anchor.diff:        (isYes "SERIAL_8250")
       ];
     };
  +
  +  mkLog = logfile: tag: let
  +    rotated = map (i: "${logfile}.${toString i}") (range 1 9);
  +    all = concatMapStringsSep " " (f: "\"${f}\"") ([logfile] ++ rotated);
  +    logcmd = "tail -F ${all} 2> /dev/null | logger -t \"${tag}\"";
  +  in "$machine->execute(ru '${logcmd} & disown');";
   
     testVM = vmName: vmScript: let
       cfg = (import ../lib/eval-config.nix {
  
positive.code:           description = "VirtualBox Test Machine Log";
            serviceConfig.StandardInput = "socket";
            serviceConfig.StandardOutput = "syslog";
            serviceConfig.SyslogIdentifier = "vbox-${name}";
            serviceConfig.ExecStart = "${pkgs.coreutils}/bin/cat";
          };
        });
  
negative.code:     ${concatStrings (mapAttrsToList (_: getAttr "testSubs") vboxVMs)}
  
      $machine->waitForX;
  
      ${mkLog "$HOME/.config/VirtualBox/VBoxSVC.log" "HOST-SVC"}
  
      createVM_simple;
  
  