{lib, ...}: {
  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem pkg.pname [
    "factorio-headless"
  ];
  services.factorio = {
    enable = true;
    package = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/aa2922b69f0245008d93e9edf9f34894db724d89.tar.gz") {
      config.allowUnfree = true;
    }).factorio-headless;
    openFirewall = true;
    nonBlockingSaving = true;
    game-name = "Chandler's Factorio Server";
    description = "Job 28:2";
  };
}