Refactor pkg/archive with a platform-independent stat struct
pkg/archive contains code both invoked from cli (cross platform) and daemon (linux only) and Unix-specific dependencies break compilation on Windows. We extracted those stat-related funcs into platform specific implementations at pkg/system and added unit tests. Signed-off-by: Ahmet Alp Balkan <ahmetb@microsoft.com>
This commit is contained in:
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515e7481de
commit
718066ad61
13 changed files with 209 additions and 65 deletions
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@ -192,20 +192,11 @@ func (ta *tarAppender) addTarFile(path, name string) error {
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hdr.Name = name
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var (
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nlink uint32
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inode uint64
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)
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if stat, ok := fi.Sys().(*syscall.Stat_t); ok {
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nlink = uint32(stat.Nlink)
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inode = uint64(stat.Ino)
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// Currently go does not fill in the major/minors
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if stat.Mode&syscall.S_IFBLK == syscall.S_IFBLK ||
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stat.Mode&syscall.S_IFCHR == syscall.S_IFCHR {
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hdr.Devmajor = int64(major(uint64(stat.Rdev)))
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hdr.Devminor = int64(minor(uint64(stat.Rdev)))
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}
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nlink, inode, err := setHeaderForSpecialDevice(hdr, ta, name, fi.Sys())
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if err != nil {
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return err
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}
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// if it's a regular file and has more than 1 link,
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// it's hardlinked, so set the type flag accordingly
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if fi.Mode().IsRegular() && nlink > 1 {
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@ -291,7 +282,7 @@ func createTarFile(path, extractDir string, hdr *tar.Header, reader io.Reader, L
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mode |= syscall.S_IFIFO
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}
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if err := syscall.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
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if err := system.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
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return err
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}
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39
archive/archive_unix.go
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39
archive/archive_unix.go
Normal file
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@ -0,0 +1,39 @@
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// +build !windows
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package archive
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import (
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"errors"
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"syscall"
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"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
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)
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func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (nlink uint32, inode uint64, err error) {
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s, ok := stat.(*syscall.Stat_t)
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if !ok {
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err = errors.New("cannot convert stat value to syscall.Stat_t")
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return
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}
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nlink = uint32(s.Nlink)
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inode = uint64(s.Ino)
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// Currently go does not fil in the major/minors
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if s.Mode&syscall.S_IFBLK == syscall.S_IFBLK ||
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s.Mode&syscall.S_IFCHR == syscall.S_IFCHR {
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hdr.Devmajor = int64(major(uint64(s.Rdev)))
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hdr.Devminor = int64(minor(uint64(s.Rdev)))
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}
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return
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}
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func major(device uint64) uint64 {
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return (device >> 8) & 0xfff
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}
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func minor(device uint64) uint64 {
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return (device & 0xff) | ((device >> 12) & 0xfff00)
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}
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12
archive/archive_windows.go
Normal file
12
archive/archive_windows.go
Normal file
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@ -0,0 +1,12 @@
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// +build windows
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package archive
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import (
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"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
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)
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func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (nlink uint32, inode uint64, err error) {
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// do nothing. no notion of Rdev, Inode, Nlink in stat on Windows
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return
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}
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@ -135,7 +135,7 @@ func Changes(layers []string, rw string) ([]Change, error) {
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type FileInfo struct {
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parent *FileInfo
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name string
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stat syscall.Stat_t
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stat *system.Stat
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children map[string]*FileInfo
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capability []byte
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added bool
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@ -168,7 +168,7 @@ func (info *FileInfo) path() string {
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}
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func (info *FileInfo) isDir() bool {
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return info.parent == nil || info.stat.Mode&syscall.S_IFDIR == syscall.S_IFDIR
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return info.parent == nil || info.stat.Mode()&syscall.S_IFDIR == syscall.S_IFDIR
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}
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func (info *FileInfo) addChanges(oldInfo *FileInfo, changes *[]Change) {
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@ -199,21 +199,21 @@ func (info *FileInfo) addChanges(oldInfo *FileInfo, changes *[]Change) {
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oldChild, _ := oldChildren[name]
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if oldChild != nil {
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// change?
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oldStat := &oldChild.stat
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newStat := &newChild.stat
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oldStat := oldChild.stat
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newStat := newChild.stat
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// Note: We can't compare inode or ctime or blocksize here, because these change
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// when copying a file into a container. However, that is not generally a problem
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// because any content change will change mtime, and any status change should
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// be visible when actually comparing the stat fields. The only time this
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// breaks down is if some code intentionally hides a change by setting
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// back mtime
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if oldStat.Mode != newStat.Mode ||
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oldStat.Uid != newStat.Uid ||
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oldStat.Gid != newStat.Gid ||
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oldStat.Rdev != newStat.Rdev ||
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if oldStat.Mode() != newStat.Mode() ||
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oldStat.Uid() != newStat.Uid() ||
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oldStat.Gid() != newStat.Gid() ||
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oldStat.Rdev() != newStat.Rdev() ||
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// Don't look at size for dirs, its not a good measure of change
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(oldStat.Size != newStat.Size && oldStat.Mode&syscall.S_IFDIR != syscall.S_IFDIR) ||
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!sameFsTimeSpec(system.GetLastModification(oldStat), system.GetLastModification(newStat)) ||
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(oldStat.Size() != newStat.Size() && oldStat.Mode()&syscall.S_IFDIR != syscall.S_IFDIR) ||
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!sameFsTimeSpec(oldStat.Mtim(), newStat.Mtim()) ||
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bytes.Compare(oldChild.capability, newChild.capability) != 0 {
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change := Change{
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Path: newChild.path(),
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@ -269,14 +269,6 @@ func newRootFileInfo() *FileInfo {
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return root
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}
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func lstat(path string) (*stat, error) {
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s, err := system.Lstat(path)
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if err != nil {
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return nil, err
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}
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return fromStatT(s), nil
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}
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func collectFileInfo(sourceDir string) (*FileInfo, error) {
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root := newRootFileInfo()
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@ -307,7 +299,7 @@ func collectFileInfo(sourceDir string) (*FileInfo, error) {
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parent: parent,
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}
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s, err := lstat(path)
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s, err := system.Lstat(path)
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if err != nil {
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return err
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}
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@ -369,14 +361,6 @@ func ChangesSize(newDir string, changes []Change) int64 {
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return size
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}
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func major(device uint64) uint64 {
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return (device >> 8) & 0xfff
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}
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func minor(device uint64) uint64 {
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return (device & 0xff) | ((device >> 12) & 0xfff00)
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}
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// ExportChanges produces an Archive from the provided changes, relative to dir.
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func ExportChanges(dir string, changes []Change) (Archive, error) {
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reader, writer := io.Pipe()
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@ -12,16 +12,21 @@ import (
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"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
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"github.com/docker/docker/pkg/pools"
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"github.com/docker/docker/pkg/system"
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)
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// ApplyLayer parses a diff in the standard layer format from `layer`, and
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// applies it to the directory `dest`.
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func ApplyLayer(dest string, layer ArchiveReader) error {
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// We need to be able to set any perms
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oldmask := syscall.Umask(0)
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defer syscall.Umask(oldmask)
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oldmask, err := system.Umask(0)
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if err != nil {
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return err
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}
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layer, err := DecompressStream(layer)
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defer system.Umask(oldmask) // ignore err, ErrNotSupportedPlatform
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layer, err = DecompressStream(layer)
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if err != nil {
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return err
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}
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