# File lib/deltacloud/drivers/mock/mock_driver.rb, line 463
  def blob_metadata(credentials, opts={})
    check_credentials(credentials)
    blobfile = File::join("#{@storage_root}", "buckets", "blobs", "#{opts[:id]}.yml")
    #safely do - mechanism not suitable here since head requests don't return a body response
    begin
      blob = YAML.load_file(blobfile)
    rescue Errno::ENOENT
      return nil #server.rb picks this up and gives 404
    end
    blob[:user_metadata]
  end