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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 "os"
// PathError reports an error and the file path where it occurred.
type PathError struct {
Path string;
Error Error;
}
func (p *PathError) String() string {
return p.Path + ": " + p.Error.String();
}
// MkdirAll creates a directory named path,
// along with any necessary parents, and returns nil,
// or else returns an error.
// The permission bits perm 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 int) Error {
// If path exists, stop with success or error.
dir, err := os.Lstat(path);
if err == nil {
if dir.IsDirectory() {
return nil;
}
return &PathError{path, ENOTDIR};
}
// Doesn't already exist; make sure parent does.
i := len(path);
for i > 0 && path[i-1] == '/' { // Skip trailing slashes.
i--;
}
j := i;
for j > 0 && path[j-1] != '/' { // Scan backward over element.
j--;
}
if j > 0 {
// Create parent
err = MkdirAll(path[0:j-1], perm);
if err != nil {
return err;
}
}
// Now parent exists, try to create.
err = Mkdir(path, perm);
if err != nil {
// Handle arguments like "foo/." by
// double-checking that directory doesn't exist.
dir, err1 := os.Lstat(path);
if err1 == nil && dir.IsDirectory() {
return nil;
}
return &PathError{path, err};
}
return nil;
}
// RemoveAll removes path and any children it contains.
// It removes everything it can but returns the first error
// it encounters.
func RemoveAll(path string) Error {
// Simple case: if Remove works, we're done.
err := Remove(path);
if err == nil {
return nil;
}
// Otherwise, is this a directory we need to recurse into?
dir, err1 := os.Lstat(path);
if err1 != nil {
return &PathError{path, err1};
}
if !dir.IsDirectory() {
// Not a directory; return the error from Remove.
return &PathError{path, err};
}
// Directory.
fd, err := Open(path, os.O_RDONLY, 0);
if err != nil {
return &PathError{path, err};
}
defer fd.Close();
// Remove contents & return first error.
err = nil;
for {
names, err1 := fd.Readdirnames(100);
for i, name := range names {
err1 := RemoveAll(path + "/" + name);
if err1 != nil && err == nil {
err = err1;
}
}
// If Readdirnames returned an error, use it.
if err1 != nil && err == nil {
err = &PathError{path, err1};
}
if len(names) == 0 {
break;
}
}
// Remove directory.
err1 = Remove(path);
if err1 != nil && err == nil {
err = &PathError{path, err1};
}
return err;
}
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