anchor.diff:    ];
   
     controllerQemuArgs = concatStringsSep " " (maybeKvm64 ++ [
  +    "-pidfile $CTRLVM_PIDFILE"
       "-nographic"
       "-no-reboot"
       "-virtfs local,path=/nix/store,security_model=none,mount_tag=store"
  
positive.code:       echo -n .
        ${coreutils}/bin/sleep 1
      done
      echo " success."
  
      ${openssh}/bin/ssh \
  
negative.code:       # Print a dot every 10 seconds only to shorten line length.
        ${coreutils}/bin/sleep 10
      done
      ${coreutils}/bin/touch /xchg/waiting_done
      echo " success."
      # Loop forever, because this VM is going to be killed.
      ${loopForever}
  