Golang cli.RequiresMaxArgs函数代码示例

// NewImagesCommand creates a new `docker images` command
func NewImagesCommand(dockerCli *command.DockerCli) *cobra.Command {
	opts := imagesOptions{filter: opts.NewFilterOpt()}

	cmd := &cobra.Command{
		Use:   "images [OPTIONS] [REPOSITORY[:TAG]]",
		Short: "List images",
		Args:  cli.RequiresMaxArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			if len(args) > 0 {
				opts.matchName = args[0]
			}
			return runImages(dockerCli, opts)
		},
	}

	flags := cmd.Flags()

	flags.BoolVarP(&opts.quiet, "quiet", "q", false, "Only show numeric IDs")
	flags.BoolVarP(&opts.all, "all", "a", false, "Show all images (default hides intermediate images)")
	flags.BoolVar(&opts.noTrunc, "no-trunc", false, "Don't truncate output")
	flags.BoolVar(&opts.showDigests, "digests", false, "Show digests")
	flags.StringVar(&opts.format, "format", "", "Pretty-print images using a Go template")
	flags.VarP(&opts.filter, "filter", "f", "Filter output based on conditions provided")

	return cmd
}

func newCreateCommand(dockerCli *client.DockerCli) *cobra.Command {
	opts := createOptions{
		driverOpts: *opts.NewMapOpts(nil, nil),
	}

	cmd := &cobra.Command{
		Use:   "create [OPTIONS] [VOLUME]",
		Short: "Create a volume",
		Long:  createDescription,
		Args:  cli.RequiresMaxArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			if len(args) == 1 {
				if opts.name != "" {
					fmt.Fprint(dockerCli.Err(), "Conflicting options: either specify --name or provide positional arg, not both\n")
					return cli.StatusError{StatusCode: 1}
				}
				opts.name = args[0]
			}
			return runCreate(dockerCli, opts)
		},
	}
	flags := cmd.Flags()
	flags.StringVarP(&opts.driver, "driver", "d", "local", "Specify volume driver name")
	flags.StringVar(&opts.name, "name", "", "Specify volume name")
	flags.Lookup("name").Hidden = true
	flags.VarP(&opts.driverOpts, "opt", "o", "Set driver specific options")
	flags.StringSliceVar(&opts.labels, "label", []string{}, "Set metadata for a volume")

	return cmd
}

// NewLoginCommand creates a new `docker login` command
func NewLoginCommand(dockerCli *command.DockerCli) *cobra.Command {
	var opts loginOptions

	cmd := &cobra.Command{
		Use:   "login [OPTIONS] [SERVER]",
		Short: "Log in to a Docker registry.",
		Long:  "Log in to a Docker registry.\nIf no server is specified, the default is defined by the daemon.",
		Args:  cli.RequiresMaxArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			if len(args) > 0 {
				opts.serverAddress = args[0]
			}
			return runLogin(dockerCli, opts)
		},
	}

	flags := cmd.Flags()

	flags.StringVarP(&opts.user, "username", "u", "", "Username")
	flags.StringVarP(&opts.password, "password", "p", "", "Password")

	// Deprecated in 1.11: Should be removed in docker 1.13
	flags.StringVarP(&opts.email, "email", "e", "", "Email")
	flags.MarkDeprecated("email", "will be removed in 1.13.")

	return cmd
}

// NewLogoutCommand creates a new `docker login` command
func NewLogoutCommand(dockerCli *client.DockerCli) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "logout [SERVER]",
		Short: "Log out from a Docker registry.",
		Long:  "Log out from a Docker registry.\nIf no server is specified, the default is defined by the daemon.",
		Args:  cli.RequiresMaxArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			var serverAddress string
			if len(args) > 0 {
				serverAddress = args[0]
			}
			return runLogout(dockerCli, serverAddress)
		},
	}

	return cmd
}

// NewDiskUsageCommand creates a new cobra.Command for `docker df`
func NewDiskUsageCommand(dockerCli *command.DockerCli) *cobra.Command {
	var opts diskUsageOptions

	cmd := &cobra.Command{
		Use:   "df [OPTIONS]",
		Short: "Show docker disk usage",
		Args:  cli.RequiresMaxArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			return runDiskUsage(dockerCli, opts)
		},
	}

	flags := cmd.Flags()

	flags.BoolVarP(&opts.verbose, "verbose", "v", false, "Show detailed information on space usage")

	return cmd
}