public function validateAcsf() {
    $this->say("Validating ACSF settings...");
    $task = $this->taskDrush()
      ->stopOnFail()
      ->drush("--include=modules/contrib/acsf/acsf_init acsf-init-verify");
    $result = $task->run();
    if (!$result->wasSuccessful()) {
      throw new BltException("Failed to verify ACSF settings. Re-run acsf-init and commit the results.");
    }
  }