Catkin and overlays

edit

Just to recap the workspace_overlaying tutorial, I have two catkin based workspaces catkin_A and catkin_B. I want to configure them so that the catkin_A overlays ROS standard packages and catkin_B overlays catkin_A. Assuming that both have been properly initialised and filled with packages as follows

$ source /opt/ros/hydro/setup.bash
$ mkdir -p ~/catkin_X/src
$ cd ~/catkin_X/src; catkin_init_workspace

So to set up the overlay structure i do

$ source /opt/ros/hydro/setup.bash
$ cd ~/catkin_A
$ catkin_make

and

$ source ~/catkin_A/devel/setup.bash
$ cd ~/catkin_B
$ catkin_make

In order to use the catkin_B workspace I have to source $ source ~/catkin_B/devel/setup.bash. The $ source ~/catkin_A/devel/setup.bash is the crucial part as the tutorial says the question is do I have to do it every time I call catkin_make in the catkin_B to clear the catkin_B from environment?

How about catkin_make in catkin_A if I have previously used catkin_B do I have to `source /opt/ros/hydro/setup.bash'?

I'm asking this question as the overlay setup gets broken from time to time, rosrun starts looking in /opt/ros/hydro for nodes that should be overlaid in catkin_A.