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-rw-r--r--src/os/removeall_noat.go142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/os/removeall_noat.go b/src/os/removeall_noat.go
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+++ b/src/os/removeall_noat.go
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+// 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.
+
+//go:build !unix
+
+package os
+
+import (
+ "io"
+ "runtime"
+ "syscall"
+)
+
+func removeAll(path string) error {
+ if path == "" {
+ // fail silently to retain compatibility with previous behavior
+ // of RemoveAll. See issue 28830.
+ return nil
+ }
+
+ // The rmdir system call permits removing "." on Plan 9,
+ // so we don't permit it to remain consistent with the
+ // "at" implementation of RemoveAll.
+ if endsWithDot(path) {
+ return &PathError{Op: "RemoveAll", Path: path, Err: syscall.EINVAL}
+ }
+
+ // Simple case: if Remove works, we're done.
+ err := Remove(path)
+ if err == nil || IsNotExist(err) {
+ return nil
+ }
+
+ // Otherwise, is this a directory we need to recurse into?
+ dir, serr := Lstat(path)
+ if serr != nil {
+ if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
+ return nil
+ }
+ return serr
+ }
+ if !dir.IsDir() {
+ // Not a directory; return the error from Remove.
+ return err
+ }
+
+ // Remove contents & return first error.
+ err = nil
+ for {
+ fd, err := Open(path)
+ if err != nil {
+ if IsNotExist(err) {
+ // Already deleted by someone else.
+ return nil
+ }
+ return err
+ }
+
+ const reqSize = 1024
+ var names []string
+ var readErr error
+
+ for {
+ numErr := 0
+ names, readErr = fd.Readdirnames(reqSize)
+
+ for _, name := range names {
+ err1 := RemoveAll(path + string(PathSeparator) + name)
+ if err == nil {
+ err = err1
+ }
+ if err1 != nil {
+ numErr++
+ }
+ }
+
+ // If we can delete any entry, break to start new iteration.
+ // Otherwise, we discard current names, get next entries and try deleting them.
+ if numErr != reqSize {
+ break
+ }
+ }
+
+ // Removing files from the directory may have caused
+ // the OS to reshuffle it. Simply calling Readdirnames
+ // again may skip some entries. The only reliable way
+ // to avoid this is to close and re-open the
+ // directory. See issue 20841.
+ fd.Close()
+
+ if readErr == io.EOF {
+ break
+ }
+ // If Readdirnames returned an error, use it.
+ if err == nil {
+ err = readErr
+ }
+ if len(names) == 0 {
+ break
+ }
+
+ // We don't want to re-open unnecessarily, so if we
+ // got fewer than request names from Readdirnames, try
+ // simply removing the directory now. If that
+ // succeeds, we are done.
+ if len(names) < reqSize {
+ err1 := Remove(path)
+ if err1 == nil || IsNotExist(err1) {
+ return nil
+ }
+
+ if err != nil {
+ // We got some error removing the
+ // directory contents, and since we
+ // read fewer names than we requested
+ // there probably aren't more files to
+ // remove. Don't loop around to read
+ // the directory again. We'll probably
+ // just get the same error.
+ return err
+ }
+ }
+ }
+
+ // Remove directory.
+ err1 := Remove(path)
+ if err1 == nil || IsNotExist(err1) {
+ return nil
+ }
+ if runtime.GOOS == "windows" && IsPermission(err1) {
+ if fs, err := Stat(path); err == nil {
+ if err = Chmod(path, FileMode(0200|int(fs.Mode()))); err == nil {
+ err1 = Remove(path)
+ }
+ }
+ }
+ if err == nil {
+ err = err1
+ }
+ return err
+}