{ lib, pkgs, ... }:
let
  gcc-system-features = arch: lib.optionals (arch != null) ([ "gccarch-${arch}" ]
    ++ map (x: "gccarch-${x}") lib.systems.architectures.inferiors.${arch});
in
{
  imports = [
    ../modules/ipmi-supermicro.nix
    ../modules/hardware/supermicro-H12SSL-i.nix
    ../modules/iperf-server.nix
    ../modules/hypervisor.nix
    ../modules/hydra/coordinator.nix
    ../modules/android-cache.nix
    ../modules/garage.nix
    ../modules/users/friends.nix
  ];

  networking.hostName = "epyc";

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  virtualisation.docker = {
    enable = true;
    rootless.enable = true;
  };

  # TODO: there's a critical bug on 6.8+ where btrfs won't mount the rootfs at all.
  # Do not upgrade until it is fixed. Ping Raito when needed.
  boot.kernelPackages = pkgs.linuxPackages_6_7;

  # Open public access to our PostgreSQL.
  services.postgresql.enable = true;
  services.postgresql.enableTCPIP = true;
  services.postgresql.authentication = ''
    host  hydra-nixos-org hydra_ro  ::/0  trust
  '';
  networking.firewall.allowedTCPPorts = [ 5432 ];

  nix.buildMachines = [
    {
      hostName = "localhost";
      systems = [
        "x86_64-linux"
        "riscv64-linux"
      ];
      supportedFeatures = [ "kvm" "nixos-test" "big-parallel" "benchmark" ] ++ gcc-system-features "znver3";
      maxJobs = 2;
    }
  ];

  boot.binfmt.emulatedSystems = [ "riscv64-linux" "aarch64-linux" "riscv64-linux" ];

  simd.arch = "znver3";
  system.stateVersion = "23.05";
}