mirror of
https://github.com/moby/moby.git
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116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
//go:build !windows
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// +build !windows
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package archive // import "github.com/docker/docker/pkg/archive"
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import (
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"archive/tar"
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"errors"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"github.com/containerd/containerd/pkg/userns"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/system"
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"golang.org/x/sys/unix"
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)
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// fixVolumePathPrefix does platform specific processing to ensure that if
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// the path being passed in is not in a volume path format, convert it to one.
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func fixVolumePathPrefix(srcPath string) string {
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return srcPath
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}
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// getWalkRoot calculates the root path when performing a TarWithOptions.
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// We use a separate function as this is platform specific. On Linux, we
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// can't use filepath.Join(srcPath,include) because this will clean away
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// a trailing "." or "/" which may be important.
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func getWalkRoot(srcPath string, include string) string {
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return strings.TrimSuffix(srcPath, string(filepath.Separator)) + string(filepath.Separator) + include
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}
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// CanonicalTarNameForPath returns platform-specific filepath
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// to canonical posix-style path for tar archival. p is relative
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// path.
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func CanonicalTarNameForPath(p string) string {
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return p // already unix-style
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}
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// chmodTarEntry is used to adjust the file permissions used in tar header based
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// on the platform the archival is done.
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func chmodTarEntry(perm os.FileMode) os.FileMode {
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return perm // noop for unix as golang APIs provide perm bits correctly
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}
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func setHeaderForSpecialDevice(hdr *tar.Header, name string, stat interface{}) (err error) {
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s, ok := stat.(*syscall.Stat_t)
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if ok {
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// Currently go does not fill in the major/minors
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if s.Mode&unix.S_IFBLK != 0 ||
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s.Mode&unix.S_IFCHR != 0 {
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hdr.Devmajor = int64(unix.Major(uint64(s.Rdev))) //nolint: unconvert
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hdr.Devminor = int64(unix.Minor(uint64(s.Rdev))) //nolint: unconvert
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}
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}
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return
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}
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func getInodeFromStat(stat interface{}) (inode uint64, err error) {
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s, ok := stat.(*syscall.Stat_t)
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if ok {
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inode = s.Ino
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}
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return
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}
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func getFileUIDGID(stat interface{}) (idtools.Identity, error) {
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s, ok := stat.(*syscall.Stat_t)
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if !ok {
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return idtools.Identity{}, errors.New("cannot convert stat value to syscall.Stat_t")
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}
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return idtools.Identity{UID: int(s.Uid), GID: int(s.Gid)}, nil
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}
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// handleTarTypeBlockCharFifo is an OS-specific helper function used by
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// createTarFile to handle the following types of header: Block; Char; Fifo
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func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
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mode := uint32(hdr.Mode & 07777)
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switch hdr.Typeflag {
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case tar.TypeBlock:
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mode |= unix.S_IFBLK
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case tar.TypeChar:
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mode |= unix.S_IFCHR
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case tar.TypeFifo:
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mode |= unix.S_IFIFO
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}
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err := system.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor)))
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if errors.Is(err, syscall.EPERM) && userns.RunningInUserNS() {
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// In most cases, cannot create a device if running in user namespace
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err = nil
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}
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return err
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}
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func handleLChmod(hdr *tar.Header, path string, hdrInfo os.FileInfo) error {
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if hdr.Typeflag == tar.TypeLink {
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if fi, err := os.Lstat(hdr.Linkname); err == nil && (fi.Mode()&os.ModeSymlink == 0) {
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if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
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return err
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}
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}
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} else if hdr.Typeflag != tar.TypeSymlink {
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if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
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return err
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}
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}
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return nil
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}
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