fix: move bootloader to grub

hosts/xps15/configuration.nix

@@ -11,6 +11,25 @@ let
   loginShell = pkgs.writeShellScript "login-shell" ''
     exec $(getent passwd $(id -un) | cut -d: -f7) -l
   '';
+  grubTheme = pkgs.runCommand "grub-theme" {
+    nativeBuildInputs = [ pkgs.grub2 ];
+  } ''
+    mkdir -p $out
+    grub-mkfont -s 32 -o $out/font.pf2 ${../../fonts/berkeley-mono/BerkeleyMono-Regular.ttf}
+    cat > $out/theme.txt << 'EOF'
+    desktop-color: "#000000"
+
+    + boot_menu {
+      left = 30%
+      top = 30%
+      width = 40%
+      height = 40%
+      item_color = "#999999"
+      selected_item_color = "#ffffff"
+      icon_width = 0
+    }
+    EOF
+  '';
 in
 {
   imports = [
@@ -18,9 +37,15 @@ in
     ./hardware.nix
   ];
 
-  boot.loader.systemd-boot = {
+  boot.loader.grub = {
     enable = true;
+    efiSupport = true;
+    device = "nodev";
+    useOSProber = true;
     configurationLimit = 2;
+    theme = grubTheme;
+    font = ../../fonts/berkeley-mono/BerkeleyMono-Regular.ttf;
+    fontSize = 24;
   };
   boot.loader.efi.canTouchEfiVariables = true;
   boot.kernelParams = [