{ config, lib, pkgs, ... }:
let
  hydraPort = (import ../data/aliases.nix).services.hydra.port;
in
{
  networking.firewall.allowedTCPPorts = [ hydraPort ];

  services.hydra = {
    enable = true;
    hydraURL = "https://hydra.orbekk.com";
    notificationSender = "kj+hydra@orbekk.com";
    port = hydraPort;
  };
  
  nix = {
    distributedBuilds = true;
    nrBuildUsers = 30;
    # Enable this if I run low on disk.
    gc.automatic = lib.mkForce false;
    buildMachines = [
      {
        hostName = "localhost";
        systems = [ "x86_64-linux" "i686-linux" ];
        maxJobs = "16";
        supportedFeatures = [ "kvm" "nixos-test" "big-parallel" "benchmark" ]; 
      }
    ];
    extraOptions = "auto-optimise-store = true";
  };
  nixpkgs.config = {
    allowUnfree = true;
  };
}