You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gem.rb
    path of file: ./repos/fpm/lib/fpm/package
    
    the code of the file until where you have to start completion: require "fpm/namespace"
require "fpm/package"
require "rubygems"
require "fileutils"
require "fpm/util"
require "yaml"

# A rubygems packag
    
  def staging_path(path=nil)
    @gem_staging_path ||= attributes[:gem_stagingdir] || Stud::Temporary.directory("package-#{type}-staging")
    @staging_path = @gem_staging_path

    if path.nil?
      return @staging_path
    else
      return File.join(@staging_path, path)
    end