nixos/tests/containers-physical_interfaces: add autoStart test

          };

        };

      };

    autoStart =

      { ... }:

      {

        virtualisation.vlans = [ 1 ];

        networking.useNetworkd = true;

        systemd.network.netdevs."20-dummy-test".netdevConfig = {

          Name = "dummy-test";

          Kind = "dummy";

        };

        containers.autoStart = {

          autoStart = true;

          privateNetwork = true;

          interfaces = [ "dummy-test" ];

          config = {

            networking.firewall.enable = false;

          };

        };

      };

    bridged =

      { ... }:

      {

        # that the device is present in the container.

        server.succeed("nixos-container run server -- ip a show dev eth1 >&2")

    with subtest("Simple dummy interface is up, with autoStart enabled"):

        autoStart.wait_for_unit("container@autoStart")

        # Check if any dependency of container@autoStart.service timed out.

        # If a non-existing .device dependency is set in Wants, systemd will

        # wait until that unit times out, resulting a delay of the container.

        autoStart.fail("journalctl _PID=1 | grep sys-subsystem-net-devices | grep 'timed out'")

        autoStart.succeed("nixos-container run autoStart -- ip a show dev dummy-test >&2")

    with subtest("Physical device in bridge in container can ping server"):

        bridged.wait_for_unit("default.target")

        bridged.succeed("nixos-container start bridged")