vendor: update buildkit to v0.17.0-rc2

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

vendor/github.com/containerd/continuity/.golangci.yml

@@ -12,5 +12,11 @@ linters:
   disable:
     - errcheck
 
+issues:
+  exclude-rules:
+    - linters:
+        - revive
+      text: "unused-parameter"
+
 run:
   timeout: 3m

vendor/github.com/containerd/continuity/Makefile

@@ -57,7 +57,7 @@ test:
 
 root-test:
 	@echo "+ $@"
-	@go test -exec sudo ${TEST_REQUIRES_ROOT_PACKAGES} -test.root
+	@go test -exec sudo ${TEST_REQUIRES_ROOT_PACKAGES} -test.root -test.v
 
 test-compile:
 	@echo "+ $@"

vendor/github.com/containerd/continuity/devices/devices_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/devices/mknod_freebsd.go

@@ -1,5 +1,4 @@
 //go:build freebsd || dragonfly
-// +build freebsd dragonfly
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/devices/mknod_unix.go

@@ -1,5 +1,4 @@
 //go:build !(freebsd || windows)
-// +build !freebsd,!windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/driver/driver_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/driver/driver_windows.go

@@ -1,5 +1,4 @@
 //go:build go1.13
-// +build go1.13
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/driver/lchmod_unix.go

@@ -1,5 +1,4 @@
 //go:build darwin || freebsd || netbsd || openbsd || dragonfly || solaris
-// +build darwin freebsd netbsd openbsd dragonfly solaris
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/copy.go

@@ -22,7 +22,7 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/sirupsen/logrus"
+	"github.com/containerd/log"
 )
 
 // XAttrErrorHandler transform a non-nil xattr error.
@@ -161,7 +161,7 @@ func copyDirectory(dst, src string, inodes map[uint64]string, o *copyDirOpts) er
 				return fmt.Errorf("failed to create irregular file: %w", err)
 			}
 		default:
-			logrus.Warnf("unsupported mode: %s: %s", source, fileInfo.Mode())
+			log.L.Warnf("unsupported mode: %s: %s", source, fileInfo.Mode())
 			return nil
 		}
 

vendor/github.com/containerd/continuity/fs/copy_irregular_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows && !freebsd
-// +build !windows,!freebsd
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/copy_linux.go

@@ -17,6 +17,7 @@
 package fs
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"syscall"
@@ -64,6 +65,9 @@ func copyFileInfo(fi os.FileInfo, src, name string) error {
 func copyXAttrs(dst, src string, excludes map[string]struct{}, errorHandler XAttrErrorHandler) error {
 	xattrKeys, err := sysx.LListxattr(src)
 	if err != nil {
+		if errors.Is(err, unix.ENOTSUP) {
+			return nil
+		}
 		e := fmt.Errorf("failed to list xattrs on %s: %w", src, err)
 		if errorHandler != nil {
 			e = errorHandler(dst, src, "", e)

vendor/github.com/containerd/continuity/fs/copy_nondarwin.go

@@ -1,5 +1,4 @@
 //go:build !darwin
-// +build !darwin
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/copy_unix.go

@@ -1,5 +1,4 @@
 //go:build darwin || freebsd || openbsd || netbsd || dragonfly || solaris
-// +build darwin freebsd openbsd netbsd dragonfly solaris
 
 /*
    Copyright The containerd Authors.
@@ -20,12 +19,14 @@
 package fs
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"runtime"
 	"syscall"
 
 	"github.com/containerd/continuity/sysx"
+	"golang.org/x/sys/unix"
 )
 
 func copyFileInfo(fi os.FileInfo, src, name string) error {
@@ -67,6 +68,9 @@ func copyXAttrs(dst, src string, excludes map[string]struct{}, errorHandler XAtt
 			// On darwin, character devices do not permit listing xattrs
 			return nil
 		}
+		if errors.Is(err, unix.ENOTSUP) {
+			return nil
+		}
 		e := fmt.Errorf("failed to list xattrs on %s: %w", src, err)
 		if errorHandler != nil {
 			e = errorHandler(dst, src, "", e)

vendor/github.com/containerd/continuity/fs/diff.go

@@ -18,11 +18,12 @@ package fs
 
 import (
 	"context"
+	"errors"
 	"os"
 	"path/filepath"
 	"strings"
 
-	"github.com/sirupsen/logrus"
+	"github.com/containerd/log"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -100,14 +101,11 @@ type ChangeFunc func(ChangeKind, string, os.FileInfo, error) error
 // is to account for timestamp truncation during archiving.
 func Changes(ctx context.Context, a, b string, changeFn ChangeFunc) error {
 	if a == "" {
-		logrus.Debugf("Using single walk diff for %s", b)
+		log.G(ctx).Debugf("Using single walk diff for %s", b)
 		return addDirChanges(ctx, changeFn, b)
-	} else if diffOptions := detectDirDiff(b, a); diffOptions != nil {
-		logrus.Debugf("Using single walk diff for %s from %s", diffOptions.diffDir, a)
-		return diffDirChanges(ctx, changeFn, a, diffOptions)
 	}
 
-	logrus.Debugf("Using double walk diff for %s from %s", b, a)
+	log.G(ctx).Debugf("Using double walk diff for %s from %s", b, a)
 	return doubleWalkDiff(ctx, changeFn, a, b)
 }
 
@@ -134,24 +132,53 @@ func addDirChanges(ctx context.Context, changeFn ChangeFunc, root string) error
 	})
 }
 
+// DiffChangeSource is the source of diff directory.
+type DiffSource int
+
+const (
+	// DiffSourceOverlayFS indicates that a diff directory is from
+	// OverlayFS.
+	DiffSourceOverlayFS DiffSource = iota
+)
+
 // diffDirOptions is used when the diff can be directly calculated from
 // a diff directory to its base, without walking both trees.
 type diffDirOptions struct {
-	diffDir      string
-	skipChange   func(string) (bool, error)
-	deleteChange func(string, string, os.FileInfo) (string, error)
+	skipChange   func(string, os.FileInfo) (bool, error)
+	deleteChange func(string, string, os.FileInfo, ChangeFunc) (bool, error)
 }
 
-// diffDirChanges walks the diff directory and compares changes against the base.
-func diffDirChanges(ctx context.Context, changeFn ChangeFunc, base string, o *diffDirOptions) error {
+// DiffDirChanges walks the diff directory and compares changes against the base.
+//
+// NOTE: If all the children of a dir are removed, or that dir are recreated
+// after remove, we will mark non-existing `.wh..opq` file as deleted. It's
+// unlikely to create explicit whiteout files for all the children and all
+// descendants. And based on OCI spec, it's not possible to create a file or
+// dir with a name beginning with `.wh.`. So, after `.wh..opq` file has been
+// deleted, the ChangeFunc, the receiver will add whiteout prefix to create a
+// opaque whiteout `.wh..wh..opq`.
+//
+// REF: https://github.com/opencontainers/image-spec/blob/v1.0/layer.md#whiteouts
+func DiffDirChanges(ctx context.Context, baseDir, diffDir string, source DiffSource, changeFn ChangeFunc) error {
+	var o *diffDirOptions
+
+	switch source {
+	case DiffSourceOverlayFS:
+		o = &diffDirOptions{
+			deleteChange: overlayFSWhiteoutConvert,
+		}
+	default:
+		return errors.New("unknown diff change source")
+	}
+
 	changedDirs := make(map[string]struct{})
-	return filepath.Walk(o.diffDir, func(path string, f os.FileInfo, err error) error {
+	return filepath.Walk(diffDir, func(path string, f os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
 
 		// Rebase path
-		path, err = filepath.Rel(o.diffDir, path)
+		path, err = filepath.Rel(diffDir, path)
 		if err != nil {
 			return err
 		}
@@ -163,38 +190,45 @@ func diffDirChanges(ctx context.Context, changeFn ChangeFunc, base string, o *di
 			return nil
 		}
 
-		// TODO: handle opaqueness, start new double walker at this
-		// location to get deletes, and skip tree in single walker
-
 		if o.skipChange != nil {
-			if skip, err := o.skipChange(path); skip {
+			if skip, err := o.skipChange(path, f); skip {
 				return err
 			}
 		}
 
 		var kind ChangeKind
 
-		deletedFile, err := o.deleteChange(o.diffDir, path, f)
-		if err != nil {
-			return err
+		deletedFile := false
+
+		if o.deleteChange != nil {
+			deletedFile, err = o.deleteChange(diffDir, path, f, changeFn)
+			if err != nil {
+				return err
+			}
+
+			_, err = os.Stat(filepath.Join(baseDir, path))
+			if err != nil {
+				if !os.IsNotExist(err) {
+					return err
+				}
+				deletedFile = false
+			}
 		}
 
 		// Find out what kind of modification happened
-		if deletedFile != "" {
-			path = deletedFile
+		if deletedFile {
 			kind = ChangeKindDelete
-			f = nil
 		} else {
 			// Otherwise, the file was added
 			kind = ChangeKindAdd
 
-			// ...Unless it already existed in a base, in which case, it's a modification
-			stat, err := os.Stat(filepath.Join(base, path))
+			// ...Unless it already existed in a baseDir, in which case, it's a modification
+			stat, err := os.Stat(filepath.Join(baseDir, path))
 			if err != nil && !os.IsNotExist(err) {
 				return err
 			}
 			if err == nil {
-				// The file existed in the base, so that's a modification
+				// The file existed in the baseDir, so that's a modification
 
 				// However, if it's a directory, maybe it wasn't actually modified.
 				// If you modify /foo/bar/baz, then /foo will be part of the changed files only because it's the parent of bar
@@ -215,10 +249,12 @@ func diffDirChanges(ctx context.Context, changeFn ChangeFunc, base string, o *di
 		if f.IsDir() {
 			changedDirs[path] = struct{}{}
 		}
+
 		if kind == ChangeKindAdd || kind == ChangeKindDelete {
 			parent := filepath.Dir(path)
+
 			if _, ok := changedDirs[parent]; !ok && parent != "/" {
-				pi, err := os.Stat(filepath.Join(o.diffDir, parent))
+				pi, err := os.Stat(filepath.Join(diffDir, parent))
 				if err := changeFn(ChangeKindModify, parent, pi, err); err != nil {
 					return err
 				}
@@ -226,6 +262,9 @@ func diffDirChanges(ctx context.Context, changeFn ChangeFunc, base string, o *di
 			}
 		}
 
+		if kind == ChangeKindDelete {
+			f = nil
+		}
 		return changeFn(kind, path, f, nil)
 	})
 }

vendor/github.com/containerd/continuity/fs/diff_linux.go

@@ -0,0 +1,101 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fs
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"syscall"
+
+	"github.com/containerd/continuity/devices"
+	"github.com/containerd/continuity/sysx"
+
+	"golang.org/x/sys/unix"
+)
+
+const (
+	// whiteoutPrefix prefix means file is a whiteout. If this is followed
+	// by a filename this means that file has been removed from the base
+	// layer.
+	//
+	// See https://github.com/opencontainers/image-spec/blob/master/layer.md#whiteouts
+	whiteoutPrefix = ".wh."
+)
+
+// overlayFSWhiteoutConvert detects whiteouts and opaque directories.
+//
+// It returns deleted indicator if the file is a character device with 0/0
+// device number. And call changeFn with ChangeKindDelete for opaque
+// directories.
+//
+// Check: https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt
+func overlayFSWhiteoutConvert(diffDir, path string, f os.FileInfo, changeFn ChangeFunc) (deleted bool, _ error) {
+	if f.Mode()&os.ModeCharDevice != 0 {
+		if _, ok := f.Sys().(*syscall.Stat_t); !ok {
+			return false, nil
+		}
+
+		maj, min, err := devices.DeviceInfo(f)
+		if err != nil {
+			return false, err
+		}
+		return (maj == 0 && min == 0), nil
+	}
+
+	if f.IsDir() {
+		originalPath := filepath.Join(diffDir, path)
+		opaque, err := getOpaqueValue(originalPath)
+		if err != nil {
+			if errors.Is(err, unix.ENODATA) {
+				return false, nil
+			}
+			return false, err
+		}
+
+		if len(opaque) == 1 && opaque[0] == 'y' {
+			opaqueDirPath := filepath.Join(path, whiteoutPrefix+".opq")
+			return false, changeFn(ChangeKindDelete, opaqueDirPath, nil, nil)
+		}
+	}
+	return false, nil
+}
+
+// getOpaqueValue returns opaque value for a given file.
+func getOpaqueValue(filePath string) ([]byte, error) {
+	for _, xattr := range []string{
+		"trusted.overlay.opaque",
+		// TODO(fuweid):
+		//
+		// user.overlay.* is available since 5.11. We should check
+		// kernel version before read.
+		//
+		// REF: https://github.com/torvalds/linux/commit/2d2f2d7322ff43e0fe92bf8cccdc0b09449bf2e1
+		"user.overlay.opaque",
+	} {
+		opaque, err := sysx.LGetxattr(filePath, xattr)
+		if err != nil {
+			if errors.Is(err, unix.ENODATA) || errors.Is(err, unix.ENOTSUP) {
+				continue
+			}
+			return nil, fmt.Errorf("failed to retrieve %s attr: %w", xattr, err)
+		}
+		return opaque, nil
+	}
+	return nil, unix.ENODATA
+}

vendor/github.com/containerd/continuity/fs/diff_nonlinux.go

@@ -0,0 +1,28 @@
+//go:build !linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fs
+
+import (
+	"errors"
+	"os"
+)
+
+func overlayFSWhiteoutConvert(string, string, os.FileInfo, ChangeFunc) (bool, error) {
+	return false, errors.New("unsupported")
+}

vendor/github.com/containerd/continuity/fs/diff_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.
@@ -28,16 +27,6 @@ import (
 	"github.com/containerd/continuity/sysx"
 )
 
-// detectDirDiff returns diff dir options if a directory could
-// be found in the mount info for upper which is the direct
-// diff with the provided lower directory
-func detectDirDiff(upper, lower string) *diffDirOptions {
-	// TODO: get mount options for upper
-	// TODO: detect AUFS
-	// TODO: detect overlay
-	return nil
-}
-
 // compareSysStat returns whether the stats are equivalent,
 // whether the files are considered the same file, and
 // an error

vendor/github.com/containerd/continuity/fs/diff_windows.go

@@ -22,10 +22,6 @@ import (
 	"golang.org/x/sys/windows"
 )
 
-func detectDirDiff(upper, lower string) *diffDirOptions {
-	return nil
-}
-
 func compareSysStat(s1, s2 interface{}) (bool, error) {
 	f1, ok := s1.(windows.Win32FileAttributeData)
 	if !ok {

vendor/github.com/containerd/continuity/fs/dtype_linux.go

@@ -1,5 +1,4 @@
 //go:build linux
-// +build linux
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/du_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/du_windows.go

@@ -1,5 +1,4 @@
 //go:build windows
-// +build windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/fstest/compare_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/fstest/file_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.
@@ -20,9 +19,11 @@
 package fstest
 
 import (
+	"os"
 	"path/filepath"
 	"time"
 
+	"github.com/containerd/continuity/devices"
 	"github.com/containerd/continuity/sysx"
 	"golang.org/x/sys/unix"
 )
@@ -46,6 +47,14 @@ func Lchtimes(name string, atime, mtime time.Time) Applier {
 	})
 }
 
+// CreateDeviceFile provides creates devices Applier.
+func CreateDeviceFile(name string, mode os.FileMode, maj, min int) Applier {
+	return applyFn(func(root string) error {
+		fullPath := filepath.Join(root, name)
+		return devices.Mknod(fullPath, mode, maj, min)
+	})
+}
+
 func Base() Applier {
 	return applyFn(func(root string) error {
 		// do nothing, as the base is not special

vendor/github.com/containerd/continuity/fs/fstest/file_windows.go

@@ -18,9 +18,17 @@ package fstest
 
 import (
 	"errors"
+	"os"
 	"time"
 )
 
+// SetXAttr sets the xatter for the file
+func SetXAttr(name, key, value string) Applier {
+	return applyFn(func(root string) error {
+		return errors.New("Not implemented")
+	})
+}
+
 // Lchtimes changes access and mod time of file without following symlink
 func Lchtimes(name string, atime, mtime time.Time) Applier {
 	return applyFn(func(root string) error {
@@ -28,6 +36,13 @@ func Lchtimes(name string, atime, mtime time.Time) Applier {
 	})
 }
 
+// CreateDeviceFile provides creates devices Applier.
+func CreateDeviceFile(name string, mode os.FileMode, maj, min int) Applier {
+	return applyFn(func(root string) error {
+		return errors.New("Not implemented")
+	})
+}
+
 // Base applies the files required to make a valid Windows container layer
 // that the filter will mount. It is used for testing the snapshotter
 func Base() Applier {

vendor/github.com/containerd/continuity/fs/fstest/mkfs_linux.go

@@ -0,0 +1,44 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fstest
+
+import (
+	"os/exec"
+	"testing"
+
+	"github.com/containerd/continuity/testutil"
+	"github.com/containerd/continuity/testutil/loopback"
+)
+
+func WithMkfs(t *testing.T, f func(), mkfs ...string) {
+	testutil.RequiresRoot(t)
+	mnt := t.TempDir()
+	loop, err := loopback.New(100 << 20) // 100 MB
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer loop.Close()
+	if out, err := exec.Command(mkfs[0], append(mkfs[1:], loop.Device)...).CombinedOutput(); err != nil {
+		t.Fatalf("could not mkfs (%v) %s: %v (out: %q)", mkfs, loop.Device, err, string(out))
+	}
+	if out, err := exec.Command("mount", loop.Device, mnt).CombinedOutput(); err != nil {
+		t.Fatalf("could not mount %s: %v (out: %q)", loop.Device, err, string(out))
+	}
+	defer testutil.Unmount(t, mnt)
+	t.Setenv("TMPDIR", mnt)
+	f()
+}

vendor/github.com/containerd/continuity/fs/fstest/mkfs_others.go

@@ -0,0 +1,25 @@
+//go:build !linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fstest
+
+import "testing"
+
+func WithMkfs(t *testing.T, f func(), mkfs ...string) {
+	t.Fatal("WithMkfs requires Linux")
+}

vendor/github.com/containerd/continuity/fs/hardlink_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/magic_linux.go

@@ -0,0 +1,123 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+/*
+Copyright 2013-2018 Docker, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Original source: https://github.com/moby/moby/blob/v26.0.0/daemon/graphdriver/driver_linux.go
+
+package fs
+
+import (
+	"path/filepath"
+	"syscall"
+)
+
+// Magic unsigned id of the filesystem in use.
+type Magic uint32
+
+const (
+	// MagicUnsupported is a predefined constant value other than a valid filesystem id.
+	MagicUnsupported = Magic(0x00000000)
+)
+
+const (
+	// MagicAufs filesystem id for Aufs
+	MagicAufs = Magic(0x61756673)
+	// MagicBtrfs filesystem id for Btrfs
+	MagicBtrfs = Magic(0x9123683E)
+	// MagicCramfs filesystem id for Cramfs
+	MagicCramfs = Magic(0x28cd3d45)
+	// MagicEcryptfs filesystem id for eCryptfs
+	MagicEcryptfs = Magic(0xf15f)
+	// MagicExtfs filesystem id for Extfs
+	MagicExtfs = Magic(0x0000EF53)
+	// MagicF2fs filesystem id for F2fs
+	MagicF2fs = Magic(0xF2F52010)
+	// MagicGPFS filesystem id for GPFS
+	MagicGPFS = Magic(0x47504653)
+	// MagicJffs2Fs filesystem if for Jffs2Fs
+	MagicJffs2Fs = Magic(0x000072b6)
+	// MagicJfs filesystem id for Jfs
+	MagicJfs = Magic(0x3153464a)
+	// MagicNfsFs filesystem id for NfsFs
+	MagicNfsFs = Magic(0x00006969)
+	// MagicRAMFs filesystem id for RamFs
+	MagicRAMFs = Magic(0x858458f6)
+	// MagicReiserFs filesystem id for ReiserFs
+	MagicReiserFs = Magic(0x52654973)
+	// MagicSmbFs filesystem id for SmbFs
+	MagicSmbFs = Magic(0x0000517B)
+	// MagicSquashFs filesystem id for SquashFs
+	MagicSquashFs = Magic(0x73717368)
+	// MagicTmpFs filesystem id for TmpFs
+	MagicTmpFs = Magic(0x01021994)
+	// MagicVxFS filesystem id for VxFs
+	MagicVxFS = Magic(0xa501fcf5)
+	// MagicXfs filesystem id for Xfs
+	MagicXfs = Magic(0x58465342)
+	// MagicZfs filesystem id for Zfs
+	MagicZfs = Magic(0x2fc12fc1)
+	// MagicOverlay filesystem id for overlay
+	MagicOverlay = Magic(0x794C7630)
+)
+
+var (
+	// FsNames maps filesystem id to name of the filesystem.
+	FsNames = map[Magic]string{
+		MagicAufs:        "aufs",
+		MagicBtrfs:       "btrfs",
+		MagicCramfs:      "cramfs",
+		MagicExtfs:       "extfs",
+		MagicF2fs:        "f2fs",
+		MagicGPFS:        "gpfs",
+		MagicJffs2Fs:     "jffs2",
+		MagicJfs:         "jfs",
+		MagicNfsFs:       "nfs",
+		MagicOverlay:     "overlayfs",
+		MagicRAMFs:       "ramfs",
+		MagicReiserFs:    "reiserfs",
+		MagicSmbFs:       "smb",
+		MagicSquashFs:    "squashfs",
+		MagicTmpFs:       "tmpfs",
+		MagicUnsupported: "unsupported",
+		MagicVxFS:        "vxfs",
+		MagicXfs:         "xfs",
+		MagicZfs:         "zfs",
+	}
+)
+
+// GetMagic returns the filesystem id given the path.
+func GetMagic(rootpath string) (Magic, error) {
+	var buf syscall.Statfs_t
+	if err := syscall.Statfs(filepath.Dir(rootpath), &buf); err != nil {
+		return 0, err
+	}
+	return Magic(buf.Type), nil
+}

vendor/github.com/containerd/continuity/fs/stat_darwinbsd.go

@@ -1,5 +1,4 @@
 //go:build darwin || freebsd || netbsd
-// +build darwin freebsd netbsd
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/fs/stat_unix.go

@@ -1,5 +1,4 @@
 //go:build linux || openbsd || dragonfly || solaris
-// +build linux openbsd dragonfly solaris
 
 /*
    Copyright The containerd Authors.
@@ -20,10 +19,36 @@
 package fs
 
 import (
+	"fmt"
+	"io/fs"
 	"syscall"
 	"time"
 )
 
+func Atime(st fs.FileInfo) (time.Time, error) {
+	stSys, ok := st.Sys().(*syscall.Stat_t)
+	if !ok {
+		return time.Time{}, fmt.Errorf("expected st.Sys() to be *syscall.Stat_t, got %T", st.Sys())
+	}
+	return StatATimeAsTime(stSys), nil
+}
+
+func Ctime(st fs.FileInfo) (time.Time, error) {
+	stSys, ok := st.Sys().(*syscall.Stat_t)
+	if !ok {
+		return time.Time{}, fmt.Errorf("expected st.Sys() to be *syscall.Stat_t, got %T", st.Sys())
+	}
+	return time.Unix(stSys.Atim.Unix()), nil
+}
+
+func Mtime(st fs.FileInfo) (time.Time, error) {
+	stSys, ok := st.Sys().(*syscall.Stat_t)
+	if !ok {
+		return time.Time{}, fmt.Errorf("expected st.Sys() to be *syscall.Stat_t, got %T", st.Sys())
+	}
+	return time.Unix(stSys.Mtim.Unix()), nil
+}
+
 // StatAtime returns the Atim
 func StatAtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Atim

vendor/github.com/containerd/continuity/fs/stat_windows.go

@@ -0,0 +1,33 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fs
+
+import (
+	"fmt"
+	"io/fs"
+	"syscall"
+	"time"
+)
+
+func Atime(st fs.FileInfo) (time.Time, error) {
+	stSys, ok := st.Sys().(*syscall.Win32FileAttributeData)
+	if !ok {
+		return time.Time{}, fmt.Errorf("expected st.Sys() to be *syscall.Win32FileAttributeData, got %T", st.Sys())
+	}
+	// ref: https://github.com/golang/go/blob/go1.19.2/src/os/types_windows.go#L230
+	return time.Unix(0, stSys.LastAccessTime.Nanoseconds()), nil
+}

vendor/github.com/containerd/continuity/fs/utimesnanoat.go

@@ -1,5 +1,4 @@
 //go:build !(windows || linux)
-// +build !windows,!linux
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/hardlinks_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/resource_unix.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/sysx/nodata_unix.go

@@ -1,5 +1,4 @@
 //go:build !(linux || solaris || windows)
-// +build !linux,!solaris,!windows
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/sysx/xattr.go

@@ -1,5 +1,4 @@
 //go:build linux || darwin
-// +build linux darwin
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/sysx/xattr_unsupported.go

@@ -1,5 +1,4 @@
 //go:build !linux && !darwin
-// +build !linux,!darwin
 
 /*
    Copyright The containerd Authors.

vendor/github.com/containerd/continuity/testutil/helpers.go

@@ -0,0 +1,27 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package testutil
+
+import (
+	"flag"
+)
+
+var rootEnabled bool
+
+func init() {
+	flag.BoolVar(&rootEnabled, "test.root", false, "enable tests that require root")
+}

vendor/github.com/containerd/continuity/testutil/helpers_unix.go

@@ -0,0 +1,57 @@
+//go:build !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package testutil
+
+import (
+	"os"
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+// Unmount unmounts a given mountPoint and sets t.Error if it fails
+func Unmount(t *testing.T, mountPoint string) {
+	t.Log("unmount", mountPoint)
+	if err := unmountAll(mountPoint); err != nil {
+		t.Error("Could not umount", mountPoint, err)
+	}
+}
+
+// RequiresRoot skips tests that require root, unless the test.root flag has
+// been set
+func RequiresRoot(t testing.TB) {
+	if !rootEnabled {
+		t.Skip("skipping test that requires root")
+		return
+	}
+	if os.Getuid() != 0 {
+		t.Error("This test must be run as root.")
+	}
+}
+
+func unmountAll(mountpoint string) error {
+	for {
+		if err := unix.Unmount(mountpoint, unmountFlags); err != nil {
+			if err == unix.EINVAL {
+				return nil
+			}
+			return err
+		}
+	}
+}

vendor/github.com/containerd/continuity/testutil/helpers_windows.go

@@ -0,0 +1,32 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package testutil
+
+import "testing"
+
+// RequiresRoot does nothing on Windows
+func RequiresRoot(t testing.TB) {
+}
+
+// RequiresRootM is similar to RequiresRoot but intended to be called from *testing.M.
+func RequiresRootM() {
+}
+
+// Unmount unmounts a given mountPoint and sets t.Error if it fails
+// Does nothing on Windows
+func Unmount(t *testing.T, mountPoint string) {
+}

vendor/github.com/containerd/continuity/testutil/loopback/loopback_linux.go

@@ -0,0 +1,118 @@
+//go:build linux
+// +build linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package loopback
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+
+	"github.com/containerd/log"
+)
+
+// New creates a loopback device
+func New(size int64) (*Loopback, error) {
+	// create temporary file for the disk image
+	file, err := os.CreateTemp("", "containerd-test-loopback")
+	if err != nil {
+		return nil, fmt.Errorf("could not create temporary file for loopback: %w", err)
+	}
+
+	if err := file.Truncate(size); err != nil {
+		file.Close()
+		os.Remove(file.Name())
+		return nil, fmt.Errorf("failed to resize temp file: %w", err)
+	}
+	file.Close()
+
+	// create device
+	losetup := exec.Command("losetup", "--find", "--show", file.Name())
+	var stdout, stderr bytes.Buffer
+	losetup.Stdout = &stdout
+	losetup.Stderr = &stderr
+	if err := losetup.Run(); err != nil {
+		os.Remove(file.Name())
+		return nil, fmt.Errorf("loopback setup failed (%v): stdout=%q, stderr=%q: %w", losetup.Args, stdout.String(), stderr.String(), err)
+	}
+
+	deviceName := strings.TrimSpace(stdout.String())
+	log.L.Debugf("Created loop device %s (using %s)", deviceName, file.Name())
+
+	cleanup := func() error {
+		// detach device
+		log.L.Debugf("Removing loop device %s", deviceName)
+		losetup := exec.Command("losetup", "--detach", deviceName)
+		if out, err := losetup.CombinedOutput(); err != nil {
+			return fmt.Errorf("Could not remove loop device %s (%v): %q: %w", deviceName, losetup.Args, string(out), err)
+		}
+
+		// remove file
+		log.L.Debugf("Removing temporary file %s", file.Name())
+		return os.Remove(file.Name())
+	}
+
+	l := Loopback{
+		File:   file.Name(),
+		Device: deviceName,
+		close:  cleanup,
+	}
+	return &l, nil
+}
+
+// Loopback device
+type Loopback struct {
+	// File is the underlying sparse file
+	File string
+	// Device is /dev/loopX
+	Device string
+	close  func() error
+}
+
+// SoftSize returns st_size
+func (l *Loopback) SoftSize() (int64, error) {
+	st, err := os.Stat(l.File)
+	if err != nil {
+		return 0, err
+	}
+	return st.Size(), nil
+}
+
+// HardSize returns st_blocks * 512; see stat(2)
+func (l *Loopback) HardSize() (int64, error) {
+	st, err := os.Stat(l.File)
+	if err != nil {
+		return 0, err
+	}
+	st2, ok := st.Sys().(*syscall.Stat_t)
+	if !ok {
+		return 0, errors.New("st.Sys() is not a *syscall.Stat_t")
+	}
+	// NOTE: st_blocks has nothing to do with st_blksize; see stat(2)
+	return st2.Blocks * 512, nil
+}
+
+// Close detaches the device and removes the underlying file
+func (l *Loopback) Close() error {
+	return l.close()
+}

vendor/github.com/containerd/continuity/testutil/mount_linux.go

@@ -0,0 +1,21 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package testutil
+
+import "golang.org/x/sys/unix"
+
+const unmountFlags int = unix.MNT_DETACH

vendor/github.com/containerd/continuity/testutil/mount_other.go

@@ -0,0 +1,21 @@
+//go:build !linux && !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package testutil
+
+const unmountFlags int = 0