Source file
src/os/os_test.go
1
2
3
4
5 package os_test
6
7 import (
8 "bytes"
9 "errors"
10 "flag"
11 "fmt"
12 "internal/testenv"
13 "io"
14 "io/fs"
15 "log"
16 . "os"
17 "os/exec"
18 "path/filepath"
19 "reflect"
20 "runtime"
21 "runtime/debug"
22 "sort"
23 "strings"
24 "sync"
25 "syscall"
26 "testing"
27 "testing/fstest"
28 "time"
29 )
30
31 func TestMain(m *testing.M) {
32 if Getenv("GO_OS_TEST_DRAIN_STDIN") == "1" {
33 Stdout.Close()
34 io.Copy(io.Discard, Stdin)
35 Exit(0)
36 }
37
38 log.SetFlags(log.LstdFlags | log.Lshortfile)
39
40 Exit(m.Run())
41 }
42
43 var dot = []string{
44 "dir_unix.go",
45 "env.go",
46 "error.go",
47 "file.go",
48 "os_test.go",
49 "types.go",
50 "stat_darwin.go",
51 "stat_linux.go",
52 }
53
54 type sysDir struct {
55 name string
56 files []string
57 }
58
59 var sysdir = func() *sysDir {
60 switch runtime.GOOS {
61 case "android":
62 return &sysDir{
63 "/system/lib",
64 []string{
65 "libmedia.so",
66 "libpowermanager.so",
67 },
68 }
69 case "ios":
70 wd, err := syscall.Getwd()
71 if err != nil {
72 wd = err.Error()
73 }
74 sd := &sysDir{
75 filepath.Join(wd, "..", ".."),
76 []string{
77 "ResourceRules.plist",
78 "Info.plist",
79 },
80 }
81 found := true
82 for _, f := range sd.files {
83 path := filepath.Join(sd.name, f)
84 if _, err := Stat(path); err != nil {
85 found = false
86 break
87 }
88 }
89 if found {
90 return sd
91 }
92
93
94 case "windows":
95 return &sysDir{
96 Getenv("SystemRoot") + "\\system32\\drivers\\etc",
97 []string{
98 "networks",
99 "protocol",
100 "services",
101 },
102 }
103 case "plan9":
104 return &sysDir{
105 "/lib/ndb",
106 []string{
107 "common",
108 "local",
109 },
110 }
111 case "wasip1":
112
113
114
115 return &sysDir{
116 runtime.GOROOT(),
117 []string{
118 "go.env",
119 "LICENSE",
120 "CONTRIBUTING.md",
121 },
122 }
123 }
124 return &sysDir{
125 "/etc",
126 []string{
127 "group",
128 "hosts",
129 "passwd",
130 },
131 }
132 }()
133
134 func size(name string, t *testing.T) int64 {
135 file, err := Open(name)
136 if err != nil {
137 t.Fatal("open failed:", err)
138 }
139 defer func() {
140 if err := file.Close(); err != nil {
141 t.Error(err)
142 }
143 }()
144 n, err := io.Copy(io.Discard, file)
145 if err != nil {
146 t.Fatal(err)
147 }
148 return n
149 }
150
151 func equal(name1, name2 string) (r bool) {
152 switch runtime.GOOS {
153 case "windows":
154 r = strings.EqualFold(name1, name2)
155 default:
156 r = name1 == name2
157 }
158 return
159 }
160
161
162 func localTmp() string {
163 switch runtime.GOOS {
164 case "android", "ios", "windows":
165 return TempDir()
166 }
167 return "/tmp"
168 }
169
170 func newFile(testName string, t *testing.T) (f *File) {
171 f, err := CreateTemp(localTmp(), "_Go_"+testName)
172 if err != nil {
173 t.Fatalf("TempFile %s: %s", testName, err)
174 }
175 return
176 }
177
178 func newDir(testName string, t *testing.T) (name string) {
179 name, err := MkdirTemp(localTmp(), "_Go_"+testName)
180 if err != nil {
181 t.Fatalf("TempDir %s: %s", testName, err)
182 }
183 return
184 }
185
186 var sfdir = sysdir.name
187 var sfname = sysdir.files[0]
188
189 func TestStat(t *testing.T) {
190 t.Parallel()
191
192 path := sfdir + "/" + sfname
193 dir, err := Stat(path)
194 if err != nil {
195 t.Fatal("stat failed:", err)
196 }
197 if !equal(sfname, dir.Name()) {
198 t.Error("name should be ", sfname, "; is", dir.Name())
199 }
200 filesize := size(path, t)
201 if dir.Size() != filesize {
202 t.Error("size should be", filesize, "; is", dir.Size())
203 }
204 }
205
206 func TestStatError(t *testing.T) {
207 defer chtmpdir(t)()
208
209 path := "no-such-file"
210
211 fi, err := Stat(path)
212 if err == nil {
213 t.Fatal("got nil, want error")
214 }
215 if fi != nil {
216 t.Errorf("got %v, want nil", fi)
217 }
218 if perr, ok := err.(*PathError); !ok {
219 t.Errorf("got %T, want %T", err, perr)
220 }
221
222 testenv.MustHaveSymlink(t)
223
224 link := "symlink"
225 err = Symlink(path, link)
226 if err != nil {
227 t.Fatal(err)
228 }
229
230 fi, err = Stat(link)
231 if err == nil {
232 t.Fatal("got nil, want error")
233 }
234 if fi != nil {
235 t.Errorf("got %v, want nil", fi)
236 }
237 if perr, ok := err.(*PathError); !ok {
238 t.Errorf("got %T, want %T", err, perr)
239 }
240 }
241
242 func TestStatSymlinkLoop(t *testing.T) {
243 testenv.MustHaveSymlink(t)
244
245 defer chtmpdir(t)()
246
247 err := Symlink("x", "y")
248 if err != nil {
249 t.Fatal(err)
250 }
251 defer Remove("y")
252
253 err = Symlink("y", "x")
254 if err != nil {
255 t.Fatal(err)
256 }
257 defer Remove("x")
258
259 _, err = Stat("x")
260 if _, ok := err.(*fs.PathError); !ok {
261 t.Errorf("expected *PathError, got %T: %v\n", err, err)
262 }
263 }
264
265 func TestFstat(t *testing.T) {
266 t.Parallel()
267
268 path := sfdir + "/" + sfname
269 file, err1 := Open(path)
270 if err1 != nil {
271 t.Fatal("open failed:", err1)
272 }
273 defer file.Close()
274 dir, err2 := file.Stat()
275 if err2 != nil {
276 t.Fatal("fstat failed:", err2)
277 }
278 if !equal(sfname, dir.Name()) {
279 t.Error("name should be ", sfname, "; is", dir.Name())
280 }
281 filesize := size(path, t)
282 if dir.Size() != filesize {
283 t.Error("size should be", filesize, "; is", dir.Size())
284 }
285 }
286
287 func TestLstat(t *testing.T) {
288 t.Parallel()
289
290 path := sfdir + "/" + sfname
291 dir, err := Lstat(path)
292 if err != nil {
293 t.Fatal("lstat failed:", err)
294 }
295 if !equal(sfname, dir.Name()) {
296 t.Error("name should be ", sfname, "; is", dir.Name())
297 }
298 if dir.Mode()&ModeSymlink == 0 {
299 filesize := size(path, t)
300 if dir.Size() != filesize {
301 t.Error("size should be", filesize, "; is", dir.Size())
302 }
303 }
304 }
305
306
307 func TestRead0(t *testing.T) {
308 t.Parallel()
309
310 path := sfdir + "/" + sfname
311 f, err := Open(path)
312 if err != nil {
313 t.Fatal("open failed:", err)
314 }
315 defer f.Close()
316
317 b := make([]byte, 0)
318 n, err := f.Read(b)
319 if n != 0 || err != nil {
320 t.Errorf("Read(0) = %d, %v, want 0, nil", n, err)
321 }
322 b = make([]byte, 100)
323 n, err = f.Read(b)
324 if n <= 0 || err != nil {
325 t.Errorf("Read(100) = %d, %v, want >0, nil", n, err)
326 }
327 }
328
329
330 func TestReadClosed(t *testing.T) {
331 t.Parallel()
332
333 path := sfdir + "/" + sfname
334 file, err := Open(path)
335 if err != nil {
336 t.Fatal("open failed:", err)
337 }
338 file.Close()
339
340 b := make([]byte, 100)
341 _, err = file.Read(b)
342
343 e, ok := err.(*PathError)
344 if !ok || e.Err != ErrClosed {
345 t.Fatalf("Read: got %T(%v), want %T(%v)", err, err, e, ErrClosed)
346 }
347 }
348
349 func testReaddirnames(dir string, contents []string) func(*testing.T) {
350 return func(t *testing.T) {
351 t.Parallel()
352
353 file, err := Open(dir)
354 if err != nil {
355 t.Fatalf("open %q failed: %v", dir, err)
356 }
357 defer file.Close()
358 s, err2 := file.Readdirnames(-1)
359 if err2 != nil {
360 t.Fatalf("Readdirnames %q failed: %v", dir, err2)
361 }
362 for _, m := range contents {
363 found := false
364 for _, n := range s {
365 if n == "." || n == ".." {
366 t.Errorf("got %q in directory", n)
367 }
368 if !equal(m, n) {
369 continue
370 }
371 if found {
372 t.Error("present twice:", m)
373 }
374 found = true
375 }
376 if !found {
377 t.Error("could not find", m)
378 }
379 }
380 if s == nil {
381 t.Error("Readdirnames returned nil instead of empty slice")
382 }
383 }
384 }
385
386 func testReaddir(dir string, contents []string) func(*testing.T) {
387 return func(t *testing.T) {
388 t.Parallel()
389
390 file, err := Open(dir)
391 if err != nil {
392 t.Fatalf("open %q failed: %v", dir, err)
393 }
394 defer file.Close()
395 s, err2 := file.Readdir(-1)
396 if err2 != nil {
397 t.Fatalf("Readdir %q failed: %v", dir, err2)
398 }
399 for _, m := range contents {
400 found := false
401 for _, n := range s {
402 if n.Name() == "." || n.Name() == ".." {
403 t.Errorf("got %q in directory", n.Name())
404 }
405 if !equal(m, n.Name()) {
406 continue
407 }
408 if found {
409 t.Error("present twice:", m)
410 }
411 found = true
412 }
413 if !found {
414 t.Error("could not find", m)
415 }
416 }
417 if s == nil {
418 t.Error("Readdir returned nil instead of empty slice")
419 }
420 }
421 }
422
423 func testReadDir(dir string, contents []string) func(*testing.T) {
424 return func(t *testing.T) {
425 t.Parallel()
426
427 file, err := Open(dir)
428 if err != nil {
429 t.Fatalf("open %q failed: %v", dir, err)
430 }
431 defer file.Close()
432 s, err2 := file.ReadDir(-1)
433 if err2 != nil {
434 t.Fatalf("ReadDir %q failed: %v", dir, err2)
435 }
436 for _, m := range contents {
437 found := false
438 for _, n := range s {
439 if n.Name() == "." || n.Name() == ".." {
440 t.Errorf("got %q in directory", n)
441 }
442 if !equal(m, n.Name()) {
443 continue
444 }
445 if found {
446 t.Error("present twice:", m)
447 }
448 found = true
449 lstat, err := Lstat(dir + "/" + m)
450 if err != nil {
451 t.Fatal(err)
452 }
453 if n.IsDir() != lstat.IsDir() {
454 t.Errorf("%s: IsDir=%v, want %v", m, n.IsDir(), lstat.IsDir())
455 }
456 if n.Type() != lstat.Mode().Type() {
457 t.Errorf("%s: IsDir=%v, want %v", m, n.Type(), lstat.Mode().Type())
458 }
459 info, err := n.Info()
460 if err != nil {
461 t.Errorf("%s: Info: %v", m, err)
462 continue
463 }
464 if !SameFile(info, lstat) {
465 t.Errorf("%s: Info: SameFile(info, lstat) = false", m)
466 }
467 }
468 if !found {
469 t.Error("could not find", m)
470 }
471 }
472 if s == nil {
473 t.Error("ReadDir returned nil instead of empty slice")
474 }
475 }
476 }
477
478 func TestFileReaddirnames(t *testing.T) {
479 t.Parallel()
480
481 t.Run(".", testReaddirnames(".", dot))
482 t.Run("sysdir", testReaddirnames(sysdir.name, sysdir.files))
483 t.Run("TempDir", testReaddirnames(t.TempDir(), nil))
484 }
485
486 func TestFileReaddir(t *testing.T) {
487 t.Parallel()
488
489 t.Run(".", testReaddir(".", dot))
490 t.Run("sysdir", testReaddir(sysdir.name, sysdir.files))
491 t.Run("TempDir", testReaddir(t.TempDir(), nil))
492 }
493
494 func TestFileReadDir(t *testing.T) {
495 t.Parallel()
496
497 t.Run(".", testReadDir(".", dot))
498 t.Run("sysdir", testReadDir(sysdir.name, sysdir.files))
499 t.Run("TempDir", testReadDir(t.TempDir(), nil))
500 }
501
502 func benchmarkReaddirname(path string, b *testing.B) {
503 var nentries int
504 for i := 0; i < b.N; i++ {
505 f, err := Open(path)
506 if err != nil {
507 b.Fatalf("open %q failed: %v", path, err)
508 }
509 ns, err := f.Readdirnames(-1)
510 f.Close()
511 if err != nil {
512 b.Fatalf("readdirnames %q failed: %v", path, err)
513 }
514 nentries = len(ns)
515 }
516 b.Logf("benchmarkReaddirname %q: %d entries", path, nentries)
517 }
518
519 func benchmarkReaddir(path string, b *testing.B) {
520 var nentries int
521 for i := 0; i < b.N; i++ {
522 f, err := Open(path)
523 if err != nil {
524 b.Fatalf("open %q failed: %v", path, err)
525 }
526 fs, err := f.Readdir(-1)
527 f.Close()
528 if err != nil {
529 b.Fatalf("readdir %q failed: %v", path, err)
530 }
531 nentries = len(fs)
532 }
533 b.Logf("benchmarkReaddir %q: %d entries", path, nentries)
534 }
535
536 func benchmarkReadDir(path string, b *testing.B) {
537 var nentries int
538 for i := 0; i < b.N; i++ {
539 f, err := Open(path)
540 if err != nil {
541 b.Fatalf("open %q failed: %v", path, err)
542 }
543 fs, err := f.ReadDir(-1)
544 f.Close()
545 if err != nil {
546 b.Fatalf("readdir %q failed: %v", path, err)
547 }
548 nentries = len(fs)
549 }
550 b.Logf("benchmarkReadDir %q: %d entries", path, nentries)
551 }
552
553 func BenchmarkReaddirname(b *testing.B) {
554 benchmarkReaddirname(".", b)
555 }
556
557 func BenchmarkReaddir(b *testing.B) {
558 benchmarkReaddir(".", b)
559 }
560
561 func BenchmarkReadDir(b *testing.B) {
562 benchmarkReadDir(".", b)
563 }
564
565 func benchmarkStat(b *testing.B, path string) {
566 b.ResetTimer()
567 for i := 0; i < b.N; i++ {
568 _, err := Stat(path)
569 if err != nil {
570 b.Fatalf("Stat(%q) failed: %v", path, err)
571 }
572 }
573 }
574
575 func benchmarkLstat(b *testing.B, path string) {
576 b.ResetTimer()
577 for i := 0; i < b.N; i++ {
578 _, err := Lstat(path)
579 if err != nil {
580 b.Fatalf("Lstat(%q) failed: %v", path, err)
581 }
582 }
583 }
584
585 func BenchmarkStatDot(b *testing.B) {
586 benchmarkStat(b, ".")
587 }
588
589 func BenchmarkStatFile(b *testing.B) {
590 benchmarkStat(b, filepath.Join(runtime.GOROOT(), "src/os/os_test.go"))
591 }
592
593 func BenchmarkStatDir(b *testing.B) {
594 benchmarkStat(b, filepath.Join(runtime.GOROOT(), "src/os"))
595 }
596
597 func BenchmarkLstatDot(b *testing.B) {
598 benchmarkLstat(b, ".")
599 }
600
601 func BenchmarkLstatFile(b *testing.B) {
602 benchmarkLstat(b, filepath.Join(runtime.GOROOT(), "src/os/os_test.go"))
603 }
604
605 func BenchmarkLstatDir(b *testing.B) {
606 benchmarkLstat(b, filepath.Join(runtime.GOROOT(), "src/os"))
607 }
608
609
610 func smallReaddirnames(file *File, length int, t *testing.T) []string {
611 names := make([]string, length)
612 count := 0
613 for {
614 d, err := file.Readdirnames(1)
615 if err == io.EOF {
616 break
617 }
618 if err != nil {
619 t.Fatalf("readdirnames %q failed: %v", file.Name(), err)
620 }
621 if len(d) == 0 {
622 t.Fatalf("readdirnames %q returned empty slice and no error", file.Name())
623 }
624 names[count] = d[0]
625 count++
626 }
627 return names[0:count]
628 }
629
630
631
632 func TestReaddirnamesOneAtATime(t *testing.T) {
633 t.Parallel()
634
635
636 dir := "/usr/bin"
637 switch runtime.GOOS {
638 case "android":
639 dir = "/system/bin"
640 case "ios", "wasip1":
641 wd, err := Getwd()
642 if err != nil {
643 t.Fatal(err)
644 }
645 dir = wd
646 case "plan9":
647 dir = "/bin"
648 case "windows":
649 dir = Getenv("SystemRoot") + "\\system32"
650 }
651 file, err := Open(dir)
652 if err != nil {
653 t.Fatalf("open %q failed: %v", dir, err)
654 }
655 defer file.Close()
656 all, err1 := file.Readdirnames(-1)
657 if err1 != nil {
658 t.Fatalf("readdirnames %q failed: %v", dir, err1)
659 }
660 file1, err2 := Open(dir)
661 if err2 != nil {
662 t.Fatalf("open %q failed: %v", dir, err2)
663 }
664 defer file1.Close()
665 small := smallReaddirnames(file1, len(all)+100, t)
666 if len(small) < len(all) {
667 t.Fatalf("len(small) is %d, less than %d", len(small), len(all))
668 }
669 for i, n := range all {
670 if small[i] != n {
671 t.Errorf("small read %q mismatch: %v", small[i], n)
672 }
673 }
674 }
675
676 func TestReaddirNValues(t *testing.T) {
677 if testing.Short() {
678 t.Skip("test.short; skipping")
679 }
680 t.Parallel()
681
682 dir := t.TempDir()
683 for i := 1; i <= 105; i++ {
684 f, err := Create(filepath.Join(dir, fmt.Sprintf("%d", i)))
685 if err != nil {
686 t.Fatalf("Create: %v", err)
687 }
688 f.Write([]byte(strings.Repeat("X", i)))
689 f.Close()
690 }
691
692 var d *File
693 openDir := func() {
694 var err error
695 d, err = Open(dir)
696 if err != nil {
697 t.Fatalf("Open directory: %v", err)
698 }
699 }
700
701 readdirExpect := func(n, want int, wantErr error) {
702 t.Helper()
703 fi, err := d.Readdir(n)
704 if err != wantErr {
705 t.Fatalf("Readdir of %d got error %v, want %v", n, err, wantErr)
706 }
707 if g, e := len(fi), want; g != e {
708 t.Errorf("Readdir of %d got %d files, want %d", n, g, e)
709 }
710 }
711
712 readDirExpect := func(n, want int, wantErr error) {
713 t.Helper()
714 de, err := d.ReadDir(n)
715 if err != wantErr {
716 t.Fatalf("ReadDir of %d got error %v, want %v", n, err, wantErr)
717 }
718 if g, e := len(de), want; g != e {
719 t.Errorf("ReadDir of %d got %d files, want %d", n, g, e)
720 }
721 }
722
723 readdirnamesExpect := func(n, want int, wantErr error) {
724 t.Helper()
725 fi, err := d.Readdirnames(n)
726 if err != wantErr {
727 t.Fatalf("Readdirnames of %d got error %v, want %v", n, err, wantErr)
728 }
729 if g, e := len(fi), want; g != e {
730 t.Errorf("Readdirnames of %d got %d files, want %d", n, g, e)
731 }
732 }
733
734 for _, fn := range []func(int, int, error){readdirExpect, readdirnamesExpect, readDirExpect} {
735
736 openDir()
737 fn(0, 105, nil)
738 fn(0, 0, nil)
739 d.Close()
740
741
742 openDir()
743 fn(-1, 105, nil)
744 fn(-2, 0, nil)
745 fn(0, 0, nil)
746 d.Close()
747
748
749 openDir()
750 fn(1, 1, nil)
751 fn(2, 2, nil)
752 fn(105, 102, nil)
753 fn(3, 0, io.EOF)
754 d.Close()
755 }
756 }
757
758 func touch(t *testing.T, name string) {
759 f, err := Create(name)
760 if err != nil {
761 t.Fatal(err)
762 }
763 if err := f.Close(); err != nil {
764 t.Fatal(err)
765 }
766 }
767
768 func TestReaddirStatFailures(t *testing.T) {
769 switch runtime.GOOS {
770 case "windows", "plan9":
771
772
773
774
775 t.Skipf("skipping test on %v", runtime.GOOS)
776 }
777
778 var xerr error
779 *LstatP = func(path string) (FileInfo, error) {
780 if xerr != nil && strings.HasSuffix(path, "x") {
781 return nil, xerr
782 }
783 return Lstat(path)
784 }
785 defer func() { *LstatP = Lstat }()
786
787 dir := t.TempDir()
788 touch(t, filepath.Join(dir, "good1"))
789 touch(t, filepath.Join(dir, "x"))
790 touch(t, filepath.Join(dir, "good2"))
791 readDir := func() ([]FileInfo, error) {
792 d, err := Open(dir)
793 if err != nil {
794 t.Fatal(err)
795 }
796 defer d.Close()
797 return d.Readdir(-1)
798 }
799 mustReadDir := func(testName string) []FileInfo {
800 fis, err := readDir()
801 if err != nil {
802 t.Fatalf("%s: Readdir: %v", testName, err)
803 }
804 return fis
805 }
806 names := func(fis []FileInfo) []string {
807 s := make([]string, len(fis))
808 for i, fi := range fis {
809 s[i] = fi.Name()
810 }
811 sort.Strings(s)
812 return s
813 }
814
815 if got, want := names(mustReadDir("initial readdir")),
816 []string{"good1", "good2", "x"}; !reflect.DeepEqual(got, want) {
817 t.Errorf("initial readdir got %q; want %q", got, want)
818 }
819
820 xerr = ErrNotExist
821 if got, want := names(mustReadDir("with x disappearing")),
822 []string{"good1", "good2"}; !reflect.DeepEqual(got, want) {
823 t.Errorf("with x disappearing, got %q; want %q", got, want)
824 }
825
826 xerr = errors.New("some real error")
827 if _, err := readDir(); err != xerr {
828 t.Errorf("with a non-ErrNotExist error, got error %v; want %v", err, xerr)
829 }
830 }
831
832
833 func TestReaddirOfFile(t *testing.T) {
834 t.Parallel()
835
836 f, err := CreateTemp(t.TempDir(), "_Go_ReaddirOfFile")
837 if err != nil {
838 t.Fatal(err)
839 }
840 f.Write([]byte("foo"))
841 f.Close()
842 reg, err := Open(f.Name())
843 if err != nil {
844 t.Fatal(err)
845 }
846 defer reg.Close()
847
848 names, err := reg.Readdirnames(-1)
849 if err == nil {
850 t.Error("Readdirnames succeeded; want non-nil error")
851 }
852 var pe *PathError
853 if !errors.As(err, &pe) || pe.Path != f.Name() {
854 t.Errorf("Readdirnames returned %q; want a PathError with path %q", err, f.Name())
855 }
856 if len(names) > 0 {
857 t.Errorf("unexpected dir names in regular file: %q", names)
858 }
859 }
860
861 func TestHardLink(t *testing.T) {
862 testenv.MustHaveLink(t)
863
864 defer chtmpdir(t)()
865 from, to := "hardlinktestfrom", "hardlinktestto"
866 file, err := Create(to)
867 if err != nil {
868 t.Fatalf("open %q failed: %v", to, err)
869 }
870 if err = file.Close(); err != nil {
871 t.Errorf("close %q failed: %v", to, err)
872 }
873 err = Link(to, from)
874 if err != nil {
875 t.Fatalf("link %q, %q failed: %v", to, from, err)
876 }
877
878 none := "hardlinktestnone"
879 err = Link(none, none)
880
881 if lerr, ok := err.(*LinkError); !ok || lerr.Error() == "" {
882 t.Errorf("link %q, %q failed to return a valid error", none, none)
883 }
884
885 tostat, err := Stat(to)
886 if err != nil {
887 t.Fatalf("stat %q failed: %v", to, err)
888 }
889 fromstat, err := Stat(from)
890 if err != nil {
891 t.Fatalf("stat %q failed: %v", from, err)
892 }
893 if !SameFile(tostat, fromstat) {
894 t.Errorf("link %q, %q did not create hard link", to, from)
895 }
896
897 err = Link(to, from)
898 switch err := err.(type) {
899 case *LinkError:
900 if err.Op != "link" {
901 t.Errorf("Link(%q, %q) err.Op = %q; want %q", to, from, err.Op, "link")
902 }
903 if err.Old != to {
904 t.Errorf("Link(%q, %q) err.Old = %q; want %q", to, from, err.Old, to)
905 }
906 if err.New != from {
907 t.Errorf("Link(%q, %q) err.New = %q; want %q", to, from, err.New, from)
908 }
909 if !IsExist(err.Err) {
910 t.Errorf("Link(%q, %q) err.Err = %q; want %q", to, from, err.Err, "file exists error")
911 }
912 case nil:
913 t.Errorf("link %q, %q: expected error, got nil", from, to)
914 default:
915 t.Errorf("link %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
916 }
917 }
918
919
920
921 func chtmpdir(t *testing.T) func() {
922 oldwd, err := Getwd()
923 if err != nil {
924 t.Fatalf("chtmpdir: %v", err)
925 }
926 d, err := MkdirTemp("", "test")
927 if err != nil {
928 t.Fatalf("chtmpdir: %v", err)
929 }
930 if err := Chdir(d); err != nil {
931 t.Fatalf("chtmpdir: %v", err)
932 }
933 return func() {
934 if err := Chdir(oldwd); err != nil {
935 t.Fatalf("chtmpdir: %v", err)
936 }
937 RemoveAll(d)
938 }
939 }
940
941 func TestSymlink(t *testing.T) {
942 testenv.MustHaveSymlink(t)
943
944 defer chtmpdir(t)()
945 from, to := "symlinktestfrom", "symlinktestto"
946 file, err := Create(to)
947 if err != nil {
948 t.Fatalf("Create(%q) failed: %v", to, err)
949 }
950 if err = file.Close(); err != nil {
951 t.Errorf("Close(%q) failed: %v", to, err)
952 }
953 err = Symlink(to, from)
954 if err != nil {
955 t.Fatalf("Symlink(%q, %q) failed: %v", to, from, err)
956 }
957 tostat, err := Lstat(to)
958 if err != nil {
959 t.Fatalf("Lstat(%q) failed: %v", to, err)
960 }
961 if tostat.Mode()&ModeSymlink != 0 {
962 t.Fatalf("Lstat(%q).Mode()&ModeSymlink = %v, want 0", to, tostat.Mode()&ModeSymlink)
963 }
964 fromstat, err := Stat(from)
965 if err != nil {
966 t.Fatalf("Stat(%q) failed: %v", from, err)
967 }
968 if !SameFile(tostat, fromstat) {
969 t.Errorf("Symlink(%q, %q) did not create symlink", to, from)
970 }
971 fromstat, err = Lstat(from)
972 if err != nil {
973 t.Fatalf("Lstat(%q) failed: %v", from, err)
974 }
975 if fromstat.Mode()&ModeSymlink == 0 {
976 t.Fatalf("Lstat(%q).Mode()&ModeSymlink = 0, want %v", from, ModeSymlink)
977 }
978 fromstat, err = Stat(from)
979 if err != nil {
980 t.Fatalf("Stat(%q) failed: %v", from, err)
981 }
982 if fromstat.Name() != from {
983 t.Errorf("Stat(%q).Name() = %q, want %q", from, fromstat.Name(), from)
984 }
985 if fromstat.Mode()&ModeSymlink != 0 {
986 t.Fatalf("Stat(%q).Mode()&ModeSymlink = %v, want 0", from, fromstat.Mode()&ModeSymlink)
987 }
988 s, err := Readlink(from)
989 if err != nil {
990 t.Fatalf("Readlink(%q) failed: %v", from, err)
991 }
992 if s != to {
993 t.Fatalf("Readlink(%q) = %q, want %q", from, s, to)
994 }
995 file, err = Open(from)
996 if err != nil {
997 t.Fatalf("Open(%q) failed: %v", from, err)
998 }
999 file.Close()
1000 }
1001
1002 func TestLongSymlink(t *testing.T) {
1003 testenv.MustHaveSymlink(t)
1004
1005 defer chtmpdir(t)()
1006 s := "0123456789abcdef"
1007
1008 s = s + s + s + s + s + s + s + s + s + s + s + s + s + s + s
1009 from := "longsymlinktestfrom"
1010 err := Symlink(s, from)
1011 if err != nil {
1012 t.Fatalf("symlink %q, %q failed: %v", s, from, err)
1013 }
1014 r, err := Readlink(from)
1015 if err != nil {
1016 t.Fatalf("readlink %q failed: %v", from, err)
1017 }
1018 if r != s {
1019 t.Fatalf("after symlink %q != %q", r, s)
1020 }
1021 }
1022
1023 func TestRename(t *testing.T) {
1024 defer chtmpdir(t)()
1025 from, to := "renamefrom", "renameto"
1026
1027 file, err := Create(from)
1028 if err != nil {
1029 t.Fatalf("open %q failed: %v", from, err)
1030 }
1031 if err = file.Close(); err != nil {
1032 t.Errorf("close %q failed: %v", from, err)
1033 }
1034 err = Rename(from, to)
1035 if err != nil {
1036 t.Fatalf("rename %q, %q failed: %v", to, from, err)
1037 }
1038 _, err = Stat(to)
1039 if err != nil {
1040 t.Errorf("stat %q failed: %v", to, err)
1041 }
1042 }
1043
1044 func TestRenameOverwriteDest(t *testing.T) {
1045 defer chtmpdir(t)()
1046 from, to := "renamefrom", "renameto"
1047
1048 toData := []byte("to")
1049 fromData := []byte("from")
1050
1051 err := WriteFile(to, toData, 0777)
1052 if err != nil {
1053 t.Fatalf("write file %q failed: %v", to, err)
1054 }
1055
1056 err = WriteFile(from, fromData, 0777)
1057 if err != nil {
1058 t.Fatalf("write file %q failed: %v", from, err)
1059 }
1060 err = Rename(from, to)
1061 if err != nil {
1062 t.Fatalf("rename %q, %q failed: %v", to, from, err)
1063 }
1064
1065 _, err = Stat(from)
1066 if err == nil {
1067 t.Errorf("from file %q still exists", from)
1068 }
1069 if err != nil && !IsNotExist(err) {
1070 t.Fatalf("stat from: %v", err)
1071 }
1072 toFi, err := Stat(to)
1073 if err != nil {
1074 t.Fatalf("stat %q failed: %v", to, err)
1075 }
1076 if toFi.Size() != int64(len(fromData)) {
1077 t.Errorf(`"to" size = %d; want %d (old "from" size)`, toFi.Size(), len(fromData))
1078 }
1079 }
1080
1081 func TestRenameFailed(t *testing.T) {
1082 defer chtmpdir(t)()
1083 from, to := "renamefrom", "renameto"
1084
1085 err := Rename(from, to)
1086 switch err := err.(type) {
1087 case *LinkError:
1088 if err.Op != "rename" {
1089 t.Errorf("rename %q, %q: err.Op: want %q, got %q", from, to, "rename", err.Op)
1090 }
1091 if err.Old != from {
1092 t.Errorf("rename %q, %q: err.Old: want %q, got %q", from, to, from, err.Old)
1093 }
1094 if err.New != to {
1095 t.Errorf("rename %q, %q: err.New: want %q, got %q", from, to, to, err.New)
1096 }
1097 case nil:
1098 t.Errorf("rename %q, %q: expected error, got nil", from, to)
1099 default:
1100 t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
1101 }
1102 }
1103
1104 func TestRenameNotExisting(t *testing.T) {
1105 defer chtmpdir(t)()
1106 from, to := "doesnt-exist", "dest"
1107
1108 Mkdir(to, 0777)
1109
1110 if err := Rename(from, to); !IsNotExist(err) {
1111 t.Errorf("Rename(%q, %q) = %v; want an IsNotExist error", from, to, err)
1112 }
1113 }
1114
1115 func TestRenameToDirFailed(t *testing.T) {
1116 defer chtmpdir(t)()
1117 from, to := "renamefrom", "renameto"
1118
1119 Mkdir(from, 0777)
1120 Mkdir(to, 0777)
1121
1122 err := Rename(from, to)
1123 switch err := err.(type) {
1124 case *LinkError:
1125 if err.Op != "rename" {
1126 t.Errorf("rename %q, %q: err.Op: want %q, got %q", from, to, "rename", err.Op)
1127 }
1128 if err.Old != from {
1129 t.Errorf("rename %q, %q: err.Old: want %q, got %q", from, to, from, err.Old)
1130 }
1131 if err.New != to {
1132 t.Errorf("rename %q, %q: err.New: want %q, got %q", from, to, to, err.New)
1133 }
1134 case nil:
1135 t.Errorf("rename %q, %q: expected error, got nil", from, to)
1136 default:
1137 t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
1138 }
1139 }
1140
1141 func TestRenameCaseDifference(pt *testing.T) {
1142 from, to := "renameFROM", "RENAMEfrom"
1143 tests := []struct {
1144 name string
1145 create func() error
1146 }{
1147 {"dir", func() error {
1148 return Mkdir(from, 0777)
1149 }},
1150 {"file", func() error {
1151 fd, err := Create(from)
1152 if err != nil {
1153 return err
1154 }
1155 return fd.Close()
1156 }},
1157 }
1158
1159 for _, test := range tests {
1160 pt.Run(test.name, func(t *testing.T) {
1161 defer chtmpdir(t)()
1162
1163 if err := test.create(); err != nil {
1164 t.Fatalf("failed to create test file: %s", err)
1165 }
1166
1167 if _, err := Stat(to); err != nil {
1168
1169 if IsNotExist(err) {
1170 t.Skipf("case sensitive filesystem")
1171 }
1172 t.Fatalf("stat %q, got: %q", to, err)
1173 }
1174
1175 if err := Rename(from, to); err != nil {
1176 t.Fatalf("unexpected error when renaming from %q to %q: %s", from, to, err)
1177 }
1178
1179 fd, err := Open(".")
1180 if err != nil {
1181 t.Fatalf("Open .: %s", err)
1182 }
1183
1184
1185
1186 dirNames, err := fd.Readdirnames(-1)
1187 fd.Close()
1188 if err != nil {
1189 t.Fatalf("readdirnames: %s", err)
1190 }
1191
1192 if dirNamesLen := len(dirNames); dirNamesLen != 1 {
1193 t.Fatalf("unexpected dirNames len, got %q, want %q", dirNamesLen, 1)
1194 }
1195
1196 if dirNames[0] != to {
1197 t.Errorf("unexpected name, got %q, want %q", dirNames[0], to)
1198 }
1199 })
1200 }
1201 }
1202
1203 func testStartProcess(dir, cmd string, args []string, expect string) func(t *testing.T) {
1204 return func(t *testing.T) {
1205 t.Parallel()
1206
1207 r, w, err := Pipe()
1208 if err != nil {
1209 t.Fatalf("Pipe: %v", err)
1210 }
1211 defer r.Close()
1212 attr := &ProcAttr{Dir: dir, Files: []*File{nil, w, Stderr}}
1213 p, err := StartProcess(cmd, args, attr)
1214 if err != nil {
1215 t.Fatalf("StartProcess: %v", err)
1216 }
1217 w.Close()
1218
1219 var b strings.Builder
1220 io.Copy(&b, r)
1221 output := b.String()
1222
1223 fi1, _ := Stat(strings.TrimSpace(output))
1224 fi2, _ := Stat(expect)
1225 if !SameFile(fi1, fi2) {
1226 t.Errorf("exec %q returned %q wanted %q",
1227 strings.Join(append([]string{cmd}, args...), " "), output, expect)
1228 }
1229 p.Wait()
1230 }
1231 }
1232
1233 func TestStartProcess(t *testing.T) {
1234 testenv.MustHaveExec(t)
1235 t.Parallel()
1236
1237 var dir, cmd string
1238 var args []string
1239 switch runtime.GOOS {
1240 case "android":
1241 t.Skip("android doesn't have /bin/pwd")
1242 case "windows":
1243 cmd = Getenv("COMSPEC")
1244 dir = Getenv("SystemRoot")
1245 args = []string{"/c", "cd"}
1246 default:
1247 var err error
1248 cmd, err = exec.LookPath("pwd")
1249 if err != nil {
1250 t.Fatalf("Can't find pwd: %v", err)
1251 }
1252 dir = "/"
1253 args = []string{}
1254 t.Logf("Testing with %v", cmd)
1255 }
1256 cmddir, cmdbase := filepath.Split(cmd)
1257 args = append([]string{cmdbase}, args...)
1258 t.Run("absolute", testStartProcess(dir, cmd, args, dir))
1259 t.Run("relative", testStartProcess(cmddir, cmdbase, args, cmddir))
1260 }
1261
1262 func checkMode(t *testing.T, path string, mode FileMode) {
1263 dir, err := Stat(path)
1264 if err != nil {
1265 t.Fatalf("Stat %q (looking for mode %#o): %s", path, mode, err)
1266 }
1267 if dir.Mode()&ModePerm != mode {
1268 t.Errorf("Stat %q: mode %#o want %#o", path, dir.Mode(), mode)
1269 }
1270 }
1271
1272 func TestChmod(t *testing.T) {
1273
1274 if runtime.GOOS == "wasip1" {
1275 t.Skip("Chmod is not supported on " + runtime.GOOS)
1276 }
1277 t.Parallel()
1278
1279 f := newFile("TestChmod", t)
1280 defer Remove(f.Name())
1281 defer f.Close()
1282
1283
1284 fm := FileMode(0456)
1285 if runtime.GOOS == "windows" {
1286 fm = FileMode(0444)
1287 }
1288 if err := Chmod(f.Name(), fm); err != nil {
1289 t.Fatalf("chmod %s %#o: %s", f.Name(), fm, err)
1290 }
1291 checkMode(t, f.Name(), fm)
1292
1293 fm = FileMode(0123)
1294 if runtime.GOOS == "windows" {
1295 fm = FileMode(0666)
1296 }
1297 if err := f.Chmod(fm); err != nil {
1298 t.Fatalf("chmod %s %#o: %s", f.Name(), fm, err)
1299 }
1300 checkMode(t, f.Name(), fm)
1301 }
1302
1303 func checkSize(t *testing.T, f *File, size int64) {
1304 t.Helper()
1305 dir, err := f.Stat()
1306 if err != nil {
1307 t.Fatalf("Stat %q (looking for size %d): %s", f.Name(), size, err)
1308 }
1309 if dir.Size() != size {
1310 t.Errorf("Stat %q: size %d want %d", f.Name(), dir.Size(), size)
1311 }
1312 }
1313
1314 func TestFTruncate(t *testing.T) {
1315 t.Parallel()
1316
1317 f := newFile("TestFTruncate", t)
1318 defer Remove(f.Name())
1319 defer f.Close()
1320
1321 checkSize(t, f, 0)
1322 f.Write([]byte("hello, world\n"))
1323 checkSize(t, f, 13)
1324 f.Truncate(10)
1325 checkSize(t, f, 10)
1326 f.Truncate(1024)
1327 checkSize(t, f, 1024)
1328 f.Truncate(0)
1329 checkSize(t, f, 0)
1330 _, err := f.Write([]byte("surprise!"))
1331 if err == nil {
1332 checkSize(t, f, 13+9)
1333 }
1334 }
1335
1336 func TestTruncate(t *testing.T) {
1337 t.Parallel()
1338
1339 f := newFile("TestTruncate", t)
1340 defer Remove(f.Name())
1341 defer f.Close()
1342
1343 checkSize(t, f, 0)
1344 f.Write([]byte("hello, world\n"))
1345 checkSize(t, f, 13)
1346 Truncate(f.Name(), 10)
1347 checkSize(t, f, 10)
1348 Truncate(f.Name(), 1024)
1349 checkSize(t, f, 1024)
1350 Truncate(f.Name(), 0)
1351 checkSize(t, f, 0)
1352 _, err := f.Write([]byte("surprise!"))
1353 if err == nil {
1354 checkSize(t, f, 13+9)
1355 }
1356 }
1357
1358 func TestTruncateNonexistentFile(t *testing.T) {
1359 t.Parallel()
1360
1361 assertPathError := func(t testing.TB, path string, err error) {
1362 t.Helper()
1363 if pe, ok := err.(*PathError); !ok || !IsNotExist(err) || pe.Path != path {
1364 t.Errorf("got error: %v\nwant an ErrNotExist PathError with path %q", err, path)
1365 }
1366 }
1367
1368 path := filepath.Join(t.TempDir(), "nonexistent")
1369
1370 err := Truncate(path, 1)
1371 assertPathError(t, path, err)
1372
1373
1374 _, err = Stat(path)
1375 assertPathError(t, path, err)
1376 }
1377
1378
1379
1380
1381
1382 func TestChtimes(t *testing.T) {
1383 t.Parallel()
1384
1385 f := newFile("TestChtimes", t)
1386 defer Remove(f.Name())
1387
1388 f.Write([]byte("hello, world\n"))
1389 f.Close()
1390
1391 testChtimes(t, f.Name())
1392 }
1393
1394 func TestChtimesWithZeroTimes(t *testing.T) {
1395 file := newFile("chtimes-with-zero", t)
1396 _, err := file.Write([]byte("hello, world\n"))
1397 if err != nil {
1398 t.Fatalf("Write: %s", err)
1399 }
1400 fName := file.Name()
1401 defer Remove(file.Name())
1402 err = file.Close()
1403 if err != nil {
1404 t.Errorf("%v", err)
1405 }
1406 fs, err := Stat(fName)
1407 if err != nil {
1408 t.Fatal(err)
1409 }
1410 startAtime := Atime(fs)
1411 startMtime := fs.ModTime()
1412 switch runtime.GOOS {
1413 case "js":
1414 startAtime = startAtime.Truncate(time.Second)
1415 startMtime = startMtime.Truncate(time.Second)
1416 }
1417 at0 := startAtime
1418 mt0 := startMtime
1419 t0 := startMtime.Truncate(time.Second).Add(1 * time.Hour)
1420
1421 tests := []struct {
1422 aTime time.Time
1423 mTime time.Time
1424 wantATime time.Time
1425 wantMTime time.Time
1426 }{
1427 {
1428 aTime: time.Time{},
1429 mTime: time.Time{},
1430 wantATime: startAtime,
1431 wantMTime: startMtime,
1432 },
1433 {
1434 aTime: t0.Add(200 * time.Second),
1435 mTime: time.Time{},
1436 wantATime: t0.Add(200 * time.Second),
1437 wantMTime: startMtime,
1438 },
1439 {
1440 aTime: time.Time{},
1441 mTime: t0.Add(100 * time.Second),
1442 wantATime: t0.Add(200 * time.Second),
1443 wantMTime: t0.Add(100 * time.Second),
1444 },
1445 {
1446 aTime: t0.Add(300 * time.Second),
1447 mTime: t0.Add(100 * time.Second),
1448 wantATime: t0.Add(300 * time.Second),
1449 wantMTime: t0.Add(100 * time.Second),
1450 },
1451 }
1452
1453 for _, tt := range tests {
1454
1455 if err := Chtimes(fName, tt.aTime, tt.mTime); err != nil {
1456 t.Error(err)
1457 }
1458
1459
1460 fs, err = Stat(fName)
1461 if err != nil {
1462 t.Error(err)
1463 }
1464 at0 = Atime(fs)
1465 mt0 = fs.ModTime()
1466
1467 if got, want := at0, tt.wantATime; !got.Equal(want) {
1468 errormsg := fmt.Sprintf("AccessTime mismatch with values ATime:%q-MTime:%q\ngot: %q\nwant: %q", tt.aTime, tt.mTime, got, want)
1469 switch runtime.GOOS {
1470 case "plan9":
1471
1472
1473
1474
1475 case "windows":
1476 t.Error(errormsg)
1477 default:
1478 if got, want := at0, tt.wantATime; !got.Equal(want) {
1479 mounts, err := ReadFile("/bin/mounts")
1480 if err != nil {
1481 mounts, err = ReadFile("/etc/mtab")
1482 }
1483 if strings.Contains(string(mounts), "noatime") {
1484 t.Log(errormsg)
1485 t.Log("A filesystem is mounted with noatime; ignoring.")
1486 } else {
1487 switch runtime.GOOS {
1488 case "netbsd", "dragonfly":
1489
1490
1491
1492 if strings.Contains(runtime.GOARCH, "64") {
1493 t.Log(errormsg)
1494 t.Log("Filesystem might not support atime changes; ignoring.")
1495 }
1496 default:
1497 t.Error(errormsg)
1498 }
1499 }
1500 }
1501 }
1502 }
1503 if got, want := mt0, tt.wantMTime; !got.Equal(want) {
1504 errormsg := fmt.Sprintf("ModTime mismatch with values ATime:%q-MTime:%q\ngot: %q\nwant: %q", tt.aTime, tt.mTime, got, want)
1505 switch runtime.GOOS {
1506 case "dragonfly":
1507 t.Log(errormsg)
1508 t.Log("Mtime is always updated; ignoring.")
1509 default:
1510 t.Error(errormsg)
1511 }
1512 }
1513 }
1514 }
1515
1516
1517
1518
1519
1520 func TestChtimesDir(t *testing.T) {
1521 t.Parallel()
1522
1523 name := newDir("TestChtimes", t)
1524 defer RemoveAll(name)
1525
1526 testChtimes(t, name)
1527 }
1528
1529 func testChtimes(t *testing.T, name string) {
1530 st, err := Stat(name)
1531 if err != nil {
1532 t.Fatalf("Stat %s: %s", name, err)
1533 }
1534 preStat := st
1535
1536
1537 at := Atime(preStat)
1538 mt := preStat.ModTime()
1539 err = Chtimes(name, at.Add(-time.Second), mt.Add(-time.Second))
1540 if err != nil {
1541 t.Fatalf("Chtimes %s: %s", name, err)
1542 }
1543
1544 st, err = Stat(name)
1545 if err != nil {
1546 t.Fatalf("second Stat %s: %s", name, err)
1547 }
1548 postStat := st
1549
1550 pat := Atime(postStat)
1551 pmt := postStat.ModTime()
1552 if !pat.Before(at) {
1553 switch runtime.GOOS {
1554 case "plan9":
1555
1556
1557
1558
1559 case "netbsd":
1560 mounts, _ := ReadFile("/proc/mounts")
1561 if strings.Contains(string(mounts), "noatime") {
1562 t.Logf("AccessTime didn't go backwards, but see a filesystem mounted noatime; ignoring. Issue 19293.")
1563 } else {
1564 t.Logf("AccessTime didn't go backwards; was=%v, after=%v (Ignoring on NetBSD, assuming noatime, Issue 19293)", at, pat)
1565 }
1566 default:
1567 t.Errorf("AccessTime didn't go backwards; was=%v, after=%v", at, pat)
1568 }
1569 }
1570
1571 if !pmt.Before(mt) {
1572 t.Errorf("ModTime didn't go backwards; was=%v, after=%v", mt, pmt)
1573 }
1574 }
1575
1576 func TestChtimesToUnixZero(t *testing.T) {
1577 file := newFile("chtimes-to-unix-zero", t)
1578 fn := file.Name()
1579 defer Remove(fn)
1580 if _, err := file.Write([]byte("hi")); err != nil {
1581 t.Fatal(err)
1582 }
1583 if err := file.Close(); err != nil {
1584 t.Fatal(err)
1585 }
1586
1587 unixZero := time.Unix(0, 0)
1588 if err := Chtimes(fn, unixZero, unixZero); err != nil {
1589 t.Fatalf("Chtimes failed: %v", err)
1590 }
1591
1592 st, err := Stat(fn)
1593 if err != nil {
1594 t.Fatal(err)
1595 }
1596
1597 if mt := st.ModTime(); mt != unixZero {
1598 t.Errorf("mtime is %v, want %v", mt, unixZero)
1599 }
1600 }
1601
1602 func TestFileChdir(t *testing.T) {
1603 wd, err := Getwd()
1604 if err != nil {
1605 t.Fatalf("Getwd: %s", err)
1606 }
1607 defer Chdir(wd)
1608
1609 fd, err := Open(".")
1610 if err != nil {
1611 t.Fatalf("Open .: %s", err)
1612 }
1613 defer fd.Close()
1614
1615 if err := Chdir("/"); err != nil {
1616 t.Fatalf("Chdir /: %s", err)
1617 }
1618
1619 if err := fd.Chdir(); err != nil {
1620 t.Fatalf("fd.Chdir: %s", err)
1621 }
1622
1623 wdNew, err := Getwd()
1624 if err != nil {
1625 t.Fatalf("Getwd: %s", err)
1626 }
1627
1628 wdInfo, err := fd.Stat()
1629 if err != nil {
1630 t.Fatal(err)
1631 }
1632 newInfo, err := Stat(wdNew)
1633 if err != nil {
1634 t.Fatal(err)
1635 }
1636 if !SameFile(wdInfo, newInfo) {
1637 t.Fatalf("fd.Chdir failed: got %s, want %s", wdNew, wd)
1638 }
1639 }
1640
1641 func TestChdirAndGetwd(t *testing.T) {
1642 fd, err := Open(".")
1643 if err != nil {
1644 t.Fatalf("Open .: %s", err)
1645 }
1646
1647
1648 dirs := []string{"/", "/usr/bin", "/tmp"}
1649
1650 switch runtime.GOOS {
1651 case "android":
1652 dirs = []string{"/system/bin"}
1653 case "plan9":
1654 dirs = []string{"/", "/usr"}
1655 case "ios", "windows", "wasip1":
1656 dirs = nil
1657 for _, dir := range []string{t.TempDir(), t.TempDir()} {
1658
1659 dir, err = filepath.EvalSymlinks(dir)
1660 if err != nil {
1661 t.Fatalf("EvalSymlinks: %v", err)
1662 }
1663 dirs = append(dirs, dir)
1664 }
1665 }
1666 oldwd := Getenv("PWD")
1667 for mode := 0; mode < 2; mode++ {
1668 for _, d := range dirs {
1669 if mode == 0 {
1670 err = Chdir(d)
1671 } else {
1672 fd1, err1 := Open(d)
1673 if err1 != nil {
1674 t.Errorf("Open %s: %s", d, err1)
1675 continue
1676 }
1677 err = fd1.Chdir()
1678 fd1.Close()
1679 }
1680 if d == "/tmp" {
1681 Setenv("PWD", "/tmp")
1682 }
1683 pwd, err1 := Getwd()
1684 Setenv("PWD", oldwd)
1685 err2 := fd.Chdir()
1686 if err2 != nil {
1687
1688
1689
1690 fmt.Fprintf(Stderr, "fchdir back to dot failed: %s\n", err2)
1691 Exit(1)
1692 }
1693 if err != nil {
1694 fd.Close()
1695 t.Fatalf("Chdir %s: %s", d, err)
1696 }
1697 if err1 != nil {
1698 fd.Close()
1699 t.Fatalf("Getwd in %s: %s", d, err1)
1700 }
1701 if !equal(pwd, d) {
1702 fd.Close()
1703 t.Fatalf("Getwd returned %q want %q", pwd, d)
1704 }
1705 }
1706 }
1707 fd.Close()
1708 }
1709
1710
1711 func TestProgWideChdir(t *testing.T) {
1712 const N = 10
1713 var wg sync.WaitGroup
1714 hold := make(chan struct{})
1715 done := make(chan struct{})
1716
1717 d := t.TempDir()
1718 oldwd, err := Getwd()
1719 if err != nil {
1720 t.Fatalf("Getwd: %v", err)
1721 }
1722 defer func() {
1723 if err := Chdir(oldwd); err != nil {
1724
1725
1726 panic(err)
1727 }
1728 }()
1729
1730
1731
1732
1733
1734
1735 defer wg.Wait()
1736 defer close(done)
1737
1738 for i := 0; i < N; i++ {
1739 wg.Add(1)
1740 go func(i int) {
1741 defer wg.Done()
1742
1743
1744 if i%2 == 1 {
1745
1746
1747
1748
1749
1750 runtime.LockOSThread()
1751 }
1752 select {
1753 case <-done:
1754 return
1755 case <-hold:
1756 }
1757
1758 f0, err := Stat(".")
1759 if err != nil {
1760 t.Error(err)
1761 return
1762 }
1763 pwd, err := Getwd()
1764 if err != nil {
1765 t.Errorf("Getwd: %v", err)
1766 return
1767 }
1768 if pwd != d {
1769 t.Errorf("Getwd() = %q, want %q", pwd, d)
1770 return
1771 }
1772 f1, err := Stat(pwd)
1773 if err != nil {
1774 t.Error(err)
1775 return
1776 }
1777 if !SameFile(f0, f1) {
1778 t.Errorf(`Samefile(Stat("."), Getwd()) reports false (%s != %s)`, f0.Name(), f1.Name())
1779 return
1780 }
1781 }(i)
1782 }
1783 if err = Chdir(d); err != nil {
1784 t.Fatalf("Chdir: %v", err)
1785 }
1786
1787
1788 d, err = Getwd()
1789 if err != nil {
1790 t.Fatalf("Getwd: %v", err)
1791 }
1792 close(hold)
1793 wg.Wait()
1794 }
1795
1796 func TestSeek(t *testing.T) {
1797 t.Parallel()
1798
1799 f := newFile("TestSeek", t)
1800 defer Remove(f.Name())
1801 defer f.Close()
1802
1803 const data = "hello, world\n"
1804 io.WriteString(f, data)
1805
1806 type test struct {
1807 in int64
1808 whence int
1809 out int64
1810 }
1811 var tests = []test{
1812 {0, io.SeekCurrent, int64(len(data))},
1813 {0, io.SeekStart, 0},
1814 {5, io.SeekStart, 5},
1815 {0, io.SeekEnd, int64(len(data))},
1816 {0, io.SeekStart, 0},
1817 {-1, io.SeekEnd, int64(len(data)) - 1},
1818 {1 << 33, io.SeekStart, 1 << 33},
1819 {1 << 33, io.SeekEnd, 1<<33 + int64(len(data))},
1820
1821
1822 {1<<32 - 1, io.SeekStart, 1<<32 - 1},
1823 {0, io.SeekCurrent, 1<<32 - 1},
1824 {2<<32 - 1, io.SeekStart, 2<<32 - 1},
1825 {0, io.SeekCurrent, 2<<32 - 1},
1826 }
1827 for i, tt := range tests {
1828 off, err := f.Seek(tt.in, tt.whence)
1829 if off != tt.out || err != nil {
1830 if e, ok := err.(*PathError); ok && e.Err == syscall.EINVAL && tt.out > 1<<32 && runtime.GOOS == "linux" {
1831 mounts, _ := ReadFile("/proc/mounts")
1832 if strings.Contains(string(mounts), "reiserfs") {
1833
1834 t.Skipf("skipping test known to fail on reiserfs; https://golang.org/issue/91")
1835 }
1836 }
1837 t.Errorf("#%d: Seek(%v, %v) = %v, %v want %v, nil", i, tt.in, tt.whence, off, err, tt.out)
1838 }
1839 }
1840 }
1841
1842 func TestSeekError(t *testing.T) {
1843 switch runtime.GOOS {
1844 case "js", "plan9", "wasip1":
1845 t.Skipf("skipping test on %v", runtime.GOOS)
1846 }
1847 t.Parallel()
1848
1849 r, w, err := Pipe()
1850 if err != nil {
1851 t.Fatal(err)
1852 }
1853 _, err = r.Seek(0, 0)
1854 if err == nil {
1855 t.Fatal("Seek on pipe should fail")
1856 }
1857 if perr, ok := err.(*PathError); !ok || perr.Err != syscall.ESPIPE {
1858 t.Errorf("Seek returned error %v, want &PathError{Err: syscall.ESPIPE}", err)
1859 }
1860 _, err = w.Seek(0, 0)
1861 if err == nil {
1862 t.Fatal("Seek on pipe should fail")
1863 }
1864 if perr, ok := err.(*PathError); !ok || perr.Err != syscall.ESPIPE {
1865 t.Errorf("Seek returned error %v, want &PathError{Err: syscall.ESPIPE}", err)
1866 }
1867 }
1868
1869 type openErrorTest struct {
1870 path string
1871 mode int
1872 error error
1873 }
1874
1875 var openErrorTests = []openErrorTest{
1876 {
1877 sfdir + "/no-such-file",
1878 O_RDONLY,
1879 syscall.ENOENT,
1880 },
1881 {
1882 sfdir,
1883 O_WRONLY,
1884 syscall.EISDIR,
1885 },
1886 {
1887 sfdir + "/" + sfname + "/no-such-file",
1888 O_WRONLY,
1889 syscall.ENOTDIR,
1890 },
1891 }
1892
1893 func TestOpenError(t *testing.T) {
1894 t.Parallel()
1895
1896 for _, tt := range openErrorTests {
1897 f, err := OpenFile(tt.path, tt.mode, 0)
1898 if err == nil {
1899 t.Errorf("Open(%q, %d) succeeded", tt.path, tt.mode)
1900 f.Close()
1901 continue
1902 }
1903 perr, ok := err.(*PathError)
1904 if !ok {
1905 t.Errorf("Open(%q, %d) returns error of %T type; want *PathError", tt.path, tt.mode, err)
1906 }
1907 if perr.Err != tt.error {
1908 if runtime.GOOS == "plan9" {
1909 syscallErrStr := perr.Err.Error()
1910 expectedErrStr := strings.Replace(tt.error.Error(), "file ", "", 1)
1911 if !strings.HasSuffix(syscallErrStr, expectedErrStr) {
1912
1913
1914
1915 if tt.error == syscall.EISDIR && strings.HasSuffix(syscallErrStr, syscall.EACCES.Error()) {
1916 continue
1917 }
1918 t.Errorf("Open(%q, %d) = _, %q; want suffix %q", tt.path, tt.mode, syscallErrStr, expectedErrStr)
1919 }
1920 continue
1921 }
1922 if runtime.GOOS == "dragonfly" {
1923
1924
1925 if tt.error == syscall.EISDIR && perr.Err == syscall.EACCES {
1926 continue
1927 }
1928 }
1929 t.Errorf("Open(%q, %d) = _, %q; want %q", tt.path, tt.mode, perr.Err.Error(), tt.error.Error())
1930 }
1931 }
1932 }
1933
1934 func TestOpenNoName(t *testing.T) {
1935 f, err := Open("")
1936 if err == nil {
1937 f.Close()
1938 t.Fatal(`Open("") succeeded`)
1939 }
1940 }
1941
1942 func runBinHostname(t *testing.T) string {
1943
1944 r, w, err := Pipe()
1945 if err != nil {
1946 t.Fatal(err)
1947 }
1948 defer r.Close()
1949
1950 path, err := exec.LookPath("hostname")
1951 if err != nil {
1952 if errors.Is(err, exec.ErrNotFound) {
1953 t.Skip("skipping test; test requires hostname but it does not exist")
1954 }
1955 t.Fatal(err)
1956 }
1957
1958 argv := []string{"hostname"}
1959 if runtime.GOOS == "aix" {
1960 argv = []string{"hostname", "-s"}
1961 }
1962 p, err := StartProcess(path, argv, &ProcAttr{Files: []*File{nil, w, Stderr}})
1963 if err != nil {
1964 t.Fatal(err)
1965 }
1966 w.Close()
1967
1968 var b strings.Builder
1969 io.Copy(&b, r)
1970 _, err = p.Wait()
1971 if err != nil {
1972 t.Fatalf("run hostname Wait: %v", err)
1973 }
1974 err = p.Kill()
1975 if err == nil {
1976 t.Errorf("expected an error from Kill running 'hostname'")
1977 }
1978 output := b.String()
1979 if n := len(output); n > 0 && output[n-1] == '\n' {
1980 output = output[0 : n-1]
1981 }
1982 if output == "" {
1983 t.Fatalf("/bin/hostname produced no output")
1984 }
1985
1986 return output
1987 }
1988
1989 func testWindowsHostname(t *testing.T, hostname string) {
1990 cmd := testenv.Command(t, "hostname")
1991 out, err := cmd.Output()
1992 if err != nil {
1993 t.Fatalf("Failed to execute hostname command: %v %s", err, out)
1994 }
1995 want := strings.Trim(string(out), "\r\n")
1996 if hostname != want {
1997 t.Fatalf("Hostname() = %q != system hostname of %q", hostname, want)
1998 }
1999 }
2000
2001 func TestHostname(t *testing.T) {
2002 t.Parallel()
2003
2004 hostname, err := Hostname()
2005 if err != nil {
2006 t.Fatal(err)
2007 }
2008 if hostname == "" {
2009 t.Fatal("Hostname returned empty string and no error")
2010 }
2011 if strings.Contains(hostname, "\x00") {
2012 t.Fatalf("unexpected zero byte in hostname: %q", hostname)
2013 }
2014
2015
2016
2017 switch runtime.GOOS {
2018 case "android", "plan9":
2019
2020 return
2021 case "windows":
2022 testWindowsHostname(t, hostname)
2023 return
2024 }
2025
2026 testenv.MustHaveExec(t)
2027
2028
2029
2030
2031 want := runBinHostname(t)
2032 if hostname != want {
2033 host, _, ok := strings.Cut(hostname, ".")
2034 if !ok || host != want {
2035 t.Errorf("Hostname() = %q, want %q", hostname, want)
2036 }
2037 }
2038 }
2039
2040 func TestReadAt(t *testing.T) {
2041 t.Parallel()
2042
2043 f := newFile("TestReadAt", t)
2044 defer Remove(f.Name())
2045 defer f.Close()
2046
2047 const data = "hello, world\n"
2048 io.WriteString(f, data)
2049
2050 b := make([]byte, 5)
2051 n, err := f.ReadAt(b, 7)
2052 if err != nil || n != len(b) {
2053 t.Fatalf("ReadAt 7: %d, %v", n, err)
2054 }
2055 if string(b) != "world" {
2056 t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
2057 }
2058 }
2059
2060
2061
2062
2063
2064 func TestReadAtOffset(t *testing.T) {
2065 t.Parallel()
2066
2067 f := newFile("TestReadAtOffset", t)
2068 defer Remove(f.Name())
2069 defer f.Close()
2070
2071 const data = "hello, world\n"
2072 io.WriteString(f, data)
2073
2074 f.Seek(0, 0)
2075 b := make([]byte, 5)
2076
2077 n, err := f.ReadAt(b, 7)
2078 if err != nil || n != len(b) {
2079 t.Fatalf("ReadAt 7: %d, %v", n, err)
2080 }
2081 if string(b) != "world" {
2082 t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
2083 }
2084
2085 n, err = f.Read(b)
2086 if err != nil || n != len(b) {
2087 t.Fatalf("Read: %d, %v", n, err)
2088 }
2089 if string(b) != "hello" {
2090 t.Fatalf("Read: have %q want %q", string(b), "hello")
2091 }
2092 }
2093
2094
2095 func TestReadAtNegativeOffset(t *testing.T) {
2096 t.Parallel()
2097
2098 f := newFile("TestReadAtNegativeOffset", t)
2099 defer Remove(f.Name())
2100 defer f.Close()
2101
2102 const data = "hello, world\n"
2103 io.WriteString(f, data)
2104
2105 f.Seek(0, 0)
2106 b := make([]byte, 5)
2107
2108 n, err := f.ReadAt(b, -10)
2109
2110 const wantsub = "negative offset"
2111 if !strings.Contains(fmt.Sprint(err), wantsub) || n != 0 {
2112 t.Errorf("ReadAt(-10) = %v, %v; want 0, ...%q...", n, err, wantsub)
2113 }
2114 }
2115
2116 func TestWriteAt(t *testing.T) {
2117 t.Parallel()
2118
2119 f := newFile("TestWriteAt", t)
2120 defer Remove(f.Name())
2121 defer f.Close()
2122
2123 const data = "hello, world\n"
2124 io.WriteString(f, data)
2125
2126 n, err := f.WriteAt([]byte("WORLD"), 7)
2127 if err != nil || n != 5 {
2128 t.Fatalf("WriteAt 7: %d, %v", n, err)
2129 }
2130
2131 b, err := ReadFile(f.Name())
2132 if err != nil {
2133 t.Fatalf("ReadFile %s: %v", f.Name(), err)
2134 }
2135 if string(b) != "hello, WORLD\n" {
2136 t.Fatalf("after write: have %q want %q", string(b), "hello, WORLD\n")
2137 }
2138 }
2139
2140
2141 func TestWriteAtNegativeOffset(t *testing.T) {
2142 t.Parallel()
2143
2144 f := newFile("TestWriteAtNegativeOffset", t)
2145 defer Remove(f.Name())
2146 defer f.Close()
2147
2148 n, err := f.WriteAt([]byte("WORLD"), -10)
2149
2150 const wantsub = "negative offset"
2151 if !strings.Contains(fmt.Sprint(err), wantsub) || n != 0 {
2152 t.Errorf("WriteAt(-10) = %v, %v; want 0, ...%q...", n, err, wantsub)
2153 }
2154 }
2155
2156
2157 func TestWriteAtInAppendMode(t *testing.T) {
2158 defer chtmpdir(t)()
2159 f, err := OpenFile("write_at_in_append_mode.txt", O_APPEND|O_CREATE, 0666)
2160 if err != nil {
2161 t.Fatalf("OpenFile: %v", err)
2162 }
2163 defer f.Close()
2164
2165 _, err = f.WriteAt([]byte(""), 1)
2166 if err != ErrWriteAtInAppendMode {
2167 t.Fatalf("f.WriteAt returned %v, expected %v", err, ErrWriteAtInAppendMode)
2168 }
2169 }
2170
2171 func writeFile(t *testing.T, fname string, flag int, text string) string {
2172 f, err := OpenFile(fname, flag, 0666)
2173 if err != nil {
2174 t.Fatalf("Open: %v", err)
2175 }
2176 n, err := io.WriteString(f, text)
2177 if err != nil {
2178 t.Fatalf("WriteString: %d, %v", n, err)
2179 }
2180 f.Close()
2181 data, err := ReadFile(fname)
2182 if err != nil {
2183 t.Fatalf("ReadFile: %v", err)
2184 }
2185 return string(data)
2186 }
2187
2188 func TestAppend(t *testing.T) {
2189 defer chtmpdir(t)()
2190 const f = "append.txt"
2191 s := writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
2192 if s != "new" {
2193 t.Fatalf("writeFile: have %q want %q", s, "new")
2194 }
2195 s = writeFile(t, f, O_APPEND|O_RDWR, "|append")
2196 if s != "new|append" {
2197 t.Fatalf("writeFile: have %q want %q", s, "new|append")
2198 }
2199 s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "|append")
2200 if s != "new|append|append" {
2201 t.Fatalf("writeFile: have %q want %q", s, "new|append|append")
2202 }
2203 err := Remove(f)
2204 if err != nil {
2205 t.Fatalf("Remove: %v", err)
2206 }
2207 s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "new&append")
2208 if s != "new&append" {
2209 t.Fatalf("writeFile: after append have %q want %q", s, "new&append")
2210 }
2211 s = writeFile(t, f, O_CREATE|O_RDWR, "old")
2212 if s != "old&append" {
2213 t.Fatalf("writeFile: after create have %q want %q", s, "old&append")
2214 }
2215 s = writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
2216 if s != "new" {
2217 t.Fatalf("writeFile: after truncate have %q want %q", s, "new")
2218 }
2219 }
2220
2221 func TestStatDirWithTrailingSlash(t *testing.T) {
2222 t.Parallel()
2223
2224
2225 path := t.TempDir()
2226
2227
2228 if _, err := Stat(path); err != nil {
2229 t.Fatalf("stat %s failed: %s", path, err)
2230 }
2231
2232
2233 path += "/"
2234 if _, err := Stat(path); err != nil {
2235 t.Fatalf("stat %s failed: %s", path, err)
2236 }
2237 }
2238
2239 func TestNilProcessStateString(t *testing.T) {
2240 var ps *ProcessState
2241 s := ps.String()
2242 if s != "<nil>" {
2243 t.Errorf("(*ProcessState)(nil).String() = %q, want %q", s, "<nil>")
2244 }
2245 }
2246
2247 func TestSameFile(t *testing.T) {
2248 defer chtmpdir(t)()
2249 fa, err := Create("a")
2250 if err != nil {
2251 t.Fatalf("Create(a): %v", err)
2252 }
2253 fa.Close()
2254 fb, err := Create("b")
2255 if err != nil {
2256 t.Fatalf("Create(b): %v", err)
2257 }
2258 fb.Close()
2259
2260 ia1, err := Stat("a")
2261 if err != nil {
2262 t.Fatalf("Stat(a): %v", err)
2263 }
2264 ia2, err := Stat("a")
2265 if err != nil {
2266 t.Fatalf("Stat(a): %v", err)
2267 }
2268 if !SameFile(ia1, ia2) {
2269 t.Errorf("files should be same")
2270 }
2271
2272 ib, err := Stat("b")
2273 if err != nil {
2274 t.Fatalf("Stat(b): %v", err)
2275 }
2276 if SameFile(ia1, ib) {
2277 t.Errorf("files should be different")
2278 }
2279 }
2280
2281 func testDevNullFileInfo(t *testing.T, statname, devNullName string, fi FileInfo) {
2282 pre := fmt.Sprintf("%s(%q): ", statname, devNullName)
2283 if fi.Size() != 0 {
2284 t.Errorf(pre+"wrong file size have %d want 0", fi.Size())
2285 }
2286 if fi.Mode()&ModeDevice == 0 {
2287 t.Errorf(pre+"wrong file mode %q: ModeDevice is not set", fi.Mode())
2288 }
2289 if fi.Mode()&ModeCharDevice == 0 {
2290 t.Errorf(pre+"wrong file mode %q: ModeCharDevice is not set", fi.Mode())
2291 }
2292 if fi.Mode().IsRegular() {
2293 t.Errorf(pre+"wrong file mode %q: IsRegular returns true", fi.Mode())
2294 }
2295 }
2296
2297 func testDevNullFile(t *testing.T, devNullName string) {
2298 f, err := Open(devNullName)
2299 if err != nil {
2300 t.Fatalf("Open(%s): %v", devNullName, err)
2301 }
2302 defer f.Close()
2303
2304 fi, err := f.Stat()
2305 if err != nil {
2306 t.Fatalf("Stat(%s): %v", devNullName, err)
2307 }
2308 testDevNullFileInfo(t, "f.Stat", devNullName, fi)
2309
2310 fi, err = Stat(devNullName)
2311 if err != nil {
2312 t.Fatalf("Stat(%s): %v", devNullName, err)
2313 }
2314 testDevNullFileInfo(t, "Stat", devNullName, fi)
2315 }
2316
2317 func TestDevNullFile(t *testing.T) {
2318 t.Parallel()
2319
2320 testDevNullFile(t, DevNull)
2321 if runtime.GOOS == "windows" {
2322 testDevNullFile(t, "./nul")
2323 testDevNullFile(t, "//./nul")
2324 }
2325 }
2326
2327 var testLargeWrite = flag.Bool("large_write", false, "run TestLargeWriteToConsole test that floods console with output")
2328
2329 func TestLargeWriteToConsole(t *testing.T) {
2330 if !*testLargeWrite {
2331 t.Skip("skipping console-flooding test; enable with -large_write")
2332 }
2333 b := make([]byte, 32000)
2334 for i := range b {
2335 b[i] = '.'
2336 }
2337 b[len(b)-1] = '\n'
2338 n, err := Stdout.Write(b)
2339 if err != nil {
2340 t.Fatalf("Write to os.Stdout failed: %v", err)
2341 }
2342 if n != len(b) {
2343 t.Errorf("Write to os.Stdout should return %d; got %d", len(b), n)
2344 }
2345 n, err = Stderr.Write(b)
2346 if err != nil {
2347 t.Fatalf("Write to os.Stderr failed: %v", err)
2348 }
2349 if n != len(b) {
2350 t.Errorf("Write to os.Stderr should return %d; got %d", len(b), n)
2351 }
2352 }
2353
2354 func TestStatDirModeExec(t *testing.T) {
2355 if runtime.GOOS == "wasip1" {
2356 t.Skip("Chmod is not supported on " + runtime.GOOS)
2357 }
2358 t.Parallel()
2359
2360 const mode = 0111
2361
2362 path := t.TempDir()
2363 if err := Chmod(path, 0777); err != nil {
2364 t.Fatalf("Chmod %q 0777: %v", path, err)
2365 }
2366
2367 dir, err := Stat(path)
2368 if err != nil {
2369 t.Fatalf("Stat %q (looking for mode %#o): %s", path, mode, err)
2370 }
2371 if dir.Mode()&mode != mode {
2372 t.Errorf("Stat %q: mode %#o want %#o", path, dir.Mode()&mode, mode)
2373 }
2374 }
2375
2376 func TestStatStdin(t *testing.T) {
2377 switch runtime.GOOS {
2378 case "android", "plan9":
2379 t.Skipf("%s doesn't have /bin/sh", runtime.GOOS)
2380 }
2381
2382 if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
2383 st, err := Stdin.Stat()
2384 if err != nil {
2385 t.Fatalf("Stat failed: %v", err)
2386 }
2387 fmt.Println(st.Mode() & ModeNamedPipe)
2388 Exit(0)
2389 }
2390
2391 exe, err := Executable()
2392 if err != nil {
2393 t.Skipf("can't find executable: %v", err)
2394 }
2395
2396 testenv.MustHaveExec(t)
2397 t.Parallel()
2398
2399 fi, err := Stdin.Stat()
2400 if err != nil {
2401 t.Fatal(err)
2402 }
2403 switch mode := fi.Mode(); {
2404 case mode&ModeCharDevice != 0 && mode&ModeDevice != 0:
2405 case mode&ModeNamedPipe != 0:
2406 default:
2407 t.Fatalf("unexpected Stdin mode (%v), want ModeCharDevice or ModeNamedPipe", mode)
2408 }
2409
2410 cmd := testenv.Command(t, exe, "-test.run=^TestStatStdin$")
2411 cmd = testenv.CleanCmdEnv(cmd)
2412 cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
2413
2414 cmd.Stdin = strings.NewReader("output")
2415
2416 output, err := cmd.CombinedOutput()
2417 if err != nil {
2418 t.Fatalf("Failed to spawn child process: %v %q", err, string(output))
2419 }
2420
2421
2422 if len(output) < 1 || output[0] != 'p' {
2423 t.Fatalf("Child process reports stdin is not pipe '%v'", string(output))
2424 }
2425 }
2426
2427 func TestStatRelativeSymlink(t *testing.T) {
2428 testenv.MustHaveSymlink(t)
2429 t.Parallel()
2430
2431 tmpdir := t.TempDir()
2432 target := filepath.Join(tmpdir, "target")
2433 f, err := Create(target)
2434 if err != nil {
2435 t.Fatal(err)
2436 }
2437 defer f.Close()
2438
2439 st, err := f.Stat()
2440 if err != nil {
2441 t.Fatal(err)
2442 }
2443
2444 link := filepath.Join(tmpdir, "link")
2445 err = Symlink(filepath.Base(target), link)
2446 if err != nil {
2447 t.Fatal(err)
2448 }
2449
2450 st1, err := Stat(link)
2451 if err != nil {
2452 t.Fatal(err)
2453 }
2454
2455 if !SameFile(st, st1) {
2456 t.Error("Stat doesn't follow relative symlink")
2457 }
2458
2459 if runtime.GOOS == "windows" {
2460 Remove(link)
2461 err = Symlink(target[len(filepath.VolumeName(target)):], link)
2462 if err != nil {
2463 t.Fatal(err)
2464 }
2465
2466 st1, err := Stat(link)
2467 if err != nil {
2468 t.Fatal(err)
2469 }
2470
2471 if !SameFile(st, st1) {
2472 t.Error("Stat doesn't follow relative symlink")
2473 }
2474 }
2475 }
2476
2477 func TestReadAtEOF(t *testing.T) {
2478 t.Parallel()
2479
2480 f := newFile("TestReadAtEOF", t)
2481 defer Remove(f.Name())
2482 defer f.Close()
2483
2484 _, err := f.ReadAt(make([]byte, 10), 0)
2485 switch err {
2486 case io.EOF:
2487
2488 case nil:
2489 t.Fatalf("ReadAt succeeded")
2490 default:
2491 t.Fatalf("ReadAt failed: %s", err)
2492 }
2493 }
2494
2495 func TestLongPath(t *testing.T) {
2496 t.Parallel()
2497
2498 tmpdir := newDir("TestLongPath", t)
2499 defer func(d string) {
2500 if err := RemoveAll(d); err != nil {
2501 t.Fatalf("RemoveAll failed: %v", err)
2502 }
2503 }(tmpdir)
2504
2505
2506 sizes := []int{247, 248, 249, 400}
2507 for len(tmpdir) < 400 {
2508 tmpdir += "/dir3456789"
2509 }
2510 for _, sz := range sizes {
2511 t.Run(fmt.Sprintf("length=%d", sz), func(t *testing.T) {
2512 sizedTempDir := tmpdir[:sz-1] + "x"
2513
2514
2515
2516 if err := MkdirAll(sizedTempDir, 0755); err != nil {
2517 t.Fatalf("MkdirAll failed: %v", err)
2518 }
2519 data := []byte("hello world\n")
2520 if err := WriteFile(sizedTempDir+"/foo.txt", data, 0644); err != nil {
2521 t.Fatalf("os.WriteFile() failed: %v", err)
2522 }
2523 if err := Rename(sizedTempDir+"/foo.txt", sizedTempDir+"/bar.txt"); err != nil {
2524 t.Fatalf("Rename failed: %v", err)
2525 }
2526 mtime := time.Now().Truncate(time.Minute)
2527 if err := Chtimes(sizedTempDir+"/bar.txt", mtime, mtime); err != nil {
2528 t.Fatalf("Chtimes failed: %v", err)
2529 }
2530 names := []string{"bar.txt"}
2531 if testenv.HasSymlink() {
2532 if err := Symlink(sizedTempDir+"/bar.txt", sizedTempDir+"/symlink.txt"); err != nil {
2533 t.Fatalf("Symlink failed: %v", err)
2534 }
2535 names = append(names, "symlink.txt")
2536 }
2537 if testenv.HasLink() {
2538 if err := Link(sizedTempDir+"/bar.txt", sizedTempDir+"/link.txt"); err != nil {
2539 t.Fatalf("Link failed: %v", err)
2540 }
2541 names = append(names, "link.txt")
2542 }
2543 for _, wantSize := range []int64{int64(len(data)), 0} {
2544 for _, name := range names {
2545 path := sizedTempDir + "/" + name
2546 dir, err := Stat(path)
2547 if err != nil {
2548 t.Fatalf("Stat(%q) failed: %v", path, err)
2549 }
2550 filesize := size(path, t)
2551 if dir.Size() != filesize || filesize != wantSize {
2552 t.Errorf("Size(%q) is %d, len(ReadFile()) is %d, want %d", path, dir.Size(), filesize, wantSize)
2553 }
2554 if runtime.GOOS != "wasip1" {
2555 err = Chmod(path, dir.Mode())
2556 if err != nil {
2557 t.Fatalf("Chmod(%q) failed: %v", path, err)
2558 }
2559 }
2560 }
2561 if err := Truncate(sizedTempDir+"/bar.txt", 0); err != nil {
2562 t.Fatalf("Truncate failed: %v", err)
2563 }
2564 }
2565 })
2566 }
2567 }
2568
2569 func testKillProcess(t *testing.T, processKiller func(p *Process)) {
2570 testenv.MustHaveExec(t)
2571 t.Parallel()
2572
2573
2574 cmd := testenv.Command(t, Args[0])
2575 cmd.Env = append(cmd.Environ(), "GO_OS_TEST_DRAIN_STDIN=1")
2576 stdout, err := cmd.StdoutPipe()
2577 if err != nil {
2578 t.Fatal(err)
2579 }
2580 stdin, err := cmd.StdinPipe()
2581 if err != nil {
2582 t.Fatal(err)
2583 }
2584 err = cmd.Start()
2585 if err != nil {
2586 t.Fatalf("Failed to start test process: %v", err)
2587 }
2588
2589 defer func() {
2590 if err := cmd.Wait(); err == nil {
2591 t.Errorf("Test process succeeded, but expected to fail")
2592 }
2593 stdin.Close()
2594 }()
2595
2596
2597
2598 io.Copy(io.Discard, stdout)
2599
2600 processKiller(cmd.Process)
2601 }
2602
2603 func TestKillStartProcess(t *testing.T) {
2604 testKillProcess(t, func(p *Process) {
2605 err := p.Kill()
2606 if err != nil {
2607 t.Fatalf("Failed to kill test process: %v", err)
2608 }
2609 })
2610 }
2611
2612 func TestGetppid(t *testing.T) {
2613 if runtime.GOOS == "plan9" {
2614
2615 t.Skipf("skipping test on plan9; see issue 8206")
2616 }
2617
2618 if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
2619 fmt.Print(Getppid())
2620 Exit(0)
2621 }
2622
2623 testenv.MustHaveExec(t)
2624 t.Parallel()
2625
2626 cmd := testenv.Command(t, Args[0], "-test.run=^TestGetppid$")
2627 cmd.Env = append(Environ(), "GO_WANT_HELPER_PROCESS=1")
2628
2629
2630 output, err := cmd.CombinedOutput()
2631 if err != nil {
2632 t.Fatalf("Failed to spawn child process: %v %q", err, string(output))
2633 }
2634
2635 childPpid := string(output)
2636 ourPid := fmt.Sprintf("%d", Getpid())
2637 if childPpid != ourPid {
2638 t.Fatalf("Child process reports parent process id '%v', expected '%v'", childPpid, ourPid)
2639 }
2640 }
2641
2642 func TestKillFindProcess(t *testing.T) {
2643 testKillProcess(t, func(p *Process) {
2644 p2, err := FindProcess(p.Pid)
2645 if err != nil {
2646 t.Fatalf("Failed to find test process: %v", err)
2647 }
2648 err = p2.Kill()
2649 if err != nil {
2650 t.Fatalf("Failed to kill test process: %v", err)
2651 }
2652 })
2653 }
2654
2655 var nilFileMethodTests = []struct {
2656 name string
2657 f func(*File) error
2658 }{
2659 {"Chdir", func(f *File) error { return f.Chdir() }},
2660 {"Close", func(f *File) error { return f.Close() }},
2661 {"Chmod", func(f *File) error { return f.Chmod(0) }},
2662 {"Chown", func(f *File) error { return f.Chown(0, 0) }},
2663 {"Read", func(f *File) error { _, err := f.Read(make([]byte, 0)); return err }},
2664 {"ReadAt", func(f *File) error { _, err := f.ReadAt(make([]byte, 0), 0); return err }},
2665 {"Readdir", func(f *File) error { _, err := f.Readdir(1); return err }},
2666 {"Readdirnames", func(f *File) error { _, err := f.Readdirnames(1); return err }},
2667 {"Seek", func(f *File) error { _, err := f.Seek(0, io.SeekStart); return err }},
2668 {"Stat", func(f *File) error { _, err := f.Stat(); return err }},
2669 {"Sync", func(f *File) error { return f.Sync() }},
2670 {"Truncate", func(f *File) error { return f.Truncate(0) }},
2671 {"Write", func(f *File) error { _, err := f.Write(make([]byte, 0)); return err }},
2672 {"WriteAt", func(f *File) error { _, err := f.WriteAt(make([]byte, 0), 0); return err }},
2673 {"WriteString", func(f *File) error { _, err := f.WriteString(""); return err }},
2674 }
2675
2676
2677 func TestNilFileMethods(t *testing.T) {
2678 t.Parallel()
2679
2680 for _, tt := range nilFileMethodTests {
2681 var file *File
2682 got := tt.f(file)
2683 if got != ErrInvalid {
2684 t.Errorf("%v should fail when f is nil; got %v", tt.name, got)
2685 }
2686 }
2687 }
2688
2689 func mkdirTree(t *testing.T, root string, level, max int) {
2690 if level >= max {
2691 return
2692 }
2693 level++
2694 for i := 'a'; i < 'c'; i++ {
2695 dir := filepath.Join(root, string(i))
2696 if err := Mkdir(dir, 0700); err != nil {
2697 t.Fatal(err)
2698 }
2699 mkdirTree(t, dir, level, max)
2700 }
2701 }
2702
2703
2704
2705 func TestRemoveAllRace(t *testing.T) {
2706 if runtime.GOOS == "windows" {
2707
2708
2709
2710
2711 t.Skip("skipping on windows")
2712 }
2713 if runtime.GOOS == "dragonfly" {
2714 testenv.SkipFlaky(t, 52301)
2715 }
2716
2717 n := runtime.GOMAXPROCS(16)
2718 defer runtime.GOMAXPROCS(n)
2719 root, err := MkdirTemp("", "issue")
2720 if err != nil {
2721 t.Fatal(err)
2722 }
2723 mkdirTree(t, root, 1, 6)
2724 hold := make(chan struct{})
2725 var wg sync.WaitGroup
2726 for i := 0; i < 4; i++ {
2727 wg.Add(1)
2728 go func() {
2729 defer wg.Done()
2730 <-hold
2731 err := RemoveAll(root)
2732 if err != nil {
2733 t.Errorf("unexpected error: %T, %q", err, err)
2734 }
2735 }()
2736 }
2737 close(hold)
2738 wg.Wait()
2739 }
2740
2741
2742 func TestPipeThreads(t *testing.T) {
2743 switch runtime.GOOS {
2744 case "illumos", "solaris":
2745 t.Skip("skipping on Solaris and illumos; issue 19111")
2746 case "windows":
2747 t.Skip("skipping on Windows; issue 19098")
2748 case "plan9":
2749 t.Skip("skipping on Plan 9; does not support runtime poller")
2750 case "js":
2751 t.Skip("skipping on js; no support for os.Pipe")
2752 case "wasip1":
2753 t.Skip("skipping on wasip1; no support for os.Pipe")
2754 }
2755
2756 threads := 100
2757
2758
2759 if runtime.GOOS == "openbsd" {
2760 threads = 50
2761 }
2762
2763 r := make([]*File, threads)
2764 w := make([]*File, threads)
2765 for i := 0; i < threads; i++ {
2766 rp, wp, err := Pipe()
2767 if err != nil {
2768 for j := 0; j < i; j++ {
2769 r[j].Close()
2770 w[j].Close()
2771 }
2772 t.Fatal(err)
2773 }
2774 r[i] = rp
2775 w[i] = wp
2776 }
2777
2778 defer debug.SetMaxThreads(debug.SetMaxThreads(threads / 2))
2779
2780 creading := make(chan bool, threads)
2781 cdone := make(chan bool, threads)
2782 for i := 0; i < threads; i++ {
2783 go func(i int) {
2784 var b [1]byte
2785 creading <- true
2786 if _, err := r[i].Read(b[:]); err != nil {
2787 t.Error(err)
2788 }
2789 if err := r[i].Close(); err != nil {
2790 t.Error(err)
2791 }
2792 cdone <- true
2793 }(i)
2794 }
2795
2796 for i := 0; i < threads; i++ {
2797 <-creading
2798 }
2799
2800
2801
2802
2803 for i := 0; i < threads; i++ {
2804 if _, err := w[i].Write([]byte{0}); err != nil {
2805 t.Error(err)
2806 }
2807 if err := w[i].Close(); err != nil {
2808 t.Error(err)
2809 }
2810 <-cdone
2811 }
2812 }
2813
2814 func testDoubleCloseError(path string) func(*testing.T) {
2815 return func(t *testing.T) {
2816 t.Parallel()
2817
2818 file, err := Open(path)
2819 if err != nil {
2820 t.Fatal(err)
2821 }
2822 if err := file.Close(); err != nil {
2823 t.Fatalf("unexpected error from Close: %v", err)
2824 }
2825 if err := file.Close(); err == nil {
2826 t.Error("second Close did not fail")
2827 } else if pe, ok := err.(*PathError); !ok {
2828 t.Errorf("second Close: got %T, want %T", err, pe)
2829 } else if pe.Err != ErrClosed {
2830 t.Errorf("second Close: got %q, want %q", pe.Err, ErrClosed)
2831 } else {
2832 t.Logf("second close returned expected error %q", err)
2833 }
2834 }
2835 }
2836
2837 func TestDoubleCloseError(t *testing.T) {
2838 t.Parallel()
2839 t.Run("file", testDoubleCloseError(filepath.Join(sfdir, sfname)))
2840 t.Run("dir", testDoubleCloseError(sfdir))
2841 }
2842
2843 func TestUserCacheDir(t *testing.T) {
2844 t.Parallel()
2845
2846 dir, err := UserCacheDir()
2847 if err != nil {
2848 t.Skipf("skipping: %v", err)
2849 }
2850 if dir == "" {
2851 t.Fatalf("UserCacheDir returned %q; want non-empty path or error", dir)
2852 }
2853
2854 fi, err := Stat(dir)
2855 if err != nil {
2856 if IsNotExist(err) {
2857 t.Log(err)
2858 return
2859 }
2860 t.Fatal(err)
2861 }
2862 if !fi.IsDir() {
2863 t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
2864 }
2865 }
2866
2867 func TestUserConfigDir(t *testing.T) {
2868 t.Parallel()
2869
2870 dir, err := UserConfigDir()
2871 if err != nil {
2872 t.Skipf("skipping: %v", err)
2873 }
2874 if dir == "" {
2875 t.Fatalf("UserConfigDir returned %q; want non-empty path or error", dir)
2876 }
2877
2878 fi, err := Stat(dir)
2879 if err != nil {
2880 if IsNotExist(err) {
2881 t.Log(err)
2882 return
2883 }
2884 t.Fatal(err)
2885 }
2886 if !fi.IsDir() {
2887 t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
2888 }
2889 }
2890
2891 func TestUserHomeDir(t *testing.T) {
2892 t.Parallel()
2893
2894 dir, err := UserHomeDir()
2895 if dir == "" && err == nil {
2896 t.Fatal("UserHomeDir returned an empty string but no error")
2897 }
2898 if err != nil {
2899
2900
2901 t.Skipf("skipping: %v", err)
2902 }
2903
2904 fi, err := Stat(dir)
2905 if err != nil {
2906 if IsNotExist(err) {
2907
2908
2909
2910 t.Log(err)
2911 return
2912 }
2913 t.Fatal(err)
2914 }
2915 if !fi.IsDir() {
2916 t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
2917 }
2918 }
2919
2920 func TestDirSeek(t *testing.T) {
2921 t.Parallel()
2922
2923 wd, err := Getwd()
2924 if err != nil {
2925 t.Fatal(err)
2926 }
2927 f, err := Open(wd)
2928 if err != nil {
2929 t.Fatal(err)
2930 }
2931 dirnames1, err := f.Readdirnames(0)
2932 if err != nil {
2933 t.Fatal(err)
2934 }
2935
2936 ret, err := f.Seek(0, 0)
2937 if err != nil {
2938 t.Fatal(err)
2939 }
2940 if ret != 0 {
2941 t.Fatalf("seek result not zero: %d", ret)
2942 }
2943
2944 dirnames2, err := f.Readdirnames(0)
2945 if err != nil {
2946 t.Fatal(err)
2947 }
2948
2949 if len(dirnames1) != len(dirnames2) {
2950 t.Fatalf("listings have different lengths: %d and %d\n", len(dirnames1), len(dirnames2))
2951 }
2952 for i, n1 := range dirnames1 {
2953 n2 := dirnames2[i]
2954 if n1 != n2 {
2955 t.Fatalf("different name i=%d n1=%s n2=%s\n", i, n1, n2)
2956 }
2957 }
2958 }
2959
2960 func TestReaddirSmallSeek(t *testing.T) {
2961
2962
2963
2964 t.Parallel()
2965
2966 wd, err := Getwd()
2967 if err != nil {
2968 t.Fatal(err)
2969 }
2970 df, err := Open(filepath.Join(wd, "testdata", "issue37161"))
2971 if err != nil {
2972 t.Fatal(err)
2973 }
2974 names1, err := df.Readdirnames(1)
2975 if err != nil {
2976 t.Fatal(err)
2977 }
2978 if _, err = df.Seek(0, 0); err != nil {
2979 t.Fatal(err)
2980 }
2981 names2, err := df.Readdirnames(0)
2982 if err != nil {
2983 t.Fatal(err)
2984 }
2985 if len(names2) != 3 {
2986 t.Fatalf("first names: %v, second names: %v", names1, names2)
2987 }
2988 }
2989
2990
2991
2992 func isDeadlineExceeded(err error) bool {
2993 if !IsTimeout(err) {
2994 return false
2995 }
2996 if !errors.Is(err, ErrDeadlineExceeded) {
2997 return false
2998 }
2999 return true
3000 }
3001
3002
3003 func TestOpenFileKeepsPermissions(t *testing.T) {
3004 t.Parallel()
3005
3006 dir := t.TempDir()
3007 name := filepath.Join(dir, "x")
3008 f, err := Create(name)
3009 if err != nil {
3010 t.Fatal(err)
3011 }
3012 if err := f.Close(); err != nil {
3013 t.Error(err)
3014 }
3015 f, err = OpenFile(name, O_WRONLY|O_CREATE|O_TRUNC, 0)
3016 if err != nil {
3017 t.Fatal(err)
3018 }
3019 if fi, err := f.Stat(); err != nil {
3020 t.Error(err)
3021 } else if fi.Mode()&0222 == 0 {
3022 t.Errorf("f.Stat.Mode after OpenFile is %v, should be writable", fi.Mode())
3023 }
3024 if err := f.Close(); err != nil {
3025 t.Error(err)
3026 }
3027 if fi, err := Stat(name); err != nil {
3028 t.Error(err)
3029 } else if fi.Mode()&0222 == 0 {
3030 t.Errorf("Stat after OpenFile is %v, should be writable", fi.Mode())
3031 }
3032 }
3033
3034 func forceMFTUpdateOnWindows(t *testing.T, path string) {
3035 t.Helper()
3036
3037 if runtime.GOOS != "windows" {
3038 return
3039 }
3040
3041
3042
3043 if err := filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
3044 if err != nil {
3045 t.Fatal(err)
3046 }
3047 info, err := d.Info()
3048 if err != nil {
3049 t.Fatal(err)
3050 }
3051 stat, err := Stat(path)
3052 if err != nil {
3053 t.Fatal(err)
3054 }
3055 if stat.ModTime() == info.ModTime() {
3056 return nil
3057 }
3058 if err := Chtimes(path, stat.ModTime(), stat.ModTime()); err != nil {
3059 t.Log(err)
3060 }
3061 return nil
3062 }); err != nil {
3063 t.Fatal(err)
3064 }
3065 }
3066
3067 func TestDirFS(t *testing.T) {
3068 t.Parallel()
3069
3070 forceMFTUpdateOnWindows(t, "./testdata/dirfs")
3071
3072 fsys := DirFS("./testdata/dirfs")
3073 if err := fstest.TestFS(fsys, "a", "b", "dir/x"); err != nil {
3074 t.Fatal(err)
3075 }
3076
3077 rdfs, ok := fsys.(fs.ReadDirFS)
3078 if !ok {
3079 t.Error("expected DirFS result to implement fs.ReadDirFS")
3080 }
3081 if _, err := rdfs.ReadDir("nonexistent"); err == nil {
3082 t.Error("fs.ReadDir of nonexistent directory succeeded")
3083 }
3084
3085
3086
3087 const nonesuch = "dir/nonesuch"
3088 _, err := fsys.Open(nonesuch)
3089 if err == nil {
3090 t.Error("fs.Open of nonexistent file succeeded")
3091 } else {
3092 if !strings.Contains(err.Error(), nonesuch) {
3093 t.Errorf("error %q does not contain %q", err, nonesuch)
3094 }
3095 if strings.Contains(err.(*PathError).Path, "testdata") {
3096 t.Errorf("error %q contains %q", err, "testdata")
3097 }
3098 }
3099
3100
3101 d := DirFS(".")
3102 _, err = d.Open(`testdata\dirfs`)
3103 if err == nil {
3104 t.Fatalf(`Open testdata\dirfs succeeded`)
3105 }
3106
3107
3108 _, err = d.Open(`NUL`)
3109 if err == nil {
3110 t.Errorf(`Open NUL succeeded`)
3111 }
3112 }
3113
3114 func TestDirFSRootDir(t *testing.T) {
3115 t.Parallel()
3116
3117 cwd, err := Getwd()
3118 if err != nil {
3119 t.Fatal(err)
3120 }
3121 cwd = cwd[len(filepath.VolumeName(cwd)):]
3122 cwd = filepath.ToSlash(cwd)
3123 cwd = strings.TrimPrefix(cwd, "/")
3124
3125
3126 d := DirFS("/")
3127 f, err := d.Open(cwd + "/testdata/dirfs/a")
3128 if err != nil {
3129 t.Fatal(err)
3130 }
3131 f.Close()
3132 }
3133
3134 func TestDirFSEmptyDir(t *testing.T) {
3135 t.Parallel()
3136
3137 d := DirFS("")
3138 cwd, _ := Getwd()
3139 for _, path := range []string{
3140 "testdata/dirfs/a",
3141 filepath.ToSlash(cwd) + "/testdata/dirfs/a",
3142 } {
3143 _, err := d.Open(path)
3144 if err == nil {
3145 t.Fatalf(`DirFS("").Open(%q) succeeded`, path)
3146 }
3147 }
3148 }
3149
3150 func TestDirFSPathsValid(t *testing.T) {
3151 if runtime.GOOS == "windows" {
3152 t.Skipf("skipping on Windows")
3153 }
3154 t.Parallel()
3155
3156 d := t.TempDir()
3157 if err := WriteFile(filepath.Join(d, "control.txt"), []byte(string("Hello, world!")), 0644); err != nil {
3158 t.Fatal(err)
3159 }
3160 if err := WriteFile(filepath.Join(d, `e:xperi\ment.txt`), []byte(string("Hello, colon and backslash!")), 0644); err != nil {
3161 t.Fatal(err)
3162 }
3163
3164 fsys := DirFS(d)
3165 err := fs.WalkDir(fsys, ".", func(path string, e fs.DirEntry, err error) error {
3166 if fs.ValidPath(e.Name()) {
3167 t.Logf("%q ok", e.Name())
3168 } else {
3169 t.Errorf("%q INVALID", e.Name())
3170 }
3171 return nil
3172 })
3173 if err != nil {
3174 t.Fatal(err)
3175 }
3176 }
3177
3178 func TestReadFileProc(t *testing.T) {
3179 t.Parallel()
3180
3181
3182
3183
3184
3185
3186 name := "/proc/sys/fs/pipe-max-size"
3187 if _, err := Stat(name); err != nil {
3188 t.Skip(err)
3189 }
3190 data, err := ReadFile(name)
3191 if err != nil {
3192 t.Fatal(err)
3193 }
3194 if len(data) == 0 || data[len(data)-1] != '\n' {
3195 t.Fatalf("read %s: not newline-terminated: %q", name, data)
3196 }
3197 }
3198
3199 func TestDirFSReadFileProc(t *testing.T) {
3200 t.Parallel()
3201
3202 fsys := DirFS("/")
3203 name := "proc/sys/fs/pipe-max-size"
3204 if _, err := fs.Stat(fsys, name); err != nil {
3205 t.Skip()
3206 }
3207 data, err := fs.ReadFile(fsys, name)
3208 if err != nil {
3209 t.Fatal(err)
3210 }
3211 if len(data) == 0 || data[len(data)-1] != '\n' {
3212 t.Fatalf("read %s: not newline-terminated: %q", name, data)
3213 }
3214 }
3215
3216 func TestWriteStringAlloc(t *testing.T) {
3217 if runtime.GOOS == "js" {
3218 t.Skip("js allocates a lot during File.WriteString")
3219 }
3220 d := t.TempDir()
3221 f, err := Create(filepath.Join(d, "whiteboard.txt"))
3222 if err != nil {
3223 t.Fatal(err)
3224 }
3225 defer f.Close()
3226 allocs := testing.AllocsPerRun(100, func() {
3227 f.WriteString("I will not allocate when passed a string longer than 32 bytes.\n")
3228 })
3229 if allocs != 0 {
3230 t.Errorf("expected 0 allocs for File.WriteString, got %v", allocs)
3231 }
3232 }
3233
3234
3235 func TestPipeIOCloseRace(t *testing.T) {
3236
3237 if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
3238 t.Skipf("skipping on %s: no pipes", runtime.GOOS)
3239 }
3240 t.Parallel()
3241
3242 r, w, err := Pipe()
3243 if err != nil {
3244 t.Fatal(err)
3245 }
3246
3247 var wg sync.WaitGroup
3248 wg.Add(3)
3249
3250 go func() {
3251 defer wg.Done()
3252 for {
3253 n, err := w.Write([]byte("hi"))
3254 if err != nil {
3255
3256
3257 switch {
3258 case errors.Is(err, ErrClosed),
3259 strings.Contains(err.Error(), "broken pipe"),
3260 strings.Contains(err.Error(), "pipe is being closed"),
3261 strings.Contains(err.Error(), "hungup channel"):
3262
3263 default:
3264
3265 t.Error(err)
3266 }
3267 return
3268 }
3269 if n != 2 {
3270 t.Errorf("wrote %d bytes, expected 2", n)
3271 return
3272 }
3273 }
3274 }()
3275
3276 go func() {
3277 defer wg.Done()
3278 for {
3279 var buf [2]byte
3280 n, err := r.Read(buf[:])
3281 if err != nil {
3282 if err != io.EOF && !errors.Is(err, ErrClosed) {
3283 t.Error(err)
3284 }
3285 return
3286 }
3287 if n != 2 {
3288 t.Errorf("read %d bytes, want 2", n)
3289 }
3290 }
3291 }()
3292
3293 go func() {
3294 defer wg.Done()
3295
3296
3297
3298
3299 time.Sleep(time.Millisecond)
3300
3301 if err := r.Close(); err != nil {
3302 t.Error(err)
3303 }
3304 if err := w.Close(); err != nil {
3305 t.Error(err)
3306 }
3307 }()
3308
3309 wg.Wait()
3310 }
3311
3312
3313 func TestPipeCloseRace(t *testing.T) {
3314
3315 if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
3316 t.Skipf("skipping on %s: no pipes", runtime.GOOS)
3317 }
3318 t.Parallel()
3319
3320 r, w, err := Pipe()
3321 if err != nil {
3322 t.Fatal(err)
3323 }
3324 var wg sync.WaitGroup
3325 c := make(chan error, 4)
3326 f := func() {
3327 defer wg.Done()
3328 c <- r.Close()
3329 c <- w.Close()
3330 }
3331 wg.Add(2)
3332 go f()
3333 go f()
3334 nils, errs := 0, 0
3335 for i := 0; i < 4; i++ {
3336 err := <-c
3337 if err == nil {
3338 nils++
3339 } else {
3340 errs++
3341 }
3342 }
3343 if nils != 2 || errs != 2 {
3344 t.Errorf("got nils %d errs %d, want 2 2", nils, errs)
3345 }
3346 }
3347
3348 func TestRandomLen(t *testing.T) {
3349 for range 5 {
3350 dir, err := MkdirTemp(t.TempDir(), "*")
3351 if err != nil {
3352 t.Fatal(err)
3353 }
3354 base := filepath.Base(dir)
3355 if len(base) > 10 {
3356 t.Errorf("MkdirTemp returned len %d: %s", len(base), base)
3357 }
3358 }
3359 for range 5 {
3360 f, err := CreateTemp(t.TempDir(), "*")
3361 if err != nil {
3362 t.Fatal(err)
3363 }
3364 base := filepath.Base(f.Name())
3365 f.Close()
3366 if len(base) > 10 {
3367 t.Errorf("CreateTemp returned len %d: %s", len(base), base)
3368 }
3369 }
3370 }
3371
3372 func TestCopyFS(t *testing.T) {
3373 t.Parallel()
3374
3375
3376 forceMFTUpdateOnWindows(t, "./testdata/dirfs")
3377 fsys := DirFS("./testdata/dirfs")
3378 tmpDir := t.TempDir()
3379 if err := CopyFS(tmpDir, fsys); err != nil {
3380 t.Fatal("CopyFS:", err)
3381 }
3382 forceMFTUpdateOnWindows(t, tmpDir)
3383 tmpFsys := DirFS(tmpDir)
3384 if err := fstest.TestFS(tmpFsys, "a", "b", "dir/x"); err != nil {
3385 t.Fatal("TestFS:", err)
3386 }
3387 if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
3388 if d.IsDir() {
3389 return nil
3390 }
3391
3392 data, err := fs.ReadFile(fsys, path)
3393 if err != nil {
3394 return err
3395 }
3396 newData, err := fs.ReadFile(tmpFsys, path)
3397 if err != nil {
3398 return err
3399 }
3400 if !bytes.Equal(data, newData) {
3401 return errors.New("file " + path + " contents differ")
3402 }
3403 return nil
3404 }); err != nil {
3405 t.Fatal("comparing two directories:", err)
3406 }
3407
3408
3409 fsys = fstest.MapFS{
3410 "william": {Data: []byte("Shakespeare\n")},
3411 "carl": {Data: []byte("Gauss\n")},
3412 "daVinci": {Data: []byte("Leonardo\n")},
3413 "einstein": {Data: []byte("Albert\n")},
3414 "dir/newton": {Data: []byte("Sir Isaac\n")},
3415 }
3416 tmpDir = t.TempDir()
3417 if err := CopyFS(tmpDir, fsys); err != nil {
3418 t.Fatal("CopyFS:", err)
3419 }
3420 forceMFTUpdateOnWindows(t, tmpDir)
3421 tmpFsys = DirFS(tmpDir)
3422 if err := fstest.TestFS(tmpFsys, "william", "carl", "daVinci", "einstein", "dir/newton"); err != nil {
3423 t.Fatal("TestFS:", err)
3424 }
3425 if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
3426 if d.IsDir() {
3427 return nil
3428 }
3429
3430 data, err := fs.ReadFile(fsys, path)
3431 if err != nil {
3432 return err
3433 }
3434 newData, err := fs.ReadFile(tmpFsys, path)
3435 if err != nil {
3436 return err
3437 }
3438 if !bytes.Equal(data, newData) {
3439 return errors.New("file " + path + " contents differ")
3440 }
3441 return nil
3442 }); err != nil {
3443 t.Fatal("comparing two directories:", err)
3444 }
3445 }
3446
3447 func TestCopyFSWithSymlinks(t *testing.T) {
3448
3449 testenv.MustHaveSymlink(t)
3450
3451
3452 tmpDir := t.TempDir()
3453 outsideDir, err := MkdirTemp(tmpDir, "copyfs_out_")
3454 if err != nil {
3455 t.Fatalf("MkdirTemp: %v", err)
3456 }
3457 outsideFile := filepath.Join(outsideDir, "file.out.txt")
3458
3459 if err := WriteFile(outsideFile, []byte("Testing CopyFS outside"), 0644); err != nil {
3460 t.Fatalf("WriteFile: %v", err)
3461 }
3462
3463
3464 insideDir, err := MkdirTemp(tmpDir, "copyfs_in_")
3465 if err != nil {
3466 t.Fatalf("MkdirTemp: %v", err)
3467 }
3468 insideFile := filepath.Join(insideDir, "file.in.txt")
3469 if err := WriteFile(insideFile, []byte("Testing CopyFS inside"), 0644); err != nil {
3470 t.Fatalf("WriteFile: %v", err)
3471 }
3472
3473
3474 linkInDir := filepath.Join(insideDir, "in_symlinks")
3475 if err := Mkdir(linkInDir, 0755); err != nil {
3476 t.Fatalf("Mkdir: %v", err)
3477 }
3478 linkOutDir := filepath.Join(insideDir, "out_symlinks")
3479 if err := Mkdir(linkOutDir, 0755); err != nil {
3480 t.Fatalf("Mkdir: %v", err)
3481 }
3482
3483
3484 outLinkFile := filepath.Join(linkOutDir, "file.abs.out.link")
3485 if err := Symlink(outsideFile, outLinkFile); err != nil {
3486 t.Fatalf("Symlink: %v", err)
3487 }
3488
3489
3490 relOutsideFile, err := filepath.Rel(filepath.Join(linkOutDir, "."), outsideFile)
3491 if err != nil {
3492 t.Fatalf("filepath.Rel: %v", err)
3493 }
3494 relOutLinkFile := filepath.Join(linkOutDir, "file.rel.out.link")
3495 if err := Symlink(relOutsideFile, relOutLinkFile); err != nil {
3496 t.Fatalf("Symlink: %v", err)
3497 }
3498
3499
3500 relInsideFile, err := filepath.Rel(filepath.Join(linkInDir, "."), insideFile)
3501 if err != nil {
3502 t.Fatalf("filepath.Rel: %v", err)
3503 }
3504 relInLinkFile := filepath.Join(linkInDir, "file.rel.in.link")
3505 if err := Symlink(relInsideFile, relInLinkFile); err != nil {
3506 t.Fatalf("Symlink: %v", err)
3507 }
3508
3509
3510 forceMFTUpdateOnWindows(t, insideDir)
3511 fsys := DirFS(insideDir)
3512 tmpDupDir, err := MkdirTemp(tmpDir, "copyfs_dup_")
3513 if err != nil {
3514 t.Fatalf("MkdirTemp: %v", err)
3515 }
3516
3517
3518
3519
3520 if err := CopyFS(tmpDupDir, fsys); !errors.Is(err, ErrInvalid) {
3521 t.Fatalf("got %v, want ErrInvalid", err)
3522 }
3523 t.Skip("skip the subsequent test and wait for #49580")
3524
3525 forceMFTUpdateOnWindows(t, tmpDupDir)
3526 tmpFsys := DirFS(tmpDupDir)
3527 if err := fstest.TestFS(tmpFsys, "file.in.txt", "out_symlinks/file.abs.out.link", "out_symlinks/file.rel.out.link", "in_symlinks/file.rel.in.link"); err != nil {
3528 t.Fatal("TestFS:", err)
3529 }
3530 if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
3531 if d.IsDir() {
3532 return nil
3533 }
3534
3535 fi, err := d.Info()
3536 if err != nil {
3537 return err
3538 }
3539 if filepath.Ext(path) == ".link" {
3540 if fi.Mode()&ModeSymlink == 0 {
3541 return errors.New("original file " + path + " should be a symlink")
3542 }
3543 tmpfi, err := fs.Stat(tmpFsys, path)
3544 if err != nil {
3545 return err
3546 }
3547 if tmpfi.Mode()&ModeSymlink != 0 {
3548 return errors.New("copied file " + path + " should not be a symlink")
3549 }
3550 }
3551
3552 data, err := fs.ReadFile(fsys, path)
3553 if err != nil {
3554 return err
3555 }
3556 newData, err := fs.ReadFile(tmpFsys, path)
3557 if err != nil {
3558 return err
3559 }
3560 if !bytes.Equal(data, newData) {
3561 return errors.New("file " + path + " contents differ")
3562 }
3563
3564 var target string
3565 switch fileName := filepath.Base(path); fileName {
3566 case "file.abs.out.link", "file.rel.out.link":
3567 target = outsideFile
3568 case "file.rel.in.link":
3569 target = insideFile
3570 }
3571 if len(target) > 0 {
3572 targetData, err := ReadFile(target)
3573 if err != nil {
3574 return err
3575 }
3576 if !bytes.Equal(targetData, newData) {
3577 return errors.New("file " + path + " contents differ from target")
3578 }
3579 }
3580
3581 return nil
3582 }); err != nil {
3583 t.Fatal("comparing two directories:", err)
3584 }
3585 }
3586
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