func TestMountOptionSubtype(t *testing.T) {
	if runtime.GOOS == "darwin" {
		t.Skip("OS X does not support Subtype")
	}
	if runtime.GOOS == "freebsd" {
		t.Skip("FreeBSD does not support Subtype")
	}
	t.Parallel()
	const name = "FuseTestMarker"
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.Dir{}},
		fuse.Subtype(name),
	)
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	info, err := fstestutil.GetMountInfo(mnt.Dir)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := info.Type, "fuse."+name; g != e {
		t.Errorf("wrong Subtype: %q != %q", g, e)
	}
}

func TestMountOptionReadOnly(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t,
		fstestutil.SimpleFS{createrDir{}},
		fuse.ReadOnly(),
	)

	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// This will be prevented by kernel-level access checking when
	// ReadOnly is used.
	f, err := os.Create(mnt.Dir + "/child")
	if err == nil {
		f.Close()
		t.Fatal("expected an error")
	}
	perr, ok := err.(*os.PathError)
	if !ok {
		t.Fatalf("expected PathError, got %T: %v", err, err)
	}
	if perr.Err != syscall.EROFS {
		t.Fatalf("expected EROFS, got %T: %v", err, err)
	}
}

func TestSymlink(t *testing.T) {
	t.Parallel()
	f := &symlink1{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	const target = "/some-target"

	err = os.Symlink(target, mnt.Dir+"/symlink.file")
	if err != nil {
		t.Fatalf("os.Symlink: %v", err)
	}

	want := fuse.SymlinkRequest{NewName: "symlink.file", Target: target}
	if g, e := f.RecordedSymlink(), want; g != e {
		t.Errorf("symlink saw %+v, want %+v", g, e)
	}

	gotName, err := os.Readlink(mnt.Dir + "/symlink.file")
	if err != nil {
		t.Fatalf("os.Readlink: %v", err)
	}
	if gotName != target {
		t.Errorf("os.Readlink = %q; want %q", gotName, target)
	}
}

func TestMmap(t *testing.T) {

	w := &mmap{}
	w.data = make([]byte, mmapSize)
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": w}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// Run the mmap-using parts of the test in a subprocess, to avoid
	// an intentional page fault hanging the whole process (because it
	// would need to be served by the same process, and there might
	// not be a thread free to do that). Merely bumping GOMAXPROCS is
	// not enough to prevent the hangs reliably.
	child, err := childCmd("mmap")
	if err != nil {
		t.Fatal(err)
	}
	child.Dir = mnt.Dir
	if err := child.Run(); err != nil {
		t.Fatal(err)
	}

	got := w.bytes()
	if g, e := len(got), mmapSize; g != e {
		t.Fatalf("bad write length: %d != %d", g, e)
	}
	for i, g := range got {
		// default '\x00' for writes[i] is good here
		if e := mmapWrites[i]; g != e {
			t.Errorf("wrong byte at offset %d: %q != %q", i, g, e)
		}
	}
}

func TestMountOptionDefaultPermissions(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		t.Skip("FreeBSD does not support DefaultPermissions")
	}
	t.Parallel()
	mnt, err := fstestutil.MountedT(t,
		fstestutil.SimpleFS{
			fstestutil.ChildMap{"child": unwritableFile{}},
		},
		fuse.DefaultPermissions(),
	)

	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// This will be prevented by kernel-level access checking when
	// DefaultPermissions is used.
	f, err := os.OpenFile(mnt.Dir+"/child", os.O_WRONLY, 0000)
	if err == nil {
		f.Close()
		t.Fatal("expected an error")
	}
	if !os.IsPermission(err) {
		t.Fatalf("expected a permission error, got %T: %v", err, err)
	}
}

func testFtruncate(t *testing.T, toSize int64) {
	t.Parallel()
	f := &ftruncate{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": f}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	{
		fil, err := os.OpenFile(mnt.Dir+"/child", os.O_WRONLY, 0666)
		if err != nil {
			t.Error(err)
			return
		}
		defer fil.Close()

		err = fil.Truncate(toSize)
		if err != nil {
			t.Fatalf("Ftruncate: %v", err)
		}
	}
	gotr := f.RecordedSetattr()
	if gotr == (fuse.SetattrRequest{}) {
		t.Fatalf("no recorded SetattrRequest")
	}
	if g, e := gotr.Size, uint64(toSize); g != e {
		t.Errorf("got Size = %q; want %q", g, e)
	}
	if g, e := gotr.Valid&^fuse.SetattrLockOwner, fuse.SetattrHandle|fuse.SetattrSize; g != e {
		t.Errorf("got Valid = %q; want %q", g, e)
	}
	t.Logf("Got request: %#v", gotr)
}

func TestStatRoot(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t, root{})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	fi, err := os.Stat(mnt.Dir)
	if err != nil {
		t.Fatalf("root getattr failed with %v", err)
	}
	mode := fi.Mode()
	if (mode & os.ModeType) != os.ModeDir {
		t.Errorf("root is not a directory: %#v", fi)
	}
	if mode.Perm() != 0555 {
		t.Errorf("root has weird access mode: %v", mode.Perm())
	}
	switch stat := fi.Sys().(type) {
	case *syscall.Stat_t:
		if stat.Ino != 1 {
			t.Errorf("root has wrong inode: %v", stat.Ino)
		}
		if stat.Nlink != 1 {
			t.Errorf("root has wrong link count: %v", stat.Nlink)
		}
		if stat.Uid != 0 {
			t.Errorf("root has wrong uid: %d", stat.Uid)
		}
		if stat.Gid != 0 {
			t.Errorf("root has wrong gid: %d", stat.Gid)
		}
	}
}

func TestListxattr(t *testing.T) {
	t.Parallel()
	f := &listxattr{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": f}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	buf := make([]byte, 8192)
	n, err := syscallx.Listxattr(mnt.Dir+"/child", buf)
	if err != nil {
		t.Errorf("unexpected error: %v", err)
		return
	}
	buf = buf[:n]
	if g, e := string(buf), "one\x00two\x00"; g != e {
		t.Errorf("wrong listxattr content: %#v != %#v", g, e)
	}

	want := fuse.ListxattrRequest{
		Size: 8192,
	}
	if g, e := f.RecordedListxattr(), want; g != e {
		t.Fatalf("listxattr saw %+v, want %+v", g, e)
	}
}

func TestCreateWriteRemove(t *testing.T) {
	t.Parallel()
	f := &create3{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	err = ioutil.WriteFile(mnt.Dir+"/foo", []byte(hi), 0666)
	if err != nil {
		t.Fatalf("create3 WriteFile: %v", err)
	}
	if got := string(f.f.RecordedWriteData()); got != hi {
		t.Fatalf("create3 write = %q, want %q", got, hi)
	}

	err = os.Remove(mnt.Dir + "/foo")
	if err != nil {
		t.Fatalf("Remove: %v", err)
	}
	err = os.Remove(mnt.Dir + "/foo")
	if err == nil {
		t.Fatalf("second Remove = nil; want some error")
	}
}

func TestCreate(t *testing.T) {
	t.Parallel()
	f := &create1{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// uniform umask needed to make os.Create's 0666 into something
	// reproducible
	defer syscall.Umask(syscall.Umask(0022))
	ff, err := os.Create(mnt.Dir + "/foo")
	if err != nil {
		t.Fatalf("create1 WriteFile: %v", err)
	}
	defer ff.Close()

	err = syscall.Fsync(int(ff.Fd()))
	if err != nil {
		t.Fatalf("Fsync = %v", err)
	}

	if f.f.RecordedFsync() == (fuse.FsyncRequest{}) {
		t.Errorf("never received expected fsync call")
	}

	ff.Close()
}

func TestDirectWrite(t *testing.T) {
	t.Parallel()
	w := &directWrite{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": w}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	f, err := os.OpenFile(mnt.Dir+"/child", os.O_RDWR, 0666)
	if err != nil {
		t.Fatalf("Create: %v", err)
	}
	defer f.Close()
	n, err := f.Write([]byte(hi))
	if err != nil {
		t.Fatalf("Write: %v", err)
	}
	if n != len(hi) {
		t.Fatalf("short write; n=%d; hi=%d", n, len(hi))
	}

	err = f.Close()
	if err != nil {
		t.Fatalf("Close: %v", err)
	}

	if got := string(w.RecordedWriteData()); got != hi {
		t.Errorf("write = %q, want %q", got, hi)
	}
}

func TestReadDirAll(t *testing.T) {
	t.Parallel()
	f := &readDirAll{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	fil, err := os.Open(mnt.Dir)
	if err != nil {
		t.Error(err)
		return
	}
	defer fil.Close()

	// go Readdir is just Readdirnames + Lstat, there's no point in
	// testing that here; we have no consumption API for the real
	// dirent data
	names, err := fil.Readdirnames(100)
	if err != nil {
		t.Error(err)
		return
	}

	t.Logf("Got readdir: %q", names)

	if len(names) != 3 ||
		names[0] != "one" ||
		names[1] != "three" ||
		names[2] != "two" {
		t.Errorf(`expected 3 entries of "one", "three", "two", got: %q`, names)
		return
	}
}

func TestTruncateWithOpen(t *testing.T) {
	t.Parallel()
	f := &truncateWithOpen{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": f}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	fil, err := os.OpenFile(mnt.Dir+"/child", os.O_WRONLY|os.O_TRUNC, 0666)
	if err != nil {
		t.Error(err)
		return
	}
	fil.Close()

	gotr := f.RecordedSetattr()
	if gotr == (fuse.SetattrRequest{}) {
		t.Fatalf("no recorded SetattrRequest")
	}
	if g, e := gotr.Size, uint64(0); g != e {
		t.Errorf("got Size = %q; want %q", g, e)
	}
	// osxfuse sets SetattrHandle here, linux does not
	if g, e := gotr.Valid&^(fuse.SetattrLockOwner|fuse.SetattrHandle), fuse.SetattrSize; g != e {
		t.Errorf("got Valid = %q; want %q", g, e)
	}
	t.Logf("Got request: %#v", gotr)
}

func TestMknod(t *testing.T) {
	t.Parallel()
	if os.Getuid() != 0 {
		t.Skip("skipping unless root")
	}

	f := &mknod1{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	defer syscall.Umask(syscall.Umask(0))
	err = syscall.Mknod(mnt.Dir+"/node", syscall.S_IFIFO|0666, 123)
	if err != nil {
		t.Fatalf("Mknod: %v", err)
	}

	want := fuse.MknodRequest{
		Name: "node",
		Mode: os.FileMode(os.ModeNamedPipe | 0666),
		Rdev: uint32(123),
	}
	if runtime.GOOS == "linux" {
		// Linux fuse doesn't echo back the rdev if the node
		// isn't a device (we're using a FIFO here, as that
		// bit is portable.)
		want.Rdev = 0
	}
	if g, e := f.RecordedMknod(), want; g != e {
		t.Fatalf("mknod saw %+v, want %+v", g, e)
	}
}

func TestAttrBad(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": attrBad{}}})

	_, err = os.Stat(mnt.Dir + "/child")
	if nerr, ok := err.(*os.PathError); !ok || nerr.Err != syscall.ENAMETOOLONG {
		t.Fatalf("wrong error: %v", err)
	}
}

func TestInterrupt(t *testing.T) {
	t.Parallel()
	f := &interrupt{}
	f.hanging = make(chan struct{}, 1)
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": f}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// start a subprocess that can hang until signaled
	cmd := exec.Command("cat", mnt.Dir+"/child")

	err = cmd.Start()
	if err != nil {
		t.Errorf("interrupt: cannot start cat: %v", err)
		return
	}

	// try to clean up if child is still alive when returning
	defer cmd.Process.Kill()

	// wait till we're sure it's hanging in read
	<-f.hanging

	err = cmd.Process.Signal(os.Interrupt)
	if err != nil {
		t.Errorf("interrupt: cannot interrupt cat: %v", err)
		return
	}

	p, err := cmd.Process.Wait()
	if err != nil {
		t.Errorf("interrupt: cat bork: %v", err)
		return
	}
	switch ws := p.Sys().(type) {
	case syscall.WaitStatus:
		if ws.CoreDump() {
			t.Errorf("interrupt: didn't expect cat to dump core: %v", ws)
		}

		if ws.Exited() {
			t.Errorf("interrupt: didn't expect cat to exit normally: %v", ws)
		}

		if !ws.Signaled() {
			t.Errorf("interrupt: expected cat to get a signal: %v", ws)
		} else {
			if ws.Signal() != os.Interrupt {
				t.Errorf("interrupt: cat got wrong signal: %v", ws)
			}
		}
	default:
		t.Logf("interrupt: this platform has no test coverage")
	}
}

func TestReadAllWithHandleRead(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": readWithHandleRead{}}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	testReadAll(t, mnt.Dir+"/child")
}

func TestMountOptionAllowRootThenAllowOther(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.Dir{}},
		fuse.AllowRoot(),
		fuse.AllowOther(),
	)
	if err == nil {
		mnt.Close()
	}
	if g, e := err, fuse.ErrCannotCombineAllowOtherAndAllowRoot; g != e {
		t.Fatalf("wrong error: %v != %v", g, e)
	}
}

func TestPanic(t *testing.T) {
	t.Parallel()
	mnt, err := fstestutil.MountedT(t, testPanic{})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	var st syscall.Statfs_t
	err = syscall.Statfs(mnt.Dir, &st)
	if g, e := err, syscall.ENAMETOOLONG; g != e {
		t.Fatalf("wrong error from panicking handler: %v != %v", g, e)
	}
}

func TestOpen(t *testing.T) {
	t.Parallel()
	f := &open{}
	mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": f}})
	if err != nil {
		t.Fatal(err)
	}
	defer mnt.Close()

	// node: mode only matters with O_CREATE
	fil, err := os.OpenFile(mnt.Dir+"/child", os.O_WRONLY|os.O_APPEND, 0)
	if err == nil {
		t.Error("Open err == nil, expected ENAMETOOLONG")
		fil.Close()
		return
	}

	switch err2 := err.(type) {
	case *os.PathError:
		if err2.Err == syscall.ENAMETOOLONG {
			break
		}
		t.Errorf("unexpected inner error: %#v", err2)
	default:
		t.Errorf("unexpected error: %v", err)
	}

	want := fuse.OpenRequest{Dir: false, Flags: fuse.OpenWriteOnly | fuse.OpenAppend}
	if runtime.GOOS == "darwin" {
		// osxfuse does not let O_APPEND through at all
		//
		// https://code.google.com/p/macfuse/issues/detail?id=233
		// https://code.google.com/p/macfuse/issues/detail?id=132
		// https://code.google.com/p/macfuse/issues/detail?id=133
		want.Flags &^= fuse.OpenAppend
	}
	got := f.RecordedOpen()

	if runtime.GOOS == "linux" {
		// Linux <3.7 accidentally leaks O_CLOEXEC through to FUSE;
		// avoid spurious test failures
		got.Flags &^= fuse.OpenFlags(syscall.O_CLOEXEC)
	}

	if g, e := got, want; g != e {
		t.Errorf("open saw %v, want %v", g, e)
		return
	}
}