{ config, pkgs, lib, ... }: {
  # NixOS wants to enable GRUB by default
  boot.loader.grub.enable = false;

  # Enables the generation of /boot/extlinux/extlinux.conf
  boot.loader.generic-extlinux-compatible.enable = true;

  # A bunch of boot parameters needed for optimal runtime on RPi 3B
  boot.kernelParams = [ "cma=32M" "zfs.zfs_arc_max=134217728" ];
  boot.loader.raspberryPi = {
    enable = true;
    version = 3;
    uboot.enable = true;
    firmwareConfig = ''
      hdmi_force_hotplug=1
    '';
  };

  environment.systemPackages = with pkgs; [ libraspberrypi htop vim ];

  # !!! Adding a swap file is optional, but strongly recommended!
  swapDevices = [{
    device = "/swapfile";
    size = 1024;
  }];

  # Configure basic SSH access
  services.openssh = {
    enable = true;
    permitRootLogin = "yes";
  };

  # Cleanup tmp on startup
  boot.cleanTmpDir = true;

  # Set hostname
  networking.hostName = "aegis";

  # Create coace user
  users.users.coace = {
    isNormalUser = true;
    extraGroups = [ "wheel" ];
    openssh.authorizedKeys.keys = [''
      ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINNmNckWBxa2fQkUjWLHgQd32C272yB+f9kTcnooszd5 coolneng@panacea
    ''];
    shell = "${pkgs.fish}/bin/fish";
  };

  # Set vim as default editor
  programs.vim.defaultEditor = true;

  # Set timezone and synchronize NTP
  time.timeZone = "Europe/Brussels";
  services.timesyncd.enable = true;

  # Enable ZFS support
  boot.supportedFilesystems = [ "zfs" ];

  # Scrub zpool monthly
  services.zfs.autoScrub = {
    enable = true;
    interval = "monthly";
  };

  # Auto-upgrade the system and reboot if needed
  system.autoUpgrade = {
    enable = true;
    allowReboot = true;
    dates = "Sat *-*-* 04:40:00";
  };

  # Run Nix garbage collector, while avoiding recompilation
  nix = {
    autoOptimiseStore = true;
    gc = {
      automatic = true;
      options = "--delete-older-than 14d";
    };
    extraOptions = ''
      keep-outputs = true
      keep-derivations = true
      gc-keep-outputs = true
    '';
  };

  # Configure fish shell
  programs.fish.enable = true;
  users.users.root = {
    shell = "${pkgs.fish}/bin/fish";
    openssh.authorizedKeys.keys = [''
      ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINNmNckWBxa2fQkUjWLHgQd32C272yB+f9kTcnooszd5 coolneng@panacea
      ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICo/y05fFCh8VkDN40cgTR5ZqcbxWvzp0+OzaGIn6vEQ root@unit
    ''];
  };

  # Rotate logs after 7 days
  services.journald.extraConfig = "SystemMaxFiles=7";

  # Import other configuration modules
  imports = [
    ./modules/hardware-configuration.nix
    ./modules/networking.nix
    ./modules/periodic.nix
  ];

}