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// Copyright 2009 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.
package os
import (
"syscall"
)
// MkdirAll creates a directory named path,
// along with any necessary parents, and returns nil,
// or else returns an error.
// The permission bits perm (before umask) are used for all
// directories that MkdirAll creates.
// If path is already a directory, MkdirAll does nothing
// and returns nil.
func MkdirAll(path string, perm FileMode) error {
// Fast path: if we can tell whether path is a directory or file, stop with success or error.
dir, err := Stat(path)
if err == nil {
if dir.IsDir() {
return nil
}
return &PathError{Op: "mkdir", Path: path, Err: syscall.ENOTDIR}
}
// Slow path: make sure parent exists and then call Mkdir for path.
// Extract the parent folder from path by first removing any trailing
// path separator and then scanning backward until finding a path
// separator or reaching the beginning of the string.
i := len(path) - 1
for i >= 0 && IsPathSeparator(path[i]) {
i--
}
for i >= 0 && !IsPathSeparator(path[i]) {
i--
}
if i < 0 {
i = 0
}
// If there is a parent directory, and it is not the volume name,
// recurse to ensure parent directory exists.
if parent := path[:i]; len(parent) > len(volumeName(path)) {
err = MkdirAll(parent, perm)
if err != nil {
return err
}
}
// Parent now exists; invoke Mkdir and use its result.
err = Mkdir(path, perm)
if err != nil {
// Handle arguments like "foo/." by
// double-checking that directory doesn't exist.
dir, err1 := Lstat(path)
if err1 == nil && dir.IsDir() {
return nil
}
return err
}
return nil
}
// RemoveAll removes path and any children it contains.
// It removes everything it can but returns the first error
// it encounters. If the path does not exist, RemoveAll
// returns nil (no error).
// If there is an error, it will be of type *PathError.
func RemoveAll(path string) error {
return removeAll(path)
}
// endsWithDot reports whether the final component of path is ".".
func endsWithDot(path string) bool {
if path == "." {
return true
}
if len(path) >= 2 && path[len(path)-1] == '.' && IsPathSeparator(path[len(path)-2]) {
return true
}
return false
}
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