func main()

in cmd/gitlab-sshd/main.go [45:102]
45 lines of code
9 McCabe index (conditional complexity)

func main() {
	command.CheckForVersionFlag(os.Args, Version, BuildTime)

	flag.Parse()

	cfg := new(config.Config)
	if *configDir != "" {
		var err error
		cfg, err = config.NewFromDir(*configDir)
		if err != nil {
			log.WithError(err).Fatal("failed to load configuration from specified directory")
		}
	}

	overrideConfigFromEnvironment(cfg)
	if err := cfg.IsSane(); err != nil {
		if *configDir == "" {
			log.WithError(err).Fatal("no config-dir provided, using only environment variables")
		} else {
			log.WithError(err).Fatal("configuration error")
		}
	}

	cfg.ApplyGlobalState()

	logCloser := logger.ConfigureStandalone(cfg)
	defer func() {
		if err := logCloser.Close(); err != nil {
			log.WithError(err).Fatal("Error closing logCloser")
		}
	}()
	ctx, finished := command.Setup("gitlab-sshd", cfg)
	defer finished()

	cfg.GitalyClient.InitSidechannelRegistry(ctx)

	server, err := sshd.NewServer(cfg)
	if err != nil {
		log.WithError(err).Fatal("Failed to start GitLab built-in sshd")
	}

	// Startup monitoring endpoint.
	if cfg.Server.WebListen != "" {
		startupMonitoringEndpoint(cfg, server)
	}

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	done := make(chan os.Signal, 1)
	signal.Notify(done, syscall.SIGINT, syscall.SIGTERM)

	gracefulShutdown(ctx, done, cfg, server, cancel)

	if err := server.ListenAndServe(ctx); err != nil {
		log.WithError(err).Fatal("GitLab built-in sshd failed to listen for new connections")
	}
}