hosts/caesar: initial networking config; separate virt

hosts/caesar/default.nix

@@ -1,17 +1,16 @@
 {
   config,
-  lib,
   pkgs,
-  modulesPath,
+  lib,
   ...
-}: {
-  imports = [
-    (modulesPath + "/virtualisation/qemu-vm.nix")
-  ];
-
+}: let
+  inherit (lib.modules) mkForce;
+  inherit (lib.meta) getExe;
+in {
+  imports = [./virt.nix];
   config = {
-    zramSwap.enable = lib.mkForce false;
-    services.thermald.enable = lib.mkForce false;
+    zramSwap.enable = mkForce false;
+    services.thermald.enable = mkForce false;
 
     boot = {
       initrd.supportedFilesystems = ["ext4"];
@@ -23,31 +22,10 @@
       enable = true;
       enableCompletion = true;
       promptInit = ''
-        eval "$(${lib.getExe pkgs.starship} init zsh)"
+        eval "$(${getExe pkgs.starship} init zsh)"
       '';
     };
 
-    virtualisation = {
-      memorySize = 8000;
-      diskSize = 200000;
-      cores = 8;
-
-      # fs
-      useDefaultFilesystems = false;
-      rootDevice = "/dev/disk/by-label/NIXOS_ROOT";
-
-      fileSystems = {
-        "/" = {
-          device = "${config.virtualisation.rootDevice}";
-          fsType = "xfs";
-        };
-      };
-
-      interfaces = {
-        vm0.vlan = 1;
-      };
-    };
-
     boot.initrd.preLVMCommands = with pkgs; ''
       if ! test -b /dev/vda2; then
         ${pkgs.parted}/bin/parted --script /dev/vda -- mklabel msdos

hosts/caesar/virt.nix

@@ -0,0 +1,34 @@
+{
+  config,
+  modulesPath,
+  ...
+}: {
+  imports = [(modulesPath + "/virtualisation/qemu-vm.nix")];
+
+  virtualisation = {
+    memorySize = 8000;
+    diskSize = 200000;
+    cores = 8;
+
+    # fs
+    useDefaultFilesystems = false;
+    rootDevice = "/dev/disk/by-label/NIXOS_ROOT";
+
+    fileSystems = {
+      "/" = {
+        device = "${config.virtualisation.rootDevice}";
+        fsType = "xfs";
+      };
+    };
+
+    interfaces = {
+      vm0.vlan = 1;
+    };
+
+    qemu.networkingOptions = [
+      "-net nic,netdev=user.0,model=virtio"
+      "-netdev user,id=user.0,\${QEMU_NET_OPTS:+,$QEMU_NET_OPTS}"
+      "hostfwd=tcp::2222-:2222"
+    ];
+  };
+}