From c0ef1f947903325d9cdc84edf011041b52d59fa3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Kr=C3=BCger?= <mkg20001@gmail.com>
Date: Sun, 24 Dec 2023 13:54:48 +0100
Subject: [PATCH] nixos/network-interfaces: add assertion if used in after or
 wants

---
 nixos/modules/system/boot/systemd.nix | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/nixos/modules/system/boot/systemd.nix b/nixos/modules/system/boot/systemd.nix
index 87333999313e..c3902007906a 100644
--- a/nixos/modules/system/boot/systemd.nix
+++ b/nixos/modules/system/boot/systemd.nix
@@ -451,6 +451,21 @@ in
         cfg.services
     );
 
+    assertions = concatLists (
+      mapAttrsToList
+        (name: service:
+          map (message: {
+            assertion = false;
+            inherit message;
+          }) (concatLists [
+            (optional ((builtins.elem "network-interfaces.target" service.after) || (builtins.elem "network-interfaces.target" service.wants))
+              "Service '${name}.service' is using the deprecated target network-interfaces.target, which no longer exists. Using network.target is recommended instead."
+            )
+          ])
+        )
+        cfg.services
+    );
+
     system.build.units = cfg.units;
 
     system.nssModules = [ cfg.package.out ];