Hallucinate a boot loader or some shit

configuration.nix

@@ -2,7 +2,8 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running 'nixos-help').
 
-{ config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
+with lib;
 
 let
   unstable = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz") { config = { allowUnfree = true; }; };
@@ -14,10 +15,23 @@ in
     /etc/nixos/hardware-configuration.nix
   ];
 
-  # Bootloader.
-  boot.loader.grub.enable = false;
-  # boot.loader.grub.device = "/dev/sda";
-  # boot.loader.grub.useOSProber = true;
+  boot = {
+    kernelPackages = mkDefault pkgs.linuxPackages_latest;
+
+    loader = {
+      efi.canTouchEfiVariables = mkDefault true;
+      grub = {
+        enable = mkDefault true;
+        default = mkDefault "saved";
+        device = mkDefault "nodev";
+        extraEntries = mkDefault "GRUB_SAVEDEFAULT=true";
+        efiSupport = mkDefault true;
+        useOSProber = mkDefault true;
+        theme = mkDefault "${pkgs.kdePackages.breeze-grub}/grub/themes/breeze";
+      };
+    };
+    supportedFilesystems = mkDefault [ "ntfs" ];
+  };
 
   networking.hostName = "nixos"; # Define your hostname.
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.