def _Enable(self):
    # Disallow multi-provider 'logging set on' calls, because the schemas
    # differ.
    if not UrlsAreForSingleProvider(self.args):
      raise CommandException('"logging set on" command spanning providers not '
                             'allowed.')
    target_bucket_url = None
    target_prefix = None
    for opt, opt_arg in self.sub_opts:
      if opt == '-b':
        target_bucket_url = StorageUrlFromString(opt_arg)
      if opt == '-o':
        target_prefix = opt_arg

    if not target_bucket_url:
      raise CommandException('"logging set on" requires \'-b <log_bucket>\' '
                             'option')
    if not target_bucket_url.IsBucket():
      raise CommandException('-b option must specify a bucket URL.')

    # Iterate over URLs, expanding wildcards and setting logging on each.
    some_matched = False
    for url_str in self.args:
      bucket_iter = self.GetBucketUrlIterFromArg(url_str, bucket_fields=['id'])
      for blr in bucket_iter:
        url = blr.storage_url
        some_matched = True
        self.logger.info('Enabling logging on %s...', blr)
        logging = apitools_messages.Bucket.LoggingValue(
            logBucket=target_bucket_url.bucket_name,
            logObjectPrefix=target_prefix or url.bucket_name)

        bucket_metadata = apitools_messages.Bucket(logging=logging)
        self.gsutil_api.PatchBucket(url.bucket_name, bucket_metadata,
                                    provider=url.scheme, fields=['id'])
    if not some_matched:
      raise CommandException(NO_URLS_MATCHED_TARGET % list(self.args))
    return 0
Enables logging configuration for a bucket.
dataset/ETHPy150Open GoogleCloudPlatform/gsutil/gslib/commands/logging.py/LoggingCommand._Enable