return errors.New("the --old-config flag is mandatory")
			}

			oldCfgBytes, err := os.ReadFile(oldCfgPath)
			if err != nil {
				return err
			}

			outputBytes, err := configutil.MigrateOldConfig(oldCfgBytes, allowExperimental, nil)
			if err != nil {
				return err
			}

			if newCfgPath == "" {
				fmt.Fprint(out, string(outputBytes))
			} else {