Golang FileSystem.Stat方法代码示例

func isFile(fs rwvfs.FileSystem, file string) bool {
	fi, err := fs.Stat(file)
	if err != nil {
		return false
	}
	return fi.Mode().IsRegular()
}

func PathDoesNotExist(t *testing.T, label string, fs rwvfs.FileSystem, path string) {
	fi, err := fs.Stat(path)
	if err != nil && !os.IsNotExist(err) {
		t.Errorf("%s: Stat(%q): want os.IsNotExist-satisfying error, got %q", label, path, err)
	} else if err == nil {
		t.Errorf("%s: Stat(%q): want file to not exist, got existing file with FileInfo %+v", label, path, fi)
	}
}

func testWrite(t *testing.T, fs rwvfs.FileSystem, path string) {
	label := fmt.Sprintf("%T", fs)

	w, err := fs.Create(path)
	if err != nil {
		t.Fatalf("%s: WriterOpen: %s", label, err)
	}

	input := []byte("qux")
	_, err = w.Write(input)
	if err != nil {
		t.Fatalf("%s: Write: %s", label, err)
	}

	err = w.Close()
	if err != nil {
		t.Fatalf("%s: w.Close: %s", label, err)
	}

	var r io.ReadCloser
	r, err = fs.Open(path)
	if err != nil {
		t.Fatalf("%s: Open: %s", label, err)
	}
	var output []byte
	output, err = ioutil.ReadAll(r)
	if err != nil {
		t.Fatalf("%s: ReadAll: %s", label, err)
	}
	if !bytes.Equal(output, input) {
		t.Errorf("%s: got output %q, want %q", label, output, input)
	}

	r, err = fs.Open(path)
	if err != nil {
		t.Fatalf("%s: Open: %s", label, err)
	}
	output, err = ioutil.ReadAll(r)
	if err != nil {
		t.Fatalf("%s: ReadAll: %s", label, err)
	}
	if !bytes.Equal(output, input) {
		t.Errorf("%s: got output %q, want %q", label, output, input)
	}

	if err := fs.Remove(path); err != nil {
		t.Errorf("%s: Remove(%q): %s", label, path, err)
	}
	time.Sleep(time.Second)

	fi, err := fs.Stat(path)
	if err != nil && !os.IsNotExist(err) {
		t.Errorf("%s: Stat(%q): want os.IsNotExist-satisfying error, got %q", label, path, err)
	} else if err == nil {
		t.Errorf("%s: Stat(%q): want file to not exist, got existing file with FileInfo %+v", label, path, fi)
	}
}

func IsFile(t *testing.T, label string, fs rwvfs.FileSystem, path string) {
	fi, err := fs.Stat(path)
	if err != nil {
		t.Fatalf("%s: Stat(%q): %s", label, path, err)
	}

	if !fi.Mode().IsRegular() {
		t.Errorf("%s: got fs.Stat(%q) Mode().IsRegular() == false, want true", label, path)
	}
}

func IsDir(t *testing.T, label string, fs rwvfs.FileSystem, path string) {
	fi, err := fs.Stat(path)
	if err != nil {
		t.Fatalf("%s: Stat(%q): %s", label, path, err)
	}

	if fi == nil {
		t.Fatalf("%s: FileInfo (%q) == nil", label, path)
	}

	if !fi.IsDir() {
		t.Errorf("%s: got fs.Stat(%q) IsDir() == false, want true", label, path)
	}
}

// statIndex calls fs.Stat on the index's backing file or dir.
func statIndex(fs rwvfs.FileSystem, name string) (os.FileInfo, error) {
	return fs.Stat(fmt.Sprintf(indexFilename, name))
}

func Mkdir(t *testing.T, fs rwvfs.FileSystem) {
	label := fmt.Sprintf("%T", fs)

	if strings.Contains(label, "subFS") {
		if err := fs.Mkdir("/"); err != nil && !os.IsExist(err) {
			t.Fatalf("%s: subFS Mkdir(/): %s", label, err)
		}
	}
	if strings.Contains(label, "mapFS") {
		if err := fs.Mkdir("/"); err != nil && !os.IsExist(err) {
			t.Fatalf("%s: mapFS Mkdir(/): %s", label, err)
		}
	}

	fi, err := fs.Stat(".")
	if err != nil {
		t.Fatalf("%s: Stat(.): %s", label, err)
	}
	if !fi.Mode().IsDir() {
		t.Fatalf("%s: got Stat(.) FileMode %o, want IsDir", label, fi.Mode())
	}

	fi, err = fs.Stat("/")
	if err != nil {
		t.Fatalf("%s: Stat(/): %s", label, err)
	}
	if !fi.Mode().IsDir() {
		t.Fatalf("%s: got Stat(/) FileMode %o, want IsDir", label, fi.Mode())
	}

	if _, err := fs.ReadDir("."); err != nil {
		t.Fatalf("%s: ReadDir(.): %s", label, err)
	}
	if _, err := fs.ReadDir("/"); err != nil {
		t.Fatalf("%s: ReadDir(/): %s", label, err)
	}

	fis, err := fs.ReadDir("/")
	if err != nil {
		t.Fatalf("%s: ReadDir(/): %s", label, err)
	}
	if len(fis) != 0 {
		t.Fatalf("%s: ReadDir(/): got %d file infos (%v), want none (is it including .?)", label, len(fis), fis)
	}

	err = fs.Mkdir("dir0")
	if err != nil {
		t.Fatalf("%s: Mkdir(dir0): %s", label, err)
	}
	IsDir(t, label, fs, "dir0")
	IsDir(t, label, fs, "/dir0")

	err = fs.Mkdir("/dir1")
	if err != nil {
		t.Fatalf("%s: Mkdir(/dir1): %s", label, err)
	}
	IsDir(t, label, fs, "dir1")
	IsDir(t, label, fs, "/dir1")

	err = fs.Mkdir("/dir1")
	if !os.IsExist(err) {
		t.Errorf("%s: Mkdir(/dir1) again: got err %v, want os.IsExist-satisfying error", label, err)
	}

	err = fs.Mkdir("/parent-doesnt-exist/dir2")
	if !os.IsNotExist(err) {
		t.Errorf("%s: Mkdir(/parent-doesnt-exist/dir2): got error %v, want os.IsNotExist-satisfying error", label, err)
	}

	err = fs.Remove("/dir1")
	if err != nil {
		t.Errorf("%s: Remove(/dir1): %s", label, err)
	}
	PathDoesNotExist(t, label, fs, "/dir1")
}

func testStat(t *testing.T, fs rwvfs.FileSystem, path string) {
	label := fmt.Sprintf("Stat %T", fs)

	cases := []struct {
		parent, child string
		checkDirs     []string
	}{
		{pathpkg.Join(path, "p"), pathpkg.Join(path, "p/c"), nil},
		{pathpkg.Join(path, "."), pathpkg.Join(path, "c"), nil},
		{pathpkg.Join(path, "p1/p2"), pathpkg.Join(path, "p1/p2/p3/c"), []string{"p1", "p1/p2/p3"}},
		{pathpkg.Join(path, "p1"), pathpkg.Join(path, "p1/p2/p3/c"), []string{"p1/p2", "p1/p2/p3"}},
	}

	// Clean out bucket.
	for _, x := range cases {
		removeFile(t, fs, x.parent)
		removeFile(t, fs, x.child)
	}
	removeFile(t, fs, path)

	if path != "." {
		if _, err := fs.Stat(path); !os.IsNotExist(err) {
			t.Fatalf("%s: Stat(%s): got error %v, want os.IsNotExist-satisfying", label, path, err)
		}
	}
	if _, err := fs.Stat(path + "/z"); !os.IsNotExist(err) {
		t.Fatalf("%s: Stat(%s): got error %v, want os.IsNotExist-satisfying", label, path+"/z", err)
	}

	// Not sure of the best way to treat S3 keys that are
	// delimiter-prefixes of other keys, since they can either be like
	// dirs or files. But let's just choose a way and add a test so we
	// can change the behavior easily later.

	for _, x := range cases {
		t.Logf("# parent %q, child %q", x.parent, x.child)

		createFile(t, fs, x.parent, []byte("x"))
		createFile(t, fs, x.child, []byte("x"))

		parentFI, err := fs.Stat(x.parent)
		if err != nil {
			t.Fatalf("%s: Stat(%s): %s", label, x.parent, err)
		}
		if !parentFI.Mode().IsDir() {
			t.Fatalf("%s: Stat(%s) got Mode().IsDir() == false, want true", label, x.parent)
		}

		childFI, err := fs.Stat(x.child)
		if err != nil {
			t.Fatalf("%s: Stat(%s): %s", label, x.child, err)
		}
		if !childFI.Mode().IsRegular() {
			t.Fatalf("%s: Stat(%s) got Mode().IsRegular() == false, want true", label, x.child)
		}

		// Should not exist.
		doesntExist := pathpkg.Join(x.child, "doesntexist")
		if _, err := fs.Stat(doesntExist); !os.IsNotExist(err) {
			t.Fatalf("%s: Stat(%s): got error %v, want os.IsNotExist-satisfying", label, doesntExist, err)
		}

		for _, dir := range x.checkDirs {
			dir = pathpkg.Join(path, dir)
			fi, err := fs.Stat(dir)
			if err != nil {
				t.Fatalf("%s: Stat(%s): %s", label, dir, err)
			}
			if !fi.Mode().IsDir() {
				t.Fatalf("%s: Stat(%s): not dir, want dir", label, dir)
			}
		}

		if x.parent != "." {
			// Check that the parent file can be opened like a file.
			f, err := fs.Open(x.parent)
			if err != nil {
				t.Fatalf("%s: Open(%s): %s", label, x.parent, err)
			}
			f.Close()
		}

		// Clean up
		if err := fs.Remove(x.parent); err != nil {
			t.Errorf("%s: Remove(%q): %s", label, x.parent, err)
		}
		if err := fs.Remove(x.child); err != nil {
			t.Errorf("%s: Remove(%q): %s", label, x.child, err)
		}
	}
}