{ pkgs, ... }: 
let 
in {
  # from https://github.com/tpwrules/nixos-m1/blob/main/nix/m1-support/firmware/default.nix
  nixpkgs.overlays = [ (self: super: {
    linux-mbp = super.callPackage ./packages/linux-mbp { };
    apple-bce = super.callPackage ./packages/apple-bce { kernel = self.linux-mbp; };
    apple-ib-drv = super.callPackage ./packages/apple-ib-drv { kernel = self.linux-mbp; };
  }) ];

  hardware.firmware = [
    (pkgs.stdenvNoCC.mkDerivation {
      name = "firmware";
      buildCommand = ''
        mkdir -p $out/lib/firmware
        FIRMWARE=`echo ${./.}/*firmware*.tar`
        if [ -e "$FIRMWARE" ]; then
          tar xf "$FIRMWARE" -C $out/lib/firmware
          # move firmware for my specific device 
          mv $out/lib/firmware/C-4377__s-B3/* $out/lib/firmware 
          find $out/lib/firmware -depth -type d -empty -delete
        else
          # stop nixos infra from breaking when it doesn't have any firmware
          touch $out/lib/firmware/.dummy
        fi
      '';
    })
  ];

  boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-mbp;
  boot.extraModulePackages = [ pkgs.apple-bce pkgs.apple-ib-drv ];
  boot.initrd.kernelModules = [ "apple_bce" "apple-ibridge" "apple-ib-tb" ];
}