Make RegisterEventHandler describe its sub-entities

[pbaughman]

• Make the RegisterEventHandler action return a description of its conditional sub-entities
• Also wire up the correct description method for the launch_testing
  stdout ready listener event handler

This is needed so that launch_testing can find a ReadyToTest action that's conditional on seeing some stdout from one of the processes under test

Signed-off-by: Pete Baughman peter.c.baughman@gmail.com

• Closes issue 385

[ivanpauno]

LGTM!
Can you add a test case?

[pbaughman]

@ivanpauno

Can you add a test case?

Yes! let me put a little thought into it first though.

[pbaughman]

@ivanpauno Ok - I didn't do any assertions about the text part of the description - that's not meant to be a thing you use programmatically. I did check that the actions you give to the constructor come out the other side.

[pbaughman]

@ivanpauno poke

[ivanpauno]

CI:

• Linux (unrelated failures)

@ivanpauno poke

I was OoO yesterday.

[pbaughman]

@ivanpauno This kind of looks like an issue with CI:

[ERROR] [launch]: Caught exception in launch (see debug for traceback): package 'demo_nodes_py' found at '/home/jenkins-agent/workspace/ci_linux/ws/install/demo_nodes_py', but libexec directory '/home/jenkins-agent/workspace/ci_linux/ws/install/demo_nodes_py/lib/demo_nodes_py' does not exist

Have you seen something like that before?

[pbaughman]

I get the same errors when I build and test launch_ros master in osrf/ros2:nightly - I think something is broken upstream

[ERROR] [launch]: Caught exception in launch (see debug for traceback): package 'demo_nodes_py' found at '/opt/ros/foxy', but libexec directory '/opt/ros/foxy/lib/demo_nodes_py' does not exist

[pbaughman]

Opened an issue here to try to get this fixed

[ivanpauno]

Thanks for the fix @pbaughman !
The test failures are unrelated, see ros2/build_farmer#266.