[WIP] Use git info to automatically determine the version number

[thomas-moulard]

This introduces a dependency on setuptools-scm which expends setuptools to automatically determine the package version number based on git information.

This PR should not be merged until ros/rosdistro#22887 is merged as it declares the associated rosdep entry for setuptools-scm.

[thomas-moulard]

Not to be merged before ros/rosdistro#22887

[codecov[bot]]

Codecov Report

Merging #57 into master will not change coverage. The diff coverage is n/a.

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##           master      #57   +/-   ##
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  Coverage   63.56%   63.56%           
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  Files           4        4           
  Lines         269      269           
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  Hits          171      171           
  Misses         98       98

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[nuclearsandwich]

I don't know if the intention is to eventually distribute cross_compile on the ROS buildfarm but source packages are built in a container without build dependencies and so cannot handle packages which have setup.py requirements beyond the basic python and setuptools.

[thomas-moulard]

@nuclearsandwich thanks for the precision - I thought it would respect buildtool_depends, but it seems this is not the case. Anyway to express a dependency at this stage?

[thomas-moulard]

Closing at this seems it won't work. I'll try to get the version number from the package.xml instead. That will be more consistent anyway.

[nuclearsandwich]

Anyway to express a dependency at this stage?

No. Python3 is available to facilitate the dh_python debhelper extension which pulls in distutils and setuptools. The full list is here: https://github.com/ros-infrastructure/ros_buildfarm/blob/b78c453bb1c8a4829ebc26350d3671fcbdedf1c4/ros_buildfarm/templates/release/sourcedeb_task.Dockerfile.em#L39-L51

[thomas-moulard]

@nuclearsandwich Thanks for your help, you're everywhere :)

[nuclearsandwich]

you're everywhere :)

Everywhere and nowhere.