1 // Copyright 2009 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 package os
6 7 import (
8 "syscall"
9 )
10 11 // MkdirAll creates a directory named path,
12 // along with any necessary parents, and returns nil,
13 // or else returns an error.
14 // The permission bits perm (before umask) are used for all
15 // directories that MkdirAll creates.
16 // If path is already a directory, MkdirAll does nothing
17 // and returns nil.
18 func MkdirAll(path string, perm FileMode) error {
19 // Fast path: if we can tell whether path is a directory or file, stop with success or error.
20 dir, err := Stat(path)
21 if err == nil {
22 if dir.IsDir() {
23 return nil
24 }
25 return &PathError{Op: "mkdir", Path: path, Err: syscall.ENOTDIR}
26 }
27 28 // Slow path: make sure parent exists and then call Mkdir for path.
29 i := len(path)
30 for i > 0 && IsPathSeparator(path[i-1]) { // Skip trailing path separator.
31 i--
32 }
33 34 j := i
35 for j > 0 && !IsPathSeparator(path[j-1]) { // Scan backward over element.
36 j--
37 }
38 39 if j > 1 {
40 // Create parent.
41 err = MkdirAll(fixRootDirectory(path[:j-1]), perm)
42 if err != nil {
43 return err
44 }
45 }
46 47 // Parent now exists; invoke Mkdir and use its result.
48 err = Mkdir(path, perm)
49 if err != nil {
50 // Handle arguments like "foo/." by
51 // double-checking that directory doesn't exist.
52 dir, err1 := Lstat(path)
53 if err1 == nil && dir.IsDir() {
54 return nil
55 }
56 return err
57 }
58 return nil
59 }
60 61 // RemoveAll removes path and any children it contains.
62 // It removes everything it can but returns the first error
63 // it encounters. If the path does not exist, RemoveAll
64 // returns nil (no error).
65 // If there is an error, it will be of type *PathError.
66 func RemoveAll(path string) error {
67 return removeAll(path)
68 }
69 70 // endsWithDot reports whether the final component of path is ".".
71 func endsWithDot(path string) bool {
72 if path == "." {
73 return true
74 }
75 if len(path) >= 2 && path[len(path)-1] == '.' && IsPathSeparator(path[len(path)-2]) {
76 return true
77 }
78 return false
79 }
80