}
	}

	return nil
}

// IsDir returns true if path is a directory on disk or in the
// overlay.
func IsDir(path string) (bool, error) {
	Trace("IsDir", path)
	path = canonicalize(path)

	if _, ok := parentIsOverlayFile(path); ok {
		return false, nil
	}

	if n, ok := overlay[path]; ok {
		return n.isDir(), nil
	}

	fi, err := os.Stat(path)
	if err != nil {

        def binDir = jdkHome.createDir("bin")
        binDir.createFile(OperatingSystem.current().getExecutableName("java"))
        return jdkHome
    }

    private TestFile createJreInstallation(String version) {
        def jdkHome = temporaryFolder.createDir("jdk-$version")
        def jreHome = jdkHome.file("jre").createDir()
        def binDir = jreHome.createDir("bin")

// comment in the FS struct above. isDir reports whether the
// final trailing slash was present, indicating that name is a directory.
func split(name string) (dir, elem string, isDir bool) {
	name, isDir = stringslite.CutSuffix(name, "/")
	i := bytealg.LastIndexByteString(name, '/')
	if i < 0 {
		return ".", name, isDir
	}
	return name[:i], name[i+1:], isDir
}

var (
	_ fs.ReadDirFS  = FS{}

	if err != nil {
		return ErrNotIndexed
	}
	// stop at module boundaries
	if info.IsDir() && path != root {
		if fi, err := fsys.Stat(filepath.Join(path, "go.mod")); err == nil && !fi.IsDir() {
			return filepath.SkipDir
		}
	}
	if info.Mode()&fs.ModeSymlink != 0 {
		if target, err := fsys.Stat(path); err == nil && target.IsDir() {
			// return an error to make the module hash invalid.

// for each version in the bundledVersions list.
func validateBundledVersions(bundledVersions SupportedVersions, binDir string) error {
	for _, v := range bundledVersions {
		for _, binaryName := range []string{"etcd", "etcdctl"} {
			fn := filepath.Join(binDir, fmt.Sprintf("%s-%s", binaryName, v))
			if _, err := os.Stat(fn); err != nil {

	for _, root := range rootNames {
		fi, err := os.Stat(filepath.Join(dir, root.filename))
		if err == nil && fi.IsDir() == root.isDir {
			return true
		}
	}

	return false
}

type rootName struct {
	filename string
	isDir    bool
}

type vcsNotFoundError struct {
	dir string
}

func (e *vcsNotFoundError) Error() string {

func formatEntry(entry fs.DirEntry) string {
	return fmt.Sprintf("%s IsDir=%v Type=%v", entry.Name(), entry.IsDir(), entry.Type())
}

// formatInfoEntry formats an fs.FileInfo into a string like the result of formatEntry, for error messages and comparison.
func formatInfoEntry(info fs.FileInfo) string {
	return fmt.Sprintf("%s IsDir=%v Type=%v", info.Name(), info.IsDir(), info.Mode().Type())
}

	t.Helper()
	if !fi.IsDir() {
		t.Errorf("%q should be a directory", path)
	}
	if fi.Mode()&fs.ModeSymlink != 0 {
		t.Errorf("%q should not be a symlink", path)
	}
}

// testIsSymlink verifies that fi refers to symlink.
func testIsSymlink(t *testing.T, path string, fi fs.FileInfo) {
	t.Helper()
	if fi.IsDir() {
		t.Errorf("%q should not be a directory", path)
	}

		return bytealg.CompareString(a.Name(), b.Name())
	})
	return list, err
}

// dirInfo is a DirEntry based on a FileInfo.
type dirInfo struct {
	fileInfo FileInfo
}

func (di dirInfo) IsDir() bool {
	return di.fileInfo.IsDir()
}

func (di dirInfo) Type() FileMode {
	return di.fileInfo.Mode().Type()
}

func (di dirInfo) Info() (FileInfo, error) {
	return di.fileInfo, nil
}

	}
	return names, dirents, infos, nil
}

type dirEntry struct {
	fs *fileStat
}

func (de dirEntry) Name() string            { return de.fs.Name() }
func (de dirEntry) IsDir() bool             { return de.fs.IsDir() }
func (de dirEntry) Type() FileMode          { return de.fs.Mode().Type() }
func (de dirEntry) Info() (FileInfo, error) { return de.fs, nil }

func (de dirEntry) String() string {