[catkin] Examples for Environment Hooks that work in both devel- and install-space, referencing directories? (empy?)

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In .em templates for environment hooks only the following variables are available from the CMake context: https://github.com/ros/catkin/blob/in...

If you need additional custom variables in your template you have to use .in files (which are expanded by the CMake configure_file function which will pass all CMake variable to the template).

Independent of the template type you can either use one template which conditionally deals with devel and install space ( https://github.com/ros/ros/blob/hydro... ) or you can use separate templates for both. In that case you distinguish the template by inserting develspace / installspace between the filename and the extension ( http://docs.ros.org/api/catkin/html/d... ).