OSAuto, sane nix defaults

nixosModules/automatic/default.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, lib, ... }:
+{ config, pkgs, lib, inputs, ... }:
 
 {
   options.system = {
@@ -9,7 +9,7 @@
       "Enable if you are running a non-EFI system";
     users.bigWheels = lib.mkOption { default = []; };
   };
-  
+
   config = lib.mkMerge [
     (lib.mkIf config.system.isNonEFI {
       boot.loader.grub.enable = false;
@@ -29,15 +29,26 @@
 
       # Packages & Default Packages
       nixpkgs.config.allowUnfree = true;
+      nix = {
+        registry.nixpkgs.flake = inputs.nixpkgs;
+        gc = { automatic = true; options = "--delete-older-than 5d"; };
+        channel.enable = false;
+        settings = {
+          auto-optimise-store = true;
+          keep-going = true;
+          use-xdg-base-directories = true;
+          experimental-features = [
+            "flakes"
+            "nix-command"
+          ];
+        };
+      };
       environment.systemPackages = with pkgs; [
         git
         neovim
         xdg-user-dirs
       ] ++ config.system.extraPkgs;
 
-      # XDG Compliance
-      nix.settings.use-xdg-base-directories = true;
-
       users = {
         users = builtins.listToAttrs (map (
           user: {