src/path/filepath/path_windows_test.go - go - Git at Google

 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package filepath_test

 import (
 	"flag"
 	"fmt"
 	"internal/testenv"
 	"io/fs"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"reflect"
 	"runtime/debug"
 	"strings"
 	"testing"
 )

 func TestWinSplitListTestsAreValid(t *testing.T) {
 	comspec := os.Getenv("ComSpec")
 	if comspec == "" {
 		t.Fatal("%ComSpec% must be set")
 	}

 	for ti, tt := range winsplitlisttests {
 		testWinSplitListTestIsValid(t, ti, tt, comspec)
 	}
 }

 func testWinSplitListTestIsValid(t *testing.T, ti int, tt SplitListTest,
 	comspec string) {

 	const (
 		cmdfile             = `printdir.cmd`
 		perm    fs.FileMode = 0700
 	)

 	tmp := t.TempDir()
 	for i, d := range tt.result {
 		if d == "" {
 			continue
 		}
 		if cd := filepath.Clean(d); filepath.VolumeName(cd) != "" ||
 			cd[0] == '\\' || cd == ".." || (len(cd) >= 3 && cd[0:3] == `..\`) {
 			t.Errorf("%d,%d: %#q refers outside working directory", ti, i, d)
 			return
 		}
 		dd := filepath.Join(tmp, d)
 		if _, err := os.Stat(dd); err == nil {
 			t.Errorf("%d,%d: %#q already exists", ti, i, d)
 			return
 		}
 		if err := os.MkdirAll(dd, perm); err != nil {
 			t.Errorf("%d,%d: MkdirAll(%#q) failed: %v", ti, i, dd, err)
 			return
 		}
 		fn, data := filepath.Join(dd, cmdfile), []byte("@echo "+d+"\r\n")
 		if err := os.WriteFile(fn, data, perm); err != nil {
 			t.Errorf("%d,%d: WriteFile(%#q) failed: %v", ti, i, fn, err)
 			return
 		}
 	}

 	// on some systems, SystemRoot is required for cmd to work
 	systemRoot := os.Getenv("SystemRoot")

 	for i, d := range tt.result {
 		if d == "" {
 			continue
 		}
 		exp := []byte(d + "\r\n")
 		cmd := &exec.Cmd{
 			Path: comspec,
 			Args: []string{`/c`, cmdfile},
 			Env:  []string{`Path=` + systemRoot + "/System32;" + tt.list, `SystemRoot=` + systemRoot},
 			Dir:  tmp,
 		}
 		out, err := cmd.CombinedOutput()
 		switch {
 		case err != nil:
 			t.Errorf("%d,%d: execution error %v\n%q", ti, i, err, out)
 			return
 		case !reflect.DeepEqual(out, exp):
 			t.Errorf("%d,%d: expected %#q, got %#q", ti, i, exp, out)
 			return
 		default:
 			// unshadow cmdfile in next directory
 			err = os.Remove(filepath.Join(tmp, d, cmdfile))
 			if err != nil {
 				t.Fatalf("Remove test command failed: %v", err)
 			}
 		}
 	}
 }

 func TestWindowsEvalSymlinks(t *testing.T) {
 	testenv.MustHaveSymlink(t)

 	tmpDir := tempDirCanonical(t)

 	if len(tmpDir) < 3 {
 		t.Fatalf("tmpDir path %q is too short", tmpDir)
 	}
 	if tmpDir[1] != ':' {
 		t.Fatalf("tmpDir path %q must have drive letter in it", tmpDir)
 	}
 	test := EvalSymlinksTest{"test/linkabswin", tmpDir[:3]}

 	// Create the symlink farm using relative paths.
 	testdirs := append(EvalSymlinksTestDirs, test)
 	for _, d := range testdirs {
 		var err error
 		path := simpleJoin(tmpDir, d.path)
 		if d.dest == "" {
 			err = os.Mkdir(path, 0755)
 		} else {
 			err = os.Symlink(d.dest, path)
 		}
 		if err != nil {
 			t.Fatal(err)
 		}
 	}

 	path := simpleJoin(tmpDir, test.path)

 	testEvalSymlinks(t, path, test.dest)

 	testEvalSymlinksAfterChdir(t, path, ".", test.dest)

 	testEvalSymlinksAfterChdir(t,
 		path,
 		filepath.VolumeName(tmpDir)+".",
 		test.dest)

 	testEvalSymlinksAfterChdir(t,
 		simpleJoin(tmpDir, "test"),
 		simpleJoin("..", test.path),
 		test.dest)

 	testEvalSymlinksAfterChdir(t, tmpDir, test.path, test.dest)
 }

 // TestEvalSymlinksCanonicalNames verify that EvalSymlinks
 // returns "canonical" path names on windows.
 func TestEvalSymlinksCanonicalNames(t *testing.T) {
 	ctmp := tempDirCanonical(t)
 	dirs := []string{
 		"test",
 		"test/dir",
 		"testing_long_dir",
 		"TEST2",
 	}

 	for _, d := range dirs {
 		dir := filepath.Join(ctmp, d)
 		err := os.Mkdir(dir, 0755)
 		if err != nil {
 			t.Fatal(err)
 		}
 		cname, err := filepath.EvalSymlinks(dir)
 		if err != nil {
 			t.Errorf("EvalSymlinks(%q) error: %v", dir, err)
 			continue
 		}
 		if dir != cname {
 			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", dir, cname, dir)
 			continue
 		}
 		// test non-canonical names
 		test := strings.ToUpper(dir)
 		p, err := filepath.EvalSymlinks(test)
 		if err != nil {
 			t.Errorf("EvalSymlinks(%q) error: %v", test, err)
 			continue
 		}
 		if p != cname {
 			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
 			continue
 		}
 		// another test
 		test = strings.ToLower(dir)
 		p, err = filepath.EvalSymlinks(test)
 		if err != nil {
 			t.Errorf("EvalSymlinks(%q) error: %v", test, err)
 			continue
 		}
 		if p != cname {
 			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
 			continue
 		}
 	}
 }

 // checkVolume8dot3Setting runs "fsutil 8dot3name query c:" command
 // (where c: is vol parameter) to discover "8dot3 name creation state".
 // The state is combination of 2 flags. The global flag controls if it
 // is per volume or global setting:
 //   0 - Enable 8dot3 name creation on all volumes on the system
 //   1 - Disable 8dot3 name creation on all volumes on the system
 //   2 - Set 8dot3 name creation on a per volume basis
 //   3 - Disable 8dot3 name creation on all volumes except the system volume
 // If global flag is set to 2, then per-volume flag needs to be examined:
 //   0 - Enable 8dot3 name creation on this volume
 //   1 - Disable 8dot3 name creation on this volume
 // checkVolume8dot3Setting verifies that "8dot3 name creation" flags
 // are set to 2 and 0, if enabled parameter is true, or 2 and 1, if enabled
 // is false. Otherwise checkVolume8dot3Setting returns error.
 func checkVolume8dot3Setting(vol string, enabled bool) error {
 	// It appears, on some systems "fsutil 8dot3name query ..." command always
 	// exits with error. Ignore exit code, and look at fsutil output instead.
 	out, _ := exec.Command("fsutil", "8dot3name", "query", vol).CombinedOutput()
 	// Check that system has "Volume level setting" set.
 	expected := "The registry state of NtfsDisable8dot3NameCreation is 2, the default (Volume level setting)"
 	if !strings.Contains(string(out), expected) {
 		// Windows 10 version of fsutil has different output message.
 		expectedWindow10 := "The registry state is: 2 (Per volume setting - the default)"
 		if !strings.Contains(string(out), expectedWindow10) {
 			return fmt.Errorf("fsutil output should contain %q, but is %q", expected, string(out))
 		}
 	}
 	// Now check the volume setting.
 	expected = "Based on the above two settings, 8dot3 name creation is %s on %s"
 	if enabled {
 		expected = fmt.Sprintf(expected, "enabled", vol)
 	} else {
 		expected = fmt.Sprintf(expected, "disabled", vol)
 	}
 	if !strings.Contains(string(out), expected) {
 		return fmt.Errorf("unexpected fsutil output: %q", string(out))
 	}
 	return nil
 }

 func setVolume8dot3Setting(vol string, enabled bool) error {
 	cmd := []string{"fsutil", "8dot3name", "set", vol}
 	if enabled {
 		cmd = append(cmd, "0")
 	} else {
 		cmd = append(cmd, "1")
 	}
 	// It appears, on some systems "fsutil 8dot3name set ..." command always
 	// exits with error. Ignore exit code, and look at fsutil output instead.
 	out, _ := exec.Command(cmd[0], cmd[1:]...).CombinedOutput()
 	if string(out) != "\r\nSuccessfully set 8dot3name behavior.\r\n" {
 		// Windows 10 version of fsutil has different output message.
 		expectedWindow10 := "Successfully %s 8dot3name generation on %s\r\n"
 		if enabled {
 			expectedWindow10 = fmt.Sprintf(expectedWindow10, "enabled", vol)
 		} else {
 			expectedWindow10 = fmt.Sprintf(expectedWindow10, "disabled", vol)
 		}
 		if string(out) != expectedWindow10 {
 			return fmt.Errorf("%v command failed: %q", cmd, string(out))
 		}
 	}
 	return nil
 }

 var runFSModifyTests = flag.Bool("run_fs_modify_tests", false, "run tests which modify filesystem parameters")

 // This test assumes registry state of NtfsDisable8dot3NameCreation is 2,
 // the default (Volume level setting).
 func TestEvalSymlinksCanonicalNamesWith8dot3Disabled(t *testing.T) {
 	if !*runFSModifyTests {
 		t.Skip("skipping test that modifies file system setting; enable with -run_fs_modify_tests")
 	}
 	tempVol := filepath.VolumeName(os.TempDir())
 	if len(tempVol) != 2 {
 		t.Fatalf("unexpected temp volume name %q", tempVol)
 	}

 	err := checkVolume8dot3Setting(tempVol, true)
 	if err != nil {
 		t.Fatal(err)
 	}
 	err = setVolume8dot3Setting(tempVol, false)
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer func() {
 		err := setVolume8dot3Setting(tempVol, true)
 		if err != nil {
 			t.Fatal(err)
 		}
 		err = checkVolume8dot3Setting(tempVol, true)
 		if err != nil {
 			t.Fatal(err)
 		}
 	}()
 	err = checkVolume8dot3Setting(tempVol, false)
 	if err != nil {
 		t.Fatal(err)
 	}
 	TestEvalSymlinksCanonicalNames(t)
 }

 func TestToNorm(t *testing.T) {
 	stubBase := func(path string) (string, error) {
 		vol := filepath.VolumeName(path)
 		path = path[len(vol):]

 		if strings.Contains(path, "/") {
 			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
 		}

 		if path == "" || path == "." || path == `\` {
 			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
 		}

 		i := strings.LastIndexByte(path, filepath.Separator)
 		if i == len(path)-1 { // trailing '\' is invalid
 			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
 		}
 		if i == -1 {
 			return strings.ToUpper(path), nil
 		}

 		return strings.ToUpper(path[i+1:]), nil
 	}

 	// On this test, toNorm should be same as string.ToUpper(filepath.Clean(path)) except empty string.
 	tests := []struct {
 		arg  string
 		want string
 	}{
 		{"", ""},
 		{".", "."},
 		{"./foo/bar", `FOO\BAR`},
 		{"/", `\`},
 		{"/foo/bar", `\FOO\BAR`},
 		{"/foo/bar/baz/qux", `\FOO\BAR\BAZ\QUX`},
 		{"foo/bar", `FOO\BAR`},
 		{"C:/foo/bar", `C:\FOO\BAR`},
 		{"C:foo/bar", `C:FOO\BAR`},
 		{"c:/foo/bar", `C:\FOO\BAR`},
 		{"C:/foo/bar", `C:\FOO\BAR`},
 		{"C:/foo/bar/", `C:\FOO\BAR`},
 		{`C:\foo\bar`, `C:\FOO\BAR`},
 		{`C:\foo/bar\`, `C:\FOO\BAR`},
 		{"C:/ふー/バー", `C:\ふー\バー`},
 	}

 	for _, test := range tests {
 		got, err := filepath.ToNorm(test.arg, stubBase)
 		if err != nil {
 			t.Errorf("toNorm(%s) failed: %v\n", test.arg, err)
 		} else if got != test.want {
 			t.Errorf("toNorm(%s) returns %s, but %s expected\n", test.arg, got, test.want)
 		}
 	}

 	testPath := `{{tmp}}\test\foo\bar`

 	testsDir := []struct {
 		wd   string
 		arg  string
 		want string
 	}{
 		// test absolute paths
 		{".", `{{tmp}}\test\foo\bar`, `{{tmp}}\test\foo\bar`},
 		{".", `{{tmp}}\.\test/foo\bar`, `{{tmp}}\test\foo\bar`},
 		{".", `{{tmp}}\test\..\test\foo\bar`, `{{tmp}}\test\foo\bar`},
 		{".", `{{tmp}}\TEST\FOO\BAR`, `{{tmp}}\test\foo\bar`},

 		// test relative paths begin with drive letter
 		{`{{tmp}}\test`, `{{tmpvol}}.`, `{{tmpvol}}.`},
 		{`{{tmp}}\test`, `{{tmpvol}}..`, `{{tmpvol}}..`},
 		{`{{tmp}}\test`, `{{tmpvol}}foo\bar`, `{{tmpvol}}foo\bar`},
 		{`{{tmp}}\test`, `{{tmpvol}}.\foo\bar`, `{{tmpvol}}foo\bar`},
 		{`{{tmp}}\test`, `{{tmpvol}}foo\..\foo\bar`, `{{tmpvol}}foo\bar`},
 		{`{{tmp}}\test`, `{{tmpvol}}FOO\BAR`, `{{tmpvol}}foo\bar`},

 		// test relative paths begin with '\'
 		{"{{tmp}}", `{{tmpnovol}}\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
 		{"{{tmp}}", `{{tmpnovol}}\.\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
 		{"{{tmp}}", `{{tmpnovol}}\test\..\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
 		{"{{tmp}}", `{{tmpnovol}}\TEST\FOO\BAR`, `{{tmpnovol}}\test\foo\bar`},

 		// test relative paths begin without '\'
 		{`{{tmp}}\test`, ".", `.`},
 		{`{{tmp}}\test`, "..", `..`},
 		{`{{tmp}}\test`, `foo\bar`, `foo\bar`},
 		{`{{tmp}}\test`, `.\foo\bar`, `foo\bar`},
 		{`{{tmp}}\test`, `foo\..\foo\bar`, `foo\bar`},
 		{`{{tmp}}\test`, `FOO\BAR`, `foo\bar`},

 		// test UNC paths
 		{".", `\\localhost\c$`, `\\localhost\c$`},
 	}

 	ctmp := tempDirCanonical(t)
 	if err := os.MkdirAll(strings.ReplaceAll(testPath, "{{tmp}}", ctmp), 0777); err != nil {
 		t.Fatal(err)
 	}

 	cwd, err := os.Getwd()
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer func() {
 		err := os.Chdir(cwd)
 		if err != nil {
 			t.Fatal(err)
 		}
 	}()

 	tmpVol := filepath.VolumeName(ctmp)
 	if len(tmpVol) != 2 {
 		t.Fatalf("unexpected temp volume name %q", tmpVol)
 	}

 	tmpNoVol := ctmp[len(tmpVol):]

 	replacer := strings.NewReplacer("{{tmp}}", ctmp, "{{tmpvol}}", tmpVol, "{{tmpnovol}}", tmpNoVol)

 	for _, test := range testsDir {
 		wd := replacer.Replace(test.wd)
 		arg := replacer.Replace(test.arg)
 		want := replacer.Replace(test.want)

 		if test.wd == "." {
 			err := os.Chdir(cwd)
 			if err != nil {
 				t.Error(err)

 				continue
 			}
 		} else {
 			err := os.Chdir(wd)
 			if err != nil {
 				t.Error(err)

 				continue
 			}
 		}

 		got, err := filepath.ToNorm(arg, filepath.NormBase)
 		if err != nil {
 			t.Errorf("toNorm(%s) failed: %v (wd=%s)\n", arg, err, wd)
 		} else if got != want {
 			t.Errorf("toNorm(%s) returns %s, but %s expected (wd=%s)\n", arg, got, want, wd)
 		}
 	}
 }

 func TestUNC(t *testing.T) {
 	// Test that this doesn't go into an infinite recursion.
 	// See golang.org/issue/15879.
 	defer debug.SetMaxStack(debug.SetMaxStack(1e6))
 	filepath.Glob(`\\?\c:\*`)
 }

 func testWalkMklink(t *testing.T, linktype string) {
 	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
 	if !strings.Contains(string(output), fmt.Sprintf(" /%s ", linktype)) {
 		t.Skipf(`skipping test; mklink does not supports /%s parameter`, linktype)
 	}
 	testWalkSymlink(t, func(target, link string) error {
 		output, err := exec.Command("cmd", "/c", "mklink", "/"+linktype, link, target).CombinedOutput()
 		if err != nil {
 			return fmt.Errorf(`"mklink /%s %v %v" command failed: %v\n%v`, linktype, link, target, err, string(output))
 		}
 		return nil
 	})
 }

 func TestWalkDirectoryJunction(t *testing.T) {
 	testenv.MustHaveSymlink(t)
 	testWalkMklink(t, "J")
 }

 func TestWalkDirectorySymlink(t *testing.T) {
 	testenv.MustHaveSymlink(t)
 	testWalkMklink(t, "D")
 }

 func TestNTNamespaceSymlink(t *testing.T) {
 	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
 	if !strings.Contains(string(output), " /J ") {
 		t.Skip("skipping test because mklink command does not support junctions")
 	}

 	tmpdir := tempDirCanonical(t)

 	vol := filepath.VolumeName(tmpdir)
 	output, err := exec.Command("cmd", "/c", "mountvol", vol, "/L").CombinedOutput()
 	if err != nil {
 		t.Fatalf("failed to run mountvol %v /L: %v %q", vol, err, output)
 	}
 	target := strings.Trim(string(output), " \n\r")

 	dirlink := filepath.Join(tmpdir, "dirlink")
 	output, err = exec.Command("cmd", "/c", "mklink", "/J", dirlink, target).CombinedOutput()
 	if err != nil {
 		t.Fatalf("failed to run mklink %v %v: %v %q", dirlink, target, err, output)
 	}

 	got, err := filepath.EvalSymlinks(dirlink)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if want := vol + `\`; got != want {
 		t.Errorf(`EvalSymlinks(%q): got %q, want %q`, dirlink, got, want)
 	}

 	// Make sure we have sufficient privilege to run mklink command.
 	testenv.MustHaveSymlink(t)

 	file := filepath.Join(tmpdir, "file")
 	err = os.WriteFile(file, []byte(""), 0666)
 	if err != nil {
 		t.Fatal(err)
 	}

 	target += file[len(filepath.VolumeName(file)):]

 	filelink := filepath.Join(tmpdir, "filelink")
 	output, err = exec.Command("cmd", "/c", "mklink", filelink, target).CombinedOutput()
 	if err != nil {
 		t.Fatalf("failed to run mklink %v %v: %v %q", filelink, target, err, output)
 	}

 	got, err = filepath.EvalSymlinks(filelink)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if want := file; got != want {
 		t.Errorf(`EvalSymlinks(%q): got %q, want %q`, filelink, got, want)
 	}
 }
	// Copyright 2013 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package filepath_test

	import (
	"flag"
	"fmt"
	"internal/testenv"
	"io/fs"
	"os"
	"os/exec"
	"path/filepath"
	"reflect"
	"runtime/debug"
	"strings"
	"testing"
	)

	func TestWinSplitListTestsAreValid(t *testing.T) {
	comspec := os.Getenv("ComSpec")
	if comspec == "" {
	t.Fatal("%ComSpec% must be set")
	}

	for ti, tt := range winsplitlisttests {
	testWinSplitListTestIsValid(t, ti, tt, comspec)
	}
	}

	func testWinSplitListTestIsValid(t *testing.T, ti int, tt SplitListTest,
	comspec string) {

	const (
	cmdfile = `printdir.cmd`
	perm fs.FileMode = 0700
	)

	tmp := t.TempDir()
	for i, d := range tt.result {
	if d == "" {
	continue
	}
	if cd := filepath.Clean(d); filepath.VolumeName(cd) != "" \|\|
	cd[0] == '\\' \|\| cd == ".." \|\| (len(cd) >= 3 && cd[0:3] == `..\`) {
	t.Errorf("%d,%d: %#q refers outside working directory", ti, i, d)
	return
	}
	dd := filepath.Join(tmp, d)
	if _, err := os.Stat(dd); err == nil {
	t.Errorf("%d,%d: %#q already exists", ti, i, d)
	return
	}
	if err := os.MkdirAll(dd, perm); err != nil {
	t.Errorf("%d,%d: MkdirAll(%#q) failed: %v", ti, i, dd, err)
	return
	}
	fn, data := filepath.Join(dd, cmdfile), []byte("@echo "+d+"\r\n")
	if err := os.WriteFile(fn, data, perm); err != nil {
	t.Errorf("%d,%d: WriteFile(%#q) failed: %v", ti, i, fn, err)
	return
	}
	}

	// on some systems, SystemRoot is required for cmd to work
	systemRoot := os.Getenv("SystemRoot")

	for i, d := range tt.result {
	if d == "" {
	continue
	}
	exp := []byte(d + "\r\n")
	cmd := &exec.Cmd{
	Path: comspec,
	Args: []string{`/c`, cmdfile},
	Env: []string{`Path=` + systemRoot + "/System32;" + tt.list, `SystemRoot=` + systemRoot},
	Dir: tmp,
	}
	out, err := cmd.CombinedOutput()
	switch {
	case err != nil:
	t.Errorf("%d,%d: execution error %v\n%q", ti, i, err, out)
	return
	case !reflect.DeepEqual(out, exp):
	t.Errorf("%d,%d: expected %#q, got %#q", ti, i, exp, out)
	return
	default:
	// unshadow cmdfile in next directory
	err = os.Remove(filepath.Join(tmp, d, cmdfile))
	if err != nil {
	t.Fatalf("Remove test command failed: %v", err)
	}
	}
	}
	}

	func TestWindowsEvalSymlinks(t *testing.T) {
	testenv.MustHaveSymlink(t)

	tmpDir := tempDirCanonical(t)

	if len(tmpDir) < 3 {
	t.Fatalf("tmpDir path %q is too short", tmpDir)
	}
	if tmpDir[1] != ':' {
	t.Fatalf("tmpDir path %q must have drive letter in it", tmpDir)
	}
	test := EvalSymlinksTest{"test/linkabswin", tmpDir[:3]}

	// Create the symlink farm using relative paths.
	testdirs := append(EvalSymlinksTestDirs, test)
	for _, d := range testdirs {
	var err error
	path := simpleJoin(tmpDir, d.path)
	if d.dest == "" {
	err = os.Mkdir(path, 0755)
	} else {
	err = os.Symlink(d.dest, path)
	}
	if err != nil {
	t.Fatal(err)
	}
	}

	path := simpleJoin(tmpDir, test.path)

	testEvalSymlinks(t, path, test.dest)

	testEvalSymlinksAfterChdir(t, path, ".", test.dest)

	testEvalSymlinksAfterChdir(t,
	path,
	filepath.VolumeName(tmpDir)+".",
	test.dest)

	testEvalSymlinksAfterChdir(t,
	simpleJoin(tmpDir, "test"),
	simpleJoin("..", test.path),
	test.dest)

	testEvalSymlinksAfterChdir(t, tmpDir, test.path, test.dest)
	}

	// TestEvalSymlinksCanonicalNames verify that EvalSymlinks
	// returns "canonical" path names on windows.
	func TestEvalSymlinksCanonicalNames(t *testing.T) {
	ctmp := tempDirCanonical(t)
	dirs := []string{
	"test",
	"test/dir",
	"testing_long_dir",
	"TEST2",
	}

	for _, d := range dirs {
	dir := filepath.Join(ctmp, d)
	err := os.Mkdir(dir, 0755)
	if err != nil {
	t.Fatal(err)
	}
	cname, err := filepath.EvalSymlinks(dir)
	if err != nil {
	t.Errorf("EvalSymlinks(%q) error: %v", dir, err)
	continue
	}
	if dir != cname {
	t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", dir, cname, dir)
	continue
	}
	// test non-canonical names
	test := strings.ToUpper(dir)
	p, err := filepath.EvalSymlinks(test)
	if err != nil {
	t.Errorf("EvalSymlinks(%q) error: %v", test, err)
	continue
	}
	if p != cname {
	t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
	continue
	}
	// another test
	test = strings.ToLower(dir)
	p, err = filepath.EvalSymlinks(test)
	if err != nil {
	t.Errorf("EvalSymlinks(%q) error: %v", test, err)
	continue
	}
	if p != cname {
	t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
	continue
	}
	}
	}

	// checkVolume8dot3Setting runs "fsutil 8dot3name query c:" command
	// (where c: is vol parameter) to discover "8dot3 name creation state".
	// The state is combination of 2 flags. The global flag controls if it
	// is per volume or global setting:
	// 0 - Enable 8dot3 name creation on all volumes on the system
	// 1 - Disable 8dot3 name creation on all volumes on the system
	// 2 - Set 8dot3 name creation on a per volume basis
	// 3 - Disable 8dot3 name creation on all volumes except the system volume
	// If global flag is set to 2, then per-volume flag needs to be examined:
	// 0 - Enable 8dot3 name creation on this volume
	// 1 - Disable 8dot3 name creation on this volume
	// checkVolume8dot3Setting verifies that "8dot3 name creation" flags
	// are set to 2 and 0, if enabled parameter is true, or 2 and 1, if enabled
	// is false. Otherwise checkVolume8dot3Setting returns error.
	func checkVolume8dot3Setting(vol string, enabled bool) error {
	// It appears, on some systems "fsutil 8dot3name query ..." command always
	// exits with error. Ignore exit code, and look at fsutil output instead.
	out, _ := exec.Command("fsutil", "8dot3name", "query", vol).CombinedOutput()
	// Check that system has "Volume level setting" set.
	expected := "The registry state of NtfsDisable8dot3NameCreation is 2, the default (Volume level setting)"
	if !strings.Contains(string(out), expected) {
	// Windows 10 version of fsutil has different output message.
	expectedWindow10 := "The registry state is: 2 (Per volume setting - the default)"
	if !strings.Contains(string(out), expectedWindow10) {
	return fmt.Errorf("fsutil output should contain %q, but is %q", expected, string(out))
	}
	}
	// Now check the volume setting.
	expected = "Based on the above two settings, 8dot3 name creation is %s on %s"
	if enabled {
	expected = fmt.Sprintf(expected, "enabled", vol)
	} else {
	expected = fmt.Sprintf(expected, "disabled", vol)
	}
	if !strings.Contains(string(out), expected) {
	return fmt.Errorf("unexpected fsutil output: %q", string(out))
	}
	return nil
	}

	func setVolume8dot3Setting(vol string, enabled bool) error {
	cmd := []string{"fsutil", "8dot3name", "set", vol}
	if enabled {
	cmd = append(cmd, "0")
	} else {
	cmd = append(cmd, "1")
	}
	// It appears, on some systems "fsutil 8dot3name set ..." command always
	// exits with error. Ignore exit code, and look at fsutil output instead.
	out, _ := exec.Command(cmd[0], cmd[1:]...).CombinedOutput()
	if string(out) != "\r\nSuccessfully set 8dot3name behavior.\r\n" {
	// Windows 10 version of fsutil has different output message.
	expectedWindow10 := "Successfully %s 8dot3name generation on %s\r\n"
	if enabled {
	expectedWindow10 = fmt.Sprintf(expectedWindow10, "enabled", vol)
	} else {
	expectedWindow10 = fmt.Sprintf(expectedWindow10, "disabled", vol)
	}
	if string(out) != expectedWindow10 {
	return fmt.Errorf("%v command failed: %q", cmd, string(out))
	}
	}
	return nil
	}

	var runFSModifyTests = flag.Bool("run_fs_modify_tests", false, "run tests which modify filesystem parameters")

	// This test assumes registry state of NtfsDisable8dot3NameCreation is 2,
	// the default (Volume level setting).
	func TestEvalSymlinksCanonicalNamesWith8dot3Disabled(t *testing.T) {
	if !*runFSModifyTests {
	t.Skip("skipping test that modifies file system setting; enable with -run_fs_modify_tests")
	}
	tempVol := filepath.VolumeName(os.TempDir())
	if len(tempVol) != 2 {
	t.Fatalf("unexpected temp volume name %q", tempVol)
	}

	err := checkVolume8dot3Setting(tempVol, true)
	if err != nil {
	t.Fatal(err)
	}
	err = setVolume8dot3Setting(tempVol, false)
	if err != nil {
	t.Fatal(err)
	}
	defer func() {
	err := setVolume8dot3Setting(tempVol, true)
	if err != nil {
	t.Fatal(err)
	}
	err = checkVolume8dot3Setting(tempVol, true)
	if err != nil {
	t.Fatal(err)
	}
	}()
	err = checkVolume8dot3Setting(tempVol, false)
	if err != nil {
	t.Fatal(err)
	}
	TestEvalSymlinksCanonicalNames(t)
	}

	func TestToNorm(t *testing.T) {
	stubBase := func(path string) (string, error) {
	vol := filepath.VolumeName(path)
	path = path[len(vol):]

	if strings.Contains(path, "/") {
	return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
	}

	if path == "" \|\| path == "." \|\| path == `\` {
	return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
	}

	i := strings.LastIndexByte(path, filepath.Separator)
	if i == len(path)-1 { // trailing '\' is invalid
	return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
	}
	if i == -1 {
	return strings.ToUpper(path), nil
	}

	return strings.ToUpper(path[i+1:]), nil
	}

	// On this test, toNorm should be same as string.ToUpper(filepath.Clean(path)) except empty string.
	tests := []struct {
	arg string
	want string
	}{
	{"", ""},
	{".", "."},
	{"./foo/bar", `FOO\BAR`},
	{"/", `\`},
	{"/foo/bar", `\FOO\BAR`},
	{"/foo/bar/baz/qux", `\FOO\BAR\BAZ\QUX`},
	{"foo/bar", `FOO\BAR`},
	{"C:/foo/bar", `C:\FOO\BAR`},
	{"C:foo/bar", `C:FOO\BAR`},
	{"c:/foo/bar", `C:\FOO\BAR`},
	{"C:/foo/bar", `C:\FOO\BAR`},
	{"C:/foo/bar/", `C:\FOO\BAR`},
	{`C:\foo\bar`, `C:\FOO\BAR`},
	{`C:\foo/bar\`, `C:\FOO\BAR`},
	{"C:/ふー/バー", `C:\ふー\バー`},
	}

	for _, test := range tests {
	got, err := filepath.ToNorm(test.arg, stubBase)
	if err != nil {
	t.Errorf("toNorm(%s) failed: %v\n", test.arg, err)
	} else if got != test.want {
	t.Errorf("toNorm(%s) returns %s, but %s expected\n", test.arg, got, test.want)
	}
	}

	testPath := `{{tmp}}\test\foo\bar`

	testsDir := []struct {
	wd string
	arg string
	want string
	}{
	// test absolute paths
	{".", `{{tmp}}\test\foo\bar`, `{{tmp}}\test\foo\bar`},
	{".", `{{tmp}}\.\test/foo\bar`, `{{tmp}}\test\foo\bar`},
	{".", `{{tmp}}\test\..\test\foo\bar`, `{{tmp}}\test\foo\bar`},
	{".", `{{tmp}}\TEST\FOO\BAR`, `{{tmp}}\test\foo\bar`},

	// test relative paths begin with drive letter
	{`{{tmp}}\test`, `{{tmpvol}}.`, `{{tmpvol}}.`},
	{`{{tmp}}\test`, `{{tmpvol}}..`, `{{tmpvol}}..`},
	{`{{tmp}}\test`, `{{tmpvol}}foo\bar`, `{{tmpvol}}foo\bar`},
	{`{{tmp}}\test`, `{{tmpvol}}.\foo\bar`, `{{tmpvol}}foo\bar`},
	{`{{tmp}}\test`, `{{tmpvol}}foo\..\foo\bar`, `{{tmpvol}}foo\bar`},
	{`{{tmp}}\test`, `{{tmpvol}}FOO\BAR`, `{{tmpvol}}foo\bar`},

	// test relative paths begin with '\'
	{"{{tmp}}", `{{tmpnovol}}\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
	{"{{tmp}}", `{{tmpnovol}}\.\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
	{"{{tmp}}", `{{tmpnovol}}\test\..\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
	{"{{tmp}}", `{{tmpnovol}}\TEST\FOO\BAR`, `{{tmpnovol}}\test\foo\bar`},

	// test relative paths begin without '\'
	{`{{tmp}}\test`, ".", `.`},
	{`{{tmp}}\test`, "..", `..`},
	{`{{tmp}}\test`, `foo\bar`, `foo\bar`},
	{`{{tmp}}\test`, `.\foo\bar`, `foo\bar`},
	{`{{tmp}}\test`, `foo\..\foo\bar`, `foo\bar`},
	{`{{tmp}}\test`, `FOO\BAR`, `foo\bar`},

	// test UNC paths
	{".", `\\localhost\c$`, `\\localhost\c$`},
	}

	ctmp := tempDirCanonical(t)
	if err := os.MkdirAll(strings.ReplaceAll(testPath, "{{tmp}}", ctmp), 0777); err != nil {
	t.Fatal(err)
	}

	cwd, err := os.Getwd()
	if err != nil {
	t.Fatal(err)
	}
	defer func() {
	err := os.Chdir(cwd)
	if err != nil {
	t.Fatal(err)
	}
	}()

	tmpVol := filepath.VolumeName(ctmp)
	if len(tmpVol) != 2 {
	t.Fatalf("unexpected temp volume name %q", tmpVol)
	}

	tmpNoVol := ctmp[len(tmpVol):]

	replacer := strings.NewReplacer("{{tmp}}", ctmp, "{{tmpvol}}", tmpVol, "{{tmpnovol}}", tmpNoVol)

	for _, test := range testsDir {
	wd := replacer.Replace(test.wd)
	arg := replacer.Replace(test.arg)
	want := replacer.Replace(test.want)

	if test.wd == "." {
	err := os.Chdir(cwd)
	if err != nil {
	t.Error(err)

	continue
	}
	} else {
	err := os.Chdir(wd)
	if err != nil {
	t.Error(err)

	continue
	}
	}

	got, err := filepath.ToNorm(arg, filepath.NormBase)
	if err != nil {
	t.Errorf("toNorm(%s) failed: %v (wd=%s)\n", arg, err, wd)
	} else if got != want {
	t.Errorf("toNorm(%s) returns %s, but %s expected (wd=%s)\n", arg, got, want, wd)
	}
	}
	}

	func TestUNC(t *testing.T) {
	// Test that this doesn't go into an infinite recursion.
	// See golang.org/issue/15879.
	defer debug.SetMaxStack(debug.SetMaxStack(1e6))
	filepath.Glob(`\\?\c:\*`)
	}

	func testWalkMklink(t *testing.T, linktype string) {
	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
	if !strings.Contains(string(output), fmt.Sprintf(" /%s ", linktype)) {
	t.Skipf(`skipping test; mklink does not supports /%s parameter`, linktype)
	}
	testWalkSymlink(t, func(target, link string) error {
	output, err := exec.Command("cmd", "/c", "mklink", "/"+linktype, link, target).CombinedOutput()
	if err != nil {
	return fmt.Errorf(`"mklink /%s %v %v" command failed: %v\n%v`, linktype, link, target, err, string(output))
	}
	return nil
	})
	}

	func TestWalkDirectoryJunction(t *testing.T) {
	testenv.MustHaveSymlink(t)
	testWalkMklink(t, "J")
	}

	func TestWalkDirectorySymlink(t *testing.T) {
	testenv.MustHaveSymlink(t)
	testWalkMklink(t, "D")
	}

	func TestNTNamespaceSymlink(t *testing.T) {
	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
	if !strings.Contains(string(output), " /J ") {
	t.Skip("skipping test because mklink command does not support junctions")
	}

	tmpdir := tempDirCanonical(t)

	vol := filepath.VolumeName(tmpdir)
	output, err := exec.Command("cmd", "/c", "mountvol", vol, "/L").CombinedOutput()
	if err != nil {
	t.Fatalf("failed to run mountvol %v /L: %v %q", vol, err, output)
	}
	target := strings.Trim(string(output), " \n\r")

	dirlink := filepath.Join(tmpdir, "dirlink")
	output, err = exec.Command("cmd", "/c", "mklink", "/J", dirlink, target).CombinedOutput()
	if err != nil {
	t.Fatalf("failed to run mklink %v %v: %v %q", dirlink, target, err, output)
	}

	got, err := filepath.EvalSymlinks(dirlink)
	if err != nil {
	t.Fatal(err)
	}
	if want := vol + `\`; got != want {
	t.Errorf(`EvalSymlinks(%q): got %q, want %q`, dirlink, got, want)
	}

	// Make sure we have sufficient privilege to run mklink command.
	testenv.MustHaveSymlink(t)

	file := filepath.Join(tmpdir, "file")
	err = os.WriteFile(file, []byte(""), 0666)
	if err != nil {
	t.Fatal(err)
	}

	target += file[len(filepath.VolumeName(file)):]

	filelink := filepath.Join(tmpdir, "filelink")
	output, err = exec.Command("cmd", "/c", "mklink", filelink, target).CombinedOutput()
	if err != nil {
	t.Fatalf("failed to run mklink %v %v: %v %q", filelink, target, err, output)
	}

	got, err = filepath.EvalSymlinks(filelink)
	if err != nil {
	t.Fatal(err)
	}
	if want := file; got != want {
	t.Errorf(`EvalSymlinks(%q): got %q, want %q`, filelink, got, want)
	}
	}