From fd4925111408439dc8a8b875a6c3c4aff970ff12 Mon Sep 17 00:00:00 2001
From: Seth Flynn <getchoo@tuta.io>
Date: Thu, 13 Feb 2025 21:07:48 -0500
Subject: modules: group services & traits into "custom" modules

---
 modules/nixos/custom/nvd-diff.nix | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 modules/nixos/custom/nvd-diff.nix

(limited to 'modules/nixos/custom/nvd-diff.nix')

diff --git a/modules/nixos/custom/nvd-diff.nix b/modules/nixos/custom/nvd-diff.nix
new file mode 100644
index 0000000..0e88d10
--- /dev/null
+++ b/modules/nixos/custom/nvd-diff.nix
@@ -0,0 +1,28 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.borealis.nvd-diff;
+in
+
+{
+  options.borealis.nvd-diff = {
+    enable = lib.mkEnableOption "`nvd` to show configuration diffs on upgrade";
+  };
+
+  config = lib.mkIf cfg.enable {
+    system.activationScripts."upgrade-diff" = {
+      supportsDryActivation = true;
+
+      text = ''
+        ${lib.getExe pkgs.nvd} \
+          --nix-bin-dir=${config.nix.package}/bin \
+          diff /run/current-system "$systemConfig"
+      '';
+    };
+  };
+}
-- 
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