flake: set options for both grub and systemd-boot

hosts/hermit/configuration.nix

@@ -27,6 +27,7 @@
   modules = {
     desktops.hyprland.enable = true;
     system = {
+      boot.grub.enable = true;
       impermanence.enable = false;
       services = {
         nextcloud.enable = true;
@@ -63,7 +64,6 @@
       locate.enable = true;
       kanata.enable = true;
 
-
       media.mpd = {
         enable = true;
       };

hosts/temperance/configuration.nix

@@ -44,6 +44,9 @@ in {
   modules = {
     system = {
       impermanence.enable = true;
+      boot = {
+        systemd-boot.enable = true;
+      };
       services = {
         nextcloud.enable = true;
       };

hosts/tower/configuration.nix

@@ -25,10 +25,11 @@
     mainUser.gitSigningKey = "";
   };
   modules = {
-      services = {
-        locate.enable = true;
-      };
+    services = {
+      locate.enable = true;
+    };
     system = {
+      boot.grub.enable = true;
       services.forgejo.enable = true;
       programs = {
         editors = {

modules/system/boot/module.nix

@@ -1,34 +1,54 @@
 {
+  config,
   lib,
   pkgs,
   ...
 }: let
   inherit (lib.modules) mkForce;
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkEnableOption;
+  cfg = config.modules.system.boot;
 in {
-  boot = {
-    initrd = {
-      verbose = true;
-      systemd.enable = true;
-    };
-    loader = {
-      efi.canTouchEfiVariables = true;
-      systemd-boot = {
-        enable = true;
-        editor = mkForce false;
-        configurationLimit = 5;
+  options.modules.system.boot = {
+    grub.enable = mkEnableOption "Grub, a bloated boot loader";
+    systemd-boot.enable = mkEnableOption "Poetteringboot";
+  };
+  config = {
+    assertions = [
+      {
+        assertion = cfg.systemd-boot.enable || cfg.grub.enable;
+        message = "No bootloader is enabled.";
+      }
+      {
+        assertion = cfg.systemd-boot.enable -> !cfg.grub.enable && cfg.grub.enable -> !cfg.systemd-boot.enable;
+        message = "Please enable only ONE of systemd-boot or grub.";
+      }
+    ];
+    boot = {
+      initrd = {
+        verbose = true;
+        systemd.enable = true;
       };
-      grub = {
+      loader = {
+        efi.canTouchEfiVariables = true;
+        systemd-boot = {
+          enable = cfg.systemd-boot.enable;
+          editor = mkForce false;
+          configurationLimit = 5;
+        };
+        grub = {
+          enable = cfg.grub.enable;
+          efiSupport = true;
+          device = "nodev";
+          configurationLimit = 5;
+        };
+      };
+      plymouth = {
         enable = false;
-        efiSupport = true;
-        device = "nodev";
-        configurationLimit = 5;
+        # font = "${pkgs.jetbrains-mono}/share/fonts/truetype/JetBrainsMono-Regular.ttf";
+        themePackages = [pkgs.plymouth-matrix-theme];
+        theme = "matrix";
       };
     };
-    plymouth = {
-      enable = false;
-      # font = "${pkgs.jetbrains-mono}/share/fonts/truetype/JetBrainsMono-Regular.ttf";
-      themePackages = [pkgs.plymouth-matrix-theme];
-      theme = "matrix";
-    };
   };
 }