From 1dbb1741f2ac20c1a703c7db6d370d4031634160 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kier=C3=A1n=20Meinhardt?=
 <kieran.meinhardt@applicative.systems>
Date: Tue, 27 Jan 2026 16:21:44 +0100
Subject: [PATCH] nixos/test-driver: improve overlapping machine name warning

---
 nixos/lib/testing/driver.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nixos/lib/testing/driver.nix b/nixos/lib/testing/driver.nix
index db56f55307c8..8a3f40e7c44a 100644
--- a/nixos/lib/testing/driver.nix
+++ b/nixos/lib/testing/driver.nix
@@ -43,7 +43,8 @@ let
       overlappingNames = lib.intersectLists vmMachineNames containerMachineNames;
     in
     assert (
-      lib.asserts.assertMsg (overlappingNames == [ ]) "vm names and container names must not overlap"
+      lib.asserts.assertMsg (overlappingNames == [ ])
+        "Names of QEMU VM nodes and systemd-nspawn containers must not overlap. Overlapping names: ${toString overlappingNames}"
     );
     vmMachineNames ++ containerMachineNames;