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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
}