Function main

src/cli/mesos.cpp:75–144

int main(int argc, char** argv)
{
  Option<string> value;

  // Try and add the absolute dirname of argv[0] to PATH so we can
  // find commands (since our installation directory might not be on
  // the path).
  Result<string> realpath = os::realpath(Path(argv[0]).dirname());
  if (realpath.isSome()) {
    value = os::getenv("PATH");
    if (value.isSome()) {
      os::setenv("PATH", realpath.get() + ":" + value.get());
    } else {
      os::setenv("PATH", realpath.get());
    }
  }

  if (argc < 2) {
    usage(argv[0]);
    return EXIT_FAILURE;
  }

  // Update PYTHONPATH to include path to installed 'mesos' module.
  // TODO(benh): Remove this if/when we install the 'mesos' module via
  // PIP and setuptools.
  string path = path::join(PKGLIBEXECDIR, "python");
  value = os::getenv("PYTHONPATH");
  if (value.isSome()) {
    os::setenv("PYTHONPATH", value.get() + ":" + path);
  } else {
    os::setenv("PYTHONPATH", path);
  }

  // Now dispatch to any mesos-'command' on PATH.
  if (string(argv[1]) == "help") {
    if (argc == 2) {
      usage(argv[0]);
      return EXIT_SUCCESS;
    } else {
      // 'mesos help command' => 'mesos command --help'
      argv[1] = argv[2];
      argv[2] = (char*) "--help";
      return main(argc, argv);
    }
  } else if (string(argv[1]).find("--") == 0) {
    cerr << "Not expecting '" << argv[1] << "' before command" << endl;
    usage(argv[0]);
    return EXIT_FAILURE;
  } else {
    string command = argv[1];
    if (command == "slave") {
      cerr << "WARNING: subcommand 'slave' is deprecated in favor of 'agent'."
           << endl
           << endl;
    }
    string executable = "mesos-" + command;
    argv[1] = (char*) executable.c_str();
    execvp(executable.c_str(), argv + 1);