[microvm] put vm creation into function

machines/configuration.nix

@@ -41,12 +41,33 @@ let
   ];
   defaultModules = baseModules;
 
-  defaultMicroVMModules = [
+  makeMicroVM = hostName: ipv4Addr: modules: [
     inputs.microvm.nixosModules.microvm
     {
-      microvm.hypervisor = "qemu";
+      microvm = {
+        hypervisor = "qemu";
+        interfaces = [
+          {
+            type = "tap";
+            id = "vm-${hostName}";
+            mac = "02:00:00:00:00:01";
+          }
+        ];
+      };
+      
+      systemd.network.enable = true;
+      
+      systemd.network.networks."20-lan" = {
+        matchConfig.Type = "ether";
+        networkConfig = {
+          Address = [ "${ipv4Addr}/24" ];
+          Gateway = "10.0.0.1";
+          DNS = ["1.1.1.1"];
+          DHCP = "no";
+        };
+      };
     }
-  ] ++ defaultModules;
+  ] ++ defaultModules ++ modules;
 in
 {
   louise = nixosSystem {
@@ -60,33 +81,8 @@ in
   durruti = nixosSystem {
     system = "x86_64-linux";
     specialArgs.inputs = inputs;
-    modules = defaultMicroVMModules ++ [
+    modules = makeMicroVM "durruti" "10.0.0.5" [
       ./durruti/configuration.nix
-
-      {
-        microvm = {
-          interfaces = [
-            {
-              type = "tap";
-              id = "vm-test1";
-              mac = "02:00:00:00:00:01";
-            }
-          ];
-        };
-        
-        systemd.network.enable = true;
-        
-        systemd.network.networks."20-lan" = {
-          matchConfig.Type = "ether";
-          networkConfig = {
-            Address = ["10.0.0.3/24" "2001:db8::b/64"];
-            Gateway = "10.0.0.1";
-            DNS = ["1.1.1.1"];
-            IPv6AcceptRA = true;
-            DHCP = "no";
-          };
-        };
-      }
     ];
   };