generating message override python code from package

[asmodehn]

Using catkin_pip_package() with generate_message() actually breaks.

What happens (as of catkin_pip 0.2.2) is :

• msg and srv are created in devel/lib/python2.7/dist-packages with an empty __init__.py
• the ros1-pip-template.egg-link file is created in devel/lib/python2.7/site-packages

The link in the egg-link file seems to be checked after the path in PYTHONPATH (likely following default python handling of sys.path), and the package is found with an empty __init__.py, then it only contains msg and srv and not the code...

This is in practice not happening often, as people have taken the habit to split messages into a separate specific package (maybe for similar reasons ?). However we should support this properly, as catkin officially supports it.

[asmodehn]

Note : catkin itself also seems buggy with message generation.

Doing, in a ros pacakge source :

$ mkdir build
$ cmake .. -DCMAKE_INSTALL_PREFIX=./install

detects the messages and services, but the python class are never generated...

This might be related and we need to dig and investigate more...

[asmodehn]

Or it might be because the message generation actually happens when running "make" after that, and not during cmake config step...

[asmodehn]

Note this might be mixed with the fact that a namespace package would make this work (message subpackage in one directory and module code in another_, but a usual python2 package would not...