Best practices for maintaining a subversion mirror?

Hi,

I just got myself a new server, and as I'm the major Git-using person at my work, I'd like to set a mirror of our Subversion repository up to hopefully convert a few more people. At the moment, I've done git svn clone http://svn..., and then git clone --bare to make a --bare version of this clone.

Now that I have this mirror, I have this entry in my crontab to update it hourly:

0 * * * * cd /.git && /usr/bin/git --git-dir=. svn fetch && /usr/bin/git update-ref refs/heads/master refs/remotes/git-svn

This seems to be working nicely as a readonly interface, but when I clone this repository (git clone git://foo/repo.git) - served via git-daemon - I can't seem to get svn rebase to work on it, which means I can't dcommit my changes back to Subversion.

Am I doing things generally the right way, or am I doing it completely wrong? :-) Any tips appreciated!

- Oliver Charles