From b2f67d3f4847c61bf0b3fc4c41796c87df9f92b3 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Wed, 22 Nov 2023 23:39:43 +0300
Subject: [PATCH] nixos/nix-serve: fix module compatibility with unflaked Nix

The option `extra-allowed-users` was introduced in Nix 2.4, and fails
config validation on Nix 2.3.
---
 nixos/modules/services/networking/nix-serve.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/networking/nix-serve.nix b/nixos/modules/services/networking/nix-serve.nix
index 8c4352bc95e8..86bb603e1271 100644
--- a/nixos/modules/services/networking/nix-serve.nix
+++ b/nixos/modules/services/networking/nix-serve.nix
@@ -67,7 +67,9 @@ in
   };
 
   config = mkIf cfg.enable {
-    nix.settings.extra-allowed-users = [ "nix-serve" ];
+    nix.settings = lib.optionalAttrs (lib.versionAtLeast config.nix.package.version "2.4") {
+      extra-allowed-users = [ "nix-serve" ];
+    };
 
     systemd.services.nix-serve = {
       description = "nix-serve binary cache server";