I'm setting up a pfSense CVS mirror right now, and I'm using nginx server for the CVS Web interface. nginx server is kindda weird-- everything has to done manually, even for setting up a Perl process that will bind to a Unix socket in order to run Perl scripts.

Here's the URL for my mirror:
http://www.simoncpu.com/freedom/pfSense/CVS/cvsweb.cgi

Please note that not everything will work, as this is still highly experimental.