# File lib/chef_zero/endpoints/cookbook_version_endpoint.rb, line 18
      def put(request)
        name = request.rest_path[3]
        version = request.rest_path[4]
        existing_cookbook = get_data(request, request.rest_path, :nil)

        # Honor frozen
        if existing_cookbook
          existing_cookbook_json = FFI_Yajl::Parser.parse(existing_cookbook, :create_additions => false)
          if existing_cookbook_json['frozen?']
            if request.query_params['force'] != "true"
              raise RestErrorResponse.new(409, "The cookbook #{name} at version #{version} is frozen. Use the 'force' option to override.")
            end
            # For some reason, you are forever unable to modify "frozen?" on a frozen cookbook.
            request_body = FFI_Yajl::Parser.parse(request.body, :create_additions => false)
            if !request_body['frozen?']
              request_body['frozen?'] = true
              request.body = FFI_Yajl::Encoder.encode(request_body, :pretty => true)
            end
          end
        end

        # Set the cookbook
        set_data(request, request.rest_path[0..1] + ['cookbooks', name, version], request.body, :create_dir, :create)

        # If the cookbook was updated, check for deleted files and clean them up
        if existing_cookbook
          missing_checksums = get_checksums(existing_cookbook) - get_checksums(request.body)
          if missing_checksums.size > 0
            hoover_unused_checksums(missing_checksums, request)
          end
        end

        already_json_response(existing_cookbook ? 200 : 201, populate_defaults(request, request.body))
      end