1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 5 //go:build !baremetal && !js && !wasip1 && !wasip2 && !wasm_unknown && !nintendoswitch
6 7 package os
8 9 import (
10 "io"
11 "runtime"
12 "syscall"
13 )
14 15 func removeAll(path string) error {
16 if path == "" {
17 // fail silently to retain compatibility with previous behavior
18 // of RemoveAll. See issue 28830.
19 return nil
20 }
21 22 // The rmdir system call permits removing "." on Plan 9,
23 // so we don't permit it to remain consistent with the
24 // "at" implementation of RemoveAll.
25 if endsWithDot(path) {
26 return &PathError{Op: "RemoveAll", Path: path, Err: syscall.EINVAL}
27 }
28 29 // Simple case: if Remove works, we're done.
30 err := Remove(path)
31 if err == nil || IsNotExist(err) {
32 return nil
33 }
34 35 // Otherwise, is this a directory we need to recurse into?
36 dir, serr := Lstat(path)
37 if serr != nil {
38 if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
39 return nil
40 }
41 return serr
42 }
43 if !dir.IsDir() {
44 // Not a directory; return the error from Remove.
45 return err
46 }
47 48 // Remove contents & return first error.
49 err = nil
50 for {
51 fd, err := Open(path)
52 if err != nil {
53 if IsNotExist(err) {
54 // Already deleted by someone else.
55 return nil
56 }
57 return err
58 }
59 60 const reqSize = 1024
61 var names []string
62 var readErr error
63 64 for {
65 numErr := 0
66 names, readErr = fd.Readdirnames(reqSize)
67 68 for _, name := range names {
69 err1 := RemoveAll(path + string(PathSeparator) + name)
70 if err == nil {
71 err = err1
72 }
73 if err1 != nil {
74 numErr++
75 }
76 }
77 78 // If we can delete any entry, break to start new iteration.
79 // Otherwise, we discard current names, get next entries and try deleting them.
80 if numErr != reqSize {
81 break
82 }
83 }
84 85 // Removing files from the directory may have caused
86 // the OS to reshuffle it. Simply calling Readdirnames
87 // again may skip some entries. The only reliable way
88 // to avoid this is to close and re-open the
89 // directory. See issue 20841.
90 fd.Close()
91 92 if readErr == io.EOF {
93 break
94 }
95 // If Readdirnames returned an error, use it.
96 if err == nil {
97 err = readErr
98 }
99 if len(names) == 0 {
100 break
101 }
102 103 // We don't want to re-open unnecessarily, so if we
104 // got fewer than request names from Readdirnames, try
105 // simply removing the directory now. If that
106 // succeeds, we are done.
107 if len(names) < reqSize {
108 err1 := Remove(path)
109 if err1 == nil || IsNotExist(err1) {
110 return nil
111 }
112 113 if err != nil {
114 // We got some error removing the
115 // directory contents, and since we
116 // read fewer names than we requested
117 // there probably aren't more files to
118 // remove. Don't loop around to read
119 // the directory again. We'll probably
120 // just get the same error.
121 return err
122 }
123 }
124 }
125 126 // Remove directory.
127 err1 := Remove(path)
128 if err1 == nil || IsNotExist(err1) {
129 return nil
130 }
131 if runtime.GOOS == "windows" && IsPermission(err1) {
132 if fs, err := Stat(path); err == nil {
133 if err = Chmod(path, FileMode(0200|int(fs.Mode()))); err == nil {
134 err1 = Remove(path)
135 }
136 }
137 }
138 if err == nil {
139 err = err1
140 }
141 return err
142 }
143