nixpkgs/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")
  '';
})