anchor.diff:            "--start-server=${mkSavePath cfg.saveName}"
             "--server-settings=${serverSettingsFile}"
             (optionalString (cfg.mods != []) "--mod-directory=${modDir}")
  +          (optionalString (cfg.admins != []) "--server-adminlist=${serverAdminsFile}")
           ];
   
           # Sandboxing
  
positive.code:     auto_pause = true;
      only_admins_can_pause_the_game = true;
      autosave_only_on_server = true;
      admins = [];
      non_blocking_saving = cfg.nonBlockingSaving;
    } // cfg.extraSettings;
    serverSettingsFile = pkgs.writeText "server-settings.json" (builtins.toJSON (filterAttrsRecursive (n: v: v != null) serverSettings));
    modDir = pkgs.factorio-utils.mkModDirDrv cfg.mods;
  in
  {
  
negative.code:           The port to which the service should bind.
          '';
        };
  
        admins = mkOption {
          type = types.listOf types.str;
          default = [];
          example = [ "username" ];
          description = ''
            List of player names which will be admin.
          '';
        };
  
        openFirewall = mkOption {
          type = types.bool;
          default = false;
  