I really thought this should be easy, but it turns out that there are a lot of pitfalls. So for any other poor souls who are not fluent in python (and for my own reference) here it goes.
As you know, trac has some requirements. Namely setuptools and genshii. There are a few packages to download for Windows here. I didn't know which version of python came with subversion edge, so I checked. There is a folder named csvn/python25. So it seems to be python 2.5. But wait - there is a python27.dll in there. and some other files indicating python 2.7. So which is it?
D:\csvn\Python25>python.exe --versionAlright, that settles it. But why did Collabnet not rename the folder..?
So I downloaded the setuptools package for python 2.7 and win32. The installer failed to run, it sais it couldn't find any python 2.7 installation.
Apparently a regular python installer will create some registry entries so that the system recognizes the python installation. Collabnet subversion edge doesn't do this anymore due some complaints.
So I had to go in there and manually create the relevant entries. They were already present from the old python 2.5 installation, which I wanted to get rid of anyway. So I changed the version to 2.7 and updated the paths to point to D:\csvn\python25. This let me install setuptools, genshii and finally trac too.
That part was straight-forward. Like with subversion, I just copied the relevant parts of my VisualSVN server's apache config and pasted it to the main httpd.conf file. Here is the relevant snippet:
<Location /trac>All relevant modules are already loaded, so that's it.
PythonOption TracEnvParentDir D:\Trac
PythonOption TracUriRoot /trac
require group DOMAIN\Trac-Users