func newDockerCommand(dockerCli *command.DockerCli) *cobra.Command {
opts := cliflags.NewClientOptions()
var flags *pflag.FlagSet
cmd := &cobra.Command{
Use: "docker [OPTIONS] COMMAND [ARG...]",
Short: "A self-sufficient runtime for containers",
SilenceUsage: true,
SilenceErrors: true,
TraverseChildren: true,
Args: noArgs,
RunE: func(cmd *cobra.Command, args []string) error {
if opts.Version {
showVersion()
return nil
}
return dockerCli.ShowHelp(cmd, args)
},
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
// daemon command is special, we redirect directly to another binary
if cmd.Name() == "daemon" {
return nil
}
// flags must be the top-level command flags, not cmd.Flags()
opts.Common.SetDefaultOptions(flags)
dockerPreRun(opts)
if err := dockerCli.Initialize(opts); err != nil {
return err
}
return isSupported(cmd, dockerCli.Client().ClientVersion(), dockerCli.HasExperimental())
},
}
cli.SetupRootCommand(cmd)
cmd.SetHelpFunc(func(ccmd *cobra.Command, args []string) {
if dockerCli.Client() == nil { // when using --help, PersistenPreRun is not called, so initialization is needed.
// flags must be the top-level command flags, not cmd.Flags()
opts.Common.SetDefaultOptions(flags)
dockerPreRun(opts)
dockerCli.Initialize(opts)
}
if err := isSupported(ccmd, dockerCli.Client().ClientVersion(), dockerCli.HasExperimental()); err != nil {
ccmd.Println(err)
return
}
hideUnsupportedFeatures(ccmd, dockerCli.Client().ClientVersion(), dockerCli.HasExperimental())
if err := ccmd.Help(); err != nil {
ccmd.Println(err)
}
})
flags = cmd.Flags()
flags.BoolVarP(&opts.Version, "version", "v", false, "Print version information and quit")
flags.StringVar(&opts.ConfigDir, "config", cliconfig.ConfigDir(), "Location of client config files")
opts.Common.InstallFlags(flags)
cmd.SetOutput(dockerCli.Out())
cmd.AddCommand(newDaemonCommand())
commands.AddCommands(cmd, dockerCli)
return cmd
}