syncthing/internal/osutil/mkdirall_windows.go

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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.
// Modified by Zillode to fix https://github.com/syncthing/syncthing/issues/1822
// Sync with https://github.com/golang/go/blob/master/src/os/path.go
// See https://github.com/golang/go/issues/10900
package osutil
import (
"os"
"path/filepath"
"syscall"
)
// 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 os.FileMode) error {
// Fast path: if we can tell whether path is a directory or file, stop with success or error.
dir, err := os.Stat(path)
if err == nil {
if dir.IsDir() {
return nil
}
return &os.PathError{"mkdir", path, syscall.ENOTDIR}
}
// Slow path: make sure parent exists and then call Mkdir for path.
i := len(path)
for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
i--
}
j := i
for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
j--
}
if j > 1 {
// Create parent
parent := path[0 : j-1]
if parent != filepath.VolumeName(parent) {
err = MkdirAll(parent, perm)
if err != nil {
return err
}
}
}
// Parent now exists; invoke Mkdir and use its result.
err = os.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.IsDir() {
return nil
}
return err
}
return nil
}