// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
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package os
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import (
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"io"
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"syscall"
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)
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func removeAll(path string) error {
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if path == "" {
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// fail silently to retain compatibility with previous behavior
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// of RemoveAll. See issue 28830.
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return nil
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}
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// The rmdir system call permits removing "." on Plan 9,
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// so we don't permit it to remain consistent with the
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// "at" implementation of RemoveAll.
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if endsWithDot(path) {
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return &PathError{"RemoveAll", path, syscall.EINVAL}
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}
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// Simple case: if Remove works, we're done.
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err := Remove(path)
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if err == nil || IsNotExist(err) {
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return nil
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}
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// Otherwise, is this a directory we need to recurse into?
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dir, serr := Lstat(path)
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if serr != nil {
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if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
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return nil
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}
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return serr
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}
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if !dir.IsDir() {
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// Not a directory; return the error from Remove.
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return err
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}
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// Remove contents & return first error.
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err = nil
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for {
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fd, err := Open(path)
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if err != nil {
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if IsNotExist(err) {
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// Already deleted by someone else.
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return nil
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}
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return err
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}
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const request = 1024
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names, err1 := fd.Readdirnames(request)
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// Removing files from the directory may have caused
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// the OS to reshuffle it. Simply calling Readdirnames
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// again may skip some entries. The only reliable way
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// to avoid this is to close and re-open the
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// directory. See issue 20841.
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fd.Close()
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for _, name := range names {
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err1 := RemoveAll(path + string(PathSeparator) + name)
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if err == nil {
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err = err1
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}
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}
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if err1 == io.EOF {
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break
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}
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// If Readdirnames returned an error, use it.
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if err == nil {
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err = err1
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}
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if len(names) == 0 {
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break
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}
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// We don't want to re-open unnecessarily, so if we
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// got fewer than request names from Readdirnames, try
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// simply removing the directory now. If that
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// succeeds, we are done.
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if len(names) < request {
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err1 := Remove(path)
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if err1 == nil || IsNotExist(err1) {
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return nil
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}
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if err != nil {
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// We got some error removing the
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// directory contents, and since we
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// read fewer names than we requested
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// there probably aren't more files to
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// remove. Don't loop around to read
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// the directory again. We'll probably
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// just get the same error.
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return err
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}
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}
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}
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// Remove directory.
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err1 := Remove(path)
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if err1 == nil || IsNotExist(err1) {
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return nil
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}
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if err == nil {
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err = err1
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}
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return err
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}
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