blah

workstation/default.nix

@@ -13,6 +13,7 @@ in
     [
       ./detect-reboot-needed.nix
       ./systemd.nix
+      ./upgrade-diff.nix
     ];
   # Bootloader.
   boot.loader.systemd-boot.enable = true;
@@ -182,6 +183,7 @@ in
     nerdfonts
     nextcloud-client
     noto-fonts
+    nvd
     obsidian
     pasystray
     pavucontrol

workstation/upgrade-diff.nix

@@ -0,0 +1,8 @@
+{ pkgs, ... }: {
+  system.activationScripts.diff = {
+    supportsDryActivation = true;
+    text = ''
+      ${pkgs.nvd}/bin/nvd --nix-bin-dir=${pkgs.nix}/bin diff /run/current-system "$systemConfig"
+    '';
+  };
+}