nixpkgs/nixos/tests/lxd-nftables.nix

# This test makes sure that lxd stops implicitly depending on iptables when
# user enabled nftables.
#
# It has been extracted from `lxd.nix` for clarity, and because switching from
# iptables to nftables requires a full reboot, which is a bit hard inside NixOS
# tests.

import ./make-test-python.nix ({ pkgs, ...} : {
  name = "lxd-nftables";

  meta = with pkgs.stdenv.lib.maintainers; {
    maintainers = [ patryk27 ];
  };

  machine = { lib, ... }: {
    virtualisation = {
      lxd.enable = true;
    };

    networking = {
      firewall.enable = false;
      nftables.enable = true;
      nftables.ruleset = ''
        table inet filter {
          chain incoming {
            type filter hook input priority 0;
            policy accept;
          }

          chain forward {
            type filter hook forward priority 0;
            policy accept;
          }

          chain output {
            type filter hook output priority 0;
            policy accept;
          }
        }
      '';
    };
  };

  testScript = ''
    machine.wait_for_unit("network.target")

    with subtest("When nftables are enabled, lxd doesn't depend on iptables anymore"):
        machine.succeed("lsmod | grep nf_tables")
        machine.fail("lsmod | grep ip_tables")
  '';
})