depot/nixos/tests/systemd-initrd-bridge.nix

import ./make-test-python.nix (
  { lib, ... }:
  {
    name = "systemd-initrd-bridge";
    meta.maintainers = [ lib.maintainers.majiir ];

    # Tests bridge interface configuration in systemd-initrd.
    #
    # The 'a' and 'b' nodes are connected to a 'bridge' node through different
    # links. The 'bridge' node configures a bridge across them. It waits forever
    # in initrd (stage 1) with networking enabled. 'a' and 'b' ping 'bridge' to
    # test connectivity with the bridge interface. Then, 'a' pings 'b' to test
    # the bridge itself.

    nodes = {
      bridge =
        { config, lib, ... }:
        {
          boot.initrd.systemd.enable = true;
          boot.initrd.network.enable = true;
          boot.initrd.systemd.services.boot-blocker = {
            before = [ "initrd.target" ];
            wantedBy = [ "initrd.target" ];
            script = "sleep infinity";
            serviceConfig.Type = "oneshot";
          };

          networking.primaryIPAddress = "192.168.1.${toString config.virtualisation.test.nodeNumber}";

          virtualisation.vlans = [
            1
            2
          ];
          networking.bridges.br0.interfaces = [
            "eth1"
            "eth2"
          ];

          networking.interfaces = {
            eth1.ipv4.addresses = lib.mkForce [ ];
            eth2.ipv4.addresses = lib.mkForce [ ];
            br0.ipv4.addresses = [
              {
                address = config.networking.primaryIPAddress;
                prefixLength = 24;
              }
            ];
          };
        };

      a = {
        virtualisation.vlans = [ 1 ];
      };

      b =
        { config, ... }:
        {
          virtualisation.vlans = [ 2 ];
          networking.primaryIPAddress = lib.mkForce "192.168.1.${toString config.virtualisation.test.nodeNumber}";
          networking.interfaces.eth1.ipv4.addresses = lib.mkForce [
            {
              address = config.networking.primaryIPAddress;
              prefixLength = 24;
            }
          ];
        };
    };

    testScript = ''
      start_all()
      a.wait_for_unit("network.target")
      b.wait_for_unit("network.target")

      a.succeed("ping -n -w 10 -c 1 bridge >&2")
      b.succeed("ping -n -w 10 -c 1 bridge >&2")

      a.succeed("ping -n -w 10 -c 1 b >&2")
    '';
  }
)