This is a wrapper for git-shell, and the parameters are passed on to that program. Used in a ssh
authorized_keys file for an ikiwiki-hosting site user, it adds several safety features to incoming
commits. These include the ability to park a repo, preventing changes, and limiting access to only a
site's source.git repository and no other repositories.
In addition to running git-shell commands, a very few other commands can be run by the remote user.
"logview" will tail their site's apache access.log, and "logdump" will dump out out.