hack: add binaries target

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

hack/binaries

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+. $(dirname $0)/util
+
+: ${TARGETPLATFORM=$CLI_PLATFORM}
+: ${CONTINUOUS_INTEGRATION=}
+
+set -ex
+
+progressFlag=""
+if [ "$CONTINUOUS_INTEGRATION" == "true" ]; then progressFlag="--progress=plain"; fi
+
+binariesDocker() {
+  mkdir -p bin/tmp
+  export DOCKER_BUILDKIT=1
+  iidfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
+
+  platformFlag=""
+  if [ -n "$TARGETPLATFORM" ]; then
+    platformFlag="--build-arg=TARGETPLATFORM=$TARGETPLATFORM"
+  fi
+
+  docker build $platformFlag --target=binaries --iidfile $iidfile --force-rm .
+  iid=$(cat $iidfile)
+  containerID=$(docker create $iid copy)
+  docker cp $containerID:/ bin/tmp
+  mv bin/tmp/build* bin/
+  rm -rf bin/tmp
+  docker rm $containerID
+  docker rmi -f $iid
+  rm -f $iidfile
+}
+
+binaries() {
+  platformFlag=""
+  if [ ! -z "$TARGETPLATFORM" ]; then
+    platformFlag="--frontend-opt=platform=$TARGETPLATFORM"
+  fi
+  buildctl build $progressFlag --frontend=dockerfile.v0 \
+    --local context=. --local dockerfile=. \
+    --frontend-opt target=binaries $platformFlag \
+    --output type=local,dest=./bin/
+}
+
+case $buildmode in
+"buildkit")
+  binaries
+  ;;
+"docker-buildkit")
+  binariesDocker
+  ;;
+*)
+	echo "buildctl or docker with buildkit support is required"
+  exit 1
+  ;;
+esac

hack/util

@@ -2,6 +2,7 @@
 
 : ${PREFER_BUILDCTL=}
 : ${PREFER_LEGACY=}
+: ${CLI_PLATFORM=}
 
 newerEqualThan() { # $1=minimum wanted version $2=actual-version
   [ "$1" = "$(printf "$1\n$2" | sort -V | head -n 1)" ]
@@ -19,3 +20,13 @@ else
     buildmode="docker-buildkit";
   fi
 fi
+
+if [ -z "$CLI_PLATFORM" ]; then
+	rawos=$(uname -s)
+	if [ "$rawos" = "Darwin" ]; then
+		CLI_PLATFORM="darwin/amd64"
+	elif uname -s | grep MINGW 2>&1 >/dev/null ; then
+		CLI_PLATFORM="windows/amd64"
+	fi
+fi
+