A way to to evaluate conditions across launch files at runtime?

[ddengster]

Feature request

A way to use simple python to evaluate conditions between launch files at runtime.

Feature description

Say I have a launch file upstream.launch.py that invokes IncludeLaunchDescription with downstream.launch.py.

downstream.launch.py has something like a LaunchArgument("moveit_controller_manager") in its LaunchDescription

Then I'd like to be able to evaluate something in downstream.launch.py similar to:
launch.substitutions.LaunchConfiguration("moveit_controller_manager") is 'coffeebot'
Based on this condition I'd be able to set additional variables or perform some conditional logic for my launch file.

Implementation considerations

It doesnt seem to be in the design from what I've read.

[hidmic]

Check launch.substitutions.PythonExpression.

@ddengster I encourage you to ask this kind of questions over in answers.ros.org, where the community at large can help you and/or benefit from this exchange. I'll close this issue now.