Generate license using ament_copyright

[JafarAbdi]

To unblock the galactic & rolling releases

[v4hn]

Accept, up to two inline comments.

[v4hn]

It's an old discussion, with a relatively new touch in ROS2. Do we really want copyright texts in all launch files?
This clutters otherwise mostly trivial files (granted, the ROS2 files do not look that trivial at the moment...)

I would vote to leave them out there unless it's impossible to silence some automatic pedantic checker.

[JafarAbdi]

Unfortunately, I'm not aware of a way to exclude certain files from ament_copyright linter, removing the copyright from this file will cause the linter to report failure

[henningkayser]

ament_copyright has an --exclude option. Can't we use that?

[JafarAbdi]

But how would we use it with ament_lint_auto_find_test_dependencies .? we either need to remove it and explicitly list all linters' cmake test ourselves (I tried this and it will complicate the BUILD_TESTING section) or disable it and create a pre-commit hook to handle having exclude argument

[v4hn]

But how would we use it with ament_lint_auto_find_test_dependencies .?

If the macro does not provide a way for that already, it might be worthwhile to add a cmake variable to the command (AMENT_COPYRIGHT_OPTIONS) upstream to set the behavior in another line before the call?

[JafarAbdi]

it might be worthwhile to add a cmake variable to the command (AMENT_COPYRIGHT_OPTIONS)

I like this idea, added to my todo list