{
  lib,
  tree,
  ...
}: let
  inherit (lib.lists) flatten;
in {
  nixpkgs.overlays = [
    (_final: super: {
      makeModulesClosure = x:
        super.makeModulesClosure (x // {allowMissing = true;});
    })
  ];

  imports = flatten (with tree; [
    users.root
    users.chaos

    (with tree.profiles.nixos; [
      sshd

      connectivity.networkManager
      wifiHardware

      nixGC
      serverExtras
    ])

    (with presets.home-manager.by-user; [
      root.base
      root.minimalServer
    ])

    ./hardware.nix
  ]);

  networking.firewall = {
    enable = true;
    allowPing = true;
    checkReversePath = "loose";
    allowedTCPPorts = [22];
  };

  networking.hostName = "raspberry";
  time.timeZone = "Europe/London";

  system.stateVersion = "24.05";
  home-manager.users.root.home.stateVersion = "24.05";
  home-manager.users.chaos.home.stateVersion = "24.05";
}