1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
// 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 (
"internal/syscall/unix"
"io"
"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 does not permit removing ".",
// so we don't permit it either.
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
}
// RemoveAll recurses by deleting the path base from
// its parent directory
parentDir, base := splitPath(path)
parent, err := Open(parentDir)
if IsNotExist(err) {
// If parent does not exist, base cannot exist. Fail silently
return nil
}
if err != nil {
return err
}
defer parent.Close()
if err := removeAllFrom(parent, base); err != nil {
if pathErr, ok := err.(*PathError); ok {
pathErr.Path = parentDir + string(PathSeparator) + pathErr.Path
err = pathErr
}
return err
}
return nil
}
func removeAllFrom(parent *File, base string) error {
parentFd := int(parent.Fd())
// Simple case: if Unlink (aka remove) works, we're done.
err := ignoringEINTR(func() error {
return unix.Unlinkat(parentFd, base, 0)
})
if err == nil || IsNotExist(err) {
return nil
}
// EISDIR means that we have a directory, and we need to
// remove its contents.
// EPERM or EACCES means that we don't have write permission on
// the parent directory, but this entry might still be a directory
// whose contents need to be removed.
// Otherwise just return the error.
if err != syscall.EISDIR && err != syscall.EPERM && err != syscall.EACCES {
return &PathError{Op: "unlinkat", Path: base, Err: err}
}
uErr := err
// Remove the directory's entries.
var recurseErr error
for {
const reqSize = 1024
var respSize int
// Open the directory to recurse into
file, err := openDirAt(parentFd, base)
if err != nil {
if IsNotExist(err) {
return nil
}
if err == syscall.ENOTDIR {
// Not a directory; return the error from the unix.Unlinkat.
return &PathError{Op: "unlinkat", Path: base, Err: uErr}
}
recurseErr = &PathError{Op: "openfdat", Path: base, Err: err}
break
}
for {
numErr := 0
names, readErr := file.Readdirnames(reqSize)
// Errors other than EOF should stop us from continuing.
if readErr != nil && readErr != io.EOF {
file.Close()
if IsNotExist(readErr) {
return nil
}
return &PathError{Op: "readdirnames", Path: base, Err: readErr}
}
respSize = len(names)
for _, name := range names {
err := removeAllFrom(file, name)
if err != nil {
if pathErr, ok := err.(*PathError); ok {
pathErr.Path = base + string(PathSeparator) + pathErr.Path
}
numErr++
if recurseErr == nil {
recurseErr = err
}
}
}
// 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.
file.Close()
// Finish when the end of the directory is reached
if respSize < reqSize {
break
}
}
// Remove the directory itself.
unlinkError := ignoringEINTR(func() error {
return unix.Unlinkat(parentFd, base, unix.AT_REMOVEDIR)
})
if unlinkError == nil || IsNotExist(unlinkError) {
return nil
}
if recurseErr != nil {
return recurseErr
}
return &PathError{Op: "unlinkat", Path: base, Err: unlinkError}
}
// openDirAt opens a directory name relative to the directory referred to by
// the file descriptor dirfd. If name is anything but a directory (this
// includes a symlink to one), it should return an error. Other than that this
// should act like openFileNolog.
//
// This acts like openFileNolog rather than OpenFile because
// we are going to (try to) remove the file.
// The contents of this file are not relevant for test caching.
func openDirAt(dirfd int, name string) (*File, error) {
var r int
for {
var e error
r, e = unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
if e == nil {
break
}
// See comment in openFileNolog.
if e == syscall.EINTR {
continue
}
return nil, e
}
if !supportsCloseOnExec {
syscall.CloseOnExec(r)
}
// We use kindNoPoll because we know that this is a directory.
return newFile(r, name, kindNoPoll), nil
}
|
