Issue Tracking with Bugzilla
This plugin allows you to link to tickets in Bugzilla from within Trac. If you have Bugzilla deployed as your issue tracking system and are unable to move away from it, this plugin should enable you to use Trac and have the #123 links automatically link back to your Bugzilla pages rather than Trac's pages.
See also: t:TracImport
If you have any issues, create a new ticket.
Download the zipped source from here.
Just copy the bugzilla.py file into the 'plugins' sub-folder of your Trac environment.
Make sure you disable Trac's native tickets before the ticket numbers will link to your Bugzilla installation correctly. To do this just add trac.ticket.* = disabled to the components section of your trac.ini file. If there isn't a [components] section, then create one.
Out-of-the-box bugzilla.py will try to link to a Bugzilla installation running on http://bugzilla. This probably isn't what you want and to have it point at your installation, add a new section to the trac.ini file named [bugzilla]. The Bugzilla plugin understands only one parameter, which is 'bugzilla_url'. Have this point to where your Bugzilla installation really resides (trailing slash is optional).
The end of your trac.ini file may now look like:
[components] trac.ticket.* = disabled [bugzilla] bugzilla_url = http://bugzilla