def each_volume
      if @volumes
        @volumes.each do |container_path, local_path|
          local_path, permissions = local_path.split(':', 2)
          permissions ||= "ro"
          yield container_path, local_path, permissions
        end
      end
    end
Private: Yields information about each `@volume`.

each_volume do |container_path, local_path, permissions|
end