os_unix_test.go

     1  // Copyright 2009 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  //go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris
     6  
     7  package os_test
     8  
     9  import (
    10  	"io"
    11  	"os"
    12  	. "os"
    13  	"path/filepath"
    14  	"runtime"
    15  	"strings"
    16  	"syscall"
    17  	"testing"
    18  	"time"
    19  )
    20  
    21  func init() {
    22  	isReadonlyError = func(err error) bool { return err == syscall.EROFS }
    23  }
    24  
    25  // For TestRawConnReadWrite.
    26  type syscallDescriptor = int
    27  
    28  func checkUidGid(t *testing.T, path string, uid, gid int) {
    29  	dir, err := Lstat(path)
    30  	if err != nil {
    31  		t.Fatalf("Lstat %q (looking for uid/gid %d/%d): %s", path, uid, gid, err)
    32  	}
    33  	sys := dir.Sys().(*syscall.Stat_t)
    34  	if int(sys.Uid) != uid {
    35  		t.Errorf("Lstat %q: uid %d want %d", path, sys.Uid, uid)
    36  	}
    37  	if int(sys.Gid) != gid {
    38  		t.Errorf("Lstat %q: gid %d want %d", path, sys.Gid, gid)
    39  	}
    40  }
    41  
    42  func TestChown(t *testing.T) {
    43  	// Use TempDir() to make sure we're on a local file system,
    44  	// so that the group ids returned by Getgroups will be allowed
    45  	// on the file. On NFS, the Getgroups groups are
    46  	// basically useless.
    47  	f := newFile("TestChown", t)
    48  	defer Remove(f.Name())
    49  	defer f.Close()
    50  	dir, err := f.Stat()
    51  	if err != nil {
    52  		t.Fatalf("stat %s: %s", f.Name(), err)
    53  	}
    54  
    55  	// Can't change uid unless root, but can try
    56  	// changing the group id. First try our current group.
    57  	gid := Getgid()
    58  	t.Log("gid:", gid)
    59  	if err = Chown(f.Name(), -1, gid); err != nil {
    60  		t.Fatalf("chown %s -1 %d: %s", f.Name(), gid, err)
    61  	}
    62  	sys := dir.Sys().(*syscall.Stat_t)
    63  	checkUidGid(t, f.Name(), int(sys.Uid), gid)
    64  
    65  	// Then try all the auxiliary groups.
    66  	groups, err := Getgroups()
    67  	if err != nil {
    68  		t.Fatalf("getgroups: %s", err)
    69  	}
    70  	t.Log("groups: ", groups)
    71  	for _, g := range groups {
    72  		if err = Chown(f.Name(), -1, g); err != nil {
    73  			t.Fatalf("chown %s -1 %d: %s", f.Name(), g, err)
    74  		}
    75  		checkUidGid(t, f.Name(), int(sys.Uid), g)
    76  
    77  		// change back to gid to test fd.Chown
    78  		if err = f.Chown(-1, gid); err != nil {
    79  			t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
    80  		}
    81  		checkUidGid(t, f.Name(), int(sys.Uid), gid)
    82  	}
    83  }
    84  
    85  func TestFileChown(t *testing.T) {
    86  	// Use TempDir() to make sure we're on a local file system,
    87  	// so that the group ids returned by Getgroups will be allowed
    88  	// on the file. On NFS, the Getgroups groups are
    89  	// basically useless.
    90  	f := newFile("TestFileChown", t)
    91  	defer Remove(f.Name())
    92  	defer f.Close()
    93  	dir, err := f.Stat()
    94  	if err != nil {
    95  		t.Fatalf("stat %s: %s", f.Name(), err)
    96  	}
    97  
    98  	// Can't change uid unless root, but can try
    99  	// changing the group id. First try our current group.
   100  	gid := Getgid()
   101  	t.Log("gid:", gid)
   102  	if err = f.Chown(-1, gid); err != nil {
   103  		t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
   104  	}
   105  	sys := dir.Sys().(*syscall.Stat_t)
   106  	checkUidGid(t, f.Name(), int(sys.Uid), gid)
   107  
   108  	// Then try all the auxiliary groups.
   109  	groups, err := Getgroups()
   110  	if err != nil {
   111  		t.Fatalf("getgroups: %s", err)
   112  	}
   113  	t.Log("groups: ", groups)
   114  	for _, g := range groups {
   115  		if err = f.Chown(-1, g); err != nil {
   116  			t.Fatalf("fchown %s -1 %d: %s", f.Name(), g, err)
   117  		}
   118  		checkUidGid(t, f.Name(), int(sys.Uid), g)
   119  
   120  		// change back to gid to test fd.Chown
   121  		if err = f.Chown(-1, gid); err != nil {
   122  			t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
   123  		}
   124  		checkUidGid(t, f.Name(), int(sys.Uid), gid)
   125  	}
   126  }
   127  
   128  func TestLchown(t *testing.T) {
   129  	// Use TempDir() to make sure we're on a local file system,
   130  	// so that the group ids returned by Getgroups will be allowed
   131  	// on the file. On NFS, the Getgroups groups are
   132  	// basically useless.
   133  	f := newFile("TestLchown", t)
   134  	defer Remove(f.Name())
   135  	defer f.Close()
   136  	dir, err := f.Stat()
   137  	if err != nil {
   138  		t.Fatalf("stat %s: %s", f.Name(), err)
   139  	}
   140  
   141  	linkname := f.Name() + "2"
   142  	if err := Symlink(f.Name(), linkname); err != nil {
   143  		if runtime.GOOS == "android" && IsPermission(err) {
   144  			t.Skip("skipping test on Android; permission error creating symlink")
   145  		}
   146  		t.Fatalf("link %s -> %s: %v", f.Name(), linkname, err)
   147  	}
   148  	defer Remove(linkname)
   149  
   150  	// Can't change uid unless root, but can try
   151  	// changing the group id. First try our current group.
   152  	gid := Getgid()
   153  	t.Log("gid:", gid)
   154  	if err = Lchown(linkname, -1, gid); err != nil {
   155  		if err, ok := err.(*PathError); ok && err.Err == syscall.ENOSYS {
   156  			t.Skip("lchown is unavailable")
   157  		}
   158  		t.Fatalf("lchown %s -1 %d: %s", linkname, gid, err)
   159  	}
   160  	sys := dir.Sys().(*syscall.Stat_t)
   161  	checkUidGid(t, linkname, int(sys.Uid), gid)
   162  
   163  	// Then try all the auxiliary groups.
   164  	groups, err := Getgroups()
   165  	if err != nil {
   166  		t.Fatalf("getgroups: %s", err)
   167  	}
   168  	t.Log("groups: ", groups)
   169  	for _, g := range groups {
   170  		if err = Lchown(linkname, -1, g); err != nil {
   171  			t.Fatalf("lchown %s -1 %d: %s", linkname, g, err)
   172  		}
   173  		checkUidGid(t, linkname, int(sys.Uid), g)
   174  
   175  		// Check that link target's gid is unchanged.
   176  		checkUidGid(t, f.Name(), int(sys.Uid), int(sys.Gid))
   177  	}
   178  }
   179  
   180  // Issue 16919: Readdir must return a non-empty slice or an error.
   181  func TestReaddirRemoveRace(t *testing.T) {
   182  	oldStat := *LstatP
   183  	defer func() { *LstatP = oldStat }()
   184  	*LstatP = func(name string) (FileInfo, error) {
   185  		if strings.HasSuffix(name, "some-file") {
   186  			// Act like it's been deleted.
   187  			return nil, ErrNotExist
   188  		}
   189  		return oldStat(name)
   190  	}
   191  	dir := newDir("TestReaddirRemoveRace", t)
   192  	defer RemoveAll(dir)
   193  	if err := os.WriteFile(filepath.Join(dir, "some-file"), []byte("hello"), 0644); err != nil {
   194  		t.Fatal(err)
   195  	}
   196  	d, err := Open(dir)
   197  	if err != nil {
   198  		t.Fatal(err)
   199  	}
   200  	defer d.Close()
   201  	fis, err := d.Readdir(2) // notably, greater than zero
   202  	if len(fis) == 0 && err == nil {
   203  		// This is what used to happen (Issue 16919)
   204  		t.Fatal("Readdir = empty slice & err == nil")
   205  	}
   206  	if len(fis) != 0 || err != io.EOF {
   207  		t.Errorf("Readdir = %d entries: %v; want 0, io.EOF", len(fis), err)
   208  		for i, fi := range fis {
   209  			t.Errorf("  entry[%d]: %q, %v", i, fi.Name(), fi.Mode())
   210  		}
   211  		t.FailNow()
   212  	}
   213  }
   214  
   215  // Issue 23120: respect umask when doing Mkdir with the sticky bit
   216  func TestMkdirStickyUmask(t *testing.T) {
   217  	const umask = 0077
   218  	dir := newDir("TestMkdirStickyUmask", t)
   219  	defer RemoveAll(dir)
   220  	oldUmask := syscall.Umask(umask)
   221  	defer syscall.Umask(oldUmask)
   222  	p := filepath.Join(dir, "dir1")
   223  	if err := Mkdir(p, ModeSticky|0755); err != nil {
   224  		t.Fatal(err)
   225  	}
   226  	fi, err := Stat(p)
   227  	if err != nil {
   228  		t.Fatal(err)
   229  	}
   230  	if mode := fi.Mode(); (mode&umask) != 0 || (mode&^ModePerm) != (ModeDir|ModeSticky) {
   231  		t.Errorf("unexpected mode %s", mode)
   232  	}
   233  }
   234  
   235  // See also issues: 22939, 24331
   236  func newFileTest(t *testing.T, blocking bool) {
   237  	if runtime.GOOS == "js" {
   238  		t.Skipf("syscall.Pipe is not available on %s.", runtime.GOOS)
   239  	}
   240  
   241  	p := make([]int, 2)
   242  	if err := syscall.Pipe(p); err != nil {
   243  		t.Fatalf("pipe: %v", err)
   244  	}
   245  	defer syscall.Close(p[1])
   246  
   247  	// Set the read-side to non-blocking.
   248  	if !blocking {
   249  		if err := syscall.SetNonblock(p[0], true); err != nil {
   250  			syscall.Close(p[0])
   251  			t.Fatalf("SetNonblock: %v", err)
   252  		}
   253  	}
   254  	// Convert it to a file.
   255  	file := NewFile(uintptr(p[0]), "notapipe")
   256  	if file == nil {
   257  		syscall.Close(p[0])
   258  		t.Fatalf("failed to convert fd to file!")
   259  	}
   260  	defer file.Close()
   261  
   262  	timeToWrite := 100 * time.Millisecond
   263  	timeToDeadline := 1 * time.Millisecond
   264  	if !blocking {
   265  		// Use a longer time to avoid flakes.
   266  		// We won't be waiting this long anyhow.
   267  		timeToWrite = 1 * time.Second
   268  	}
   269  
   270  	// Try to read with deadline (but don't block forever).
   271  	b := make([]byte, 1)
   272  	timer := time.AfterFunc(timeToWrite, func() { syscall.Write(p[1], []byte("a")) })
   273  	defer timer.Stop()
   274  	file.SetReadDeadline(time.Now().Add(timeToDeadline))
   275  	_, err := file.Read(b)
   276  	if !blocking {
   277  		// We want it to fail with a timeout.
   278  		if !isDeadlineExceeded(err) {
   279  			t.Fatalf("No timeout reading from file: %v", err)
   280  		}
   281  	} else {
   282  		// We want it to succeed after 100ms
   283  		if err != nil {
   284  			t.Fatalf("Error reading from file: %v", err)
   285  		}
   286  	}
   287  }
   288  
   289  func TestNewFileBlock(t *testing.T) {
   290  	t.Parallel()
   291  	newFileTest(t, true)
   292  }
   293  
   294  func TestNewFileNonBlock(t *testing.T) {
   295  	t.Parallel()
   296  	newFileTest(t, false)
   297  }
   298  
   299  func TestSplitPath(t *testing.T) {
   300  	t.Parallel()
   301  	for _, tt := range []struct{ path, wantDir, wantBase string }{
   302  		{"a", ".", "a"},
   303  		{"a/", ".", "a"},
   304  		{"a//", ".", "a"},
   305  		{"a/b", "a", "b"},
   306  		{"a/b/", "a", "b"},
   307  		{"a/b/c", "a/b", "c"},
   308  		{"/a", "/", "a"},
   309  		{"/a/", "/", "a"},
   310  		{"/a/b", "/a", "b"},
   311  		{"/a/b/", "/a", "b"},
   312  		{"/a/b/c", "/a/b", "c"},
   313  		{"//a", "/", "a"},
   314  		{"//a/", "/", "a"},
   315  		{"///a", "/", "a"},
   316  		{"///a/", "/", "a"},
   317  	} {
   318  		if dir, base := SplitPath(tt.path); dir != tt.wantDir || base != tt.wantBase {
   319  			t.Errorf("splitPath(%q) = %q, %q, want %q, %q", tt.path, dir, base, tt.wantDir, tt.wantBase)
   320  		}
   321  	}
   322  }
   323
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