# File lib/chef/knife/cookbook_site_install.rb, line 109
      def parse_name_args!
        if name_args.empty?
          ui.error("please specify a cookbook to download and install")
          exit 1
        elsif name_args.size > 1
          ui.error("Installing multiple cookbooks at once is not supported")
          exit 1
        else
          name_args.first
        end
      end