hang on  thats rubbish  ignore that idea  i kinda think if we want conf image cache subdirectory name to mean the same for vmware and libvirt  if possible  if we added a conf vmware make cache folder unique that controlled if you add the my ip to the conf image cache subdirectory name  it would be much simpler  admins that want to share the folder  then just set conf vmware make cache folder unique false  then they configure the cache directly  just like libvirt folks  by configuring conf image cache subdirectory name