Function initialize

src/logging/logging.cpp:384–524

void initialize(
    const string& _argv0,
    bool installFailureSignalHandler,
    const Option<Flags>& _flags)
{
  static Once* initialized = new Once();

  if (initialized->once()) {
    return;
  }

  argv0 = _argv0;

  // Use the default flags if not specified.
  Flags flags;
  if (_flags.isSome()) {
    flags = _flags.get();

    FLAGS_minloglevel = getLogSeverity(flags.logging_level);
    FLAGS_logbufsecs = flags.logbufsecs;
  }

  if (flags.logging_level != "INFO" &&
      flags.logging_level != "WARNING" &&
      flags.logging_level != "ERROR") {
    cerr << "'" << flags.logging_level << "' is not a valid logging level."
         << " Possible values for 'logging_level' flag are:"
         << " 'INFO', 'WARNING', 'ERROR'." << endl;
    exit(EXIT_FAILURE);
  }

  if (flags.log_dir.isSome()) {
    Try<Nothing> mkdir = os::mkdir(flags.log_dir.get());
    if (mkdir.isError()) {
      cerr << "Could not initialize logging: Failed to create directory "
           << flags.log_dir.get() << ": " << mkdir.error() << endl;
      exit(EXIT_FAILURE);
    }
    FLAGS_log_dir = flags.log_dir.get();
    // Do not log to stderr instead of log files.
    FLAGS_logtostderr = false;
  } else {
    // Log to stderr instead of log files.
    FLAGS_logtostderr = true;
  }

  // Log everything to stderr IN ADDITION to log files unless
  // otherwise specified.
  if (flags.quiet) {
    FLAGS_stderrthreshold = 3; // FATAL.

    // FLAGS_stderrthreshold is ignored when logging to stderr instead
    // of log files. Setting the minimum log level gets around this issue.
    if (FLAGS_logtostderr) {
      FLAGS_minloglevel = 3; // FATAL.
    }
  } else {
    FLAGS_stderrthreshold = FLAGS_minloglevel;