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: supermarket_download.rb
    path of file: ./repos/chef/knife/lib/chef/knife
    
    the code of the file until where you have to start completion: #
# Author:: Christopher Webber (<cwebber@chef.io>)
# Copyright:: Copyrig
    
      def desired_cookbook_data
        @desired_cookbook_data ||= begin
                                     uri = if @name_args.length == 1
                                             current_cookbook_data["latest_version"]
                                           else
                                             specific_cookbook_version_url
                                           end