From 4080d35d2b988fc760ea7b715111233967283136 Mon Sep 17 00:00:00 2001
From: Josh Hoffer <jhoffer@sansorgan.es>
Date: Fri, 13 Sep 2024 20:58:36 -0700
Subject: [PATCH] nixos/udev: only restart when udev rules change

Only restart `systemd-udevd.service` if udev rules in `/etc/udev/rules`
actually changed. The paths of `services.udev.packages` may change
frequently but the resulting udev rules built by `udevRulesFor`
likely change less often.

This has the added benefit of not adding `services.udev.packages` to
the system closure if they are only used for their udev rules
(issue #308937).
---
 nixos/modules/services/hardware/udev.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/services/hardware/udev.nix b/nixos/modules/services/hardware/udev.nix
index e3f356ade6788..a532f629efd06 100644
--- a/nixos/modules/services/hardware/udev.nix
+++ b/nixos/modules/services/hardware/udev.nix
@@ -434,7 +434,7 @@ in
     '';
 
     systemd.services.systemd-udevd =
-      { restartTriggers = cfg.packages;
+      { restartTriggers = [ config.environment.etc."udev/rules.d".source ];
       };
 
   };