nanuqsaurus/modules/system/base.nix

{
  config,
  lib,
  pkgs,
  ...
}:

{
  time.timeZone = "UTC";

  i18n.defaultLocale = "en_US.UTF-8";
  console.keyMap = "us";

  boot.supportedFilesystems = [
    "btrfs"
    "ext4"
    "vfat"
    "xfs"
  ];
  boot.loader = {
    systemd-boot = {
      enable = true;
      # Only keep 10 generations maximum
      configurationLimit = lib.mkDefault 10;
    };
    efi.canTouchEfiVariables = true;
  };

  nix.settings = {

    experimental-features = [
      "nix-command"
      "flakes"
    ];

    # Only allow root and sudoers to run Nix commands
    allowed-users = [
      "root"
      "@wheel"
    ];

    substituters = lib.mkBefore [
      "https://cache.lix.systems"
    ];
    trusted-public-keys = lib.mkBefore [
      "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
    ];
  };

  services.openssh.enable = true;

  networking = {
    useDHCP = lib.mkDefault true;
    firewall.trustedInterfaces = [ "virbr0" ];
  };

  nixpkgs.config.allowUnfree = true;

  programs = {
    nix-index = {
      enable = lib.mkDefault true;
      enableBashIntegration = lib.mkDefault true;
    };
    nix-index-database.comma.enable = lib.mkDefault true;
    virt-manager.enable = true;
  };

  # Optimise the Nix store once a day
  nix.optimise = lib.mkDefault {
    automatic = true;
    dates = [ "daily" ];
  };

  # Clean the Nix store once a day
  nix.gc = lib.mkDefault {
    automatic = true;
    dates = "daily";
    options = "--delete-older-than 30d";
  };

  system.stateVersion = "25.11";

  virtualisation = {
    containers.enable = true;
    # docker.enable = true;
    podman = {
      enable = true;
      dockerCompat = true;
      # Required for containers under podman-compose to be able to talk to each other.
      defaultNetwork.settings.dns_enabled = true;
    };
    libvirtd.enable = true;
  };

  security.sudo = {
    enable = lib.mkDefault true;
    wheelNeedsPassword = lib.mkForce false;
  };

  # Locked down root user as a default
  users.users.root = lib.mkDefault {
    shell = pkgs.zsh;
    extraGroups = [
      "networkmanager"
      "wheel"
    ];
    hashedPassword = lib.mkDefault "!";
    initialHashedPassword = lib.mkDefault "!";
  };
}