return &ExternalInjector{client, &wh.ClientConfig, injectorAddress}, nil
			}
		}
	}
	return e, fmt.Errorf("could not find valid mutatingWebhookConfiguration %q from cluster", defaultWebhookName)
}

func validateFlags() error {
	var err error
	if inFilename == "" {
		err = multierror.Append(err, errors.New("filename not specified (see --filename or -f)"))
	}
	if meshConfigFile == "" && meshConfigMapName == "" && iopFilename == "" {

  @VisibleForTesting
  @ParametricNullness
  static <V extends @Nullable Object, X extends Exception> V getChecked(
      GetCheckedTypeValidator validator, Future<V> future, Class<X> exceptionClass) throws X {
    validator.validateClass(exceptionClass);
    try {
      return future.get();
    } catch (InterruptedException e) {
      currentThread().interrupt();
      throw newWithCause(exceptionClass, e);
    } catch (ExecutionException e) {

  }

  private enum NonCachingWithoutConstructorCheckValidator implements GetCheckedTypeValidator {
    INSTANCE;

    @Override
    public void validateClass(Class<? extends Exception> exceptionClass) {
      checkArgument(
          isCheckedException(exceptionClass),
          "Futures.getChecked exception type (%s) must not be a RuntimeException",
          exceptionClass);

  }

  private enum NonCachingWithoutConstructorCheckValidator implements GetCheckedTypeValidator {
    INSTANCE;

    @Override
    public void validateClass(Class<? extends Exception> exceptionClass) {
      checkArgument(
          isCheckedException(exceptionClass),
          "Futures.getChecked exception type (%s) must not be a RuntimeException",
          exceptionClass);