// explicitly setting that. Otherwise it might get out of sync with FindFirstFile. See golang.org/issues/42637.
	if err := filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			t.Fatal(err)
		}
		info, err := d.Info()
		if err != nil {
			t.Fatal(err)
		}

		// Add a trailing separator to force that to happen.
		root := testenv.GOROOT(t)
		if !os.IsPathSeparator(root[len(root)-1]) {
			root += string(filepath.Separator)
		}
		goroot.err = filepath.WalkDir(root, func(path string, info fs.DirEntry, err error) error {
			if err != nil {
				return err
			}
			if info.IsDir() && path != root && (info.Name() == "vendor" || info.Name() == "testdata") {

}

// UpdatePathOwner recursively updates the owners of a directory.
// 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)
		}

// It walks the directory tree starting at the root of the filesystem
// 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
		}

	if !*testWork {
		removeAll(testTmpDir) // os.Exit won't run defer
	}

	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
			}

// 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.

// 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
		}

	if err != nil {
		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 {

			bdst.WriteByte(0)
		}
	}
	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"):

		mode os.FileMode
	}
	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" {