this is a useless description

modules/game/server/factorio/factorio.nix

@@ -0,0 +1,35 @@
+{pkgs, ...}: {
+  # Also enable non-free packages or else the factorio download will fail:
+  #nixpkgs.config.allowUnfree = true;
+
+  environment.systemPackages = with pkgs; [
+    factorio-headless
+  ];
+
+  services.factorio = {
+    enable = true;
+    openFirewall = true;
+    package = pkgs.factorio-headless.override {
+      versionsJson = ./versions.json;
+    };
+
+    #mods =
+    #  let
+    #    inherit (pkgs) lib;
+    #    modDir = /opt/factorio-mods;
+    #    modList = lib.pipe modDir [
+    #      builtins.readDir
+    #      (lib.filterAttrs (k: v: v == "regular"))
+    #      (lib.mapAttrsToList (k: v: k))
+    #      (builtins.filter (lib.hasSuffix ".zip"))
+    #    ];
+    #    modToDrv = modFileName:
+    #      pkgs.runCommand "copy-factorio-mods" {} ''
+    #        mkdir $out
+    #        cp ${modDir + "/${modFileName}"} $out/${modFileName}
+    #      ''
+    #      // { deps = []; };
+    #  in
+    #    builtins.map modToDrv modList;
+  };
+}