Function main

src/cli/resolve.cpp:64–124

int main(int argc, char** argv)
{
  Flags flags;
  flags.setUsageMessage("Usage: " + Path(argv[0]).basename() + " <master>");

  // Load flags from environment and command line, and remove
  // them from argv.
  Try<flags::Warnings> load = flags.load(None(), &argc, &argv);

  if (flags.help) {
    cout << flags.usage() << endl;
    return EXIT_SUCCESS;
  }

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

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

  // 'master' argument must be the only argument left after parsing.
  if (argc != 2) {
    cerr << flags.usage("There must be only one argument: <master>") << endl;
    return EXIT_FAILURE;
  }

  string master = argv[1];
  Try<mesos::master::detector::MasterDetector*> detector =
    mesos::master::detector::MasterDetector::create(master);

  if (detector.isError()) {
    cerr << "Failed to create a master detector: " << detector.error() << endl;
    return EXIT_FAILURE;
  }

  Future<Option<MasterInfo>> masterInfo = detector.get()->detect();

  if (!masterInfo.await(flags.timeout)) {
    cerr << "Failed to detect master from '" << master
         << "' within " << flags.timeout << endl;
    return -1;
  } else {
    CHECK(!masterInfo.isDiscarded());

    if (masterInfo.isFailed()) {
      cerr << "Failed to detect master from '" << master
           << "': " << masterInfo.failure() << endl;
      return EXIT_FAILURE;
    }
  }

  // The future is not satisfied unless the result is Some.
  CHECK_SOME(masterInfo.get());
  cout << strings::remove(masterInfo->get().pid(), "master@") << endl;