Bug encountered while comitting

Hello list,

I don't know if this is the right place to report a bug, but I'll just try and see what comes back.

I am trying to build a Wiki [1] using PHP, a hacked version of Markdown, and git for content tracking. I use the git core plumbing to do the history work.

The PHP script created directories under .git/objects which were only writable by www-data. There were other directories which were owned by user mk and group www-data, and they were group writable.

So, I had write access to only a part of the .git directory.

When I tried to commit, I got a message saying "Unable to write sha1 filename".

The result was, that only part of the commit was recorded and that I experienced repository corruption. refs/heads/master pointed to a non-existant object.

The expected behavior would have been an error message telling me I had insufficient write privileges and surely no repository corruption.

Thanks, Matthias

[1]: http://spinlock.ch/cgi-bin/gitweb.pl?p=swisdk2/bugs.git;a=tree (See Wiki_ctrl.php for source)