1 files changed, 471 insertions, 0 deletions
diff --git a/src/os/removeall_test.go b/src/os/removeall_test.go
new file mode 100644
index 0000000..3a2f6e3
--- /dev/null
+++ b/src/os/removeall_test.go
@@ -0,0 +1,471 @@
+// 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 (
+	"fmt"
+	"os"
+	. "os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func TestRemoveAll(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "TestRemoveAll-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tmpDir)
+
+	if err := RemoveAll(""); err != nil {
+		t.Errorf("RemoveAll(\"\"): %v; want nil", err)
+	}
+
+	file := filepath.Join(tmpDir, "file")
+	path := filepath.Join(tmpDir, "_TestRemoveAll_")
+	fpath := filepath.Join(path, "file")
+	dpath := filepath.Join(path, "dir")
+
+	// Make a regular file and remove
+	fd, err := Create(file)
+	if err != nil {
+		t.Fatalf("create %q: %s", file, err)
+	}
+	fd.Close()
+	if err = RemoveAll(file); err != nil {
+		t.Fatalf("RemoveAll %q (first): %s", file, err)
+	}
+	if _, err = Lstat(file); err == nil {
+		t.Fatalf("Lstat %q succeeded after RemoveAll (first)", file)
+	}
+
+	// Make directory with 1 file and remove.
+	if err := MkdirAll(path, 0777); err != nil {
+		t.Fatalf("MkdirAll %q: %s", path, err)
+	}
+	fd, err = Create(fpath)
+	if err != nil {
+		t.Fatalf("create %q: %s", fpath, err)
+	}
+	fd.Close()
+	if err = RemoveAll(path); err != nil {
+		t.Fatalf("RemoveAll %q (second): %s", path, err)
+	}
+	if _, err = Lstat(path); err == nil {
+		t.Fatalf("Lstat %q succeeded after RemoveAll (second)", path)
+	}
+
+	// Make directory with file and subdirectory and remove.
+	if err = MkdirAll(dpath, 0777); err != nil {
+		t.Fatalf("MkdirAll %q: %s", dpath, err)
+	}
+	fd, err = Create(fpath)
+	if err != nil {
+		t.Fatalf("create %q: %s", fpath, err)
+	}
+	fd.Close()
+	fd, err = Create(dpath + "/file")
+	if err != nil {
+		t.Fatalf("create %q: %s", fpath, err)
+	}
+	fd.Close()
+	if err = RemoveAll(path); err != nil {
+		t.Fatalf("RemoveAll %q (third): %s", path, err)
+	}
+	if _, err := Lstat(path); err == nil {
+		t.Fatalf("Lstat %q succeeded after RemoveAll (third)", path)
+	}
+
+	// Chmod is not supported under Windows and test fails as root.
+	if runtime.GOOS != "windows" && Getuid() != 0 {
+		// Make directory with file and subdirectory and trigger error.
+		if err = MkdirAll(dpath, 0777); err != nil {
+			t.Fatalf("MkdirAll %q: %s", dpath, err)
+		}
+
+		for _, s := range []string{fpath, dpath + "/file1", path + "/zzz"} {
+			fd, err = Create(s)
+			if err != nil {
+				t.Fatalf("create %q: %s", s, err)
+			}
+			fd.Close()
+		}
+		if err = Chmod(dpath, 0); err != nil {
+			t.Fatalf("Chmod %q 0: %s", dpath, err)
+		}
+
+		// No error checking here: either RemoveAll
+		// will or won't be able to remove dpath;
+		// either way we want to see if it removes fpath
+		// and path/zzz. Reasons why RemoveAll might
+		// succeed in removing dpath as well include:
+		//	* running as root
+		//	* running on a file system without permissions (FAT)
+		RemoveAll(path)
+		Chmod(dpath, 0777)
+
+		for _, s := range []string{fpath, path + "/zzz"} {
+			if _, err = Lstat(s); err == nil {
+				t.Fatalf("Lstat %q succeeded after partial RemoveAll", s)
+			}
+		}
+	}
+	if err = RemoveAll(path); err != nil {
+		t.Fatalf("RemoveAll %q after partial RemoveAll: %s", path, err)
+	}
+	if _, err = Lstat(path); err == nil {
+		t.Fatalf("Lstat %q succeeded after RemoveAll (final)", path)
+	}
+}
+
+// Test RemoveAll on a large directory.
+func TestRemoveAllLarge(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping in short mode")
+	}
+
+	tmpDir, err := os.MkdirTemp("", "TestRemoveAll-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tmpDir)
+
+	path := filepath.Join(tmpDir, "_TestRemoveAllLarge_")
+
+	// Make directory with 1000 files and remove.
+	if err := MkdirAll(path, 0777); err != nil {
+		t.Fatalf("MkdirAll %q: %s", path, err)
+	}
+	for i := 0; i < 1000; i++ {
+		fpath := fmt.Sprintf("%s/file%d", path, i)
+		fd, err := Create(fpath)
+		if err != nil {
+			t.Fatalf("create %q: %s", fpath, err)
+		}
+		fd.Close()
+	}
+	if err := RemoveAll(path); err != nil {
+		t.Fatalf("RemoveAll %q: %s", path, err)
+	}
+	if _, err := Lstat(path); err == nil {
+		t.Fatalf("Lstat %q succeeded after RemoveAll", path)
+	}
+}
+
+func TestRemoveAllLongPath(t *testing.T) {
+	switch runtime.GOOS {
+	case "aix", "darwin", "ios", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "illumos", "solaris":
+		break
+	default:
+		t.Skip("skipping for not implemented platforms")
+	}
+
+	prevDir, err := Getwd()
+	if err != nil {
+		t.Fatalf("Could not get wd: %s", err)
+	}
+
+	startPath, err := os.MkdirTemp("", "TestRemoveAllLongPath-")
+	if err != nil {
+		t.Fatalf("Could not create TempDir: %s", err)
+	}
+	defer RemoveAll(startPath)
+
+	err = Chdir(startPath)
+	if err != nil {
+		t.Fatalf("Could not chdir %s: %s", startPath, err)
+	}
+
+	// Removing paths with over 4096 chars commonly fails
+	for i := 0; i < 41; i++ {
+		name := strings.Repeat("a", 100)
+
+		err = Mkdir(name, 0755)
+		if err != nil {
+			t.Fatalf("Could not mkdir %s: %s", name, err)
+		}
+
+		err = Chdir(name)
+		if err != nil {
+			t.Fatalf("Could not chdir %s: %s", name, err)
+		}
+	}
+
+	err = Chdir(prevDir)
+	if err != nil {
+		t.Fatalf("Could not chdir %s: %s", prevDir, err)
+	}
+
+	err = RemoveAll(startPath)
+	if err != nil {
+		t.Errorf("RemoveAll could not remove long file path %s: %s", startPath, err)
+	}
+}
+
+func TestRemoveAllDot(t *testing.T) {
+	prevDir, err := Getwd()
+	if err != nil {
+		t.Fatalf("Could not get wd: %s", err)
+	}
+	tempDir, err := os.MkdirTemp("", "TestRemoveAllDot-")
+	if err != nil {
+		t.Fatalf("Could not create TempDir: %s", err)
+	}
+	defer RemoveAll(tempDir)
+
+	err = Chdir(tempDir)
+	if err != nil {
+		t.Fatalf("Could not chdir to tempdir: %s", err)
+	}
+
+	err = RemoveAll(".")
+	if err == nil {
+		t.Errorf("RemoveAll succeed to remove .")
+	}
+
+	err = Chdir(prevDir)
+	if err != nil {
+		t.Fatalf("Could not chdir %s: %s", prevDir, err)
+	}
+}
+
+func TestRemoveAllDotDot(t *testing.T) {
+	t.Parallel()
+
+	tempDir, err := os.MkdirTemp("", "TestRemoveAllDotDot-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+
+	subdir := filepath.Join(tempDir, "x")
+	subsubdir := filepath.Join(subdir, "y")
+	if err := MkdirAll(subsubdir, 0777); err != nil {
+		t.Fatal(err)
+	}
+	if err := RemoveAll(filepath.Join(subsubdir, "..")); err != nil {
+		t.Error(err)
+	}
+	for _, dir := range []string{subsubdir, subdir} {
+		if _, err := Stat(dir); err == nil {
+			t.Errorf("%s: exists after RemoveAll", dir)
+		}
+	}
+}
+
+// Issue #29178.
+func TestRemoveReadOnlyDir(t *testing.T) {
+	t.Parallel()
+
+	tempDir, err := os.MkdirTemp("", "TestRemoveReadOnlyDir-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+
+	subdir := filepath.Join(tempDir, "x")
+	if err := Mkdir(subdir, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	// If an error occurs make it more likely that removing the
+	// temporary directory will succeed.
+	defer Chmod(subdir, 0777)
+
+	if err := RemoveAll(subdir); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := Stat(subdir); err == nil {
+		t.Error("subdirectory was not removed")
+	}
+}
+
+// Issue #29983.
+func TestRemoveAllButReadOnlyAndPathError(t *testing.T) {
+	switch runtime.GOOS {
+	case "js", "windows":
+		t.Skipf("skipping test on %s", runtime.GOOS)
+	}
+
+	if Getuid() == 0 {
+		t.Skip("skipping test when running as root")
+	}
+
+	t.Parallel()
+
+	tempDir, err := os.MkdirTemp("", "TestRemoveAllButReadOnly-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+
+	dirs := []string{
+		"a",
+		"a/x",
+		"a/x/1",
+		"b",
+		"b/y",
+		"b/y/2",
+		"c",
+		"c/z",
+		"c/z/3",
+	}
+	readonly := []string{
+		"b",
+	}
+	inReadonly := func(d string) bool {
+		for _, ro := range readonly {
+			if d == ro {
+				return true
+			}
+			dd, _ := filepath.Split(d)
+			if filepath.Clean(dd) == ro {
+				return true
+			}
+		}
+		return false
+	}
+
+	for _, dir := range dirs {
+		if err := Mkdir(filepath.Join(tempDir, dir), 0777); err != nil {
+			t.Fatal(err)
+		}
+	}
+	for _, dir := range readonly {
+		d := filepath.Join(tempDir, dir)
+		if err := Chmod(d, 0555); err != nil {
+			t.Fatal(err)
+		}
+
+		// Defer changing the mode back so that the deferred
+		// RemoveAll(tempDir) can succeed.
+		defer Chmod(d, 0777)
+	}
+
+	err = RemoveAll(tempDir)
+	if err == nil {
+		t.Fatal("RemoveAll succeeded unexpectedly")
+	}
+
+	// The error should be of type *PathError.
+	// see issue 30491 for details.
+	if pathErr, ok := err.(*PathError); ok {
+		want := filepath.Join(tempDir, "b", "y")
+		if pathErr.Path != want {
+			t.Errorf("RemoveAll(%q): err.Path=%q, want %q", tempDir, pathErr.Path, want)
+		}
+	} else {
+		t.Errorf("RemoveAll(%q): error has type %T, want *fs.PathError", tempDir, err)
+	}
+
+	for _, dir := range dirs {
+		_, err := Stat(filepath.Join(tempDir, dir))
+		if inReadonly(dir) {
+			if err != nil {
+				t.Errorf("file %q was deleted but should still exist", dir)
+			}
+		} else {
+			if err == nil {
+				t.Errorf("file %q still exists but should have been deleted", dir)
+			}
+		}
+	}
+}
+
+func TestRemoveUnreadableDir(t *testing.T) {
+	switch runtime.GOOS {
+	case "js":
+		t.Skipf("skipping test on %s", runtime.GOOS)
+	}
+
+	if Getuid() == 0 {
+		t.Skip("skipping test when running as root")
+	}
+
+	t.Parallel()
+
+	tempDir, err := os.MkdirTemp("", "TestRemoveAllButReadOnly-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+
+	target := filepath.Join(tempDir, "d0", "d1", "d2")
+	if err := MkdirAll(target, 0755); err != nil {
+		t.Fatal(err)
+	}
+	if err := Chmod(target, 0300); err != nil {
+		t.Fatal(err)
+	}
+	if err := RemoveAll(filepath.Join(tempDir, "d0")); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Issue 29921
+func TestRemoveAllWithMoreErrorThanReqSize(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping in short mode")
+	}
+
+	tmpDir, err := os.MkdirTemp("", "TestRemoveAll-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tmpDir)
+
+	path := filepath.Join(tmpDir, "_TestRemoveAllWithMoreErrorThanReqSize_")
+
+	// Make directory with 1025 read-only files.
+	if err := MkdirAll(path, 0777); err != nil {
+		t.Fatalf("MkdirAll %q: %s", path, err)
+	}
+	for i := 0; i < 1025; i++ {
+		fpath := filepath.Join(path, fmt.Sprintf("file%d", i))
+		fd, err := Create(fpath)
+		if err != nil {
+			t.Fatalf("create %q: %s", fpath, err)
+		}
+		fd.Close()
+	}
+
+	// Make the parent directory read-only. On some platforms, this is what
+	// prevents os.Remove from removing the files within that directory.
+	if err := Chmod(path, 0555); err != nil {
+		t.Fatal(err)
+	}
+	defer Chmod(path, 0755)
+
+	// This call should not hang, even on a platform that disallows file deletion
+	// from read-only directories.
+	err = RemoveAll(path)
+
+	if Getuid() == 0 {
+		// On many platforms, root can remove files from read-only directories.
+		return
+	}
+	if err == nil {
+		if runtime.GOOS == "windows" {
+			// Marking a directory as read-only in Windows does not prevent the RemoveAll
+			// from creating or removing files within it.
+			return
+		}
+		t.Fatal("RemoveAll(<read-only directory>) = nil; want error")
+	}
+
+	dir, err := Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dir.Close()
+
+	names, _ := dir.Readdirnames(1025)
+	if len(names) < 1025 {
+		t.Fatalf("RemoveAll(<read-only directory>) unexpectedly removed %d read-only files from that directory", 1025-len(names))
+	}
+}