Function main

src/cli/execute.cpp:918–1238

int main(int argc, char** argv)
{
  Flags flags;
  mesos::ContentType contentType = mesos::ContentType::PROTOBUF;

  // Load flags from command line only.
  Try<flags::Warnings> load = flags.load(None(), argc, argv);

  // TODO(marco): this should be encapsulated entirely into the
  // FlagsBase API - possibly with a 'guard' that prevents FlagsBase
  // from calling ::exit(EXIT_FAILURE) after calling usage() (which
  // would be the default behavior); see MESOS-2766.
  if (flags.help) {
    cout << flags.usage() << endl;
    return EXIT_SUCCESS;
  }

  if (load.isError()) {
    cerr << flags.usage(load.error()) << endl;
    return EXIT_FAILURE;
  }

  mesos::internal::logging::initialize(argv[0], false);

  // Log any flag warnings.
  foreach (const flags::Warning& warning, load->warnings) {
    LOG(WARNING) << warning.message;
  }

  if (flags.task.isSome() && flags.task_group.isSome()) {
    EXIT(EXIT_FAILURE) << flags.usage(
        "Either task or task group should be set but not both."
        " Provide either '--task' OR '--task_group'");
  } else if (flags.task.isNone() && flags.task_group.isNone()) {
    if (flags.name.isNone()) {
      EXIT(EXIT_FAILURE) << flags.usage("Missing required option --name");
    }

    if (flags.shell && flags.command.isNone()) {
      EXIT(EXIT_FAILURE) << flags.usage("Missing required option --command");
    }
  } else {
    // Either --task or --task_group is set.
    if (flags.name.isSome() ||
        flags.command.isSome() ||
        flags.environment.isSome() ||
        flags.appc_image.isSome()  ||
        flags.docker_image.isSome() ||
        flags.volumes.isSome()) {
      EXIT(EXIT_FAILURE) << flags.usage(
          "'--name, --command, --env, --appc_image, --docker_image,"
          " --volumes' can only be set when both '--task'"
          " and '--task_group' are not set");
    }

    if (flags.task.isSome() && flags.networks.isSome()) {
      EXIT(EXIT_FAILURE) << flags.usage(
          "'--networks' can only be set when"