Golang syscall.UtimesNano函数代码示例

func TestNegativeTime(t *testing.T) {
	ts := NewTestCase(t)
	defer ts.Cleanup()

	_, err := os.Create(ts.origFile)
	if err != nil {
		t.Fatalf("Create failed: %v", err)
	}

	var stat syscall.Stat_t

	// set negative nanosecond will occur errors on UtimesNano as invalid argument
	ut := time.Date(1960, time.January, 10, 23, 0, 0, 0, time.UTC)
	tim := []syscall.Timespec{
		syscall.NsecToTimespec(ut.UnixNano()),
		syscall.NsecToTimespec(ut.UnixNano()),
	}
	err = syscall.UtimesNano(ts.mountFile, tim)
	if err != nil {
		t.Fatalf("UtimesNano failed: %v", err)
	}
	err = syscall.Lstat(ts.mountFile, &stat)
	if err != nil {
		t.Fatalf("Lstat failed: %v", err)
	}

	if stat.Atim.Sec >= 0 || stat.Mtim.Sec >= 0 {
		t.Errorf("Got wrong timestamps %v", stat)
	}
}

func touch(name string) {
	st, err := stat(name)
	if err != nil {
		if !os.IsNotExist(err) {
			ek(err)
			return
		}

		if *cflag {
			return
		}
	} else {
		if !*aflag {
			times[0] = st.Atim
		}
		if !*mflag {
			times[1] = st.Mtim
		}
		err = syscall.UtimesNano(name, []syscall.Timespec{times[0], times[1]})
		ek(err)
		return
	}

	f, err := os.OpenFile(name, os.O_CREATE|os.O_EXCL, 0644)
	if ek(err) {
		return
	}
	f.Close()

	touch(name)
}

// Setting nanoseconds should work for dates after 1970
func TestUtimesNano(t *testing.T) {
	tc := NewTestCase(t)
	defer tc.Cleanup()

	path := tc.mountFile
	err := ioutil.WriteFile(path, []byte("xyz"), 0600)
	if err != nil {
		t.Fatal(err)
	}
	ts := make([]syscall.Timespec, 2)
	// atime
	ts[0].Sec = 1
	ts[0].Nsec = 2
	// mtime
	ts[1].Sec = 3
	ts[1].Nsec = 4
	err = syscall.UtimesNano(path, ts)
	if err != nil {
		t.Fatal(err)
	}

	var st syscall.Stat_t
	err = syscall.Stat(path, &st)
	if err != nil {
		t.Fatal(err)
	}
	if st.Atim != ts[0] {
		t.Errorf("Wrong atime: %v, want: %v", st.Atim, ts[0])
	}
	if st.Mtim != ts[1] {
		t.Errorf("Wrong mtime: %v, want: %v", st.Mtim, ts[1])
	}
}

func setZeroModTime(filename string) error {
	var utimes = []syscall.Timespec{
		syscall.NsecToTimespec(0),
		syscall.NsecToTimespec(0),
	}

	return syscall.UtimesNano(filename, utimes)
}

func UtimesNano(path string, atime time.Time, mtime time.Time) error {
	var utimes [2]syscall.Timespec
	utimes[0] = syscall.NsecToTimespec(atime.UnixNano())
	utimes[1] = syscall.NsecToTimespec(mtime.UnixNano())
	if err := syscall.UtimesNano(path, utimes[0:]); err != nil {
		return &os.PathError{"chtimes", path, err}
	}
	return nil
}

// RSyncWithDelete syncs srcDir to destDir
func RSyncWithDelete(srcDirName, destDirName string) error {
	// first remove everything thats not in srcdir
	err := filepath.Walk(destDirName, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// relative to the root "destDirName"
		relPath := path[len(destDirName):]
		if !FileExists(filepath.Join(srcDirName, relPath)) {
			if err := os.RemoveAll(path); err != nil {
				return err
			}
			if info.IsDir() {
				return filepath.SkipDir
			}
		}
		return nil
	})
	if err != nil {
		return err
	}

	// then copy or update the data from srcdir to destdir
	err = filepath.Walk(srcDirName, func(src string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// relative to the root "srcDirName"
		relPath := src[len(srcDirName):]
		dst := filepath.Join(destDirName, relPath)
		if info.IsDir() {
			if err := os.MkdirAll(dst, info.Mode()); err != nil {
				return err
			}

			// this can panic. The alternative would be to use the "st, ok" pattern, and then if !ok... panic?
			st := info.Sys().(*syscall.Stat_t)
			ts := []syscall.Timespec{st.Atim, st.Mtim}

			return syscall.UtimesNano(dst, ts)
		}
		if !FilesAreEqual(src, dst) {
			// XXX: we should (eventually) use CopyFile here,
			//      but we need to teach it about preserving
			//      of atime/mtime and permissions
			output, err := exec.Command("cp", "-va", src, dst).CombinedOutput()
			if err != nil {
				return fmt.Errorf("Failed to copy %s to %s (%s)", src, dst, output)
			}
		}
		return nil
	})

	return err
}

// Chtimes changes the access and modification times of the named
// file, similar to the Unix utime() or utimes() functions.
//
// The underlying filesystem may truncate or round the values to a
// less precise time unit.
// If there is an error, it will be of type *PathError.
func Chtimes(name string, atime time.Time, mtime time.Time) error {
	var utimes [2]syscall.Timespec
	utimes[0] = syscall.NsecToTimespec(atime.UnixNano())
	utimes[1] = syscall.NsecToTimespec(mtime.UnixNano())
	if e := syscall.UtimesNano(name, utimes[0:]); e != nil {
		return &PathError{"chtimes", name, e}
	}
	return nil
}

func (node Node) RestoreTimestamps(path string) error {
	var utimes = [...]syscall.Timespec{
		syscall.NsecToTimespec(node.AccessTime.UnixNano()),
		syscall.NsecToTimespec(node.ModTime.UnixNano()),
	}

	if node.Type == "symlink" {
		return node.restoreSymlinkTimestamps(path, utimes)
	}

	if err := syscall.UtimesNano(path, utimes[:]); err != nil {
		return errors.Wrap(err, "UtimesNano")
	}

	return nil
}

func (constor *Constor) createPath(dirpath string) error {
	dirs := strings.Split(dirpath, "/")
	if len(dirs) == 0 {
		return syscall.EIO
	}
	subdir := ""
	for _, dir := range dirs {
		if dir == "" {
			continue
		}
		subdir = Path.Join(subdir, "/", dir)
		li := constor.getLayer(subdir)
		if li == 0 {
			continue
		}
		if li == -1 {
			return syscall.EIO
		}
		stat := syscall.Stat_t{}
		if err := constor.Lstat(subdir, &stat); err != nil {
			return err
		}
		subdirl := Path.Join(constor.layers[0], subdir)
		if err := syscall.Mkdir(subdirl, stat.Mode); err != nil {
			return err
		}
		if err := syscall.Chown(subdirl, int(stat.Uid), int(stat.Gid)); err != nil {
			return err
		}
		if err := syscall.UtimesNano(subdirl, []syscall.Timespec{stat.Atim, stat.Mtim}); err != nil {
			return err
		}
		inoitoa := strconv.Itoa(int(stat.Ino))
		inobyte := []byte(inoitoa)
		if err := syscall.Setxattr(subdirl, INOXATTR, inobyte, 0); err != nil {
			return err
		}
		inode, err := constor.inodemap.findInode(stat.Ino)
		if err != nil {
			return err
		}
		inode.Lock()
		inode.layer = 0
		inode.Unlock()
	}
	return nil
}

func (f *file) Utimens(a *time.Time, m *time.Time) fuse.Status {
	ts := make([]syscall.Timespec, 2)

	if a == nil {
		ts[0].Nsec = _UTIME_OMIT
	} else {
		ts[0].Sec = a.Unix()
	}

	if m == nil {
		ts[1].Nsec = _UTIME_OMIT
	} else {
		ts[1].Sec = m.Unix()
	}

	f.lock.Lock()
	fn := fmt.Sprintf("/proc/self/fd/%d", f.fd.Fd())
	err := syscall.UtimesNano(fn, ts)
	f.lock.Unlock()
	return fuse.ToStatus(err)
}

// ExtractTarInsecure extracts a tarball (from a tar.Reader) into the target
// directory. If pwl is not nil, only the paths in the map are extracted. If
// overwrite is true, existing files will be overwritten.
func ExtractTarInsecure(tr *tar.Reader, target string, overwrite bool, pwl PathWhitelistMap, editor FilePermissionsEditor) error {
	um := syscall.Umask(0)
	defer syscall.Umask(um)

	var dirhdrs []*tar.Header
Tar:
	for {
		hdr, err := tr.Next()
		switch err {
		case io.EOF:
			break Tar
		case nil:
			if pwl != nil {
				relpath := filepath.Clean(hdr.Name)
				if _, ok := pwl[relpath]; !ok {
					continue
				}
			}
			err = extractFile(tr, target, hdr, overwrite, editor)
			if err != nil {
				return fmt.Errorf("error extracting tarball: %v", err)
			}
			if hdr.Typeflag == tar.TypeDir {
				dirhdrs = append(dirhdrs, hdr)
			}
		default:
			return fmt.Errorf("error extracting tarball: %v", err)
		}
	}

	// Restore dirs atime and mtime. This has to be done after extracting
	// as a file extraction will change its parent directory's times.
	for _, hdr := range dirhdrs {
		p := filepath.Join(target, hdr.Name)
		if err := syscall.UtimesNano(p, HdrToTimespec(hdr)); err != nil {
			return err
		}
	}
	return nil
}

//.........这里部分代码省略.........
		return err
	}
	defer decompressedArchive.Close()

	tr := tar.NewReader(decompressedArchive)

	var (
		dirs            []*tar.Header
		create          bool
		multipleEntries bool
	)

	if fi, err := os.Lstat(dest); err != nil {
		if !os.IsNotExist(err) {
			return err
		}
		// destination does not exist, so it is assumed it has to be created.
		create = true
	} else if !fi.IsDir() {
		// destination exists and is not a directory, so it will be overwritten.
		create = true
	}

	// Iterate through the files in the archive.
	for {
		hdr, err := tr.Next()
		if err == io.EOF {
			// end of tar archive
			break
		}
		if err != nil {
			return err
		}

		// Return an error if destination needs to be created and there is more than 1 entry in the tar stream.
		if create && multipleEntries {
			return fmt.Errorf("Trying to untar an archive with multiple entries to an inexistant target `%s`: did you mean `%s` instead?", dest, filepath.Dir(dest))
		}

		// Normalize name, for safety and for a simple is-root check
		hdr.Name = filepath.Clean(hdr.Name)

		if !strings.HasSuffix(hdr.Name, "/") {
			// Not the root directory, ensure that the parent directory exists
			parent := filepath.Dir(hdr.Name)
			parentPath := filepath.Join(dest, parent)
			if _, err := os.Lstat(parentPath); err != nil && os.IsNotExist(err) {
				err = os.MkdirAll(parentPath, 0777)
				if err != nil {
					return err
				}
			}
		}

		var path string
		if create {
			path = dest // we are renaming hdr.Name to dest
		} else {
			path = filepath.Join(dest, hdr.Name)
		}

		// If path exits we almost always just want to remove and replace it
		// The only exception is when it is a directory *and* the file from
		// the layer is also a directory. Then we want to merge them (i.e.
		// just apply the metadata from the layer).
		if fi, err := os.Lstat(path); err == nil {
			if fi.IsDir() && hdr.Name == "." {
				continue
			}
			if !(fi.IsDir() && hdr.Typeflag == tar.TypeDir) {
				if err := os.RemoveAll(path); err != nil {
					return err
				}
			}
		}

		if err := createTarFile(path, dest, hdr, tr, options == nil || !options.NoLchown); err != nil {
			return err
		}

		// Successfully added an entry. Predicting multiple entries for next iteration (not current one).
		multipleEntries = true

		// Directory mtimes must be handled at the end to avoid further
		// file creation in them to modify the directory mtime
		if hdr.Typeflag == tar.TypeDir {
			dirs = append(dirs, hdr)
		}
	}

	for _, hdr := range dirs {
		path := filepath.Join(dest, hdr.Name)
		ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
		if err := syscall.UtimesNano(path, ts); err != nil {
			return err
		}
	}

	return nil
}

//.........这里部分代码省略.........
				err = system.MkdirAll(parentPath, 0600)
				if err != nil {
					return 0, err
				}
			}
		}

		// Skip AUFS metadata dirs
		if strings.HasPrefix(hdr.Name, ".wh..wh.") {
			// Regular files inside /.wh..wh.plnk can be used as hardlink targets
			// We don't want this directory, but we need the files in them so that
			// such hardlinks can be resolved.
			if strings.HasPrefix(hdr.Name, ".wh..wh.plnk") && hdr.Typeflag == tar.TypeReg {
				basename := filepath.Base(hdr.Name)
				aufsHardlinks[basename] = hdr
				if aufsTempdir == "" {
					if aufsTempdir, err = ioutil.TempDir("", "dockerplnk"); err != nil {
						return 0, err
					}
					defer os.RemoveAll(aufsTempdir)
				}
				if err := createTarFile(filepath.Join(aufsTempdir, basename), dest, hdr, tr, true); err != nil {
					return 0, err
				}
			}
			continue
		}
		path := filepath.Join(dest, hdr.Name)
		rel, err := filepath.Rel(dest, path)
		if err != nil {
			return 0, err
		}

		// Note as these operations are platform specific, so must the slash be.
		if strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
			return 0, breakoutError(fmt.Errorf("%q is outside of %q", hdr.Name, dest))
		}
		base := filepath.Base(path)

		if strings.HasPrefix(base, ".wh.") {
			originalBase := base[len(".wh."):]
			originalPath := filepath.Join(filepath.Dir(path), originalBase)
			if err := os.RemoveAll(originalPath); err != nil {
				return 0, err
			}
		} else {
			// If path exits we almost always just want to remove and replace it.
			// The only exception is when it is a directory *and* the file from
			// the layer is also a directory. Then we want to merge them (i.e.
			// just apply the metadata from the layer).
			if fi, err := os.Lstat(path); err == nil {
				if !(fi.IsDir() && hdr.Typeflag == tar.TypeDir) {
					if err := os.RemoveAll(path); err != nil {
						return 0, err
					}
				}
			}

			trBuf.Reset(tr)
			srcData := io.Reader(trBuf)
			srcHdr := hdr

			// Hard links into /.wh..wh.plnk don't work, as we don't extract that directory, so
			// we manually retarget these into the temporary files we extracted them into
			if hdr.Typeflag == tar.TypeLink && strings.HasPrefix(filepath.Clean(hdr.Linkname), ".wh..wh.plnk") {
				linkBasename := filepath.Base(hdr.Linkname)
				srcHdr = aufsHardlinks[linkBasename]
				if srcHdr == nil {
					return 0, fmt.Errorf("Invalid aufs hardlink")
				}
				tmpFile, err := os.Open(filepath.Join(aufsTempdir, linkBasename))
				if err != nil {
					return 0, err
				}
				defer tmpFile.Close()
				srcData = tmpFile
			}

			if err := createTarFile(path, dest, srcHdr, srcData, true); err != nil {
				return 0, err
			}

			// Directory mtimes must be handled at the end to avoid further
			// file creation in them to modify the directory mtime
			if hdr.Typeflag == tar.TypeDir {
				dirs = append(dirs, hdr)
			}
		}
	}

	for _, hdr := range dirs {
		path := filepath.Join(dest, hdr.Name)
		ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
		if err := syscall.UtimesNano(path, ts); err != nil {
			return 0, err
		}
	}

	return size, nil
}

func Unpack(decompressedArchive io.Reader, dest string, options *TarOptions) error {
	tr := tar.NewReader(decompressedArchive)
	trBuf := pools.BufioReader32KPool.Get(nil)
	defer pools.BufioReader32KPool.Put(trBuf)

	var dirs []*tar.Header

	// Iterate through the files in the archive.
loop:
	for {
		hdr, err := tr.Next()
		if err == io.EOF {
			// end of tar archive
			break
		}
		if err != nil {
			return err
		}

		// Normalize name, for safety and for a simple is-root check
		// This keeps "../" as-is, but normalizes "/../" to "/". Or Windows:
		// This keeps "..\" as-is, but normalizes "\..\" to "\".
		hdr.Name = filepath.Clean(hdr.Name)

		for _, exclude := range options.ExcludePatterns {
			if strings.HasPrefix(hdr.Name, exclude) {
				continue loop
			}
		}

		// After calling filepath.Clean(hdr.Name) above, hdr.Name will now be in
		// the filepath format for the OS on which the daemon is running. Hence
		// the check for a slash-suffix MUST be done in an OS-agnostic way.
		if !strings.HasSuffix(hdr.Name, string(os.PathSeparator)) {
			// Not the root directory, ensure that the parent directory exists
			parent := filepath.Dir(hdr.Name)
			parentPath := filepath.Join(dest, parent)
			if _, err := os.Lstat(parentPath); err != nil && os.IsNotExist(err) {
				err = system.MkdirAll(parentPath, 0777)
				if err != nil {
					return err
				}
			}
		}

		path := filepath.Join(dest, hdr.Name)
		rel, err := filepath.Rel(dest, path)
		if err != nil {
			return err
		}
		if strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
			return breakoutError(fmt.Errorf("%q is outside of %q", hdr.Name, dest))
		}

		// If path exits we almost always just want to remove and replace it
		// The only exception is when it is a directory *and* the file from
		// the layer is also a directory. Then we want to merge them (i.e.
		// just apply the metadata from the layer).
		if fi, err := os.Lstat(path); err == nil {
			if options.NoOverwriteDirNonDir && fi.IsDir() && hdr.Typeflag != tar.TypeDir {
				// If NoOverwriteDirNonDir is true then we cannot replace
				// an existing directory with a non-directory from the archive.
				return fmt.Errorf("cannot overwrite directory %q with non-directory %q", path, dest)
			}

			if options.NoOverwriteDirNonDir && !fi.IsDir() && hdr.Typeflag == tar.TypeDir {
				// If NoOverwriteDirNonDir is true then we cannot replace
				// an existing non-directory with a directory from the archive.
				return fmt.Errorf("cannot overwrite non-directory %q with directory %q", path, dest)
			}

			if fi.IsDir() && hdr.Name == "." {
				continue
			}

			if !(fi.IsDir() && hdr.Typeflag == tar.TypeDir) {
				if err := os.RemoveAll(path); err != nil {
					return err
				}
			}
		}
		trBuf.Reset(tr)

		if err := createTarFile(path, dest, hdr, trBuf, !options.NoLchown, options.ChownOpts); err != nil {
			return err
		}

		// Directory mtimes must be handled at the end to avoid further
		// file creation in them to modify the directory mtime
		if hdr.Typeflag == tar.TypeDir {
			dirs = append(dirs, hdr)
		}
	}

	for _, hdr := range dirs {
		path := filepath.Join(dest, hdr.Name)
		ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
		if err := syscall.UtimesNano(path, ts); err != nil {
			return err
		}
//.........这里部分代码省略.........

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 {
//.........这里部分代码省略.........