[ros-release] Ease comparing versions of packages between ROS distros

[Jonathan Bohren]

Cool stuff! Thanks, Dirk!

-j


On Thu, Mar 6, 2014 at 6:11 PM, Dirk Thomas <dthomas at osrfoundation.org>wrote:

> For maintainers a common set of questions regarding multiple ROS
> distributions are:
>
> * after releasing patch releases into Hydro, did I already released the
> same version into Groovy?
> * which versions of a repo are released in the current ROS distros?
>
> To answer those faster then looking up the relevant information manually I
> generated some additional "compare version" pages.
> They can be found in the same location as the Debian package status pages:
> http://www.ros.org/debbuild/
>
> Currently the following variants exist:
>
> * Groovy vs. Hydro: http://www.ros.org/debbuild/compare_groovy_hydro.html
> * Hydro vs. Indigo: http://www.ros.org/debbuild/compare_hydro_indigo.html
> * all current distros (G, H and I): http://www.ros.org/debbuild/
> compare_groovy_hydro_indigo.html
>
> Some predefined filters exist which allow to narrow down the list of repos
> based on the following criteria:
>
> * different patch version:
>   The packages from a repo in two ROS distros have the same major and
> minor version but a different patch version.
>   Usually that implies that you should update the distro which lacks a bit
> behind.
>   Temporary that might be the case when you first release a new version
> into one distro and after some soak time release it into the other distros.
>
> * downgrade:
>   The packages from a repo in a newer ROS distro have a lower major or
> minor version number.
>   The maintainer should reconsider the versioning of the repo and
> rerelease the packages from the repo with proper version numbers.
>
> * same version from different branches:
>   The packages from a repo have the same major and minor version
> (potentially a different patch version) but are released from different
> branches.
>   That usually indicates a problem since it is likely that there could be
> or will be two packages with the same version but different code (since
> both branches might need to perform patch releases over time).
>   Commonly the maintainer would increase the minor version when branching
> for the next ROS distro to avoid this kind of situation.
>
> I hope you will find these pages useful when maintaining ROS packages.
>
> Cheers,
> - Dirk
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> ros-release at code.ros.org
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>



-- 
Jonathan Bohren
Laboratory for Computational Sensing and Robotics
http://dscl.lcsr.jhu.edu/People/JonathanBohren
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