From 1461a8401c9a489429b770e4a2fe455af50a53e4 Mon Sep 17 00:00:00 2001
From: Grimmauld <Grimmauld@grimmauld.de>
Date: Wed, 21 May 2025 13:44:58 +0200
Subject: [PATCH] udevCheckHook: guard platform

It is technically possible to guard all udevCheckHook usages behind
`lib.optionals (lib.meta.availableOn stdenv.buildPlatform systemdMinimal)`.

However, doing this is hard to read, clunky, and hard to discover.
*Not* doing such a guard would mean cross-compilation darwin -> linux breaks.
The workaround here is to just accept any udev rules if they can't be properly checked.
---
 pkgs/by-name/ud/udevCheckHook/hook.sh     |  2 +-
 pkgs/by-name/ud/udevCheckHook/package.nix | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/pkgs/by-name/ud/udevCheckHook/hook.sh b/pkgs/by-name/ud/udevCheckHook/hook.sh
index 507e0292b8c89..bdb8e9c1f746f 100644
--- a/pkgs/by-name/ud/udevCheckHook/hook.sh
+++ b/pkgs/by-name/ud/udevCheckHook/hook.sh
@@ -21,7 +21,7 @@ udevCheckHook() {
     echo Finished udevCheckPhase
 }
 
-if [[ -z "${dontUdevCheck-}" ]]; then
+if [[ -z "${dontUdevCheck-}" && -n "@udevadm@" ]]; then
     echo "Using udevCheckHook"
     preInstallCheckHooks+=(udevCheckHook)
 fi
diff --git a/pkgs/by-name/ud/udevCheckHook/package.nix b/pkgs/by-name/ud/udevCheckHook/package.nix
index 61a82530cdd33..261a503595eab 100644
--- a/pkgs/by-name/ud/udevCheckHook/package.nix
+++ b/pkgs/by-name/ud/udevCheckHook/package.nix
@@ -2,12 +2,20 @@
   lib,
   makeSetupHook,
   systemdMinimal,
+  udev,
+  stdenv,
 }:
-
+let
+  # udev rules can only be checked if systemd (specifically, 'udevadm') can be executed on build platform
+  # if udev is not available on hostPlatform, there is no point in checking rules
+  applyHook =
+    lib.meta.availableOn stdenv.hostPlatform udev
+    && lib.meta.availableOn stdenv.buildPlatform systemdMinimal;
+in
 makeSetupHook {
   name = "udev-check-hook";
   substitutions = {
-    udevadm = lib.getExe' systemdMinimal "udevadm";
+    udevadm = if applyHook then lib.getExe' systemdMinimal "udevadm" else "";
   };
   meta = {
     description = "check validity of udev rules in outputs";