hosts: features: upgrade-diff: use nvd for nicer outputs

Signed-off-by: Otavio Salvador <[email protected]>

hosts/features/required/upgrade-diff.nix

@@ -1,9 +1,14 @@
 # MIT Jörg Thalheim - https://github.com/Mic92/dotfiles/blob/c6cad4e57016945c4816c8ec6f0a94daaa0c3203/nixos/modules/upgrade-diff.nix
-{ pkgs, ... }:
+{ config, pkgs, ... }:
 {
-  system.activationScripts.diff = ''
-    if [[ -e /run/current-system ]]; then
-      ${pkgs.nix}/bin/nix --extra-experimental-features nix-command store diff-closures /run/current-system "$systemConfig"
-    fi
-  '';
+  system.activationScripts.diff = {
+    supportsDryActivation = true;
+    text = ''
+      if [[ -e /run/current-system ]]; then
+        echo "--- diff to current-system"
+        ${pkgs.nvd}/bin/nvd --nix-bin-dir=${config.nix.package}/bin diff /run/current-system "$systemConfig"
+        echo "---"
+      fi
+    '';
+  };
 }