infrastructure/modules/nixos/dgn-hardware.nix

# SPDX-FileCopyrightText: 2024 Tom Hubrecht <tom.hubrecht@dgnum.eu>
#
# SPDX-License-Identifier: EUPL-1.2

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

let
  inherit (lib)
    mkEnableOption
    mkIf
    mkMerge
    mkOption
    ;
  inherit (lib.types) listOf str;

  cfg = config.dgn-hardware;
in
{
  options.dgn-hardware = {
    enable = mkEnableOption "default hardware configuration." // {
      default = true;
    };

    useSystemd = mkEnableOption "sytemd boot and configuration." // {
      default = true;
    };

    useZfs = mkEnableOption "zfs configuration.";
    useBcachefs = mkEnableOption "bcachefs configuration";

    zfsPools = mkOption {
      type = listOf str;
      default = [
        "fast01"
        "work01"
      ];
      description = ''
        ZFS pools present on the machine
      '';
    };
  };

  config = mkIf cfg.enable (mkMerge [
    {
      microvm.host.enable = lib.mkDefault false;
      hardware.enableRedistributableFirmware = true;
      hardware.cpu.intel.updateMicrocode = true;

      nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";

      boot = {
        initrd.availableKernelModules = [
          "ata_piix"
          "uhci_hcd"
          "ehci_pci"
          "virtio_pci"
          "ahci"
          "virtio_blk"
        ];
        kernelModules = [ "kvm-intel" ];
        kernelParams = [
          "cgroup_enable=cpu"
          "cgroup_enable=cpuset"
          "cgroup_enable=memory"
          "cgroup_memory=1"
        ];
      };
    }

    (mkIf cfg.useSystemd {
      boot.loader = {
        systemd-boot.enable = true;
        efi.canTouchEfiVariables = true;
      };
    })

    (mkIf cfg.useBcachefs {
      boot.supportedFilesystems = [ "bcachefs" ];
      boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_7;
    })

    (mkIf cfg.useZfs {
      boot = {
        supportedFilesystems = [ "zfs" ];

        zfs = {
          forceImportRoot = false;
          extraPools = cfg.zfsPools;
          package = pkgs.zfs_2_1;
        };
      };
    })
  ]);
}