# File lib/deltacloud/drivers/google/google_driver.rb, line 185
  def update_blob_metadata(credentials, opts={})
    google_client = new_client(credentials)
    safely do
      meta_hash = BlobHelper::rename_metadata_headers(opts['meta_hash'], 'x-goog-meta-')
      options = {'x-goog-metadata-directive'=>'REPLACE'}
      options.merge!(meta_hash)
      bucket = opts['bucket']
      blob = opts[:id]
      google_client.copy_object(bucket, blob, bucket, blob, options) #source,source,target,target,options
      meta_hash.gsub_keys("x-goog-meta-", "")
    end
  end