Graham.Dumpleton at gmail
Nov 14, 2007, 1:49 PM
Post #2 of 3
(197 views)
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Re: two different tracs, but one apache only
[In reply to]
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On Nov 15, 1:29 am, Rainer Sokoll <R.Sok...@intershop.de> wrote:
> Hi,
>
> is $SUBJECT possible?
> Background: I need to check whether all my plugins will work with the
> current .11 trunk.
> Right now, I'm on 0.11dev-r6137, but AFAIK, with r6138, the API has
> been changed, and some plugins may stop working correctly.
> If I use for example
>
> <Location /tractest>
> [...]
> PythonPath "sys.path + ['/path/to/my/brandnew/trac']"
> [...]
> </Location>
>
> my old trac is still in sys.path, correct? If so, which one will be
> used?
> Is there any other way beside using a second instance of apache and a
> second python installation?
You can't do it with mod_python.
The primary reason is that if using Trac in conjunction with
Subversion, then to be safe and avoid potential problems with Python
bindings for Subversion, you must force mod_python to run Trac in the
main interpreter. In doing this though it will not be possible to be
using two different versions of Trac for different instances.
If only wishing to test stuff, you could always just run Trac through
CGI. It will be slow but allow you to easily run it with different
versions of the software you want to test.
Another alternative for Apache is to use mod_wsgi (http://
www.modwsgi.org) instead. Using its daemon process mode it is possible
to farm off distinct Trac instances to different daemon processes.
Because they are in different processes you can safely run them in the
main interpreter but also have them use different versions of software
through appropriate setup of sys.path. To be absolutely safe and avoid
problems if Trac is still installed in global site-packages, then
mod_wsgi can be used in conjunction with Python virtual environments
such as virtualenv.py (http://pypi.python.org/pypi/virtualenv).
So perhaps just use CGI, but if interested in how to do it in
mod_wsgi, can point out relevant documentation and step you through
it.
Graham
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