1 files changed, 322 insertions, 0 deletions
diff --git a/src/os/os_unix_test.go b/src/os/os_unix_test.go
new file mode 100644
index 0000000..c3c703f
--- /dev/null
+++ b/src/os/os_unix_test.go
@@ -0,0 +1,322 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix || (js && wasm)
+
+package os_test
+
+import (
+	"io"
+	"os"
+	. "os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+)
+
+func init() {
+	isReadonlyError = func(err error) bool { return err == syscall.EROFS }
+}
+
+// For TestRawConnReadWrite.
+type syscallDescriptor = int
+
+func checkUidGid(t *testing.T, path string, uid, gid int) {
+	dir, err := Lstat(path)
+	if err != nil {
+		t.Fatalf("Lstat %q (looking for uid/gid %d/%d): %s", path, uid, gid, err)
+	}
+	sys := dir.Sys().(*syscall.Stat_t)
+	if int(sys.Uid) != uid {
+		t.Errorf("Lstat %q: uid %d want %d", path, sys.Uid, uid)
+	}
+	if int(sys.Gid) != gid {
+		t.Errorf("Lstat %q: gid %d want %d", path, sys.Gid, gid)
+	}
+}
+
+func TestChown(t *testing.T) {
+	// Use TempDir() to make sure we're on a local file system,
+	// so that the group ids returned by Getgroups will be allowed
+	// on the file. On NFS, the Getgroups groups are
+	// basically useless.
+	f := newFile("TestChown", t)
+	defer Remove(f.Name())
+	defer f.Close()
+	dir, err := f.Stat()
+	if err != nil {
+		t.Fatalf("stat %s: %s", f.Name(), err)
+	}
+
+	// Can't change uid unless root, but can try
+	// changing the group id. First try our current group.
+	gid := Getgid()
+	t.Log("gid:", gid)
+	if err = Chown(f.Name(), -1, gid); err != nil {
+		t.Fatalf("chown %s -1 %d: %s", f.Name(), gid, err)
+	}
+	sys := dir.Sys().(*syscall.Stat_t)
+	checkUidGid(t, f.Name(), int(sys.Uid), gid)
+
+	// Then try all the auxiliary groups.
+	groups, err := Getgroups()
+	if err != nil {
+		t.Fatalf("getgroups: %s", err)
+	}
+	t.Log("groups: ", groups)
+	for _, g := range groups {
+		if err = Chown(f.Name(), -1, g); err != nil {
+			t.Fatalf("chown %s -1 %d: %s", f.Name(), g, err)
+		}
+		checkUidGid(t, f.Name(), int(sys.Uid), g)
+
+		// change back to gid to test fd.Chown
+		if err = f.Chown(-1, gid); err != nil {
+			t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
+		}
+		checkUidGid(t, f.Name(), int(sys.Uid), gid)
+	}
+}
+
+func TestFileChown(t *testing.T) {
+	// Use TempDir() to make sure we're on a local file system,
+	// so that the group ids returned by Getgroups will be allowed
+	// on the file. On NFS, the Getgroups groups are
+	// basically useless.
+	f := newFile("TestFileChown", t)
+	defer Remove(f.Name())
+	defer f.Close()
+	dir, err := f.Stat()
+	if err != nil {
+		t.Fatalf("stat %s: %s", f.Name(), err)
+	}
+
+	// Can't change uid unless root, but can try
+	// changing the group id. First try our current group.
+	gid := Getgid()
+	t.Log("gid:", gid)
+	if err = f.Chown(-1, gid); err != nil {
+		t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
+	}
+	sys := dir.Sys().(*syscall.Stat_t)
+	checkUidGid(t, f.Name(), int(sys.Uid), gid)
+
+	// Then try all the auxiliary groups.
+	groups, err := Getgroups()
+	if err != nil {
+		t.Fatalf("getgroups: %s", err)
+	}
+	t.Log("groups: ", groups)
+	for _, g := range groups {
+		if err = f.Chown(-1, g); err != nil {
+			t.Fatalf("fchown %s -1 %d: %s", f.Name(), g, err)
+		}
+		checkUidGid(t, f.Name(), int(sys.Uid), g)
+
+		// change back to gid to test fd.Chown
+		if err = f.Chown(-1, gid); err != nil {
+			t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
+		}
+		checkUidGid(t, f.Name(), int(sys.Uid), gid)
+	}
+}
+
+func TestLchown(t *testing.T) {
+	// Use TempDir() to make sure we're on a local file system,
+	// so that the group ids returned by Getgroups will be allowed
+	// on the file. On NFS, the Getgroups groups are
+	// basically useless.
+	f := newFile("TestLchown", t)
+	defer Remove(f.Name())
+	defer f.Close()
+	dir, err := f.Stat()
+	if err != nil {
+		t.Fatalf("stat %s: %s", f.Name(), err)
+	}
+
+	linkname := f.Name() + "2"
+	if err := Symlink(f.Name(), linkname); err != nil {
+		if runtime.GOOS == "android" && IsPermission(err) {
+			t.Skip("skipping test on Android; permission error creating symlink")
+		}
+		t.Fatalf("link %s -> %s: %v", f.Name(), linkname, err)
+	}
+	defer Remove(linkname)
+
+	// Can't change uid unless root, but can try
+	// changing the group id. First try our current group.
+	gid := Getgid()
+	t.Log("gid:", gid)
+	if err = Lchown(linkname, -1, gid); err != nil {
+		if err, ok := err.(*PathError); ok && err.Err == syscall.ENOSYS {
+			t.Skip("lchown is unavailable")
+		}
+		t.Fatalf("lchown %s -1 %d: %s", linkname, gid, err)
+	}
+	sys := dir.Sys().(*syscall.Stat_t)
+	checkUidGid(t, linkname, int(sys.Uid), gid)
+
+	// Then try all the auxiliary groups.
+	groups, err := Getgroups()
+	if err != nil {
+		t.Fatalf("getgroups: %s", err)
+	}
+	t.Log("groups: ", groups)
+	for _, g := range groups {
+		if err = Lchown(linkname, -1, g); err != nil {
+			t.Fatalf("lchown %s -1 %d: %s", linkname, g, err)
+		}
+		checkUidGid(t, linkname, int(sys.Uid), g)
+
+		// Check that link target's gid is unchanged.
+		checkUidGid(t, f.Name(), int(sys.Uid), int(sys.Gid))
+	}
+}
+
+// Issue 16919: Readdir must return a non-empty slice or an error.
+func TestReaddirRemoveRace(t *testing.T) {
+	oldStat := *LstatP
+	defer func() { *LstatP = oldStat }()
+	*LstatP = func(name string) (FileInfo, error) {
+		if strings.HasSuffix(name, "some-file") {
+			// Act like it's been deleted.
+			return nil, ErrNotExist
+		}
+		return oldStat(name)
+	}
+	dir := newDir("TestReaddirRemoveRace", t)
+	defer RemoveAll(dir)
+	if err := os.WriteFile(filepath.Join(dir, "some-file"), []byte("hello"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	d, err := Open(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer d.Close()
+	fis, err := d.Readdir(2) // notably, greater than zero
+	if len(fis) == 0 && err == nil {
+		// This is what used to happen (Issue 16919)
+		t.Fatal("Readdir = empty slice & err == nil")
+	}
+	if len(fis) != 0 || err != io.EOF {
+		t.Errorf("Readdir = %d entries: %v; want 0, io.EOF", len(fis), err)
+		for i, fi := range fis {
+			t.Errorf("  entry[%d]: %q, %v", i, fi.Name(), fi.Mode())
+		}
+		t.FailNow()
+	}
+}
+
+// Issue 23120: respect umask when doing Mkdir with the sticky bit
+func TestMkdirStickyUmask(t *testing.T) {
+	const umask = 0077
+	dir := newDir("TestMkdirStickyUmask", t)
+	defer RemoveAll(dir)
+	oldUmask := syscall.Umask(umask)
+	defer syscall.Umask(oldUmask)
+	p := filepath.Join(dir, "dir1")
+	if err := Mkdir(p, ModeSticky|0755); err != nil {
+		t.Fatal(err)
+	}
+	fi, err := Stat(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if mode := fi.Mode(); (mode&umask) != 0 || (mode&^ModePerm) != (ModeDir|ModeSticky) {
+		t.Errorf("unexpected mode %s", mode)
+	}
+}
+
+// See also issues: 22939, 24331
+func newFileTest(t *testing.T, blocking bool) {
+	if runtime.GOOS == "js" {
+		t.Skipf("syscall.Pipe is not available on %s.", runtime.GOOS)
+	}
+
+	p := make([]int, 2)
+	if err := syscall.Pipe(p); err != nil {
+		t.Fatalf("pipe: %v", err)
+	}
+	defer syscall.Close(p[1])
+
+	// Set the read-side to non-blocking.
+	if !blocking {
+		if err := syscall.SetNonblock(p[0], true); err != nil {
+			syscall.Close(p[0])
+			t.Fatalf("SetNonblock: %v", err)
+		}
+	}
+	// Convert it to a file.
+	file := NewFile(uintptr(p[0]), "notapipe")
+	if file == nil {
+		syscall.Close(p[0])
+		t.Fatalf("failed to convert fd to file!")
+	}
+	defer file.Close()
+
+	timeToWrite := 100 * time.Millisecond
+	timeToDeadline := 1 * time.Millisecond
+	if !blocking {
+		// Use a longer time to avoid flakes.
+		// We won't be waiting this long anyhow.
+		timeToWrite = 1 * time.Second
+	}
+
+	// Try to read with deadline (but don't block forever).
+	b := make([]byte, 1)
+	timer := time.AfterFunc(timeToWrite, func() { syscall.Write(p[1], []byte("a")) })
+	defer timer.Stop()
+	file.SetReadDeadline(time.Now().Add(timeToDeadline))
+	_, err := file.Read(b)
+	if !blocking {
+		// We want it to fail with a timeout.
+		if !isDeadlineExceeded(err) {
+			t.Fatalf("No timeout reading from file: %v", err)
+		}
+	} else {
+		// We want it to succeed after 100ms
+		if err != nil {
+			t.Fatalf("Error reading from file: %v", err)
+		}
+	}
+}
+
+func TestNewFileBlock(t *testing.T) {
+	t.Parallel()
+	newFileTest(t, true)
+}
+
+func TestNewFileNonBlock(t *testing.T) {
+	t.Parallel()
+	newFileTest(t, false)
+}
+
+func TestSplitPath(t *testing.T) {
+	t.Parallel()
+	for _, tt := range []struct{ path, wantDir, wantBase string }{
+		{"a", ".", "a"},
+		{"a/", ".", "a"},
+		{"a//", ".", "a"},
+		{"a/b", "a", "b"},
+		{"a/b/", "a", "b"},
+		{"a/b/c", "a/b", "c"},
+		{"/a", "/", "a"},
+		{"/a/", "/", "a"},
+		{"/a/b", "/a", "b"},
+		{"/a/b/", "/a", "b"},
+		{"/a/b/c", "/a/b", "c"},
+		{"//a", "/", "a"},
+		{"//a/", "/", "a"},
+		{"///a", "/", "a"},
+		{"///a/", "/", "a"},
+	} {
+		if dir, base := SplitPath(tt.path); dir != tt.wantDir || base != tt.wantBase {
+			t.Errorf("splitPath(%q) = %q, %q, want %q, %q", tt.path, dir, base, tt.wantDir, tt.wantBase)
+		}
+	}
+}