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-rw-r--r--vendor/github.com/containerd/continuity/fs/copy.go172
-rw-r--r--vendor/github.com/containerd/continuity/fs/copy_linux.go144
-rw-r--r--vendor/github.com/containerd/continuity/fs/copy_unix.go112
-rw-r--r--vendor/github.com/containerd/continuity/fs/copy_windows.go49
-rw-r--r--vendor/github.com/containerd/continuity/fs/diff.go326
-rw-r--r--vendor/github.com/containerd/continuity/fs/diff_unix.go74
-rw-r--r--vendor/github.com/containerd/continuity/fs/diff_windows.go48
-rw-r--r--vendor/github.com/containerd/continuity/fs/dtype_linux.go103
-rw-r--r--vendor/github.com/containerd/continuity/fs/du.go38
-rw-r--r--vendor/github.com/containerd/continuity/fs/du_unix.go110
-rw-r--r--vendor/github.com/containerd/continuity/fs/du_windows.go82
-rw-r--r--vendor/github.com/containerd/continuity/fs/hardlink.go43
-rw-r--r--vendor/github.com/containerd/continuity/fs/hardlink_unix.go34
-rw-r--r--vendor/github.com/containerd/continuity/fs/hardlink_windows.go23
-rw-r--r--vendor/github.com/containerd/continuity/fs/path.go313
-rw-r--r--vendor/github.com/containerd/continuity/fs/stat_bsd.go44
-rw-r--r--vendor/github.com/containerd/continuity/fs/stat_linux.go43
-rw-r--r--vendor/github.com/containerd/continuity/fs/time.go29
18 files changed, 1787 insertions, 0 deletions
diff --git a/vendor/github.com/containerd/continuity/fs/copy.go b/vendor/github.com/containerd/continuity/fs/copy.go
new file mode 100644
index 000000000..ad61022ad
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/copy.go
@@ -0,0 +1,172 @@
+/*
+ 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 (
+ "io/ioutil"
+ "os"
+ "path/filepath"
+ "sync"
+
+ "github.com/pkg/errors"
+)
+
+var bufferPool = &sync.Pool{
+ New: func() interface{} {
+ buffer := make([]byte, 32*1024)
+ return &buffer
+ },
+}
+
+// XAttrErrorHandlers transform a non-nil xattr error.
+// Return nil to ignore an error.
+// xattrKey can be empty for listxattr operation.
+type XAttrErrorHandler func(dst, src, xattrKey string, err error) error
+
+type copyDirOpts struct {
+ xeh XAttrErrorHandler
+}
+
+type CopyDirOpt func(*copyDirOpts) error
+
+// WithXAttrErrorHandler allows specifying XAttrErrorHandler
+// If nil XAttrErrorHandler is specified (default), CopyDir stops
+// on a non-nil xattr error.
+func WithXAttrErrorHandler(xeh XAttrErrorHandler) CopyDirOpt {
+ return func(o *copyDirOpts) error {
+ o.xeh = xeh
+ return nil
+ }
+}
+
+// WithAllowXAttrErrors allows ignoring xattr errors.
+func WithAllowXAttrErrors() CopyDirOpt {
+ xeh := func(dst, src, xattrKey string, err error) error {
+ return nil
+ }
+ return WithXAttrErrorHandler(xeh)
+}
+
+// CopyDir copies the directory from src to dst.
+// Most efficient copy of files is attempted.
+func CopyDir(dst, src string, opts ...CopyDirOpt) error {
+ var o copyDirOpts
+ for _, opt := range opts {
+ if err := opt(&o); err != nil {
+ return err
+ }
+ }
+ inodes := map[uint64]string{}
+ return copyDirectory(dst, src, inodes, &o)
+}
+
+func copyDirectory(dst, src string, inodes map[uint64]string, o *copyDirOpts) error {
+ stat, err := os.Stat(src)
+ if err != nil {
+ return errors.Wrapf(err, "failed to stat %s", src)
+ }
+ if !stat.IsDir() {
+ return errors.Errorf("source is not directory")
+ }
+
+ if st, err := os.Stat(dst); err != nil {
+ if err := os.Mkdir(dst, stat.Mode()); err != nil {
+ return errors.Wrapf(err, "failed to mkdir %s", dst)
+ }
+ } else if !st.IsDir() {
+ return errors.Errorf("cannot copy to non-directory: %s", dst)
+ } else {
+ if err := os.Chmod(dst, stat.Mode()); err != nil {
+ return errors.Wrapf(err, "failed to chmod on %s", dst)
+ }
+ }
+
+ fis, err := ioutil.ReadDir(src)
+ if err != nil {
+ return errors.Wrapf(err, "failed to read %s", src)
+ }
+
+ if err := copyFileInfo(stat, dst); err != nil {
+ return errors.Wrapf(err, "failed to copy file info for %s", dst)
+ }
+
+ for _, fi := range fis {
+ source := filepath.Join(src, fi.Name())
+ target := filepath.Join(dst, fi.Name())
+
+ switch {
+ case fi.IsDir():
+ if err := copyDirectory(target, source, inodes, o); err != nil {
+ return err
+ }
+ continue
+ case (fi.Mode() & os.ModeType) == 0:
+ link, err := getLinkSource(target, fi, inodes)
+ if err != nil {
+ return errors.Wrap(err, "failed to get hardlink")
+ }
+ if link != "" {
+ if err := os.Link(link, target); err != nil {
+ return errors.Wrap(err, "failed to create hard link")
+ }
+ } else if err := CopyFile(target, source); err != nil {
+ return errors.Wrap(err, "failed to copy files")
+ }
+ case (fi.Mode() & os.ModeSymlink) == os.ModeSymlink:
+ link, err := os.Readlink(source)
+ if err != nil {
+ return errors.Wrapf(err, "failed to read link: %s", source)
+ }
+ if err := os.Symlink(link, target); err != nil {
+ return errors.Wrapf(err, "failed to create symlink: %s", target)
+ }
+ case (fi.Mode() & os.ModeDevice) == os.ModeDevice:
+ if err := copyDevice(target, fi); err != nil {
+ return errors.Wrapf(err, "failed to create device")
+ }
+ default:
+ // TODO: Support pipes and sockets
+ return errors.Wrapf(err, "unsupported mode %s", fi.Mode())
+ }
+ if err := copyFileInfo(fi, target); err != nil {
+ return errors.Wrap(err, "failed to copy file info")
+ }
+
+ if err := copyXAttrs(target, source, o.xeh); err != nil {
+ return errors.Wrap(err, "failed to copy xattrs")
+ }
+ }
+
+ return nil
+}
+
+// CopyFile copies the source file to the target.
+// The most efficient means of copying is used for the platform.
+func CopyFile(target, source string) error {
+ src, err := os.Open(source)
+ if err != nil {
+ return errors.Wrapf(err, "failed to open source %s", source)
+ }
+ defer src.Close()
+ tgt, err := os.Create(target)
+ if err != nil {
+ return errors.Wrapf(err, "failed to open target %s", target)
+ }
+ defer tgt.Close()
+
+ return copyFileContent(tgt, src)
+}
diff --git a/vendor/github.com/containerd/continuity/fs/copy_linux.go b/vendor/github.com/containerd/continuity/fs/copy_linux.go
new file mode 100644
index 000000000..81c71522a
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/copy_linux.go
@@ -0,0 +1,144 @@
+/*
+ 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 (
+ "io"
+ "os"
+ "syscall"
+
+ "github.com/containerd/continuity/sysx"
+ "github.com/pkg/errors"
+ "golang.org/x/sys/unix"
+)
+
+func copyFileInfo(fi os.FileInfo, name string) error {
+ st := fi.Sys().(*syscall.Stat_t)
+ if err := os.Lchown(name, int(st.Uid), int(st.Gid)); err != nil {
+ if os.IsPermission(err) {
+ // Normally if uid/gid are the same this would be a no-op, but some
+ // filesystems may still return EPERM... for instance NFS does this.
+ // In such a case, this is not an error.
+ if dstStat, err2 := os.Lstat(name); err2 == nil {
+ st2 := dstStat.Sys().(*syscall.Stat_t)
+ if st.Uid == st2.Uid && st.Gid == st2.Gid {
+ err = nil
+ }
+ }
+ }
+ if err != nil {
+ return errors.Wrapf(err, "failed to chown %s", name)
+ }
+ }
+
+ if (fi.Mode() & os.ModeSymlink) != os.ModeSymlink {
+ if err := os.Chmod(name, fi.Mode()); err != nil {
+ return errors.Wrapf(err, "failed to chmod %s", name)
+ }
+ }
+
+ timespec := []unix.Timespec{unix.Timespec(StatAtime(st)), unix.Timespec(StatMtime(st))}
+ if err := unix.UtimesNanoAt(unix.AT_FDCWD, name, timespec, unix.AT_SYMLINK_NOFOLLOW); err != nil {
+ return errors.Wrapf(err, "failed to utime %s", name)
+ }
+
+ return nil
+}
+
+const maxSSizeT = int64(^uint(0) >> 1)
+
+func copyFileContent(dst, src *os.File) error {
+ st, err := src.Stat()
+ if err != nil {
+ return errors.Wrap(err, "unable to stat source")
+ }
+
+ size := st.Size()
+ first := true
+ srcFd := int(src.Fd())
+ dstFd := int(dst.Fd())
+
+ for size > 0 {
+ // Ensure that we are never trying to copy more than SSIZE_MAX at a
+ // time and at the same time avoids overflows when the file is larger
+ // than 4GB on 32-bit systems.
+ var copySize int
+ if size > maxSSizeT {
+ copySize = int(maxSSizeT)
+ } else {
+ copySize = int(size)
+ }
+ n, err := unix.CopyFileRange(srcFd, nil, dstFd, nil, copySize, 0)
+ if err != nil {
+ if (err != unix.ENOSYS && err != unix.EXDEV) || !first {
+ return errors.Wrap(err, "copy file range failed")
+ }
+
+ buf := bufferPool.Get().(*[]byte)
+ _, err = io.CopyBuffer(dst, src, *buf)
+ bufferPool.Put(buf)
+ return errors.Wrap(err, "userspace copy failed")
+ }
+
+ first = false
+ size -= int64(n)
+ }
+
+ return nil
+}
+
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
+ xattrKeys, err := sysx.LListxattr(src)
+ if err != nil {
+ e := errors.Wrapf(err, "failed to list xattrs on %s", src)
+ if xeh != nil {
+ e = xeh(dst, src, "", e)
+ }
+ return e
+ }
+ for _, xattr := range xattrKeys {
+ data, err := sysx.LGetxattr(src, xattr)
+ if err != nil {
+ e := errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+ if xeh != nil {
+ if e = xeh(dst, src, xattr, e); e == nil {
+ continue
+ }
+ }
+ return e
+ }
+ if err := sysx.LSetxattr(dst, xattr, data, 0); err != nil {
+ e := errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+ if xeh != nil {
+ if e = xeh(dst, src, xattr, e); e == nil {
+ continue
+ }
+ }
+ return e
+ }
+ }
+
+ return nil
+}
+
+func copyDevice(dst string, fi os.FileInfo) error {
+ st, ok := fi.Sys().(*syscall.Stat_t)
+ if !ok {
+ return errors.New("unsupported stat type")
+ }
+ return unix.Mknod(dst, uint32(fi.Mode()), int(st.Rdev))
+}
diff --git a/vendor/github.com/containerd/continuity/fs/copy_unix.go b/vendor/github.com/containerd/continuity/fs/copy_unix.go
new file mode 100644
index 000000000..73c01a46d
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/copy_unix.go
@@ -0,0 +1,112 @@
+// +build solaris darwin freebsd
+
+/*
+ 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 (
+ "io"
+ "os"
+ "syscall"
+
+ "github.com/containerd/continuity/sysx"
+ "github.com/pkg/errors"
+ "golang.org/x/sys/unix"
+)
+
+func copyFileInfo(fi os.FileInfo, name string) error {
+ st := fi.Sys().(*syscall.Stat_t)
+ if err := os.Lchown(name, int(st.Uid), int(st.Gid)); err != nil {
+ if os.IsPermission(err) {
+ // Normally if uid/gid are the same this would be a no-op, but some
+ // filesystems may still return EPERM... for instance NFS does this.
+ // In such a case, this is not an error.
+ if dstStat, err2 := os.Lstat(name); err2 == nil {
+ st2 := dstStat.Sys().(*syscall.Stat_t)
+ if st.Uid == st2.Uid && st.Gid == st2.Gid {
+ err = nil
+ }
+ }
+ }
+ if err != nil {
+ return errors.Wrapf(err, "failed to chown %s", name)
+ }
+ }
+
+ if (fi.Mode() & os.ModeSymlink) != os.ModeSymlink {
+ if err := os.Chmod(name, fi.Mode()); err != nil {
+ return errors.Wrapf(err, "failed to chmod %s", name)
+ }
+ }
+
+ timespec := []syscall.Timespec{StatAtime(st), StatMtime(st)}
+ if err := syscall.UtimesNano(name, timespec); err != nil {
+ return errors.Wrapf(err, "failed to utime %s", name)
+ }
+
+ return nil
+}
+
+func copyFileContent(dst, src *os.File) error {
+ buf := bufferPool.Get().(*[]byte)
+ _, err := io.CopyBuffer(dst, src, *buf)
+ bufferPool.Put(buf)
+
+ return err
+}
+
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
+ xattrKeys, err := sysx.LListxattr(src)
+ if err != nil {
+ e := errors.Wrapf(err, "failed to list xattrs on %s", src)
+ if xeh != nil {
+ e = xeh(dst, src, "", e)
+ }
+ return e
+ }
+ for _, xattr := range xattrKeys {
+ data, err := sysx.LGetxattr(src, xattr)
+ if err != nil {
+ e := errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+ if xeh != nil {
+ if e = xeh(dst, src, xattr, e); e == nil {
+ continue
+ }
+ }
+ return e
+ }
+ if err := sysx.LSetxattr(dst, xattr, data, 0); err != nil {
+ e := errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+ if xeh != nil {
+ if e = xeh(dst, src, xattr, e); e == nil {
+ continue
+ }
+ }
+ return e
+ }
+ }
+
+ return nil
+}
+
+func copyDevice(dst string, fi os.FileInfo) error {
+ st, ok := fi.Sys().(*syscall.Stat_t)
+ if !ok {
+ return errors.New("unsupported stat type")
+ }
+ return unix.Mknod(dst, uint32(fi.Mode()), int(st.Rdev))
+}
diff --git a/vendor/github.com/containerd/continuity/fs/copy_windows.go b/vendor/github.com/containerd/continuity/fs/copy_windows.go
new file mode 100644
index 000000000..27c7d7dbb
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/copy_windows.go
@@ -0,0 +1,49 @@
+/*
+ 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 (
+ "io"
+ "os"
+
+ "github.com/pkg/errors"
+)
+
+func copyFileInfo(fi os.FileInfo, name string) error {
+ if err := os.Chmod(name, fi.Mode()); err != nil {
+ return errors.Wrapf(err, "failed to chmod %s", name)
+ }
+
+ // TODO: copy windows specific metadata
+
+ return nil
+}
+
+func copyFileContent(dst, src *os.File) error {
+ buf := bufferPool.Get().(*[]byte)
+ _, err := io.CopyBuffer(dst, src, *buf)
+ bufferPool.Put(buf)
+ return err
+}
+
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
+ return nil
+}
+
+func copyDevice(dst string, fi os.FileInfo) error {
+ return errors.New("device copy not supported")
+}
diff --git a/vendor/github.com/containerd/continuity/fs/diff.go b/vendor/github.com/containerd/continuity/fs/diff.go
new file mode 100644
index 000000000..e64f9e73d
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/diff.go
@@ -0,0 +1,326 @@
+/*
+ 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 (
+ "context"
+ "os"
+ "path/filepath"
+ "strings"
+
+ "golang.org/x/sync/errgroup"
+
+ "github.com/sirupsen/logrus"
+)
+
+// ChangeKind is the type of modification that
+// a change is making.
+type ChangeKind int
+
+const (
+ // ChangeKindUnmodified represents an unmodified
+ // file
+ ChangeKindUnmodified = iota
+
+ // ChangeKindAdd represents an addition of
+ // a file
+ ChangeKindAdd
+
+ // ChangeKindModify represents a change to
+ // an existing file
+ ChangeKindModify
+
+ // ChangeKindDelete represents a delete of
+ // a file
+ ChangeKindDelete
+)
+
+func (k ChangeKind) String() string {
+ switch k {
+ case ChangeKindUnmodified:
+ return "unmodified"
+ case ChangeKindAdd:
+ return "add"
+ case ChangeKindModify:
+ return "modify"
+ case ChangeKindDelete:
+ return "delete"
+ default:
+ return ""
+ }
+}
+
+// Change represents single change between a diff and its parent.
+type Change struct {
+ Kind ChangeKind
+ Path string
+}
+
+// ChangeFunc is the type of function called for each change
+// computed during a directory changes calculation.
+type ChangeFunc func(ChangeKind, string, os.FileInfo, error) error
+
+// Changes computes changes between two directories calling the
+// given change function for each computed change. The first
+// directory is intended to the base directory and second
+// directory the changed directory.
+//
+// The change callback is called by the order of path names and
+// should be appliable in that order.
+// Due to this apply ordering, the following is true
+// - Removed directory trees only create a single change for the root
+// directory removed. Remaining changes are implied.
+// - A directory which is modified to become a file will not have
+// delete entries for sub-path items, their removal is implied
+// by the removal of the parent directory.
+//
+// Opaque directories will not be treated specially and each file
+// removed from the base directory will show up as a removal.
+//
+// File content comparisons will be done on files which have timestamps
+// which may have been truncated. If either of the files being compared
+// has a zero value nanosecond value, each byte will be compared for
+// differences. If 2 files have the same seconds value but different
+// nanosecond values where one of those values is zero, the files will
+// be considered unchanged if the content is the same. This behavior
+// 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)
+ 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)
+ return doubleWalkDiff(ctx, changeFn, a, b)
+}
+
+func addDirChanges(ctx context.Context, changeFn ChangeFunc, root string) error {
+ return filepath.Walk(root, func(path string, f os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ // Rebase path
+ path, err = filepath.Rel(root, path)
+ if err != nil {
+ return err
+ }
+
+ path = filepath.Join(string(os.PathSeparator), path)
+
+ // Skip root
+ if path == string(os.PathSeparator) {
+ return nil
+ }
+
+ return changeFn(ChangeKindAdd, path, f, nil)
+ })
+}
+
+// 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)
+}
+
+// diffDirChanges walks the diff directory and compares changes against the base.
+func diffDirChanges(ctx context.Context, changeFn ChangeFunc, base string, o *diffDirOptions) error {
+ changedDirs := make(map[string]struct{})
+ return filepath.Walk(o.diffDir, func(path string, f os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ // Rebase path
+ path, err = filepath.Rel(o.diffDir, path)
+ if err != nil {
+ return err
+ }
+
+ path = filepath.Join(string(os.PathSeparator), path)
+
+ // Skip root
+ if path == string(os.PathSeparator) {
+ 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 {
+ return err
+ }
+ }
+
+ var kind ChangeKind
+
+ deletedFile, err := o.deleteChange(o.diffDir, path, f)
+ if err != nil {
+ return err
+ }
+
+ // Find out what kind of modification happened
+ if deletedFile != "" {
+ path = 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))
+ if err != nil && !os.IsNotExist(err) {
+ return err
+ }
+ if err == nil {
+ // The file existed in the base, 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
+ if stat.IsDir() && f.IsDir() {
+ if f.Size() == stat.Size() && f.Mode() == stat.Mode() && sameFsTime(f.ModTime(), stat.ModTime()) {
+ // Both directories are the same, don't record the change
+ return nil
+ }
+ }
+ kind = ChangeKindModify
+ }
+ }
+
+ // If /foo/bar/file.txt is modified, then /foo/bar must be part of the changed files.
+ // This block is here to ensure the change is recorded even if the
+ // modify time, mode and size of the parent directory in the rw and ro layers are all equal.
+ // Check https://github.com/docker/docker/pull/13590 for details.
+ 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))
+ if err := changeFn(ChangeKindModify, parent, pi, err); err != nil {
+ return err
+ }
+ changedDirs[parent] = struct{}{}
+ }
+ }
+
+ return changeFn(kind, path, f, nil)
+ })
+}
+
+// doubleWalkDiff walks both directories to create a diff
+func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b string) (err error) {
+ g, ctx := errgroup.WithContext(ctx)
+
+ var (
+ c1 = make(chan *currentPath)
+ c2 = make(chan *currentPath)
+
+ f1, f2 *currentPath
+ rmdir string
+ )
+ g.Go(func() error {
+ defer close(c1)
+ return pathWalk(ctx, a, c1)
+ })
+ g.Go(func() error {
+ defer close(c2)
+ return pathWalk(ctx, b, c2)
+ })
+ g.Go(func() error {
+ for c1 != nil || c2 != nil {
+ if f1 == nil && c1 != nil {
+ f1, err = nextPath(ctx, c1)
+ if err != nil {
+ return err
+ }
+ if f1 == nil {
+ c1 = nil
+ }
+ }
+
+ if f2 == nil && c2 != nil {
+ f2, err = nextPath(ctx, c2)
+ if err != nil {
+ return err
+ }
+ if f2 == nil {
+ c2 = nil
+ }
+ }
+ if f1 == nil && f2 == nil {
+ continue
+ }
+
+ var f os.FileInfo
+ k, p := pathChange(f1, f2)
+ switch k {
+ case ChangeKindAdd:
+ if rmdir != "" {
+ rmdir = ""
+ }
+ f = f2.f
+ f2 = nil
+ case ChangeKindDelete:
+ // Check if this file is already removed by being
+ // under of a removed directory
+ if rmdir != "" && strings.HasPrefix(f1.path, rmdir) {
+ f1 = nil
+ continue
+ } else if f1.f.IsDir() {
+ rmdir = f1.path + string(os.PathSeparator)
+ } else if rmdir != "" {
+ rmdir = ""
+ }
+ f1 = nil
+ case ChangeKindModify:
+ same, err := sameFile(f1, f2)
+ if err != nil {
+ return err
+ }
+ if f1.f.IsDir() && !f2.f.IsDir() {
+ rmdir = f1.path + string(os.PathSeparator)
+ } else if rmdir != "" {
+ rmdir = ""
+ }
+ f = f2.f
+ f1 = nil
+ f2 = nil
+ if same {
+ if !isLinked(f) {
+ continue
+ }
+ k = ChangeKindUnmodified
+ }
+ }
+ if err := changeFn(k, p, f, nil); err != nil {
+ return err
+ }
+ }
+ return nil
+ })
+
+ return g.Wait()
+}
diff --git a/vendor/github.com/containerd/continuity/fs/diff_unix.go b/vendor/github.com/containerd/continuity/fs/diff_unix.go
new file mode 100644
index 000000000..7913af27d
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/diff_unix.go
@@ -0,0 +1,74 @@
+// +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 fs
+
+import (
+ "bytes"
+ "os"
+ "syscall"
+
+ "github.com/containerd/continuity/sysx"
+ "github.com/pkg/errors"
+)
+
+// 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
+func compareSysStat(s1, s2 interface{}) (bool, error) {
+ ls1, ok := s1.(*syscall.Stat_t)
+ if !ok {
+ return false, nil
+ }
+ ls2, ok := s2.(*syscall.Stat_t)
+ if !ok {
+ return false, nil
+ }
+
+ return ls1.Mode == ls2.Mode && ls1.Uid == ls2.Uid && ls1.Gid == ls2.Gid && ls1.Rdev == ls2.Rdev, nil
+}
+
+func compareCapabilities(p1, p2 string) (bool, error) {
+ c1, err := sysx.LGetxattr(p1, "security.capability")
+ if err != nil && err != sysx.ENODATA {
+ return false, errors.Wrapf(err, "failed to get xattr for %s", p1)
+ }
+ c2, err := sysx.LGetxattr(p2, "security.capability")
+ if err != nil && err != sysx.ENODATA {
+ return false, errors.Wrapf(err, "failed to get xattr for %s", p2)
+ }
+ return bytes.Equal(c1, c2), nil
+}
+
+func isLinked(f os.FileInfo) bool {
+ s, ok := f.Sys().(*syscall.Stat_t)
+ if !ok {
+ return false
+ }
+ return !f.IsDir() && s.Nlink > 1
+}
diff --git a/vendor/github.com/containerd/continuity/fs/diff_windows.go b/vendor/github.com/containerd/continuity/fs/diff_windows.go
new file mode 100644
index 000000000..4bfa72d3a
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/diff_windows.go
@@ -0,0 +1,48 @@
+/*
+ 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 (
+ "os"
+
+ "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 {
+ return false, nil
+ }
+ f2, ok := s2.(windows.Win32FileAttributeData)
+ if !ok {
+ return false, nil
+ }
+ return f1.FileAttributes == f2.FileAttributes, nil
+}
+
+func compareCapabilities(p1, p2 string) (bool, error) {
+ // TODO: Use windows equivalent
+ return true, nil
+}
+
+func isLinked(os.FileInfo) bool {
+ return false
+}
diff --git a/vendor/github.com/containerd/continuity/fs/dtype_linux.go b/vendor/github.com/containerd/continuity/fs/dtype_linux.go
new file mode 100644
index 000000000..10510d8de
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/dtype_linux.go
@@ -0,0 +1,103 @@
+// +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 (
+ "fmt"
+ "io/ioutil"
+ "os"
+ "syscall"
+ "unsafe"
+)
+
+func locateDummyIfEmpty(path string) (string, error) {
+ children, err := ioutil.ReadDir(path)
+ if err != nil {
+ return "", err
+ }
+ if len(children) != 0 {
+ return "", nil
+ }
+ dummyFile, err := ioutil.TempFile(path, "fsutils-dummy")
+ if err != nil {
+ return "", err
+ }
+ name := dummyFile.Name()
+ err = dummyFile.Close()
+ return name, err
+}
+
+// SupportsDType returns whether the filesystem mounted on path supports d_type
+func SupportsDType(path string) (bool, error) {
+ // locate dummy so that we have at least one dirent
+ dummy, err := locateDummyIfEmpty(path)
+ if err != nil {
+ return false, err
+ }
+ if dummy != "" {
+ defer os.Remove(dummy)
+ }
+
+ visited := 0
+ supportsDType := true
+ fn := func(ent *syscall.Dirent) bool {
+ visited++
+ if ent.Type == syscall.DT_UNKNOWN {
+ supportsDType = false
+ // stop iteration
+ return true
+ }
+ // continue iteration
+ return false
+ }
+ if err = iterateReadDir(path, fn); err != nil {
+ return false, err
+ }
+ if visited == 0 {
+ return false, fmt.Errorf("did not hit any dirent during iteration %s", path)
+ }
+ return supportsDType, nil
+}
+
+func iterateReadDir(path string, fn func(*syscall.Dirent) bool) error {
+ d, err := os.Open(path)
+ if err != nil {
+ return err
+ }
+ defer d.Close()
+ fd := int(d.Fd())
+ buf := make([]byte, 4096)
+ for {
+ nbytes, err := syscall.ReadDirent(fd, buf)
+ if err != nil {
+ return err
+ }
+ if nbytes == 0 {
+ break
+ }
+ for off := 0; off < nbytes; {
+ ent := (*syscall.Dirent)(unsafe.Pointer(&buf[off]))
+ if stop := fn(ent); stop {
+ return nil
+ }
+ off += int(ent.Reclen)
+ }
+ }
+ return nil
+}
diff --git a/vendor/github.com/containerd/continuity/fs/du.go b/vendor/github.com/containerd/continuity/fs/du.go
new file mode 100644
index 000000000..fccc985dc
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/du.go
@@ -0,0 +1,38 @@
+/*
+ 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 "context"
+
+// Usage of disk information
+type Usage struct {
+ Inodes int64
+ Size int64
+}
+
+// DiskUsage counts the number of inodes and disk usage for the resources under
+// path.
+func DiskUsage(ctx context.Context, roots ...string) (Usage, error) {
+ return diskUsage(ctx, roots...)
+}
+
+// DiffUsage counts the numbers of inodes and disk usage in the
+// diff between the 2 directories. The first path is intended
+// as the base directory and the second as the changed directory.
+func DiffUsage(ctx context.Context, a, b string) (Usage, error) {
+ return diffUsage(ctx, a, b)
+}
diff --git a/vendor/github.com/containerd/continuity/fs/du_unix.go b/vendor/github.com/containerd/continuity/fs/du_unix.go
new file mode 100644
index 000000000..e22ffbea3
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/du_unix.go
@@ -0,0 +1,110 @@
+// +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 fs
+
+import (
+ "context"
+ "os"
+ "path/filepath"
+ "syscall"
+)
+
+type inode struct {
+ // TODO(stevvooe): Can probably reduce memory usage by not tracking
+ // device, but we can leave this right for now.
+ dev, ino uint64
+}
+
+func newInode(stat *syscall.Stat_t) inode {
+ return inode{
+ // Dev is uint32 on darwin/bsd, uint64 on linux/solaris
+ dev: uint64(stat.Dev), // nolint: unconvert
+ // Ino is uint32 on bsd, uint64 on darwin/linux/solaris
+ ino: uint64(stat.Ino), // nolint: unconvert
+ }
+}
+
+func diskUsage(ctx context.Context, roots ...string) (Usage, error) {
+
+ var (
+ size int64
+ inodes = map[inode]struct{}{} // expensive!
+ )
+
+ for _, root := range roots {
+ if err := filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ select {
+ case <-ctx.Done():
+ return ctx.Err()
+ default:
+ }
+
+ inoKey := newInode(fi.Sys().(*syscall.Stat_t))
+ if _, ok := inodes[inoKey]; !ok {
+ inodes[inoKey] = struct{}{}
+ size += fi.Size()
+ }
+
+ return nil
+ }); err != nil {
+ return Usage{}, err
+ }
+ }
+
+ return Usage{
+ Inodes: int64(len(inodes)),
+ Size: size,
+ }, nil
+}
+
+func diffUsage(ctx context.Context, a, b string) (Usage, error) {
+ var (
+ size int64
+ inodes = map[inode]struct{}{} // expensive!
+ )
+
+ if err := Changes(ctx, a, b, func(kind ChangeKind, _ string, fi os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ if kind == ChangeKindAdd || kind == ChangeKindModify {
+ inoKey := newInode(fi.Sys().(*syscall.Stat_t))
+ if _, ok := inodes[inoKey]; !ok {
+ inodes[inoKey] = struct{}{}
+ size += fi.Size()
+ }
+
+ return nil
+
+ }
+ return nil
+ }); err != nil {
+ return Usage{}, err
+ }
+
+ return Usage{
+ Inodes: int64(len(inodes)),
+ Size: size,
+ }, nil
+}
diff --git a/vendor/github.com/containerd/continuity/fs/du_windows.go b/vendor/github.com/containerd/continuity/fs/du_windows.go
new file mode 100644
index 000000000..8f25ec59c
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/du_windows.go
@@ -0,0 +1,82 @@
+// +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 fs
+
+import (
+ "context"
+ "os"
+ "path/filepath"
+)
+
+func diskUsage(ctx context.Context, roots ...string) (Usage, error) {
+ var (
+ size int64
+ )
+
+ // TODO(stevvooe): Support inodes (or equivalent) for windows.
+
+ for _, root := range roots {
+ if err := filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ select {
+ case <-ctx.Done():
+ return ctx.Err()
+ default:
+ }
+
+ size += fi.Size()
+ return nil
+ }); err != nil {
+ return Usage{}, err
+ }
+ }
+
+ return Usage{
+ Size: size,
+ }, nil
+}
+
+func diffUsage(ctx context.Context, a, b string) (Usage, error) {
+ var (
+ size int64
+ )
+
+ if err := Changes(ctx, a, b, func(kind ChangeKind, _ string, fi os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ if kind == ChangeKindAdd || kind == ChangeKindModify {
+ size += fi.Size()
+
+ return nil
+
+ }
+ return nil
+ }); err != nil {
+ return Usage{}, err
+ }
+
+ return Usage{
+ Size: size,
+ }, nil
+}
diff --git a/vendor/github.com/containerd/continuity/fs/hardlink.go b/vendor/github.com/containerd/continuity/fs/hardlink.go
new file mode 100644
index 000000000..762aa45e6
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/hardlink.go
@@ -0,0 +1,43 @@
+/*
+ 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 "os"
+
+// GetLinkInfo returns an identifier representing the node a hardlink is pointing
+// to. If the file is not hard linked then 0 will be returned.
+func GetLinkInfo(fi os.FileInfo) (uint64, bool) {
+ return getLinkInfo(fi)
+}
+
+// getLinkSource returns a path for the given name and
+// file info to its link source in the provided inode
+// map. If the given file name is not in the map and
+// has other links, it is added to the inode map
+// to be a source for other link locations.
+func getLinkSource(name string, fi os.FileInfo, inodes map[uint64]string) (string, error) {
+ inode, isHardlink := getLinkInfo(fi)
+ if !isHardlink {
+ return "", nil
+ }
+
+ path, ok := inodes[inode]
+ if !ok {
+ inodes[inode] = name
+ }
+ return path, nil
+}
diff --git a/vendor/github.com/containerd/continuity/fs/hardlink_unix.go b/vendor/github.com/containerd/continuity/fs/hardlink_unix.go
new file mode 100644
index 000000000..f95f0904c
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/hardlink_unix.go
@@ -0,0 +1,34 @@
+// +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 fs
+
+import (
+ "os"
+ "syscall"
+)
+
+func getLinkInfo(fi os.FileInfo) (uint64, bool) {
+ s, ok := fi.Sys().(*syscall.Stat_t)
+ if !ok {
+ return 0, false
+ }
+
+ // Ino is uint32 on bsd, uint64 on darwin/linux/solaris
+ return uint64(s.Ino), !fi.IsDir() && s.Nlink > 1 // nolint: unconvert
+}
diff --git a/vendor/github.com/containerd/continuity/fs/hardlink_windows.go b/vendor/github.com/containerd/continuity/fs/hardlink_windows.go
new file mode 100644
index 000000000..748554714
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/hardlink_windows.go
@@ -0,0 +1,23 @@
+/*
+ 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 "os"
+
+func getLinkInfo(fi os.FileInfo) (uint64, bool) {
+ return 0, false
+}
diff --git a/vendor/github.com/containerd/continuity/fs/path.go b/vendor/github.com/containerd/continuity/fs/path.go
new file mode 100644
index 000000000..8863caa9d
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/path.go
@@ -0,0 +1,313 @@
+/*
+ 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 (
+ "bytes"
+ "context"
+ "io"
+ "os"
+ "path/filepath"
+
+ "github.com/pkg/errors"
+)
+
+var (
+ errTooManyLinks = errors.New("too many links")
+)
+
+type currentPath struct {
+ path string
+ f os.FileInfo
+ fullPath string
+}
+
+func pathChange(lower, upper *currentPath) (ChangeKind, string) {
+ if lower == nil {
+ if upper == nil {
+ panic("cannot compare nil paths")
+ }
+ return ChangeKindAdd, upper.path
+ }
+ if upper == nil {
+ return ChangeKindDelete, lower.path
+ }
+
+ switch i := directoryCompare(lower.path, upper.path); {
+ case i < 0:
+ // File in lower that is not in upper
+ return ChangeKindDelete, lower.path
+ case i > 0:
+ // File in upper that is not in lower
+ return ChangeKindAdd, upper.path
+ default:
+ return ChangeKindModify, upper.path
+ }
+}
+
+func directoryCompare(a, b string) int {
+ l := len(a)
+ if len(b) < l {
+ l = len(b)
+ }
+ for i := 0; i < l; i++ {
+ c1, c2 := a[i], b[i]
+ if c1 == filepath.Separator {
+ c1 = byte(0)
+ }
+ if c2 == filepath.Separator {
+ c2 = byte(0)
+ }
+ if c1 < c2 {
+ return -1
+ }
+ if c1 > c2 {
+ return +1
+ }
+ }
+ if len(a) < len(b) {
+ return -1
+ }
+ if len(a) > len(b) {
+ return +1
+ }
+ return 0
+}
+
+func sameFile(f1, f2 *currentPath) (bool, error) {
+ if os.SameFile(f1.f, f2.f) {
+ return true, nil
+ }
+
+ equalStat, err := compareSysStat(f1.f.Sys(), f2.f.Sys())
+ if err != nil || !equalStat {
+ return equalStat, err
+ }
+
+ if eq, err := compareCapabilities(f1.fullPath, f2.fullPath); err != nil || !eq {
+ return eq, err
+ }
+
+ // If not a directory also check size, modtime, and content
+ if !f1.f.IsDir() {
+ if f1.f.Size() != f2.f.Size() {
+ return false, nil
+ }
+ t1 := f1.f.ModTime()
+ t2 := f2.f.ModTime()
+
+ if t1.Unix() != t2.Unix() {
+ return false, nil
+ }
+
+ // If the timestamp may have been truncated in both of the
+ // files, check content of file to determine difference
+ if t1.Nanosecond() == 0 && t2.Nanosecond() == 0 {
+ var eq bool
+ if (f1.f.Mode() & os.ModeSymlink) == os.ModeSymlink {
+ eq, err = compareSymlinkTarget(f1.fullPath, f2.fullPath)
+ } else if f1.f.Size() > 0 {
+ eq, err = compareFileContent(f1.fullPath, f2.fullPath)
+ }
+ if err != nil || !eq {
+ return eq, err
+ }
+ } else if t1.Nanosecond() != t2.Nanosecond() {
+ return false, nil
+ }
+ }
+
+ return true, nil
+}
+
+func compareSymlinkTarget(p1, p2 string) (bool, error) {
+ t1, err := os.Readlink(p1)
+ if err != nil {
+ return false, err
+ }
+ t2, err := os.Readlink(p2)
+ if err != nil {
+ return false, err
+ }
+ return t1 == t2, nil
+}
+
+const compareChuckSize = 32 * 1024
+
+// compareFileContent compares the content of 2 same sized files
+// by comparing each byte.
+func compareFileContent(p1, p2 string) (bool, error) {
+ f1, err := os.Open(p1)
+ if err != nil {
+ return false, err
+ }
+ defer f1.Close()
+ f2, err := os.Open(p2)
+ if err != nil {
+ return false, err
+ }
+ defer f2.Close()
+
+ b1 := make([]byte, compareChuckSize)
+ b2 := make([]byte, compareChuckSize)
+ for {
+ n1, err1 := f1.Read(b1)
+ if err1 != nil && err1 != io.EOF {
+ return false, err1
+ }
+ n2, err2 := f2.Read(b2)
+ if err2 != nil && err2 != io.EOF {
+ return false, err2
+ }
+ if n1 != n2 || !bytes.Equal(b1[:n1], b2[:n2]) {
+ return false, nil
+ }
+ if err1 == io.EOF && err2 == io.EOF {
+ return true, nil
+ }
+ }
+}
+
+func pathWalk(ctx context.Context, root string, pathC chan<- *currentPath) error {
+ return filepath.Walk(root, func(path string, f os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+
+ // Rebase path
+ path, err = filepath.Rel(root, path)
+ if err != nil {
+ return err
+ }
+
+ path = filepath.Join(string(os.PathSeparator), path)
+
+ // Skip root
+ if path == string(os.PathSeparator) {
+ return nil
+ }
+
+ p := &currentPath{
+ path: path,
+ f: f,
+ fullPath: filepath.Join(root, path),
+ }
+
+ select {
+ case <-ctx.Done():
+ return ctx.Err()
+ case pathC <- p:
+ return nil
+ }
+ })
+}
+
+func nextPath(ctx context.Context, pathC <-chan *currentPath) (*currentPath, error) {
+ select {
+ case <-ctx.Done():
+ return nil, ctx.Err()
+ case p := <-pathC:
+ return p, nil
+ }
+}
+
+// RootPath joins a path with a root, evaluating and bounding any
+// symlink to the root directory.
+func RootPath(root, path string) (string, error) {
+ if path == "" {
+ return root, nil
+ }
+ var linksWalked int // to protect against cycles
+ for {
+ i := linksWalked
+ newpath, err := walkLinks(root, path, &linksWalked)
+ if err != nil {
+ return "", err
+ }
+ path = newpath
+ if i == linksWalked {
+ newpath = filepath.Join("/", newpath)
+ if path == newpath {
+ return filepath.Join(root, newpath), nil
+ }
+ path = newpath
+ }
+ }
+}
+
+func walkLink(root, path string, linksWalked *int) (newpath string, islink bool, err error) {
+ if *linksWalked > 255 {
+ return "", false, errTooManyLinks
+ }
+
+ path = filepath.Join("/", path)
+ if path == "/" {
+ return path, false, nil
+ }
+ realPath := filepath.Join(root, path)
+
+ fi, err := os.Lstat(realPath)
+ if err != nil {
+ // If path does not yet exist, treat as non-symlink
+ if os.IsNotExist(err) {
+ return path, false, nil
+ }
+ return "", false, err
+ }
+ if fi.Mode()&os.ModeSymlink == 0 {
+ return path, false, nil
+ }
+ newpath, err = os.Readlink(realPath)
+ if err != nil {
+ return "", false, err
+ }
+ *linksWalked++
+ return newpath, true, nil
+}
+
+func walkLinks(root, path string, linksWalked *int) (string, error) {
+ switch dir, file := filepath.Split(path); {
+ case dir == "":
+ newpath, _, err := walkLink(root, file, linksWalked)
+ return newpath, err
+ case file == "":
+ if os.IsPathSeparator(dir[len(dir)-1]) {
+ if dir == "/" {
+ return dir, nil
+ }
+ return walkLinks(root, dir[:len(dir)-1], linksWalked)
+ }
+ newpath, _, err := walkLink(root, dir, linksWalked)
+ return newpath, err
+ default:
+ newdir, err := walkLinks(root, dir, linksWalked)
+ if err != nil {
+ return "", err
+ }
+ newpath, islink, err := walkLink(root, filepath.Join(newdir, file), linksWalked)
+ if err != nil {
+ return "", err
+ }
+ if !islink {
+ return newpath, nil
+ }
+ if filepath.IsAbs(newpath) {
+ return newpath, nil
+ }
+ return filepath.Join(newdir, newpath), nil
+ }
+}
diff --git a/vendor/github.com/containerd/continuity/fs/stat_bsd.go b/vendor/github.com/containerd/continuity/fs/stat_bsd.go
new file mode 100644
index 000000000..cb7400a33
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/stat_bsd.go
@@ -0,0 +1,44 @@
+// +build darwin freebsd
+
+/*
+ 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 (
+ "syscall"
+ "time"
+)
+
+// StatAtime returns the access time from a stat struct
+func StatAtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Atimespec
+}
+
+// StatCtime returns the created time from a stat struct
+func StatCtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Ctimespec
+}
+
+// StatMtime returns the modified time from a stat struct
+func StatMtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Mtimespec
+}
+
+// StatATimeAsTime returns the access time as a time.Time
+func StatATimeAsTime(st *syscall.Stat_t) time.Time {
+ return time.Unix(int64(st.Atimespec.Sec), int64(st.Atimespec.Nsec)) // nolint: unconvert
+}
diff --git a/vendor/github.com/containerd/continuity/fs/stat_linux.go b/vendor/github.com/containerd/continuity/fs/stat_linux.go
new file mode 100644
index 000000000..4a678dd1f
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/stat_linux.go
@@ -0,0 +1,43 @@
+/*
+ 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 (
+ "syscall"
+ "time"
+)
+
+// StatAtime returns the Atim
+func StatAtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Atim
+}
+
+// StatCtime returns the Ctim
+func StatCtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Ctim
+}
+
+// StatMtime returns the Mtim
+func StatMtime(st *syscall.Stat_t) syscall.Timespec {
+ return st.Mtim
+}
+
+// StatATimeAsTime returns st.Atim as a time.Time
+func StatATimeAsTime(st *syscall.Stat_t) time.Time {
+ // The int64 conversions ensure the line compiles for 32-bit systems as well.
+ return time.Unix(int64(st.Atim.Sec), int64(st.Atim.Nsec)) // nolint: unconvert
+}
diff --git a/vendor/github.com/containerd/continuity/fs/time.go b/vendor/github.com/containerd/continuity/fs/time.go
new file mode 100644
index 000000000..cde456123
--- /dev/null
+++ b/vendor/github.com/containerd/continuity/fs/time.go
@@ -0,0 +1,29 @@
+/*
+ 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 "time"
+
+// Gnu tar and the go tar writer don't have sub-second mtime
+// precision, which is problematic when we apply changes via tar
+// files, we handle this by comparing for exact times, *or* same
+// second count and either a or b having exactly 0 nanoseconds
+func sameFsTime(a, b time.Time) bool {
+ return a == b ||
+ (a.Unix() == b.Unix() &&
+ (a.Nanosecond() == 0 || b.Nanosecond() == 0))
+}