var GCCmd = &cobra.Command{
	Use:   "garbage-collect <config>",
	Short: "`garbage-collect` deletes layers not referenced by any manifests",
	Long:  "`garbage-collect` deletes layers not referenced by any manifests",
	Run: func(cmd *cobra.Command, args []string) {
		config, err := resolveConfiguration(args)
		if err != nil {
			fmt.Fprintf(os.Stderr, "configuration error: %v\n", err)
			cmd.Usage()
			os.Exit(1)
		}

		driver, err := factory.Create(config.Storage.Type(), config.Storage.Parameters())
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to construct %s driver: %v", config.Storage.Type(), err)
			os.Exit(1)
		}

		ctx := dcontext.Background()
		ctx, err = configureLogging(ctx, config)
		if err != nil {
			fmt.Fprintf(os.Stderr, "unable to configure logging with config: %s", err)
			os.Exit(1)
		}

		k, err := libtrust.GenerateECP256PrivateKey()
		if err != nil {
			fmt.Fprint(os.Stderr, err)
			os.Exit(1)
		}

		registry, err := storage.NewRegistry(ctx, driver, storage.Schema1SigningKey(k))
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to construct registry: %v", err)
			os.Exit(1)
		}

		err = storage.MarkAndSweep(ctx, driver, registry, storage.GCOpts{
			DryRun:         dryRun,
			RemoveUntagged: removeUntagged,
		})
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to garbage collect: %v", err)
			os.Exit(1)
		}
	},
}

var RootCmd = &cobra.Command{
	Use:   "registry",
	Short: "`registry`",
	Long:  "`registry`",
	Run: func(cmd *cobra.Command, args []string) {
		if showVersion {
			version.PrintVersion()
			return
		}
		cmd.Usage()
	},
}

var ServeCmd = &cobra.Command{
	Use:   "serve <config>",
	Short: "`serve` stores and distributes Docker images",
	Long:  "`serve` stores and distributes Docker images.",
	Run: func(cmd *cobra.Command, args []string) {

		ctx := dcontext.WithVersion(dcontext.Background(), version.Version)

		config, err := resolveConfiguration(args)
		if err != nil {
			fmt.Fprintf(os.Stderr, "configuration error: %v\n", err)
			cmd.Usage()
			os.Exit(1)
		}

		if config.HTTP.Debug.Addr != "" {
			go func(addr string) {
				log.Infof("debug server listening %v", addr)
				if err := http.ListenAndServe(addr, nil); err != nil {
					log.Fatalf("error listening on debug interface: %v", err)
				}
			}(config.HTTP.Debug.Addr)
		}

		registry, err := NewRegistry(ctx, config)
		if err != nil {
			log.Fatalln(err)
		}

		if config.HTTP.Debug.Prometheus.Enabled {
			path := config.HTTP.Debug.Prometheus.Path
			if path == "" {
				path = "/metrics"
			}
			log.Info("providing prometheus metrics on ", path)
			http.Handle(path, metrics.Handler())
		}

		if err = registry.ListenAndServe(); err != nil {
			log.Fatalln(err)
		}
	},
}

type Registry struct {
	// contains filtered or unexported fields
}