1 files changed, 292 insertions, 0 deletions
diff --git a/src/os/stat_test.go b/src/os/stat_test.go
new file mode 100644
index 0000000..c409f0f
--- /dev/null
+++ b/src/os/stat_test.go
@@ -0,0 +1,292 @@
+// Copyright 2018 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.
+
+package os_test
+
+import (
+	"internal/testenv"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+// testStatAndLstat verifies that all os.Stat, os.Lstat os.File.Stat and os.Readdir work.
+func testStatAndLstat(t *testing.T, path string, isLink bool, statCheck, lstatCheck func(*testing.T, string, fs.FileInfo)) {
+	// test os.Stat
+	sfi, err := os.Stat(path)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	statCheck(t, path, sfi)
+
+	// test os.Lstat
+	lsfi, err := os.Lstat(path)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	lstatCheck(t, path, lsfi)
+
+	if isLink {
+		if os.SameFile(sfi, lsfi) {
+			t.Errorf("stat and lstat of %q should not be the same", path)
+		}
+	} else {
+		if !os.SameFile(sfi, lsfi) {
+			t.Errorf("stat and lstat of %q should be the same", path)
+		}
+	}
+
+	// test os.File.Stat
+	f, err := os.Open(path)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer f.Close()
+
+	sfi2, err := f.Stat()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	statCheck(t, path, sfi2)
+
+	if !os.SameFile(sfi, sfi2) {
+		t.Errorf("stat of open %q file and stat of %q should be the same", path, path)
+	}
+
+	if isLink {
+		if os.SameFile(sfi2, lsfi) {
+			t.Errorf("stat of opened %q file and lstat of %q should not be the same", path, path)
+		}
+	} else {
+		if !os.SameFile(sfi2, lsfi) {
+			t.Errorf("stat of opened %q file and lstat of %q should be the same", path, path)
+		}
+	}
+
+	// test fs.FileInfo returned by os.Readdir
+	if len(path) > 0 && os.IsPathSeparator(path[len(path)-1]) {
+		// skip os.Readdir test of directories with slash at the end
+		return
+	}
+	parentdir := filepath.Dir(path)
+	parent, err := os.Open(parentdir)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer parent.Close()
+
+	fis, err := parent.Readdir(-1)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	var lsfi2 fs.FileInfo
+	base := filepath.Base(path)
+	for _, fi2 := range fis {
+		if fi2.Name() == base {
+			lsfi2 = fi2
+			break
+		}
+	}
+	if lsfi2 == nil {
+		t.Errorf("failed to find %q in its parent", path)
+		return
+	}
+	lstatCheck(t, path, lsfi2)
+
+	if !os.SameFile(lsfi, lsfi2) {
+		t.Errorf("lstat of %q file in %q directory and %q should be the same", lsfi2.Name(), parentdir, path)
+	}
+}
+
+// testIsDir verifies that fi refers to directory.
+func testIsDir(t *testing.T, path string, fi fs.FileInfo) {
+	t.Helper()
+	if !fi.IsDir() {
+		t.Errorf("%q should be a directory", path)
+	}
+	if fi.Mode()&fs.ModeSymlink != 0 {
+		t.Errorf("%q should not be a symlink", path)
+	}
+}
+
+// testIsSymlink verifies that fi refers to symlink.
+func testIsSymlink(t *testing.T, path string, fi fs.FileInfo) {
+	t.Helper()
+	if fi.IsDir() {
+		t.Errorf("%q should not be a directory", path)
+	}
+	if fi.Mode()&fs.ModeSymlink == 0 {
+		t.Errorf("%q should be a symlink", path)
+	}
+}
+
+// testIsFile verifies that fi refers to file.
+func testIsFile(t *testing.T, path string, fi fs.FileInfo) {
+	t.Helper()
+	if fi.IsDir() {
+		t.Errorf("%q should not be a directory", path)
+	}
+	if fi.Mode()&fs.ModeSymlink != 0 {
+		t.Errorf("%q should not be a symlink", path)
+	}
+}
+
+func testDirStats(t *testing.T, path string) {
+	testStatAndLstat(t, path, false, testIsDir, testIsDir)
+}
+
+func testFileStats(t *testing.T, path string) {
+	testStatAndLstat(t, path, false, testIsFile, testIsFile)
+}
+
+func testSymlinkStats(t *testing.T, path string, isdir bool) {
+	if isdir {
+		testStatAndLstat(t, path, true, testIsDir, testIsSymlink)
+	} else {
+		testStatAndLstat(t, path, true, testIsFile, testIsSymlink)
+	}
+}
+
+func testSymlinkSameFile(t *testing.T, path, link string) {
+	pathfi, err := os.Stat(path)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	linkfi, err := os.Stat(link)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	if !os.SameFile(pathfi, linkfi) {
+		t.Errorf("os.Stat(%q) and os.Stat(%q) are not the same file", path, link)
+	}
+
+	linkfi, err = os.Lstat(link)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	if os.SameFile(pathfi, linkfi) {
+		t.Errorf("os.Stat(%q) and os.Lstat(%q) are the same file", path, link)
+	}
+}
+
+func TestDirAndSymlinkStats(t *testing.T) {
+	testenv.MustHaveSymlink(t)
+
+	tmpdir, err := os.MkdirTemp("", "TestDirAndSymlinkStats")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	dir := filepath.Join(tmpdir, "dir")
+	err = os.Mkdir(dir, 0777)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testDirStats(t, dir)
+
+	dirlink := filepath.Join(tmpdir, "link")
+	err = os.Symlink(dir, dirlink)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testSymlinkStats(t, dirlink, true)
+	testSymlinkSameFile(t, dir, dirlink)
+
+	linklink := filepath.Join(tmpdir, "linklink")
+	err = os.Symlink(dirlink, linklink)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testSymlinkStats(t, linklink, true)
+	testSymlinkSameFile(t, dir, linklink)
+}
+
+func TestFileAndSymlinkStats(t *testing.T) {
+	testenv.MustHaveSymlink(t)
+
+	tmpdir, err := os.MkdirTemp("", "TestFileAndSymlinkStats")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	file := filepath.Join(tmpdir, "file")
+	err = os.WriteFile(file, []byte(""), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testFileStats(t, file)
+
+	filelink := filepath.Join(tmpdir, "link")
+	err = os.Symlink(file, filelink)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testSymlinkStats(t, filelink, false)
+	testSymlinkSameFile(t, file, filelink)
+
+	linklink := filepath.Join(tmpdir, "linklink")
+	err = os.Symlink(filelink, linklink)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testSymlinkStats(t, linklink, false)
+	testSymlinkSameFile(t, file, linklink)
+}
+
+// see issue 27225 for details
+func TestSymlinkWithTrailingSlash(t *testing.T) {
+	testenv.MustHaveSymlink(t)
+
+	tmpdir, err := os.MkdirTemp("", "TestSymlinkWithTrailingSlash")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	dir := filepath.Join(tmpdir, "dir")
+	err = os.Mkdir(dir, 0777)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dirlink := filepath.Join(tmpdir, "link")
+	err = os.Symlink(dir, dirlink)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dirlinkWithSlash := dirlink + string(os.PathSeparator)
+
+	if runtime.GOOS == "windows" {
+		testSymlinkStats(t, dirlinkWithSlash, true)
+	} else {
+		testDirStats(t, dirlinkWithSlash)
+	}
+
+	fi1, err := os.Stat(dir)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	fi2, err := os.Stat(dirlinkWithSlash)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	if !os.SameFile(fi1, fi2) {
+		t.Errorf("os.Stat(%q) and os.Stat(%q) are not the same file", dir, dirlinkWithSlash)
+	}
+}