First test of all machines

modules/boot/default.nix

@@ -1,6 +1,8 @@
-{inputs, ...}: {
+{inputs, headless, ...}: {
   imports = [
-    ./loader/systemd.nix
     ./greeter/sddm.nix
+    ./refind.nix
+
+    ( if headless then ./loader/grub.nix else ./loader/systemd.nix )
   ];
 }

modules/boot/loader/grub.nix

@@ -0,0 +1,23 @@
+{
+  inputs,
+  outputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkIf mkOption types;
+  cfg = config.horseman.boot.loader.grub;
+in {
+  options = {
+    horseman.boot.loader.grub = {
+      enable = mkEnableOption "Sets grub as the bootloader";
+    };
+  };
+
+  config = {
+    boot.loader.grub.enable = true;
+    boot.loader.grub.device = "/dev/sda";
+    boot.loader.grub.configurationLimit = 10;
+  };
+}

modules/boot/refind.nix

@@ -0,0 +1,24 @@
+{
+  inputs,
+  outputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkIf mkOption types;
+  cfg = config.horseman.boot.refind;
+in {
+  options = {
+    horseman.boot.refind = {
+      enable = mkEnableOption "Enables rEFInd, the boot manager";
+    };
+  };
+
+  config = {
+    environment.systemPackages = with pkgs; [
+      refind
+      efibootmgr
+    ];
+  };
+}