protected function getExcludeListFile() {
    $exclude_file = $this->getConfigValue('deploy.exclude_file');
    $exclude_additions = $this->getConfigValue('deploy.exclude_additions_file');
    if (file_exists($exclude_additions)) {
      $this->say("Combining exclusions from deploy.deploy-exclude-additions and deploy.deploy-exclude files...");
      $exclude_file = $this->mungeExcludeLists($exclude_file, $exclude_additions);
    }

    return $exclude_file;
  }