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().get().pid(), "master@") << endl;
return EXIT_SUCCESS;
}
