Example #1
0
func populateHeaderUnix(h *tar.Header, fi os.FileInfo, seen map[uint64]string) {
	st, ok := fi.Sys().(*syscall.Stat_t)
	if !ok {
		return
	}
	h.Uid = int(st.Uid)
	h.Gid = int(st.Gid)
	if st.Mode&syscall.S_IFMT == syscall.S_IFBLK || st.Mode&syscall.S_IFMT == syscall.S_IFCHR {
		h.Devminor = int64(device.Minor(uint64(st.Rdev)))
		h.Devmajor = int64(device.Major(uint64(st.Rdev)))
	}
	// If we have already seen this inode, generate a hardlink
	p, ok := seen[uint64(st.Ino)]
	if ok {
		h.Linkname = p
		h.Typeflag = tar.TypeLink
	} else {
		seen[uint64(st.Ino)] = h.Name
	}
}
Example #2
0
func CopyTree(src, dest string, uidRange *user.UidRange) error {
	cleanSrc := filepath.Clean(src)

	dirs := make(map[string][]syscall.Timespec)
	copyWalker := func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		rootLess := path[len(cleanSrc):]
		target := filepath.Join(dest, rootLess)
		mode := info.Mode()
		switch {
		case mode.IsDir():
			err := os.Mkdir(target, mode.Perm())
			if err != nil {
				return err
			}

			dir, err := os.Open(target)
			if err != nil {
				return err
			}
			if err := dir.Chmod(mode); err != nil {
				dir.Close()
				return err
			}
			dir.Close()
		case mode.IsRegular():
			if err := CopyRegularFile(path, target); err != nil {
				return err
			}
		case mode&os.ModeSymlink == os.ModeSymlink:
			if err := CopySymlink(path, target); err != nil {
				return err
			}
		case mode&os.ModeCharDevice == os.ModeCharDevice:
			stat := syscall.Stat_t{}
			if err := syscall.Stat(path, &stat); err != nil {
				return err
			}

			dev := device.Makedev(device.Major(stat.Rdev), device.Minor(stat.Rdev))
			mode := uint32(mode) | syscall.S_IFCHR
			if err := syscall.Mknod(target, mode, int(dev)); err != nil {
				return err
			}
		case mode&os.ModeDevice == os.ModeDevice:
			stat := syscall.Stat_t{}
			if err := syscall.Stat(path, &stat); err != nil {
				return err
			}

			dev := device.Makedev(device.Major(stat.Rdev), device.Minor(stat.Rdev))
			mode := uint32(mode) | syscall.S_IFBLK
			if err := syscall.Mknod(target, mode, int(dev)); err != nil {
				return err
			}
		case mode&os.ModeNamedPipe == os.ModeNamedPipe:
			if err := syscall.Mkfifo(target, uint32(mode)); err != nil {
				return err
			}
		default:
			return fmt.Errorf("unsupported mode: %v", mode)
		}

		var srcUid = info.Sys().(*syscall.Stat_t).Uid
		var srcGid = info.Sys().(*syscall.Stat_t).Gid

		shiftedUid, shiftedGid, err := uidRange.ShiftRange(srcUid, srcGid)
		if err != nil {
			return err
		}

		if err := os.Lchown(target, int(shiftedUid), int(shiftedGid)); err != nil {
			return err
		}

		// lchown(2) says that, depending on the linux kernel version, it
		// can change the file's mode also if executed as root. So call
		// os.Chmod after it.
		if mode&os.ModeSymlink != os.ModeSymlink {
			if err := os.Chmod(target, mode); err != nil {
				return err
			}
		}

		ts, err := pathToTimespec(path)
		if err != nil {
			return err
		}

		if mode.IsDir() {
			dirs[target] = ts
		}
		if mode&os.ModeSymlink != os.ModeSymlink {
			if err := syscall.UtimesNano(target, ts); err != nil {
				return err
			}
		} else {
			if err := LUtimesNano(target, ts); err != nil {
				return err
			}
		}

		return nil
	}

	if err := filepath.Walk(cleanSrc, copyWalker); err != nil {
		return err
	}

	// Restore dirs atime and mtime. This has to be done after copying
	// as a file copying will change its parent directory's times.
	for dirPath, ts := range dirs {
		if err := syscall.UtimesNano(dirPath, ts); err != nil {
			return err
		}
	}

	return nil
}