First create a handler for Trac:
<Location /trac>
SetHandler mod_python
PythonHandler trac.web.modpython_frontend
PythonInterpreter main
PythonOption TracEnv /path/to/env
PythonOption TracUriRoot /trac
SetEnv PYTHON_EGG_CACHE /tmp
</Location>
PythonInterpreter needs to be set to the same string in all VirtualHosts using Trac, though the actual value is unimportant. PythonOption TracUriRoot needs to be set to the same path as in the Location.
For a multiple environment configuration you can use PythonOption TracEnvParentDir.
See Authentication on Apache to setup authentication.
If Trac, or other modules, are not installed in the standard path, you can use the PythonPath option to add additional folders:
PythonPath "['/new/path'] + sys.path"
See also
A full example of a mod_python and mod_dav_svn configuration:
<VirtualHost *:80>
ServerName example.com
ServerAlias www.example.com
ServerAdmin webmaster@example.com
# Note: This folder should exist, but will generally be empty
DocumentRoot /srv/example.com/htdocs
<Directory /srv/example.com/htdocs>
Order allow,deny
Allow from all
</Directory>
# Host the main Trac instance at /
<Location />
SetHandler mod_python
PythonHandler trac.web.modpython_frontend
PythonInterpreter main
PythonOption TracEnv /srv/example.com/tracs/main
PythonOption TracUriRoot /
SetEnv PYTHON_EGG_CACHE /tmp
</Location>
# Host all others at /projects/$PROJECT
<Location /projects>
PythonOption TracEnv ""
PythonOption TracEnvParentDir /srv/example.com/tracs
</Location>
# Handle logins on both /login and /projects/$PROJECT/login
<LocationMatch ^(/projects/[^/]+)?/login>
AuthType Basic
AuthName "example.com Login"
AuthUserFile /srv/example.com/htpassd
Require valid-user
</LocationMatch>
# Host subversion for all projects at /svn
<Location /svn>
DAV svn
SVNParentPath /srv/example.com/repos
SVNListParentPath on
AuthType Basic
AuthName "example.com Login"
AuthUserFile /srv/example.com/htpassd
# Allow anonymous checkout
<LimitExcept GET PROPFIND OPTIONS REPORT>
Require valid-user
</LimitExcept>
</Location>
</VirtualHost>
In general, if you get server error pages, you can either check the Apache error log, or enable the PythonDebug option:
<Location /trac>
...
PythonDebug on
</Location>
This problem will most certainly hit you on Unix when using Python 2.4. In Python 2.4, some version of Expat (an XML parser library written in C) is used, and if Apache is using another version, this results in segmentation faults. As Trac 0.11 is using Genshi, which will indirectly use Expat, that problem can now hit you even if everything was working fine before with Trac 0.10.
See Graham Dumpleton’s detailed explanation and workarounds for the issue.
If you’re experiencing problems submitting some of the forms in Trac (a common problem is that you get redirected to the start page after submission), check whether your DocumentRoot contains a folder or file with the same path that you mapped the mod_python handler to. For some reason, mod_python gets confused when it is mapped to a location that also matches a static resource.
If the <Location /> directive is used, setting the DocumentRoot may result in a ‘‘403 (Forbidden)’’ error. Either remove the DocumentRoot directive, or make sure that accessing the directory it points is allowed (in a corresponding <Directory> block).
Using <Location /> together with SetHandler resulted in having everything handled by mod_python, which leads to not being able download any CSS or images/icons. I used <Location /trac> SetHandler None </Location> to circumvent the problem, though I do not know if this is the most elegant solution.
Although it may seem trivial to rewrite the above configuration as a directory in your document root with a .htaccess file, this does not work. Apache will append a “/” to any Trac URLs, which interferes with its correct operation.
It may be possible to work around this with mod_rewrite, but I failed to get this working. In all, it is more hassle than it is worth. Stick to the provided instructions. :)
If you run trac with mod_python < 3.2 on Windows, uploading attachments will not work. This problem is resolved in mod_python 3.1.4 or later, so please upgrade mod_python to fix this.
When using mod_python on OS X you will not be able to restart Apache using apachectl restart. This is apparently fixed in mod_python 3.2, but there’s also a patch available for earlier versions here.
If Trac reports something like: ‘’Cannot get shared lock on db.lock’’ The security context on the repository may need to be set:
chcon -R -h -t httpd_sys_content_t PATH_TO_REPOSITORY
See also
Pay attention to the version of the installed mod_python and sqlite packages. Ports have both the new and old ones, but earlier versions of pysqlite and mod_python won’t integrate as the former requires threaded support in python, and the latter requires a threadless install.
If you compiled and installed apache2, apache wouldn’t support threads (cause it doesn’t work very well on FreeBSD). You could force thread support when running ./configure for apache, using –enable-threads, but this isn’t recommended. The best option seems to be adding to /usr/local/apache2/bin/ennvars:
export LD_PRELOAD=/usr/lib/libc_r.so
If you get the following Trac Error Unsupported version control system "svn" only under mod_python, though it works well on the command-line and even with TracStandalone, chances are that you forgot to add the path to the Python bindings with the PythonPath directive. (The better way is to add a link to the bindings in the Python site-packages directory, or create a .pth file in that directory.)
If this is not the case, it’s possible that you’re using Subversion libraries that are binary incompatible with the apache ones (an incompatibility of the apr libraries is usually the cause). In that case, you also won’t be able to use the svn modules for Apache (mod_dav_svn).
You may encounter segfaults (reported on debian etch) if php5-mhash module is installed. Try to remove it to see if this solves the problem. See debian bug report 411487.
Some people also have troubles when using php5 compiled with its own 3rd party libraries instead of system libraries. Check here.