anchor.diff:          description = "Location where MongoDB stores its files";
         };
   
  -      logpath = mkOption {
  -        default = "/var/log/mongodb/mongod.log";
  -        description = "Location where MongoDB stores its logfile";
  -      };
  -
  -      logappend = mkOption {
  -        default = true;
  -        description = "Append logfile instead over overwriting";
  +      pidFile = mkOption {
  +        default = "/var/run/mongodb.pid";
  +        description = "Location of MongoDB pid file";
         };
   
         replSetName = mkOption {
  
positive.code:         serviceConfig = {
            ExecStart = "${mongodb}/bin/mongod --quiet --config ${mongoCnf}";
            User = cfg.user;
          };
        };
  
    };
  
negative.code: 
      environment.systemPackages = [ mongodb ];
  
      systemd.services.mongodb =
        { description = "MongoDB server";
  
  