nixos/modules/vm.nix

{ lib, modulesPath, numbers, ... }:
with lib;

let
  makeNic = host: iface:
    let { matchMac, iface, media, ... } = numbers.api.hostIface host iface;
    in
      if media != "eth" then [] else
        [
          "-nic bridge,id=${iface},br=${iface},model=virtio,mac=${matchMac}"
        ];
  makeNics = host: concatMap (makeNic host) (numbers.api.hostIfaces host);
  makeQemuNetworkingOptions = host:
    (makeNics host) ++ [
      "-net nic,netdev=user.0,model=virtio"
      "-netdev user,id=user.0,\${QEMU_NET_OPTS:+,$QEMU_NET_OPTS}"
    ];
in

{
  imports = [
    "${modulesPath}/virtualisation/qemu-vm.nix"
    ./server.nix
  ];

  config = {
    virtualisation.graphics = false;
    virtualisation.qemu.networkingOptions = makeQemuNetworkingOptions config.networking.hostName;
  };
}