ros/rospkg — pull request #38 by stonier (2013-06-03 23:18:32+00:00)
Title: Location of roscore.xml did change...

This is the location for groovy (hydro the same?).

A better option may be to use [roslib.packages.find_resource](https://github.com/ros/ros/blob/groovy-devel/core/roslib/src/roslib/packages.py), but as remarked, with catkin, this api is not certain (though it is not here either).