code: func GetVersionFile(exePath string) string {
  	// <root>/.versions/exename.cipd_version
  	return filepath.Join(filepath.Dir(exePath), ".versions", filepath.Base(exePath)+".cipd_version")
  }
docs: // GetVersionFile returns the path to the version file corresponding to the
  // provided exe. This isn't typically needed, but can be useful for debugging.