Function App

cmd/containerd/command/main.go:84–281

App returns a *cli.App instance.

()

// App returns a *cli.App instance.
func App() *cli.App {
	app := cli.NewApp()
	app.Name = "containerd"
	app.Version = version.Version
	app.Usage = usage
	app.Description = `
containerd is a high performance container runtime whose daemon can be started
by using this command. If none of the *config*, *publish*, *oci-hook*, or *help* commands
are specified, the default action of the **containerd** command is to start the
containerd daemon in the foreground.


A default configuration is used if no TOML configuration is specified or located
at the default file location. The *containerd config* command can be used to
generate the default configuration for containerd. The output of that command
can be used and modified as necessary as a custom configuration.`
	app.Flags = []cli.Flag{
		&cli.StringFlag{
			Name:    "config",
			Aliases: []string{"c"},
			Usage:   "Path to the configuration file",
			Value:   filepath.Join(defaults.DefaultConfigDir, "config.toml"),
		},
		&cli.StringFlag{
			Name:    "log-level",
			Aliases: []string{"l"},
			Usage:   "Set the logging level [trace, debug, info, warn, error, fatal, panic]",
		},
		&cli.StringFlag{
			Name:    "address",
			Aliases: []string{"a"},
			Usage:   "Address for containerd's GRPC server",
		},
		&cli.StringFlag{
			Name:  "root",
			Usage: "containerd root directory",
		},
		&cli.StringFlag{
			Name:  "state",
			Usage: "containerd state directory",
		},
	}
	app.Flags = append(app.Flags, serviceFlags()...)
	app.Commands = []*cli.Command{
		configCommand,
		publishCommand,
		ociHook,
	}
	app.Action = func(cliContext *cli.Context) error {
		if args := cliContext.Args(); args.First() != "" {
			return cli.ShowCommandHelp(cliContext, args.First())
		}

		var (
			start       = time.Now()
			signals     = make(chan os.Signal, 2048)
			serverC     = make(chan *server.Server, 1)
			ctx, cancel = context.WithCancel(cliContext.Context)