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// Package longpath introduces some constants and helper functions for handling
// long paths in Windows.
//
// Long paths are expected to be prepended with "\\?\" and followed by either a
// drive letter, a UNC server\share, or a volume identifier.
package longpath // import "github.com/docker/docker/pkg/longpath"
import (
"os"
"runtime"
"strings"
)
// Prefix is the longpath prefix for Windows file paths.
const Prefix = `\\?\`
// AddPrefix adds the Windows long path prefix to the path provided if
// it does not already have it.
func AddPrefix(path string) string {
if !strings.HasPrefix(path, Prefix) {
if strings.HasPrefix(path, `\\`) {
// This is a UNC path, so we need to add 'UNC' to the path as well.
path = Prefix + `UNC` + path[1:]
} else {
path = Prefix + path
}
}
return path
}
// MkdirTemp is the equivalent of [os.MkdirTemp], except that on Windows
// the result is in Windows longpath format. On Unix systems it is
// equivalent to [os.MkdirTemp].
func MkdirTemp(dir, prefix string) (string, error) {
tempDir, err := os.MkdirTemp(dir, prefix)
if err != nil {
return "", err
}
if runtime.GOOS != "windows" {
return tempDir, nil
}
return AddPrefix(tempDir), nil
}
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