// adding each file to the tar archive while maintaining the directory structure.
func (tw *Writer) AddFS(fsys fs.FS) error {
	return fs.WalkDir(fsys, ".", func(name string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}
		info, err := d.Info()
		if err != nil {
			return err
		}

// It is equivalent to calling `chown -R uid:gid /path/to/dir`.
func UpdatePathOwner(dirPath string, uid, gid int64) error {
	err := filepath.WalkDir(dirPath, func(path string, d os.DirEntry, err error) error {
		if err := os.Chown(path, int(uid), int(gid)); err != nil {
			return errors.Wrapf(err, "failed to update owner of %q to uid: %d and gid: %d", path, uid, gid)
		}
		return nil
	})
	return err

	}

	if !*testWork {
		// There shouldn't be anything left in topTmpdir.
		var extraFiles, extraDirs []string
		err := filepath.WalkDir(topTmpdir, func(path string, d fs.DirEntry, err error) error {
			if err != nil {
				return err
			}
			if path == topTmpdir {
				return nil
			}

			if rel, err := filepath.Rel(topTmpdir, path); err == nil {
				path = rel
			}

// needed in order to remove their contents.
func removeAll(dir string) error {
	// module cache has 0444 directories;
	// make them writable in order to remove content.
	filepath.WalkDir(dir, func(path string, info fs.DirEntry, err error) error {
		// chmod not only directories, but also things that we couldn't even stat
		// due to permission errors: they may also be unreadable directories.
		if err != nil || info.IsDir() {

}

func (t test) goDirName() string {
	return filepath.Join(t.dir, strings.Replace(t.goFile, ".go", ".dir", -1))
}

// goDirFiles returns .go files in dir.
func goDirFiles(dir string) (filter []fs.DirEntry, _ error) {
	files, err := os.ReadDir(dir)
	if err != nil {
		return nil, err
	}
	for _, goFile := range files {
		if filepath.Ext(goFile.Name()) == ".go" {
			filter = append(filter, goFile)
		}
	}

	}
	return b, nil
}

// ReadDir reads the named directory, returning all its directory entries sorted
// by filename. Through this method, dirFS implements [io/fs.ReadDirFS].
func (dir dirFS) ReadDir(name string) ([]DirEntry, error) {
	fullname, err := dir.join(name)
	if err != nil {
		return nil, &PathError{Op: "readdir", Path: name, Err: err}
	}
	entries, err := ReadDir(fullname)
	if err != nil {

// they are all added to the returned slice.
func loadObjects(dir string) []*unstructured.Unstructured {
	result := []*unstructured.Unstructured{}
	err := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		} else if d.IsDir() {
			return nil
		} else if filepath.Ext(d.Name()) != ".yaml" {
			return nil
		}
		// Read the file in as []byte

		return fmt.Errorf("failed to marshal base config: %w", err)
	}
	// Walk through the drop-in directory and update the configuration for each file
	if err := filepath.WalkDir(kubeletDropInConfigDir, func(path string, info fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() && filepath.Ext(info.Name()) == dropinFileExtension {
			dropinConfigJSON, err := loadDropinConfigFileIntoJSON(path)
			if err != nil {

	}
	writefile(bdst.String(), dst, 0)
}

func clean() {
	generated := []byte(generatedHeader)

	// Remove generated source files.
	filepath.WalkDir(pathf("%s/src", goroot), func(path string, d fs.DirEntry, err error) error {
		switch {
		case err != nil:
			// ignore
		case d.IsDir() && (d.Name() == "vendor" || d.Name() == "testdata"):
			return filepath.SkipDir
		case d.IsDir() && d.Name() != "dist":

	var dirs []pathMode // in lexical order

	undo = func() {
		for i := range dirs {
			os.Chmod(dirs[i].path, dirs[i].mode) // best effort
		}
	}

	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if suffix := strings.TrimPrefix(path, dir+string(filepath.Separator)); suffix != "" {
			if suffix == ".git" {
				// Leave Git metadata in whatever state it was in. It may contain a lot