def fetch_local
      if File.file?(@local)
        # Check for bad user input in the local config.yml file.
        local = YAML.load_file(@local)
        raise FormatError unless local.is_a?(::Hash)

        local
      else
        {}
      end
    end
def fetch_local
      if File.file?(@local)
        # Check for bad user input in the local config.yml file.
        local = YAML.load_file(@local)
        raise FormatError unless local.is_a?(::Hash)

        local
      else
        {}
      end
    end
Returns a hash with the alternate values that have to override the default
 ones.