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{ system ? builtins.currentSystem
, config ? {}
, pkgs ? import ../.. { inherit system config; }
# bool: whether to use networkd in the tests
, networkd ? false
} @ args:

# Test whether `avahi-daemon' and `libnss-mdns' work as expected.
import ./make-test-python.nix {
  name = "avahi";
  meta = with pkgs.lib.maintainers; {
    maintainers = [ eelco ];
  };

  nodes = let
    cfg = { ... }: {
      services.avahi = {
        enable = true;
        nssmdns4 = true;
        publish.addresses = true;
        publish.domain = true;
        publish.enable = true;
        publish.userServices = true;
        publish.workstation = true;
        extraServiceFiles.ssh = "${pkgs.avahi}/etc/avahi/services/ssh.service";
      };
    } // pkgs.lib.optionalAttrs (networkd) {
      networking = {
        useNetworkd = true;
        useDHCP = false;
      };
    };
  in {
    one = cfg;
    two = cfg;
  };

  testScript = ''
    start_all()

    # mDNS.
    one.wait_for_unit("network.target")
    two.wait_for_unit("network.target")

    one.succeed("avahi-resolve-host-name one.local | tee out >&2")
    one.succeed('test "`cut -f1 < out`" = one.local')
    one.succeed("avahi-resolve-host-name two.local | tee out >&2")
    one.succeed('test "`cut -f1 < out`" = two.local')

    two.succeed("avahi-resolve-host-name one.local | tee out >&2")
    two.succeed('test "`cut -f1 < out`" = one.local')
    two.succeed("avahi-resolve-host-name two.local | tee out >&2")
    two.succeed('test "`cut -f1 < out`" = two.local')

    # Basic DNS-SD.
    one.succeed("avahi-browse -r -t _workstation._tcp | tee out >&2")
    one.succeed("test `wc -l < out` -gt 0")
    two.succeed("avahi-browse -r -t _workstation._tcp | tee out >&2")
    two.succeed("test `wc -l < out` -gt 0")

    # More DNS-SD.
    one.execute('avahi-publish -s "This is a test" _test._tcp 123 one=1 >&2 &')
    one.sleep(5)
    two.succeed("avahi-browse -r -t _test._tcp | tee out >&2")
    two.succeed("test `wc -l < out` -gt 0")

    # NSS-mDNS.
    one.succeed("getent hosts one.local >&2")
    one.succeed("getent hosts two.local >&2")
    two.succeed("getent hosts one.local >&2")
    two.succeed("getent hosts two.local >&2")

    # extra service definitions
    one.succeed("avahi-browse -r -t _ssh._tcp | tee out >&2")
    one.succeed("test `wc -l < out` -gt 0")
    two.succeed("avahi-browse -r -t _ssh._tcp | tee out >&2")
    two.succeed("test `wc -l < out` -gt 0")
  '';
} args