diff --git a/nix/topology.nix b/nix/topology.nix
index c0d5be7..fa2eba3 100644
--- a/nix/topology.nix
+++ b/nix/topology.nix
@@ -1,7 +1,6 @@
 { inputs, self, ... }:
 {
   imports = [
-    #inputs.flake-parts.flakeModules.easyOverlay
     inputs.nix-topology.flakeModule
   ];
 
@@ -9,9 +8,24 @@
   # nix build .#topology.x86_64-linux.config.output
 
   perSystem =
-    { system, ... }:
     {
-      #overlayAttrs = inputs.nix-topology.overlays.default;
+      system,
+      lib,
+      pkgs,
+      ...
+    }:
+    {
+
+      apps.topology = {
+        type = "app";
+        program = pkgs.writers.writeBashBin "topology" ''
+          ${lib.getExe pkgs.nix} build ${self}#topology.${system}.config.output
+          echo "result"
+          ls -lah ./result
+          ls -lah ./result/
+        '';
+      };
+
       topology.pkgs = import inputs.nixpkgs {
         inherit system;
         overlays = [ inputs.nix-topology.overlays.default ];