PiConfig.nix

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

let
  user = "nixos";
  password = "nixos";
  SSID = "MyBox";
  SSIDpassword = "...";
  interface = "wlan0";
  hostname = "MyPi";
in {
  imports = ["${fetchTarball "https://github.com/NixOS/nixos-hardware/archive/936e4649098d6a5e0762058cb7687be1b2d90550.tar.gz" }/raspberry-pi/4"];

  fileSystems = {
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
      options = [ "noatime" ];
    };
  };

  networking = {
    hostName = hostname;
    wireless = {
      enable = true;
      networks."${SSID}".psk = SSIDpassword;
      interfaces = [ interface ];
    };
  };

  environment.systemPackages = with pkgs; [ vim ];

  services.openssh.enable = true;

  users = {
    mutableUsers = false;
    users."${user}" = {
      isNormalUser = true;
      password = password;
      extraGroups = [ "wheel" ];
    };
  };

  # Enable GPU acceleration
  hardware.raspberry-pi."4".fkms-3d.enable = true;
  hardware.enableRedistributableFirmware = true;
  hardware.pulseaudio.enable = true;

  sound.enable = true;
  boot.loader.raspberryPi.firmwareConfig = ''
    dtparam=audio=on
  '';
  boot.kernelParams = [
    "console=ttyS1,115200n8"
  ];
}