update cobra and use Tags

Signed-off-by: Victor Vieux <vieux@docker.com>

command/checkpoint/cmd.go

@@ -17,6 +17,7 @@ func NewCheckpointCommand(dockerCli *command.DockerCli) *cobra.Command {
 		Run: func(cmd *cobra.Command, args []string) {
 			fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString())
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 	cmd.AddCommand(
 		newCreateCommand(dockerCli),

command/cli.go

@@ -38,21 +38,15 @@ type DockerCli struct {
 	err        io.Writer
 	keyFile    string
 	client     client.APIClient
-	hasExperimental *bool
 }
 
 // HasExperimental returns true if experimental features are accessible
 func (cli *DockerCli) HasExperimental() bool {
-	if cli.hasExperimental == nil {
 	if cli.client == nil {
 		return false
 	}
-		enabled := false
+	enabled, _ := cli.client.Ping(context.Background())
-		cli.hasExperimental = &enabled
+	return enabled
-		enabled, _ = cli.client.Ping(context.Background())
-	}
-
-	return *cli.hasExperimental
 }
 
 // Client returns the APIClient

command/container/start.go

@@ -46,8 +46,8 @@ func NewStartCommand(dockerCli *command.DockerCli) *cobra.Command {
 	flags.StringVar(&opts.detachKeys, "detach-keys", "", "Override the key sequence for detaching a container")
 
 	flags.StringVar(&opts.checkpoint, "checkpoint", "", "Restore from this checkpoint")
-	flags.StringVar(&opts.checkpointDir, "checkpoint-dir", "", "Use a custom checkpoint storage directory")
 	flags.SetAnnotation("checkpoint", "experimental", nil)
+	flags.StringVar(&opts.checkpointDir, "checkpoint-dir", "", "Use a custom checkpoint storage directory")
 	flags.SetAnnotation("checkpoint-dir", "experimental", nil)
 	return cmd
 }

command/plugin/cmd.go

@@ -17,6 +17,7 @@ func NewPluginCommand(dockerCli *command.DockerCli) *cobra.Command {
 		Run: func(cmd *cobra.Command, args []string) {
 			fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString())
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 
 	cmd.AddCommand(

command/stack/cmd.go

@@ -17,6 +17,7 @@ func NewStackCommand(dockerCli *command.DockerCli) *cobra.Command {
 		Run: func(cmd *cobra.Command, args []string) {
 			fmt.Fprintf(dockerCli.Err(), "\n"+cmd.UsageString())
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 	cmd.AddCommand(
 		newConfigCommand(dockerCli),

command/stack/deploy.go

@@ -36,6 +36,7 @@ func newDeployCommand(dockerCli *command.DockerCli) *cobra.Command {
 			opts.namespace = strings.TrimSuffix(args[0], ".dab")
 			return runDeploy(dockerCli, opts)
 		},
+		Tags: map[string]string{"experimental": ""},
 	}
 
 	flags := cmd.Flags()