I should commit more frequently 🫣

modules/vm-ubuntu/default.nix

@@ -0,0 +1,34 @@
+{pkgs, ...}: {
+  virtualisation.libvirtd.enable = true;
+
+  networking.firewall.interfaces."wg0" = {
+    allowedTCPPorts = [
+      5900 # vnc by QEMU
+      2233
+      60022
+      8545
+    ];
+  };
+
+  systemd.services.vm-ubuntu = let
+    start-vm = pkgs.writeShellApplication {
+      name = "start-vm";
+      runtimeInputs = with pkgs; [qemu];
+      text = ''
+        qemu-system-x86_64 \
+          -enable-kvm \
+          -cpu host,kvm=on,hv-vendor_id="GenuineIntel" \
+          -smp 4 \
+          -m 8192 \
+          -nic user,model=virtio-net-pci,hostfwd=tcp::60022-:22,hostfwd=tcp::8545-:8545 \
+          -drive file=/var/lib/vm-ubuntu/ubuntu.qcow2
+      '';
+    };
+  in {
+    wantedBy = ["multi-user.target"];
+    after = ["network.target"];
+    serviceConfig = {
+      ExecStart = "${start-vm}/bin/start-vm";
+    };
+  };
+}