From a555914285e9d29a88c85763cbb507f0df71793c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Tue, 4 Nov 2025 19:26:31 +0100
Subject: [PATCH] nixos/facter: make hasCPUFeature more fault-tolerant

Add default value for features attribute in hasCPUFeature function
to handle CPU records that might not have a features field, preventing
errors when the report structure varies.
---
 nixos/modules/hardware/facter/virtualisation.nix | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/hardware/facter/virtualisation.nix b/nixos/modules/hardware/facter/virtualisation.nix
index 9f418ecf3488..e1a9a1647708 100644
--- a/nixos/modules/hardware/facter/virtualisation.nix
+++ b/nixos/modules/hardware/facter/virtualisation.nix
@@ -57,7 +57,14 @@ in
     boot.kernelModules =
       let
         hasCPUFeature =
-          feature: lib.any ({ features, ... }: lib.elem feature features) (report.hardware.cpu or [ ]);
+          feature:
+          lib.any (
+            {
+              features ? [ ],
+              ...
+            }:
+            lib.elem feature features
+          ) (report.hardware.cpu or [ ]);
       in
       lib.mkMerge [
         (lib.mkIf (hasCPUFeature "vmx") [ "kvm-intel" ])