I'm trying to create an env-hook for Catkin, and the common approach seems to be to use EmPY templates of shell scripts. I'm basically following the example of [core/roslib/env-hooks](https://github.com/ros/ros/blob/bf3e45955e5c8aac2ab276d6b956b21bc13ddccc/core/roslib/env-hooks/10.ros.sh.em).
The EmPY template seems to provide certain variables like `@(ROS_DISTRO)` or `@(CATKIN_DEVEL_PREFIX)`. Where can I find an overview over which variables are defined withing a Catkin EmPY template and how exactly are they defined?
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