add nix-helper

flake.lock

@@ -494,11 +494,11 @@
       "locked": {
         "lastModified": 1,
         "narHash": "sha256-tqJYXR0mlrRwAOCqQDl2rdJWntnpWYVhMGyvaqvgUJE=",
-        "path": "./shells",
+        "path": "shells",
         "type": "path"
       },
       "original": {
-        "path": "./shells",
+        "path": "shells",
         "type": "path"
       }
     },

flake.nix

@@ -15,7 +15,7 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     shells = {
-      url = "path:./shells";
+      url = "path:shells";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     stylix = {

modules/system.nix

@@ -1,4 +1,4 @@
-{ pkgs, hostname, lib, ... }: {
+{ pkgs, hostname, username, lib, ... }: {
   networking.hostName = hostname; 
   boot = {
     loader = {
@@ -118,11 +118,15 @@
   services.udev.packages = [ pkgs.sane-airscan pkgs.utsushi ];
 
   services.udisks2.enable = true;
-  # do garbage collection weekly to keep disk usage low
-  nix.gc = {
-    automatic = lib.mkDefault true;
-    dates = lib.mkDefault "weekly";
-    options = lib.mkDefault "--delete-older-than 7d";
+
+  programs.nh = {
+    enable = true;
+    clean.enable = true;
+    clean.extraArgs = "--keep-since 4d --keep 3";
+  };
+
+  environment.sessionVariables = {
+    FLAKE = "/home/${username}/.dotfiles";
   };
 
   # Enable all packages