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https://github.com/rclone/rclone
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711478554e
Starting with go1.22 the standard os.MkdirAll has improved its handling of volume names, and as part of that it now stops recursing into parent directory if it is a volume name (see:cd589c8a73). This is similar to what was our main change and reason for creating a custom version. When building with go1.22 or newer we can therefore stop using our custom version, with the advantage that we automatically get current and future relevant improvements from golang. To support building with go1.21 the existing custom version is still kept, and therefore also our wrapper function file.MkdirAll - but it now just calls os.MkdirAll with go1.22 or newer on Windows. See #5401, #6420 andacf1e2df84for details about the creation of our custom version of MkdirAll.
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
//go:build windows && !go1.22
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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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