7"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:fb64667e1ce6ab0d05478f3a8402af07b27737598dcf9a510fb1d792b13a66be",
+      "size": 1158,
+      "platform": {
+        "architecture": "arm64",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:1c3ddf95a0788e23f72f25800c05abc4458946685e2b66788c3d978cde6da92b",
+      "size": 1158,
+      "platform": {
+        "architecture": "s390x",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:05bcde6d460a284e5bc88026cd070277e8380355de3126cbc8fe8a452708c6b1",
+      "size": 1159,
+      "platform": {
+        "architecture": "ppc64le",
+        "os": "linux"
+      }
+    },
+    {
+      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
+      "digest": "sha256:c04c57765304ab84f4f9807fff3e11605c3a60e16435c734b02c723680f6bd6e",
+      "size": 1158,
+      "platform": {
+        "architecture": "riscv64",
+        "os": "linux"
+      }
+    }
+  ]
+}
+```

docs/reference/buildx_inspect.md

@@ -0,0 +1,66 @@
+# buildx inspect
+
+```
+docker buildx inspect [NAME]
+```
+
+<!---MARKER_GEN_START-->
+Inspect current builder instance
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--bootstrap`](#bootstrap) |  |  | Ensure builder has booted before inspecting |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Shows information about the current or specified builder.
+
+## Examples
+
+### <a name="bootstrap"></a> Ensure that the builder is running before inspecting (--bootstrap)
+
+Use the `--bootstrap` option to ensure that the builder is running before
+inspecting it. If the driver is `docker-container`, then `--bootstrap` starts
+the buildkit container and waits until it is operational. Bootstrapping is
+automatically done during build, and therefore not necessary. The same BuildKit
+container is used during the lifetime of the associated builder node (as
+displayed in `buildx ls`).
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### Get information about a builder instance
+
+By default, `inspect` shows information about the current builder. Specify the
+name of the builder to inspect to get information about that builder.
+The following example shows information about a builder instance named
+`elated_tesla`:
+
+> **Note**
+> 
+> Asterisk `*` next to node build platform(s) indicate they had been set manually during `buildx create`. Otherwise, it had been autodetected.
+
+```console
+$ docker buildx inspect elated_tesla
+
+Name:   elated_tesla
+Driver: docker-container
+
+Nodes:
+Name:      elated_tesla0
+Endpoint:  unix:///var/run/docker.sock
+Status:    running
+Platforms: linux/amd64
+
+Name:      elated_tesla1
+Endpoint:  ssh://ubuntu@1.2.3.4
+Status:    running
+Platforms: linux/arm64*, linux/arm/v7, linux/arm/v6
+```

docs/reference/buildx_install.md

@@ -0,0 +1,11 @@
+# buildx install
+
+```
+docker buildx install
+```
+
+<!---MARKER_GEN_START-->
+Install buildx as a 'docker builder' alias
+
+
+<!---MARKER_GEN_END-->

docs/reference/buildx_ls.md

@@ -0,0 +1,29 @@
+# buildx ls
+
+```
+docker buildx ls
+```
+
+<!---MARKER_GEN_START-->
+List builder instances
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Lists all builder instances and the nodes for each instance
+
+```console
+$ docker buildx ls
+NAME/NODE       DRIVER/ENDPOINT             STATUS  BUILDKIT PLATFORMS
+elated_tesla *  docker-container
+  elated_tesla0 unix:///var/run/docker.sock running v0.10.3  linux/amd64
+  elated_tesla1 ssh://ubuntu@1.2.3.4        running v0.10.3  linux/arm64*, linux/arm/v7, linux/arm/v6
+default         docker
+  default       default                     running 20.10.14 linux/amd64
+```
+
+Each builder has one or more nodes associated with it. The current builder's
+name is marked with a `*` in `NAME/NODE` and explicit node to build against for
+the target platform marked with a `*` in the `PLATFORMS` column.

docs/reference/buildx_prune.md

@@ -0,0 +1,48 @@
+# buildx prune
+
+```
+docker buildx prune
+```
+
+<!---MARKER_GEN_START-->
+Remove build cache
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| `-a`, `--all` |  |  | Include internal/frontend images |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| `--filter` | `filter` |  | Provide filter values (e.g., `until=24h`) |
+| `-f`, `--force` |  |  | Do not prompt for confirmation |
+| `--keep-storage` | `bytes` | `0` | Amount of disk space to keep for cache |
+| `--verbose` |  |  | Provide a more verbose output |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Clears the build cache of the selected builder.
+
+You can finely control what cache data is kept using:
+
+- The `--filter=until=<duration>` flag to keep images that have been used in
+  the last `<duration>` time.
+
+  `<duration>` is a duration string, e.g. `24h` or `2h30m`, with allowable
+  units of `(h)ours`, `(m)inutes` and `(s)econds`.
+
+- The `--keep-storage=<size>` flag to keep `<size>` bytes of data in the cache.
+
+  `<size>` is a human-readable memory string, e.g. `128mb`, `2gb`, etc. Units
+  are case-insensitive.
+
+- The `--all` flag to allow clearing internal helper images and frontend images
+  set using the `#syntax=` directive or the `BUILDKIT_SYNTAX` build argument.
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).

docs/reference/buildx_rm.md

@@ -0,0 +1,59 @@
+# buildx rm
+
+```
+docker buildx rm [NAME]
+```
+
+<!---MARKER_GEN_START-->
+Remove a builder instance
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--all-inactive`](#all-inactive) |  |  | Remove all inactive builders |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| [`-f`](#force), [`--force`](#force) |  |  | Do not prompt for confirmation |
+| [`--keep-daemon`](#keep-daemon) |  |  | Keep the buildkitd daemon running |
+| [`--keep-state`](#keep-state) |  |  | Keep BuildKit state |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Removes the specified or current builder. It is a no-op attempting to remove the
+default builder.
+
+## Examples
+
+### <a name="all-inactive"></a> Remove all inactive builders (--all-inactive)
+
+Remove builders that are not in running state.
+
+```console
+$ docker buildx rm --all-inactive
+WARNING! This will remove all builders that are not in running state. Are you sure you want to continue? [y/N] y
+```
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).
+
+### <a name="force"></a> Do not prompt for confirmation (--force)
+
+Do not prompt for confirmation before removing inactive builders.
+
+```console
+$ docker buildx rm --all-inactive --force
+```
+
+### <a name="keep-daemon"></a> Keep the buildkitd daemon running (--keep-daemon)
+
+Keep the buildkitd daemon running after the buildx context is removed. This is useful when you manage buildkitd daemons and buildx contexts independently.
+Currently, only supported by the [`docker-container` and `kubernetes` drivers](buildx_create.md#driver).
+
+### <a name="keep-state"></a> Keep BuildKit state (--keep-state)
+
+Keep BuildKit state, so it can be reused by a new builder with the same name.
+Currently, only supported by the [`docker-container` driver](buildx_create.md#driver).

docs/reference/buildx_stop.md

@@ -0,0 +1,28 @@
+# buildx stop
+
+```
+docker buildx stop [NAME]
+```
+
+<!---MARKER_GEN_START-->
+Stop builder instance
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Stops the specified or current builder. This will not prevent buildx build to
+restart the builder. The implementation of stop depends on the driver.
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).

docs/reference/buildx_uninstall.md

@@ -0,0 +1,11 @@
+# buildx uninstall
+
+```
+docker buildx uninstall
+```
+
+<!---MARKER_GEN_START-->
+Uninstall the 'docker builder' alias
+
+
+<!---MARKER_GEN_END-->

docs/reference/buildx_use.md

@@ -0,0 +1,31 @@
+# buildx use
+
+```
+docker buildx use [OPTIONS] NAME
+```
+
+<!---MARKER_GEN_START-->
+Set the current builder instance
+
+### Options
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| [`--builder`](#builder) | `string` |  | Override the configured builder instance |
+| `--default` |  |  | Set builder as default for current context |
+| `--global` |  |  | Builder persists context changes |
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+Switches the current builder instance. Build commands invoked after this command
+will run on a specified builder. Alternatively, a context name can be used to
+switch to the default builder of that context.
+
+## Examples
+
+### <a name="builder"></a> Override the configured builder instance (--builder)
+
+Same as [`buildx --builder`](buildx.md#builder).

docs/reference/buildx_version.md

@@ -0,0 +1,20 @@
+# buildx version
+
+```
+docker buildx version
+```
+
+<!---MARKER_GEN_START-->
+Show buildx version information
+
+
+<!---MARKER_GEN_END-->
+
+## Description
+
+View version information
+
+```console
+$ docker buildx version
+github.com/docker/buildx v0.5.1-docker 11057da37336192bfc57d81e02359ba7ba848e4a
+```

driver/bkimage/bkimage.go

@@ -2,5 +2,6 @@ package bkimage
 
 const (
 	DefaultImage         = "moby/buildkit:buildx-stable-1" // TODO: make this verified
-	DefaultRootlessImage = "moby/buildkit:v0.6.2-rootless"
+	QemuImage            = "tonistiigi/binfmt:latest"      // TODO: make this verified
+	DefaultRootlessImage = DefaultImage + "-rootless"
 )

driver/docker-container/driver.go

@@ -1,34 +1,55 @@
 package docker
 
 import (
-	"archive/tar"
 	"bytes"
 	"context"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
+	"path"
+	"path/filepath"
+	"strings"
 	"time"
 
 	"github.com/docker/buildx/driver"
 	"github.com/docker/buildx/driver/bkimage"
+	"github.com/docker/buildx/util/confutil"
+	"github.com/docker/buildx/util/imagetools"
 	"github.com/docker/buildx/util/progress"
 	"github.com/docker/docker/api/types"
 	dockertypes "github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/api/types/network"
 	dockerclient "github.com/docker/docker/client"
+	dockerarchive "github.com/docker/docker/pkg/archive"
+	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/stdcopy"
 	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/util/tracing/detect"
 	"github.com/pkg/errors"
 )
 
+const (
+	volumeStateSuffix = "_state"
+)
+
 type Driver struct {
 	driver.InitConfig
-	factory driver.Factory
-	netMode string
-	image   string
-	env     []string
+	factory      driver.Factory
+	userNSRemap  bool // true if dockerd is running with userns-remap mode
+	netMode      string
+	image        string
+	cgroupParent string
+	env          []string
+}
+
+func (d *Driver) IsMobyDriver() bool {
+	return false
+}
+
+func (d *Driver) Config() driver.InitConfig {
+	return d.InitConfig
 }
 
 func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {
@@ -44,7 +65,7 @@ func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {
 			if err := d.start(ctx, sub); err != nil {
 				return err
 			}
-			if err := d.wait(ctx); err != nil {
+			if err := d.wait(ctx, sub); err != nil {
 				return err
 			}
 			return nil
@@ -59,11 +80,17 @@ func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
 	}
 
 	if err := l.Wrap("pulling image "+imageName, func() error {
-		rc, err := d.DockerAPI.ImageCreate(ctx, imageName, types.ImageCreateOptions{})
+		ra, err := imagetools.RegistryAuthForRef(imageName, d.Auth)
 		if err != nil {
 			return err
 		}
-		_, err = io.Copy(ioutil.Discard, rc)
+		rc, err := d.DockerAPI.ImageCreate(ctx, imageName, types.ImageCreateOptions{
+			RegistryAuth: ra,
+		})
+		if err != nil {
+			return err
+		}
+		_, err = io.Copy(io.Discard, rc)
 		return err
 	}); err != nil {
 		// image pulling failed, check if it exists in local image store.
@@ -86,27 +113,39 @@ func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
 	if err := l.Wrap("creating container "+d.Name, func() error {
 		hc := &container.HostConfig{
 			Privileged: true,
+			Mounts: []mount.Mount{
+				{
+					Type:   mount.TypeVolume,
+					Source: d.Name + volumeStateSuffix,
+					Target: confutil.DefaultBuildKitStateDir,
+				},
+			},
+		}
+		if d.userNSRemap {
+			hc.UsernsMode = "host"
 		}
 		if d.netMode != "" {
 			hc.NetworkMode = container.NetworkMode(d.netMode)
 		}
-		_, err := d.DockerAPI.ContainerCreate(ctx, cfg, hc, &network.NetworkingConfig{}, d.Name)
+		if info, err := d.DockerAPI.Info(ctx); err == nil && info.CgroupDriver == "cgroupfs" {
+			// Place all buildkit containers inside this cgroup by default so limits can be attached
+			// to all build activity on the host.
+			hc.CgroupParent = "/docker/buildx"
+			if d.cgroupParent != "" {
+				hc.CgroupParent = d.cgroupParent
+			}
+		}
+		_, err := d.DockerAPI.ContainerCreate(ctx, cfg, hc, &network.NetworkingConfig{}, nil, d.Name)
 		if err != nil {
 			return err
 		}
-		if f := d.InitConfig.ConfigFile; f != "" {
-			buf, err := readFileToTar(f)
-			if err != nil {
-				return err
-			}
-			if err := d.DockerAPI.CopyToContainer(ctx, d.Name, "/", buf, dockertypes.CopyToContainerOptions{}); err != nil {
-				return err
-			}
+		if err := d.copyToContainer(ctx, d.InitConfig.Files); err != nil {
+			return err
 		}
 		if err := d.start(ctx, l); err != nil {
 			return err
 		}
-		if err := d.wait(ctx); err != nil {
+		if err := d.wait(ctx, l); err != nil {
 			return err
 		}
 		return nil
@@ -116,17 +155,28 @@ func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
 	return nil
 }
 
-func (d *Driver) wait(ctx context.Context) error {
-	try := 0
+func (d *Driver) wait(ctx context.Context, l progress.SubLogger) error {
+	try := 1
 	for {
-		if err := d.run(ctx, []string{"buildctl", "debug", "workers"}); err != nil {
-			if try > 10 {
+		bufStdout := &bytes.Buffer{}
+		bufStderr := &bytes.Buffer{}
+		if err := d.run(ctx, []string{"buildctl", "debug", "workers"}, bufStdout, bufStderr); err != nil {
+			if try > 15 {
+				if err != nil {
+					d.copyLogs(context.TODO(), l)
+					if bufStdout.Len() != 0 {
+						l.Log(1, bufStdout.Bytes())
+					}
+					if bufStderr.Len() != 0 {
+						l.Log(2, bufStderr.Bytes())
+					}
+				}
 				return err
 			}
 			select {
 			case <-ctx.Done():
 				return ctx.Err()
-			case <-time.After(time.Duration(100+try*20) * time.Millisecond):
+			case <-time.After(time.Duration(try*120) * time.Millisecond):
 				try++
 				continue
 			}
@@ -135,6 +185,39 @@ func (d *Driver) wait(ctx context.Context) error {
 	}
 }
 
+func (d *Driver) copyLogs(ctx context.Context, l progress.SubLogger) error {
+	rc, err := d.DockerAPI.ContainerLogs(ctx, d.Name, types.ContainerLogsOptions{
+		ShowStdout: true, ShowStderr: true,
+	})
+	if err != nil {
+		return err
+	}
+	stdout := &logWriter{logger: l, stream: 1}
+	stderr := &logWriter{logger: l, stream: 2}
+	if _, err := stdcopy.StdCopy(stdout, stderr, rc); err != nil {
+		return err
+	}
+	return rc.Close()
+}
+
+func (d *Driver) copyToContainer(ctx context.Context, files map[string][]byte) error {
+	srcPath, err := writeConfigFiles(files)
+	if err != nil {
+		return err
+	}
+	if srcPath != "" {
+		defer os.RemoveAll(srcPath)
+	}
+	srcArchive, err := dockerarchive.TarWithOptions(srcPath, &dockerarchive.TarOptions{
+		ChownOpts: &idtools.Identity{UID: 0, GID: 0},
+	})
+	if err != nil {
+		return err
+	}
+	defer srcArchive.Close()
+	return d.DockerAPI.CopyToContainer(ctx, d.Name, "/", srcArchive, dockertypes.CopyToContainerOptions{})
+}
+
 func (d *Driver) exec(ctx context.Context, cmd []string) (string, net.Conn, error) {
 	execConfig := types.ExecConfig{
 		Cmd:          cmd,
@@ -159,12 +242,12 @@ func (d *Driver) exec(ctx context.Context, cmd []string) (string, net.Conn, erro
 	return execID, resp.Conn, nil
 }
 
-func (d *Driver) run(ctx context.Context, cmd []string) error {
+func (d *Driver) run(ctx context.Context, cmd []string, stdout, stderr io.Writer) (err error) {
 	id, conn, err := d.exec(ctx, cmd)
 	if err != nil {
 		return err
 	}
-	if _, err := io.Copy(ioutil.Discard, conn); err != nil {
+	if _, err := stdcopy.StdCopy(stdout, stderr, conn); err != nil {
 		return err
 	}
 	conn.Close()
@@ -183,7 +266,7 @@ func (d *Driver) start(ctx context.Context, l progress.SubLogger) error {
 }
 
 func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
-	container, err := d.DockerAPI.ContainerInspect(ctx, d.Name)
+	ctn, err := d.DockerAPI.ContainerInspect(ctx, d.Name)
 	if err != nil {
 		if dockerclient.IsErrNotFound(err) {
 			return &driver.Info{
@@ -193,7 +276,7 @@ func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
 		return nil, err
 	}
 
-	if container.State.Running {
+	if ctn.State.Running {
 		return &driver.Info{
 			Status: driver.Running,
 		}, nil
@@ -204,27 +287,59 @@ func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
 	}, nil
 }
 
+func (d *Driver) Version(ctx context.Context) (string, error) {
+	bufStdout := &bytes.Buffer{}
+	bufStderr := &bytes.Buffer{}
+	if err := d.run(ctx, []string{"buildkitd", "--version"}, bufStdout, bufStderr); err != nil {
+		if bufStderr.Len() > 0 {
+			return "", errors.Wrap(err, bufStderr.String())
+		}
+		return "", err
+	}
+	version := strings.Fields(bufStdout.String())
+	if len(version) != 4 {
+		return "", errors.Errorf("unexpected version format: %s", bufStdout.String())
+	}
+	return version[2], nil
+}
+
 func (d *Driver) Stop(ctx context.Context, force bool) error {
 	info, err := d.Info(ctx)
 	if err != nil {
 		return err
 	}
 	if info.Status == driver.Running {
-		return d.DockerAPI.ContainerStop(ctx, d.Name, nil)
+		return d.DockerAPI.ContainerStop(ctx, d.Name, container.StopOptions{})
 	}
 	return nil
 }
 
-func (d *Driver) Rm(ctx context.Context, force bool) error {
+func (d *Driver) Rm(ctx context.Context, force, rmVolume, rmDaemon bool) error {
 	info, err := d.Info(ctx)
 	if err != nil {
 		return err
 	}
 	if info.Status != driver.Inactive {
-		return d.DockerAPI.ContainerRemove(ctx, d.Name, dockertypes.ContainerRemoveOptions{
-			RemoveVolumes: true,
-			Force:         true,
-		})
+		container, err := d.DockerAPI.ContainerInspect(ctx, d.Name)
+		if err != nil {
+			return err
+		}
+		if rmDaemon {
+			if err := d.DockerAPI.ContainerRemove(ctx, d.Name, dockertypes.ContainerRemoveOptions{
+				RemoveVolumes: true,
+				Force:         force,
+			}); err != nil {
+				return err
+			}
+			for _, v := range container.Mounts {
+				if v.Name != d.Name+volumeStateSuffix {
+					continue
+				}
+				if rmVolume {
+					return d.DockerAPI.VolumeRemove(ctx, d.Name+volumeStateSuffix, false)
+				}
+			}
+		}
 	}
 	return nil
 }
@@ -237,9 +352,16 @@ func (d *Driver) Client(ctx context.Context) (*client.Client, error) {
 
 	conn = demuxConn(conn)
 
-	return client.New(ctx, "", client.WithDialer(func(string, time.Duration) (net.Conn, error) {
+	exp, err := detect.Exporter()
+	if err != nil {
+		return nil, err
+	}
+
+	td, _ := exp.(client.TracerDelegate)
+
+	return client.New(ctx, "", client.WithContextDialer(func(context.Context, string) (net.Conn, error) {
 		return conn, nil
-	}))
+	}), client.WithTracerDelegate(td))
 }
 
 func (d *Driver) Factory() driver.Factory {
@@ -259,7 +381,7 @@ func (d *Driver) Features() map[driver.Feature]bool {
 func demuxConn(c net.Conn) net.Conn {
 	pr, pw := io.Pipe()
 	// TODO: rewrite parser with Reader() to avoid goroutine switch
-	go stdcopy.StdCopy(pw, os.Stdout, c)
+	go stdcopy.StdCopy(pw, os.Stderr, c)
 	return &demux{
 		Conn:   c,
 		Reader: pr,
@@ -275,25 +397,36 @@ func (d *demux) Read(dt []byte) (int, error) {
 	return d.Reader.Read(dt)
 }
 
-func readFileToTar(fn string) (*bytes.Buffer, error) {
-	buf := bytes.NewBuffer(nil)
-	tw := tar.NewWriter(buf)
-	dt, err := ioutil.ReadFile(fn)
-	if err != nil {
-		return nil, err
-	}
-	if err := tw.WriteHeader(&tar.Header{
-		Name: "/etc/buildkit/buildkitd.toml",
-		Size: int64(len(dt)),
-		Mode: 0644,
-	}); err != nil {
-		return nil, err
-	}
-	if _, err := tw.Write(dt); err != nil {
-		return nil, err
-	}
-	if err := tw.Close(); err != nil {
-		return nil, err
-	}
-	return buf, nil
+type logWriter struct {
+	logger progress.SubLogger
+	stream int
+}
+
+func (l *logWriter) Write(dt []byte) (int, error) {
+	l.logger.Log(l.stream, dt)
+	return len(dt), nil
+}
+
+func writeConfigFiles(m map[string][]byte) (_ string, err error) {
+	// Temp dir that will be copied to the container
+	tmpDir, err := os.MkdirTemp("", "buildkitd-config")
+	if err != nil {
+		return "", err
+	}
+	defer func() {
+		if err != nil {
+			os.RemoveAll(tmpDir)
+		}
+	}()
+	for f, dt := range m {
+		f = path.Join(confutil.DefaultBuildKitConfigDir, f)
+		p := filepath.Join(tmpDir, f)
+		if err := os.MkdirAll(filepath.Dir(p), 0700); err != nil {
+			return "", err
+		}
+		if err := os.WriteFile(p, dt, 0600); err != nil {
+			return "", err
+		}
+	}
+	return tmpDir, nil
 }

driver/docker-container/factory.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/docker/buildx/driver"
+	dockertypes "github.com/docker/docker/api/types"
 	dockerclient "github.com/docker/docker/client"
 	"github.com/pkg/errors"
 )
@@ -28,7 +29,7 @@ func (*factory) Usage() string {
 	return "docker-container"
 }
 
-func (*factory) Priority(ctx context.Context, api dockerclient.APIClient) int {
+func (*factory) Priority(ctx context.Context, endpoint string, api dockerclient.APIClient) int {
 	if api == nil {
 		return priorityUnsupported
 	}
@@ -40,6 +41,20 @@ func (f *factory) New(ctx context.Context, cfg driver.InitConfig) (driver.Driver
 		return nil, errors.Errorf("%s driver requires docker API access", f.Name())
 	}
 	d := &Driver{factory: f, InitConfig: cfg}
+	dockerInfo, err := cfg.DockerAPI.Info(ctx)
+	if err != nil {
+		return nil, err
+	}
+	secOpts, err := dockertypes.DecodeSecurityOptions(dockerInfo.SecurityOptions)
+	if err != nil {
+		return nil, err
+	}
+	for _, f := range secOpts {
+		if f.Name == "userns" {
+			d.userNSRemap = true
+			break
+		}
+	}
 	for k, v := range cfg.DriverOpts {
 		switch {
 		case k == "network":
@@ -49,6 +64,8 @@ func (f *factory) New(ctx context.Context, cfg driver.InitConfig) (driver.Driver
 			}
 		case k == "image":
 			d.image = v
+		case k == "cgroup-parent":
+			d.cgroupParent = v
 		case strings.HasPrefix(k, "env."):
 			envName := strings.TrimPrefix(k, "env.")
 			if envName == "" {

driver/docker/driver.go

@@ -3,7 +3,6 @@ package docker
 import (
 	"context"
 	"net"
-	"time"
 
 	"github.com/docker/buildx/driver"
 	"github.com/docker/buildx/util/progress"
@@ -30,27 +29,47 @@ func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
 	}, nil
 }
 
+func (d *Driver) Version(ctx context.Context) (string, error) {
+	v, err := d.DockerAPI.ServerVersion(ctx)
+	if err != nil {
+		return "", errors.Wrapf(driver.ErrNotConnecting, err.Error())
+	}
+	return v.Version, nil
+}
+
 func (d *Driver) Stop(ctx context.Context, force bool) error {
 	return nil
 }
 
-func (d *Driver) Rm(ctx context.Context, force bool) error {
+func (d *Driver) Rm(ctx context.Context, force, rmVolume, rmDaemon bool) error {
 	return nil
 }
 
 func (d *Driver) Client(ctx context.Context) (*client.Client, error) {
-	return client.New(ctx, "", client.WithDialer(func(string, time.Duration) (net.Conn, error) {
+	return client.New(ctx, "", client.WithContextDialer(func(context.Context, string) (net.Conn, error) {
 		return d.DockerAPI.DialHijack(ctx, "/grpc", "h2c", nil)
+	}), client.WithSessionDialer(func(ctx context.Context, proto string, meta map[string][]string) (net.Conn, error) {
+		return d.DockerAPI.DialHijack(ctx, "/session", proto, meta)
 	}))
 }
 
 func (d *Driver) Features() map[driver.Feature]bool {
+	var useContainerdSnapshotter bool
+	ctx := context.Background()
+	c, err := d.Client(ctx)
+	if err == nil {
+		workers, _ := c.ListWorkers(ctx)
+		for _, w := range workers {
+			if _, ok := w.Labels["org.mobyproject.buildkit.worker.snapshotter"]; ok {
+				useContainerdSnapshotter = true
+			}
+		}
+	}
 	return map[driver.Feature]bool{
-		driver.OCIExporter:    false,
-		driver.DockerExporter: false,
-
-		driver.CacheExport:   false,
-		driver.MultiPlatform: false,
+		driver.OCIExporter:    useContainerdSnapshotter,
+		driver.DockerExporter: useContainerdSnapshotter,
+		driver.CacheExport:    useContainerdSnapshotter,
+		driver.MultiPlatform:  useContainerdSnapshotter,
 	}
 }
 
@@ -58,4 +77,10 @@ func (d *Driver) Factory() driver.Factory {
 	return d.factory
 }
 
-func (d *Driver) IsDefaultMobyDriver() {}
+func (d *Driver) IsMobyDriver() bool {
+	return true
+}
+
+func (d *Driver) Config() driver.InitConfig {
+	return d.InitConfig
+}

driver/docker/factory.go

@@ -26,7 +26,7 @@ func (*factory) Usage() string {
 	return "docker"
 }
 
-func (*factory) Priority(ctx context.Context, api dockerclient.APIClient) int {
+func (*factory) Priority(ctx context.Context, endpoint string, api dockerclient.APIClient) int {
 	if api == nil {
 		return priorityUnsupported
 	}
@@ -44,7 +44,7 @@ func (f *factory) New(ctx context.Context, cfg driver.InitConfig) (driver.Driver
 	if cfg.DockerAPI == nil {
 		return nil, errors.Errorf("docker driver requires docker API access")
 	}
-	if cfg.ConfigFile != "" {
+	if len(cfg.Files) > 0 {
 		return nil, errors.Errorf("setting config file is not supported for docker driver, use dockerd configuration file")
 	}
 

driver/driver.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/docker/buildx/store"
 	"github.com/docker/buildx/util/progress"
+	clitypes "github.com/docker/cli/cli/config/types"
 	"github.com/moby/buildkit/client"
 	"github.com/pkg/errors"
 )
@@ -44,17 +45,24 @@ type Info struct {
 	DynamicNodes []store.Node
 }
 
+type Auth interface {
+	GetAuthConfig(registryHostname string) (clitypes.AuthConfig, error)
+}
+
 type Driver interface {
 	Factory() Factory
 	Bootstrap(context.Context, progress.Logger) error
 	Info(context.Context) (*Info, error)
+	Version(context.Context) (string, error)
 	Stop(ctx context.Context, force bool) error
-	Rm(ctx context.Context, force bool) error
+	Rm(ctx context.Context, force, rmVolume, rmDaemon bool) error
 	Client(ctx context.Context) (*client.Client, error)
 	Features() map[Feature]bool
+	IsMobyDriver() bool
+	Config() InitConfig
 }
 
-func Boot(ctx context.Context, d Driver, pw progress.Writer) (*client.Client, error) {
+func Boot(ctx, clientContext context.Context, d Driver, pw progress.Writer) (*client.Client, error) {
 	try := 0
 	for {
 		info, err := d.Info(ctx)
@@ -66,16 +74,12 @@ func Boot(ctx context.Context, d Driver, pw progress.Writer) (*client.Client, er
 			if try > 2 {
 				return nil, errors.Errorf("failed to bootstrap %T driver in attempts", d)
 			}
-			if err := d.Bootstrap(ctx, func(s *client.SolveStatus) {
-				if pw != nil {
-					pw.Status() <- s
-				}
-			}); err != nil {
+			if err := d.Bootstrap(ctx, pw.Write); err != nil {
 				return nil, err
 			}
 		}
 
-		c, err := d.Client(context.TODO())
+		c, err := d.Client(clientContext)
 		if err != nil {
 			if errors.Cause(err) == ErrNotRunning && try <= 2 {
 				continue

driver/kubernetes/context/constants.go

@@ -1,4 +1,4 @@
-package kubernetes
+package context
 
 const (
 	// KubernetesEndpoint is the kubernetes endpoint name in a stored context