b.WriteString("Revision:         " + a.Revision + "\n")
	return b.String()
}

func addInstallFlags(cmd *cobra.Command, args *InstallArgs) {
	cmd.PersistentFlags().StringSliceVarP(&args.InFilenames, "filename", "f", nil, filenameFlagHelpStr)
	cmd.PersistentFlags().DurationVar(&args.ReadinessTimeout, "readiness-timeout", 300*time.Second,
		"Maximum time to wait for Istio resources in each component to be ready.")

	return setupConfigdumpZtunnelConfigWriter(debug, out)
}

func readFile(filename string) ([]byte, error) {
	file := os.Stdin
	if filename != "-" {
		var err error
		file, err = os.Open(filename)
		if err != nil {
			return nil, err
		}
	}
	defer func() {
		if err := file.Close(); err != nil {
			log.Errorf("failed to close %s: %s", filename, err)
		}
	}()
	return io.ReadAll(file)
}