From 141c841c29ce144be2c8842f18b30480ae516e37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20Krop=C3=A1=C4=8Dek?= <kropikuba@gmail.com>
Date: Sun, 22 Dec 2024 15:21:15 +0100
Subject: [PATCH] added defaultGateway

---
 hosts/hydra/default.nix             |  1 +
 nixosModules/networking/default.nix | 27 ++++++++++++++++++++-------
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/hosts/hydra/default.nix b/hosts/hydra/default.nix
index fb5ffcc..4334057 100644
--- a/hosts/hydra/default.nix
+++ b/hosts/hydra/default.nix
@@ -5,6 +5,7 @@
       ipv4 = {
         address = "192.168.1.160";
         prefixLength = 24;
+        defaultGateway = "192.168.1.1";
       };
     };
   };
diff --git a/nixosModules/networking/default.nix b/nixosModules/networking/default.nix
index 46c80a6..aa1878c 100644
--- a/nixosModules/networking/default.nix
+++ b/nixosModules/networking/default.nix
@@ -18,6 +18,12 @@ let
       default = null;
       example = if version == 4 then 24 else 64;
     };
+    defaultGateway = lib.mkOption {
+      type = lib.types.nullOr lib.types.str;
+      description = "The defautl gateway IPv${version}";
+      default = null;
+      example = if version == 4 then "192.168.1.1" else null;
+    };
   };
 in
 {
@@ -34,9 +40,10 @@ in
 
     assertions = [
       {
-        assertion = !(cfg.ipv4.address == null || cfg.ipv4.prefixLength == null);
+        assertion =
+          !(cfg.ipv4.address == null || cfg.ipv4.prefixLength == null || cfg.ipv4.defaultGateway == null);
         message = ''
-          You need to provide valid values for both `address` and `prefixLength` in `kropcloud.networking.ipv4`
+          You need to provide valid values for `address`, `prefixLength` and `defaultGateway` in `kropcloud.networking.ipv4`
           when either is set.
         '';
       }
@@ -57,11 +64,17 @@ in
           ];
         };
       };
-      useDHCP = (cfg.ipv4.address == null || cfg.ipv4.prefixLength == null);
-      nameservers = [
-        "8.8.8.8"
-        "1.1.1.1"
-      ];
+      useDHCP = (
+        cfg.ipv4.address == null || cfg.ipv4.prefixLength == null || cfg.ipv4.defaultGateway == null
+      );
+      defaultGateway = lib.mkIf (cfg.ipv4.defaultGateway != null) { address = cfg.ipv4.defaultGateway; };
+      nameservers =
+        lib.mkIf
+          (cfg.ipv4.address != null || cfg.ipv4.prefixLength != null || cfg.ipv4.defaultGateway != null)
+          [
+            "8.8.8.8"
+            "1.1.1.1"
+          ];
     };
   };
 }