From 2d618a28ad80f286fd6d7972fbcaeefdb776bb17 Mon Sep 17 00:00:00 2001
From: oddlama <oddlama@oddlama.org>
Date: Mon, 29 May 2023 16:20:36 +0200
Subject: [PATCH] fix: only generate mdns zone if necessary

---
 hosts/common/core/resolved.nix | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/hosts/common/core/resolved.nix b/hosts/common/core/resolved.nix
index c2c9698..1410059 100644
--- a/hosts/common/core/resolved.nix
+++ b/hosts/common/core/resolved.nix
@@ -59,17 +59,18 @@
       # name to the link name.
       ++ mapNetworks (x: config.systemd.network.networks.${x}.matchConfig.Name or null)
     );
-  in {
-    zones = lib.mkForce {
-      mdns.interfaces = mdnsInterfaces;
-    };
+  in
+    lib.mkIf (mdnsInterfaces != []) {
+      zones = lib.mkForce {
+        mdns.interfaces = mdnsInterfaces;
+      };
 
-    rules = lib.mkForce {
-      mdns-to-local = {
-        from = ["mdns"];
-        to = ["local"];
-        allowedUDPPorts = [5353];
+      rules = lib.mkForce {
+        mdns-to-local = {
+          from = ["mdns"];
+          to = ["local"];
+          allowedUDPPorts = [5353];
+        };
       };
     };
-  };
 }