public function import() {
    $task = $this->taskDrush()
      ->drush('sql-drop')
      ->drush('sql-cli < ' . $this->getConfigValue('setup.dump-file'));
    $result = $task->run();
    $exit_code = $result->getExitCode();

    if ($exit_code) {
      throw new BltException("Unable to import setup.dump-file.");
    }
  }