dix

profiles/base/upgrade-diff.nix

@@ -1,14 +1,31 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 {
 
+  # dix: https://github.com/faukah/dix
+  # rust based
+  # module from https://github.com/getchoo/borealis/blob/a35749aa6280fbe4cbe72291bb9c4cc643780c76/modules/nixos/custom/activation-diff.nix
+
   # nvd: https://discourse.nixos.org/t/nvd-simple-nix-nixos-version-diff-tool/12397
+  # python based
   # module from https://github.com/luishfonseca/dotfiles/blob/ab7625ec406b48493eda701911ad1cd017ce5bc1/modules/upgrade-diff.nix
+
   # gated on formatAttr which is set by nixos-generators
-  system.activationScripts.diff = lib.mkIf ((config.formatAttr or null) == null) {
+  system.activationScripts.show-nixos-closure-diff = lib.mkIf ((config.formatAttr or null) == null) {
     supportsDryActivation = true;
-    text = ''
-      ${pkgs.nvd}/bin/nvd --nix-bin-dir=${pkgs.nix}/bin diff /run/current-system "$systemConfig"
-    '';
+    text =
+      if pkgs ? dix then
+        ''
+          ${pkgs.dix}/bin/dix /run/current-system "$systemConfig"
+        ''
+      else
+        ''
+          ${pkgs.nvd}/bin/nvd --nix-bin-dir=${pkgs.nix}/bin diff /run/current-system "$systemConfig"
+        '';
   };
 
 }