pass nodes to config and have defaults for the IPs

flake.nix

@@ -53,14 +53,33 @@
             description = "All my NixoS machines";
             specialArgs = {
               inherit inputs outputs;
+              nodes = colmenaHive.nodes;
               pkgs-unstable = import nixpkgs-unstable { system = "x86_64-linux"; };
             };
             nixpkgs = import nixpkgs { system = "x86_64-linux"; };
           };
 
-          defaults = { lib, config, name, ... }: {
+          defaults = { lib, config, name, nodes, ... }: {
             imports = [ ./hosts/${name} ./profiles/base ];
 
+            options.cherrykitten = {
+              primaryIPv4 = lib.mkOption {
+                type = lib.types.nullOr lib.types.str;
+                default =
+                  if (config.networking.interfaces ? eth0) then
+                    (builtins.elemAt config.networking.interfaces.eth0.ipv4.addresses 0).address
+                  else null;
+              };
+              primaryIPv6 = lib.mkOption {
+                type = lib.types.nullOr lib.types.str;
+                default =
+                  if (config.networking.interfaces ? eth0) then
+                    (builtins.elemAt config.networking.interfaces.eth0.ipv6.addresses 0).address
+                  else null;
+              };
+            };
+
+            config = {
               networking.hostName = name;
               networking.domain = "cherrykitten.xyz";
 
@@ -69,6 +88,7 @@
                 pkgs-unstable = import nixpkgs-unstable { system = "x86_64-linux"; };
               };
             };
+          };
         } // hosts;
 
       colmenaHive = inputs.colmena.lib.makeHive colmena;