hgweb with mod_wsgi's WSGIDaemonProcess running as another user (to skip chmod/chown)

Is it possible to serve hgweb with mod_wsgi's WSGIDaemonProcess running as another开发者_运维问答 user, so that it won't be necessary to do any chmod/chown? E.g. the repositories is under /home/john/repositories, while the WSGIDaemonProcess is configured with user=john

I tried that setup and can browse/clone/pull, but got this error when trying to push:

abort: HTTP Error 500: Permission denied

Just found that the setup works fine if I specify both WSGIApplicationGroup and WSGIProcessGroup. Previously, I only put in the former.