//go:build windows // +build windows package system import ( "fmt" "path/filepath" "strings" ) // CheckSystemDriveAndRemoveDriveLetter verifies and manipulates a Windows path. // This is used, for example, when validating a user provided path in docker cp. // If a drive letter is supplied, it must be the system drive. The drive letter // is always removed. Also, it translates it to OS semantics (IOW / to \). We // need the path in this syntax so that it can ultimately be contatenated with // a Windows long-path which doesn't support drive-letters. Examples: // C: --> Fail // C:\ --> \ // a --> a // /a --> \a // d:\ --> Fail func CheckSystemDriveAndRemoveDriveLetter(path string) (string, error) { if len(path) == 2 && string(path[1]) == ":" { return "", fmt.Errorf("No relative path specified in %q", path) } if !filepath.IsAbs(path) || len(path) < 2 { return filepath.FromSlash(path), nil } if string(path[1]) == ":" && !strings.EqualFold(string(path[0]), "c") { return "", fmt.Errorf("The specified path is not on the system drive (C:)") } return filepath.FromSlash(path[2:]), nil }