Since version 0.9, Trac supports plugins that extend the built-in functionality. The plugin functionality is based on the component architecture.
To use plugins in Trac, you need to have setuptools, version 0.5a13 installed.
To install setuptools, download the bootstrap module ez_setup.py and execute it as follows:
$ python ez_setup.py setuptools==0.5a13
Installing a Trac Plugin
Plugins are packaged as Python eggs. That means they are ZIP archives with the file extension .egg. If you have downloaded a source distribution of a plugin, you can run:
$ setup.py bdist_egg
to build the .egg file.
Once you have the plugin archive, you need to copy it into the plugins directory of the project environment. Also, make sure that the web server has sufficient permissions to read the plugin egg.
Setting up the Plugin Cache
Some plugins will need to be extracted by the Python eggs runtime (pkg_resources), so that their contents are actual files on the file system. The directory in which they are extracted defaults to the home directory of the current user, which may or may not be a problem. You can however override the default location using the PYTHON_EGG_CACHE environment variable.
To do this from the Apache configuration, use the SetEnv directive as follows:
SetEnv PYTHON_EGG_CACHE /path/to/dir