anchor.diff:                assert "somehost.test" in machine.succeed("${getent'} hosts 2001:db8::1")
                 assert "somehost.test" in machine.succeed("${getent'} hosts 192.0.2.1")
   
  +
         # Test host resolution via nss modules works
         # We rely on nss-myhostname in this case, which resolves *.localhost and
         # _gateway.
  
positive.code:       start_all()
        machine.wait_for_unit("default.target")
  
        # Test all tests with glibc-nscd.
        test_dynamic_user()
        test_host_lookups()
  
negative.code:       2001:db8::1 somehost.test
        192.0.2.1 somehost.test
      '';
  
      systemd.services.sockdump = {
        wantedBy = [ "multi-user.target" ];
        path = [
          # necessary for bcc to unpack kernel headers and invoke modprobe
          pkgs.gnutar
          pkgs.xz.bin
          pkgs.kmod
        ];
        environment.PYTHONUNBUFFERED = "1";
  
        serviceConfig = {
          ExecStart = "${pkgs.sockdump}/bin/sockdump /var/run/nscd/socket";
          Restart = "on-failure";
          RestartSec = "1";
          Type = "simple";
        };
      };
  
      specialisation = {
        withUnscd.configuration = { ... }: {
  