anchor.diff:          ExecStart = "${pkgs.taskserver}/bin/taskdctl start";
           ExecStop  = "${pkgs.taskserver}/bin/taskdctl stop";
           User = cfg.user;
  +        Group = cfg.group;
         };
       };
     };
  
positive.code:   config = mkIf cfg.enable {
  
      environment.systemPackages = [ pkgs.taskserver ];
  
      systemd.services.taskserver = {
        description = "taskserver Service.";
  
negative.code:       user = mkOption {
          default = "taskd";
          description = "User for taskserver.";
        };
  
        group = mkOption {
          default = "taskd";
          description = "Group for taskserver.";
        };
  
        dataDir = mkOption {
  