Function newDockerCommand

cmd/docker/docker.go:136–193

(dockerCli *command.DockerCli)

}

func newDockerCommand(dockerCli *command.DockerCli) *cli.TopLevelCommand {
	var (
		opts    *cliflags.ClientOptions
		helpCmd *cobra.Command
	)

	cmd := &cobra.Command{
		Use:              "docker [OPTIONS] COMMAND [ARG...]",
		Short:            "A self-sufficient runtime for containers",
		SilenceUsage:     true,
		SilenceErrors:    true,
		TraverseChildren: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			if len(args) == 0 {
				return command.ShowHelp(dockerCli.Err())(cmd, args)
			}
			return fmt.Errorf("docker: unknown command: docker %s\n\nRun 'docker --help' for more information", args[0])
		},
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			return isSupported(cmd, dockerCli)
		},
		Version:               fmt.Sprintf("%s, build %s", version.Version, version.GitCommit),
		DisableFlagsInUseLine: true,
		CompletionOptions: cobra.CompletionOptions{
			DisableDefaultCmd:   false,
			HiddenDefaultCmd:    true,
			DisableDescriptions: os.Getenv("DOCKER_CLI_DISABLE_COMPLETION_DESCRIPTION") != "",
		},
	}

	// Disable file-completion by default. Most commands and flags should not
	// complete with filenames.
	cmd.CompletionOptions.SetDefaultShellCompDirective(cobra.ShellCompDirectiveNoFileComp)

	cmd.SetIn(dockerCli.In())
	cmd.SetOut(dockerCli.Out())
	cmd.SetErr(dockerCli.Err())

	opts, helpCmd = cli.SetupRootCommand(cmd)

	// TODO(thaJeztah): move configuring completion for these flags to where the flags are added.
	_ = cmd.RegisterFlagCompletionFunc("context", completeContextNames(dockerCli))
	_ = cmd.RegisterFlagCompletionFunc("log-level", completeLogLevels)

	cmd.Flags().BoolP("version", "v", false, "Print version information and quit")
	setFlagErrorFunc(dockerCli, cmd)

	setupHelpCommand(dockerCli, cmd, helpCmd)
	setHelpFunc(dockerCli, cmd)

	cmd.SetOut(dockerCli.Out())
	commands.AddCommands(cmd, dockerCli)

	visitAll(cmd, setValidateArgs(dockerCli))

	// flags must be the top-level command flags, not cmd.Flags()
	return cli.NewTopLevelCommand(cmd, dockerCli, opts, cmd.Flags())
}