clanCore: Make fact generation for machine.id optional

nixosModules/clanCore/machine_id.nix

@@ -35,7 +35,7 @@ in
       lib.mkDefault
         config.clan.core.facts.services."machine_id".public."diskId".value;
 
-    clan.core.facts.services."machine_id" = {
+    clan.core.facts.services."machine_id" = lib.mkIf (cfg.id == null) {
       public."machine_id" = { };
       public."diskId" = { };
       generator.path = [
@@ -49,7 +49,8 @@ in
       '';
     };
 
-    networking.hostId = lib.mkIf (cfg.id != null) (lib.mkDefault cfg.idShort);
+    # TODO: Should we set it by default?
+    # networking.hostId = lib.mkIf (cfg.id != null) (lib.mkDefault cfg.idShort);
 
     boot.kernelParams = lib.mkIf (cfg.id != null) [
       ''systemd.machine_id=${cfg.id}''

nixosModules/flake-module.nix

@@ -18,6 +18,10 @@
         { pkgs, lib, ... }:
         {
           clan.core.clanPkgs = lib.mkDefault self.packages.${pkgs.hostPlatform.system};
+          clan.core.machine = {
+            id = "bad660856cd348539f74bc7881f4a482";
+            diskId = "c4c47b";
+          };
         }
       )
     ];