From a7be658b1bc081bbf3cb33a3407bfd7c64a551d1 Mon Sep 17 00:00:00 2001
From: Trolli Schmittlauch <t.schmittlauch@orlives.de>
Date: Sat, 13 Jul 2024 01:12:43 +0200
Subject: [PATCH] nixos: show diff to current system at activation time

---
 common/default.nix      | 1 +
 common/upgrade-diff.nix | 9 +++++++++
 2 files changed, 10 insertions(+)
 create mode 100644 common/upgrade-diff.nix

diff --git a/common/default.nix b/common/default.nix
index 594e9dd..a39cd77 100644
--- a/common/default.nix
+++ b/common/default.nix
@@ -14,6 +14,7 @@ in
     ./packages.nix
     ./nitrokey.nix
     ./nix-settings.nix
+    ./upgrade-diff.nix
   ];
 
   services.davfs2.enable = true;
diff --git a/common/upgrade-diff.nix b/common/upgrade-diff.nix
new file mode 100644
index 0000000..a66725f
--- /dev/null
+++ b/common/upgrade-diff.nix
@@ -0,0 +1,9 @@
+# MIT Jörg Thalheim - https://github.com/Mic92/dotfiles/blob/c6cad4e57016945c4816c8ec6f0a94daaa0c3203/nixos/modules/upgrade-diff.nix
+{ pkgs, ... }:
+{
+  system.activationScripts.diff = ''
+    if [[ -e /run/current-system ]]; then
+      ${pkgs.nix}/bin/nix store diff-closures /run/current-system "$systemConfig"
+    fi
+  '';
+}