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79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
//go:build windows
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package file
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import (
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"os"
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"path/filepath"
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"syscall"
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)
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// MkdirAll creates a directory named path, along with any necessary parents.
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//
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// Improves os.MkdirAll by avoiding trying to create a folder `\\?` when the
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// volume of a given extended length path does not exist, and `\\?\UNC` when
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// a network host name does not exist.
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//
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// Based on source code from golang's os.MkdirAll
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// (https://github.com/golang/go/blob/master/src/os/path.go)
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func MkdirAll(path string, perm os.FileMode) error {
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// Fast path: if we can tell whether path is a directory or file, stop with success or error.
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dir, err := os.Stat(path)
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if err == nil {
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if dir.IsDir() {
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return nil
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}
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return &os.PathError{
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Op: "mkdir",
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Path: path,
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Err: syscall.ENOTDIR,
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}
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}
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// Slow path: make sure parent exists and then call Mkdir for path.
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i := len(path)
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for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
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i--
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}
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if i > 0 {
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path = path[:i]
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if path == filepath.VolumeName(path) {
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// Make reference to a drive's root directory include the trailing slash.
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// In extended-length form without trailing slash ("\\?\C:"), os.Stat
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// and os.Mkdir both fails. With trailing slash ("\\?\C:\") works,
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// and regular paths with or without it ("C:" and "C:\") both works.
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path += string(os.PathSeparator)
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} else {
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// See if there is a parent to be created first.
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// Not when path refer to a drive's root directory, because we don't
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// want to return noninformative error trying to create \\?.
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j := i
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for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
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j--
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}
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if j > 1 {
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if path[:j-1] != `\\?\UNC` && path[:j-1] != `\\?` {
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// Create parent.
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err = MkdirAll(path[:j-1], perm)
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if err != nil {
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return err
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}
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}
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}
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}
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}
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// Parent now exists; invoke Mkdir and use its result.
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err = os.Mkdir(path, perm)
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if err != nil {
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// Handle arguments like "foo/." by
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// double-checking that directory doesn't exist.
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dir, err1 := os.Lstat(path)
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if err1 == nil && dir.IsDir() {
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return nil
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}
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return err
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}
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return nil
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}
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