Source file src/path/filepath/path_windows_test.go

Documentation: path/filepath

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package filepath_test
     6  
     7  import (
     8  	"flag"
     9  	"fmt"
    10  	"internal/testenv"
    11  	"io/ioutil"
    12  	"os"
    13  	"os/exec"
    14  	"path/filepath"
    15  	"reflect"
    16  	"runtime/debug"
    17  	"strings"
    18  	"testing"
    19  )
    20  
    21  func TestWinSplitListTestsAreValid(t *testing.T) {
    22  	comspec := os.Getenv("ComSpec")
    23  	if comspec == "" {
    24  		t.Fatal("%ComSpec% must be set")
    25  	}
    26  
    27  	for ti, tt := range winsplitlisttests {
    28  		testWinSplitListTestIsValid(t, ti, tt, comspec)
    29  	}
    30  }
    31  
    32  func testWinSplitListTestIsValid(t *testing.T, ti int, tt SplitListTest,
    33  	comspec string) {
    34  
    35  	const (
    36  		cmdfile             = `printdir.cmd`
    37  		perm    os.FileMode = 0700
    38  	)
    39  
    40  	tmp, err := ioutil.TempDir("", "testWinSplitListTestIsValid")
    41  	if err != nil {
    42  		t.Fatalf("TempDir failed: %v", err)
    43  	}
    44  	defer os.RemoveAll(tmp)
    45  
    46  	for i, d := range tt.result {
    47  		if d == "" {
    48  			continue
    49  		}
    50  		if cd := filepath.Clean(d); filepath.VolumeName(cd) != "" ||
    51  			cd[0] == '\\' || cd == ".." || (len(cd) >= 3 && cd[0:3] == `..\`) {
    52  			t.Errorf("%d,%d: %#q refers outside working directory", ti, i, d)
    53  			return
    54  		}
    55  		dd := filepath.Join(tmp, d)
    56  		if _, err := os.Stat(dd); err == nil {
    57  			t.Errorf("%d,%d: %#q already exists", ti, i, d)
    58  			return
    59  		}
    60  		if err = os.MkdirAll(dd, perm); err != nil {
    61  			t.Errorf("%d,%d: MkdirAll(%#q) failed: %v", ti, i, dd, err)
    62  			return
    63  		}
    64  		fn, data := filepath.Join(dd, cmdfile), []byte("@echo "+d+"\r\n")
    65  		if err = ioutil.WriteFile(fn, data, perm); err != nil {
    66  			t.Errorf("%d,%d: WriteFile(%#q) failed: %v", ti, i, fn, err)
    67  			return
    68  		}
    69  	}
    70  
    71  	// on some systems, SystemRoot is required for cmd to work
    72  	systemRoot := os.Getenv("SystemRoot")
    73  
    74  	for i, d := range tt.result {
    75  		if d == "" {
    76  			continue
    77  		}
    78  		exp := []byte(d + "\r\n")
    79  		cmd := &exec.Cmd{
    80  			Path: comspec,
    81  			Args: []string{`/c`, cmdfile},
    82  			Env:  []string{`Path=` + systemRoot + "/System32;" + tt.list, `SystemRoot=` + systemRoot},
    83  			Dir:  tmp,
    84  		}
    85  		out, err := cmd.CombinedOutput()
    86  		switch {
    87  		case err != nil:
    88  			t.Errorf("%d,%d: execution error %v\n%q", ti, i, err, out)
    89  			return
    90  		case !reflect.DeepEqual(out, exp):
    91  			t.Errorf("%d,%d: expected %#q, got %#q", ti, i, exp, out)
    92  			return
    93  		default:
    94  			// unshadow cmdfile in next directory
    95  			err = os.Remove(filepath.Join(tmp, d, cmdfile))
    96  			if err != nil {
    97  				t.Fatalf("Remove test command failed: %v", err)
    98  			}
    99  		}
   100  	}
   101  }
   102  
   103  func TestWindowsEvalSymlinks(t *testing.T) {
   104  	testenv.MustHaveSymlink(t)
   105  
   106  	tmpDir, err := ioutil.TempDir("", "TestWindowsEvalSymlinks")
   107  	if err != nil {
   108  		t.Fatal(err)
   109  	}
   110  	defer os.RemoveAll(tmpDir)
   111  
   112  	// /tmp may itself be a symlink! Avoid the confusion, although
   113  	// it means trusting the thing we're testing.
   114  	tmpDir, err = filepath.EvalSymlinks(tmpDir)
   115  	if err != nil {
   116  		t.Fatal(err)
   117  	}
   118  
   119  	if len(tmpDir) < 3 {
   120  		t.Fatalf("tmpDir path %q is too short", tmpDir)
   121  	}
   122  	if tmpDir[1] != ':' {
   123  		t.Fatalf("tmpDir path %q must have drive letter in it", tmpDir)
   124  	}
   125  	test := EvalSymlinksTest{"test/linkabswin", tmpDir[:3]}
   126  
   127  	// Create the symlink farm using relative paths.
   128  	testdirs := append(EvalSymlinksTestDirs, test)
   129  	for _, d := range testdirs {
   130  		var err error
   131  		path := simpleJoin(tmpDir, d.path)
   132  		if d.dest == "" {
   133  			err = os.Mkdir(path, 0755)
   134  		} else {
   135  			err = os.Symlink(d.dest, path)
   136  		}
   137  		if err != nil {
   138  			t.Fatal(err)
   139  		}
   140  	}
   141  
   142  	path := simpleJoin(tmpDir, test.path)
   143  
   144  	testEvalSymlinks(t, path, test.dest)
   145  
   146  	testEvalSymlinksAfterChdir(t, path, ".", test.dest)
   147  
   148  	testEvalSymlinksAfterChdir(t,
   149  		path,
   150  		filepath.VolumeName(tmpDir)+".",
   151  		test.dest)
   152  
   153  	testEvalSymlinksAfterChdir(t,
   154  		simpleJoin(tmpDir, "test"),
   155  		simpleJoin("..", test.path),
   156  		test.dest)
   157  
   158  	testEvalSymlinksAfterChdir(t, tmpDir, test.path, test.dest)
   159  }
   160  
   161  // TestEvalSymlinksCanonicalNames verify that EvalSymlinks
   162  // returns "canonical" path names on windows.
   163  func TestEvalSymlinksCanonicalNames(t *testing.T) {
   164  	tmp, err := ioutil.TempDir("", "evalsymlinkcanonical")
   165  	if err != nil {
   166  		t.Fatal("creating temp dir:", err)
   167  	}
   168  	defer os.RemoveAll(tmp)
   169  
   170  	// ioutil.TempDir might return "non-canonical" name.
   171  	cTmpName, err := filepath.EvalSymlinks(tmp)
   172  	if err != nil {
   173  		t.Errorf("EvalSymlinks(%q) error: %v", tmp, err)
   174  	}
   175  
   176  	dirs := []string{
   177  		"test",
   178  		"test/dir",
   179  		"testing_long_dir",
   180  		"TEST2",
   181  	}
   182  
   183  	for _, d := range dirs {
   184  		dir := filepath.Join(cTmpName, d)
   185  		err := os.Mkdir(dir, 0755)
   186  		if err != nil {
   187  			t.Fatal(err)
   188  		}
   189  		cname, err := filepath.EvalSymlinks(dir)
   190  		if err != nil {
   191  			t.Errorf("EvalSymlinks(%q) error: %v", dir, err)
   192  			continue
   193  		}
   194  		if dir != cname {
   195  			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", dir, cname, dir)
   196  			continue
   197  		}
   198  		// test non-canonical names
   199  		test := strings.ToUpper(dir)
   200  		p, err := filepath.EvalSymlinks(test)
   201  		if err != nil {
   202  			t.Errorf("EvalSymlinks(%q) error: %v", test, err)
   203  			continue
   204  		}
   205  		if p != cname {
   206  			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
   207  			continue
   208  		}
   209  		// another test
   210  		test = strings.ToLower(dir)
   211  		p, err = filepath.EvalSymlinks(test)
   212  		if err != nil {
   213  			t.Errorf("EvalSymlinks(%q) error: %v", test, err)
   214  			continue
   215  		}
   216  		if p != cname {
   217  			t.Errorf("EvalSymlinks(%q) returns %q, but should return %q", test, p, cname)
   218  			continue
   219  		}
   220  	}
   221  }
   222  
   223  // checkVolume8dot3Setting runs "fsutil 8dot3name query c:" command
   224  // (where c: is vol parameter) to discover "8dot3 name creation state".
   225  // The state is combination of 2 flags. The global flag controls if it
   226  // is per volume or global setting:
   227  //   0 - Enable 8dot3 name creation on all volumes on the system
   228  //   1 - Disable 8dot3 name creation on all volumes on the system
   229  //   2 - Set 8dot3 name creation on a per volume basis
   230  //   3 - Disable 8dot3 name creation on all volumes except the system volume
   231  // If global flag is set to 2, then per-volume flag needs to be examined:
   232  //   0 - Enable 8dot3 name creation on this volume
   233  //   1 - Disable 8dot3 name creation on this volume
   234  // checkVolume8dot3Setting verifies that "8dot3 name creation" flags
   235  // are set to 2 and 0, if enabled parameter is true, or 2 and 1, if enabled
   236  // is false. Otherwise checkVolume8dot3Setting returns error.
   237  func checkVolume8dot3Setting(vol string, enabled bool) error {
   238  	// It appears, on some systems "fsutil 8dot3name query ..." command always
   239  	// exits with error. Ignore exit code, and look at fsutil output instead.
   240  	out, _ := exec.Command("fsutil", "8dot3name", "query", vol).CombinedOutput()
   241  	// Check that system has "Volume level setting" set.
   242  	expected := "The registry state of NtfsDisable8dot3NameCreation is 2, the default (Volume level setting)"
   243  	if !strings.Contains(string(out), expected) {
   244  		// Windows 10 version of fsutil has different output message.
   245  		expectedWindow10 := "The registry state is: 2 (Per volume setting - the default)"
   246  		if !strings.Contains(string(out), expectedWindow10) {
   247  			return fmt.Errorf("fsutil output should contain %q, but is %q", expected, string(out))
   248  		}
   249  	}
   250  	// Now check the volume setting.
   251  	expected = "Based on the above two settings, 8dot3 name creation is %s on %s"
   252  	if enabled {
   253  		expected = fmt.Sprintf(expected, "enabled", vol)
   254  	} else {
   255  		expected = fmt.Sprintf(expected, "disabled", vol)
   256  	}
   257  	if !strings.Contains(string(out), expected) {
   258  		return fmt.Errorf("unexpected fsutil output: %q", string(out))
   259  	}
   260  	return nil
   261  }
   262  
   263  func setVolume8dot3Setting(vol string, enabled bool) error {
   264  	cmd := []string{"fsutil", "8dot3name", "set", vol}
   265  	if enabled {
   266  		cmd = append(cmd, "0")
   267  	} else {
   268  		cmd = append(cmd, "1")
   269  	}
   270  	// It appears, on some systems "fsutil 8dot3name set ..." command always
   271  	// exits with error. Ignore exit code, and look at fsutil output instead.
   272  	out, _ := exec.Command(cmd[0], cmd[1:]...).CombinedOutput()
   273  	if string(out) != "\r\nSuccessfully set 8dot3name behavior.\r\n" {
   274  		// Windows 10 version of fsutil has different output message.
   275  		expectedWindow10 := "Successfully %s 8dot3name generation on %s\r\n"
   276  		if enabled {
   277  			expectedWindow10 = fmt.Sprintf(expectedWindow10, "enabled", vol)
   278  		} else {
   279  			expectedWindow10 = fmt.Sprintf(expectedWindow10, "disabled", vol)
   280  		}
   281  		if string(out) != expectedWindow10 {
   282  			return fmt.Errorf("%v command failed: %q", cmd, string(out))
   283  		}
   284  	}
   285  	return nil
   286  }
   287  
   288  var runFSModifyTests = flag.Bool("run_fs_modify_tests", false, "run tests which modify filesystem parameters")
   289  
   290  // This test assumes registry state of NtfsDisable8dot3NameCreation is 2,
   291  // the default (Volume level setting).
   292  func TestEvalSymlinksCanonicalNamesWith8dot3Disabled(t *testing.T) {
   293  	if !*runFSModifyTests {
   294  		t.Skip("skipping test that modifies file system setting; enable with -run_fs_modify_tests")
   295  	}
   296  	tempVol := filepath.VolumeName(os.TempDir())
   297  	if len(tempVol) != 2 {
   298  		t.Fatalf("unexpected temp volume name %q", tempVol)
   299  	}
   300  
   301  	err := checkVolume8dot3Setting(tempVol, true)
   302  	if err != nil {
   303  		t.Fatal(err)
   304  	}
   305  	err = setVolume8dot3Setting(tempVol, false)
   306  	if err != nil {
   307  		t.Fatal(err)
   308  	}
   309  	defer func() {
   310  		err := setVolume8dot3Setting(tempVol, true)
   311  		if err != nil {
   312  			t.Fatal(err)
   313  		}
   314  		err = checkVolume8dot3Setting(tempVol, true)
   315  		if err != nil {
   316  			t.Fatal(err)
   317  		}
   318  	}()
   319  	err = checkVolume8dot3Setting(tempVol, false)
   320  	if err != nil {
   321  		t.Fatal(err)
   322  	}
   323  	TestEvalSymlinksCanonicalNames(t)
   324  }
   325  
   326  func TestToNorm(t *testing.T) {
   327  	stubBase := func(path string) (string, error) {
   328  		vol := filepath.VolumeName(path)
   329  		path = path[len(vol):]
   330  
   331  		if strings.Contains(path, "/") {
   332  			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
   333  		}
   334  
   335  		if path == "" || path == "." || path == `\` {
   336  			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
   337  		}
   338  
   339  		i := strings.LastIndexByte(path, filepath.Separator)
   340  		if i == len(path)-1 { // trailing '\' is invalid
   341  			return "", fmt.Errorf("invalid path is given to base: %s", vol+path)
   342  		}
   343  		if i == -1 {
   344  			return strings.ToUpper(path), nil
   345  		}
   346  
   347  		return strings.ToUpper(path[i+1:]), nil
   348  	}
   349  
   350  	// On this test, toNorm should be same as string.ToUpper(filepath.Clean(path)) except empty string.
   351  	tests := []struct {
   352  		arg  string
   353  		want string
   354  	}{
   355  		{"", ""},
   356  		{".", "."},
   357  		{"./foo/bar", `FOO\BAR`},
   358  		{"/", `\`},
   359  		{"/foo/bar", `\FOO\BAR`},
   360  		{"/foo/bar/baz/qux", `\FOO\BAR\BAZ\QUX`},
   361  		{"foo/bar", `FOO\BAR`},
   362  		{"C:/foo/bar", `C:\FOO\BAR`},
   363  		{"C:foo/bar", `C:FOO\BAR`},
   364  		{"c:/foo/bar", `C:\FOO\BAR`},
   365  		{"C:/foo/bar", `C:\FOO\BAR`},
   366  		{"C:/foo/bar/", `C:\FOO\BAR`},
   367  		{`C:\foo\bar`, `C:\FOO\BAR`},
   368  		{`C:\foo/bar\`, `C:\FOO\BAR`},
   369  		{"C:/ふー/バー", `C:\ふー\バー`},
   370  	}
   371  
   372  	for _, test := range tests {
   373  		got, err := filepath.ToNorm(test.arg, stubBase)
   374  		if err != nil {
   375  			t.Errorf("toNorm(%s) failed: %v\n", test.arg, err)
   376  		} else if got != test.want {
   377  			t.Errorf("toNorm(%s) returns %s, but %s expected\n", test.arg, got, test.want)
   378  		}
   379  	}
   380  
   381  	testPath := `{{tmp}}\test\foo\bar`
   382  
   383  	testsDir := []struct {
   384  		wd   string
   385  		arg  string
   386  		want string
   387  	}{
   388  		// test absolute paths
   389  		{".", `{{tmp}}\test\foo\bar`, `{{tmp}}\test\foo\bar`},
   390  		{".", `{{tmp}}\.\test/foo\bar`, `{{tmp}}\test\foo\bar`},
   391  		{".", `{{tmp}}\test\..\test\foo\bar`, `{{tmp}}\test\foo\bar`},
   392  		{".", `{{tmp}}\TEST\FOO\BAR`, `{{tmp}}\test\foo\bar`},
   393  
   394  		// test relative paths begin with drive letter
   395  		{`{{tmp}}\test`, `{{tmpvol}}.`, `{{tmpvol}}.`},
   396  		{`{{tmp}}\test`, `{{tmpvol}}..`, `{{tmpvol}}..`},
   397  		{`{{tmp}}\test`, `{{tmpvol}}foo\bar`, `{{tmpvol}}foo\bar`},
   398  		{`{{tmp}}\test`, `{{tmpvol}}.\foo\bar`, `{{tmpvol}}foo\bar`},
   399  		{`{{tmp}}\test`, `{{tmpvol}}foo\..\foo\bar`, `{{tmpvol}}foo\bar`},
   400  		{`{{tmp}}\test`, `{{tmpvol}}FOO\BAR`, `{{tmpvol}}foo\bar`},
   401  
   402  		// test relative paths begin with '\'
   403  		{"{{tmp}}", `{{tmpnovol}}\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
   404  		{"{{tmp}}", `{{tmpnovol}}\.\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
   405  		{"{{tmp}}", `{{tmpnovol}}\test\..\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
   406  		{"{{tmp}}", `{{tmpnovol}}\TEST\FOO\BAR`, `{{tmpnovol}}\test\foo\bar`},
   407  
   408  		// test relative paths begin without '\'
   409  		{`{{tmp}}\test`, ".", `.`},
   410  		{`{{tmp}}\test`, "..", `..`},
   411  		{`{{tmp}}\test`, `foo\bar`, `foo\bar`},
   412  		{`{{tmp}}\test`, `.\foo\bar`, `foo\bar`},
   413  		{`{{tmp}}\test`, `foo\..\foo\bar`, `foo\bar`},
   414  		{`{{tmp}}\test`, `FOO\BAR`, `foo\bar`},
   415  	}
   416  
   417  	tmp, err := ioutil.TempDir("", "testToNorm")
   418  	if err != nil {
   419  		t.Fatal(err)
   420  	}
   421  	defer func() {
   422  		err := os.RemoveAll(tmp)
   423  		if err != nil {
   424  			t.Fatal(err)
   425  		}
   426  	}()
   427  
   428  	// ioutil.TempDir might return "non-canonical" name.
   429  	ctmp, err := filepath.EvalSymlinks(tmp)
   430  	if err != nil {
   431  		t.Fatal(err)
   432  	}
   433  
   434  	err = os.MkdirAll(strings.ReplaceAll(testPath, "{{tmp}}", ctmp), 0777)
   435  	if err != nil {
   436  		t.Fatal(err)
   437  	}
   438  
   439  	cwd, err := os.Getwd()
   440  	if err != nil {
   441  		t.Fatal(err)
   442  	}
   443  	defer func() {
   444  		err := os.Chdir(cwd)
   445  		if err != nil {
   446  			t.Fatal(err)
   447  		}
   448  	}()
   449  
   450  	tmpVol := filepath.VolumeName(ctmp)
   451  	if len(tmpVol) != 2 {
   452  		t.Fatalf("unexpected temp volume name %q", tmpVol)
   453  	}
   454  
   455  	tmpNoVol := ctmp[len(tmpVol):]
   456  
   457  	replacer := strings.NewReplacer("{{tmp}}", ctmp, "{{tmpvol}}", tmpVol, "{{tmpnovol}}", tmpNoVol)
   458  
   459  	for _, test := range testsDir {
   460  		wd := replacer.Replace(test.wd)
   461  		arg := replacer.Replace(test.arg)
   462  		want := replacer.Replace(test.want)
   463  
   464  		if test.wd == "." {
   465  			err := os.Chdir(cwd)
   466  			if err != nil {
   467  				t.Error(err)
   468  
   469  				continue
   470  			}
   471  		} else {
   472  			err := os.Chdir(wd)
   473  			if err != nil {
   474  				t.Error(err)
   475  
   476  				continue
   477  			}
   478  		}
   479  
   480  		got, err := filepath.ToNorm(arg, filepath.NormBase)
   481  		if err != nil {
   482  			t.Errorf("toNorm(%s) failed: %v (wd=%s)\n", arg, err, wd)
   483  		} else if got != want {
   484  			t.Errorf("toNorm(%s) returns %s, but %s expected (wd=%s)\n", arg, got, want, wd)
   485  		}
   486  	}
   487  }
   488  
   489  func TestUNC(t *testing.T) {
   490  	// Test that this doesn't go into an infinite recursion.
   491  	// See golang.org/issue/15879.
   492  	defer debug.SetMaxStack(debug.SetMaxStack(1e6))
   493  	filepath.Glob(`\\?\c:\*`)
   494  }
   495  
   496  func testWalkMklink(t *testing.T, linktype string) {
   497  	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
   498  	if !strings.Contains(string(output), fmt.Sprintf(" /%s ", linktype)) {
   499  		t.Skipf(`skipping test; mklink does not supports /%s parameter`, linktype)
   500  	}
   501  	testWalkSymlink(t, func(target, link string) error {
   502  		output, err := exec.Command("cmd", "/c", "mklink", "/"+linktype, link, target).CombinedOutput()
   503  		if err != nil {
   504  			return fmt.Errorf(`"mklink /%s %v %v" command failed: %v\n%v`, linktype, link, target, err, string(output))
   505  		}
   506  		return nil
   507  	})
   508  }
   509  
   510  func TestWalkDirectoryJunction(t *testing.T) {
   511  	testenv.MustHaveSymlink(t)
   512  	testWalkMklink(t, "J")
   513  }
   514  
   515  func TestWalkDirectorySymlink(t *testing.T) {
   516  	testenv.MustHaveSymlink(t)
   517  	testWalkMklink(t, "D")
   518  }
   519  
   520  func TestNTNamespaceSymlink(t *testing.T) {
   521  	output, _ := exec.Command("cmd", "/c", "mklink", "/?").Output()
   522  	if !strings.Contains(string(output), " /J ") {
   523  		t.Skip("skipping test because mklink command does not support junctions")
   524  	}
   525  
   526  	tmpdir, err := ioutil.TempDir("", "TestNTNamespaceSymlink")
   527  	if err != nil {
   528  		t.Fatal(err)
   529  	}
   530  	defer os.RemoveAll(tmpdir)
   531  
   532  	// Make sure tmpdir is not a symlink, otherwise tests will fail.
   533  	tmpdir, err = filepath.EvalSymlinks(tmpdir)
   534  	if err != nil {
   535  		t.Fatal(err)
   536  	}
   537  
   538  	vol := filepath.VolumeName(tmpdir)
   539  	output, err = exec.Command("cmd", "/c", "mountvol", vol, "/L").CombinedOutput()
   540  	if err != nil {
   541  		t.Fatalf("failed to run mountvol %v /L: %v %q", vol, err, output)
   542  	}
   543  	target := strings.Trim(string(output), " \n\r")
   544  
   545  	dirlink := filepath.Join(tmpdir, "dirlink")
   546  	output, err = exec.Command("cmd", "/c", "mklink", "/J", dirlink, target).CombinedOutput()
   547  	if err != nil {
   548  		t.Fatalf("failed to run mklink %v %v: %v %q", dirlink, target, err, output)
   549  	}
   550  
   551  	got, err := filepath.EvalSymlinks(dirlink)
   552  	if err != nil {
   553  		t.Fatal(err)
   554  	}
   555  	if want := vol + `\`; got != want {
   556  		t.Errorf(`EvalSymlinks(%q): got %q, want %q`, dirlink, got, want)
   557  	}
   558  
   559  	// Make sure we have sufficient privilege to run mklink command.
   560  	testenv.MustHaveSymlink(t)
   561  
   562  	file := filepath.Join(tmpdir, "file")
   563  	err = ioutil.WriteFile(file, []byte(""), 0666)
   564  	if err != nil {
   565  		t.Fatal(err)
   566  	}
   567  
   568  	target += file[len(filepath.VolumeName(file)):]
   569  
   570  	filelink := filepath.Join(tmpdir, "filelink")
   571  	output, err = exec.Command("cmd", "/c", "mklink", filelink, target).CombinedOutput()
   572  	if err != nil {
   573  		t.Fatalf("failed to run mklink %v %v: %v %q", filelink, target, err, output)
   574  	}
   575  
   576  	got, err = filepath.EvalSymlinks(filelink)
   577  	if err != nil {
   578  		t.Fatal(err)
   579  	}
   580  	if want := file; got != want {
   581  		t.Errorf(`EvalSymlinks(%q): got %q, want %q`, filelink, got, want)
   582  	}
   583  }
   584  

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