Python2 removal for focal ...

[Matthias Klose]

An update ... starting today, python-defaults in -proposed doesn't build the
binary packages

  libpython-dbg libpython-dev libpython-stdlib
  python python-dbg python-dev python-doc python-minimal

anymore, because we don't ship those packages anymore in focal.  Python2 usage
should be removed, or python2 should be used explicitly, so change any of the
dependencies above to

  libpython2-dbg libpython2-dev libpython2-stdlib
  python2 python2-dbg python2-dev python2-doc python2-minimal

and change she shabang to python2 if you need to keep the Python2 packages.

The python command will be reintroduced before release in a new package
python-pointing-to-python2.

Matthias


On 11.11.19 01:24, Matthias Klose wrote:
> Enabling the syncs form unstable brang all the Python2 removal goodness to
> focal, however sometimes a little bit too much.  Ubuntu has it's own debt in now
> ownerless packages which still depend on some Python2 module which is now
> removed in Debian.
> 
> When looking at update_excuses.html, you will likely see many "valid candiates"
> for migration, however when looking at update_output.txt, you'll see which
> packages prevent migration to the release pocket.
> 
> Please find attached a script to track the current diff between the Python2
> removal in unstable and focal, but keep in mind, that this script doesn't show
> the packages anymore, which are stuck in the proposed pocket.
> 
> What to do for the Python2 removal?
> 
>  - Convert the packages to Python3, this is the preferred option,
>    although if it's not done by now, how likely is the conversion?
> 
>  - Remove the package. Please file bug reports, documenting the
>    check for reverse-dependencies.
> 
>  - If the package still needs to be kept in the archive, go the
>    painful way, and maybe re-introduce all the just removed
>    Python2 module packages.  If this is a source package
>    building both Python2 and Python3 modules, your are then
>    committed to merge this continuously. Also keep in mind that
>    upstreams are already dropping support for Python2. Then
>    better build the Python2 modules from a separate source.
> 
>    If you decide to keep Python2 based packages, make sure that
>    the package doesn't reference any of the python, python-dev,
>    python-dbg, python-doc packages, and doesn't use the unversioned
>    python binary.  These should use python2, python2-dev,
>    python2-dbg, python2-doc instead and use the python2 binary.
> 
> There are about 3300 bugs filed in Debian, 1500 are already closed, plus the 350
> packages only available in focal.  Please keep the focus on the packages which
> are not migrating, and on reducing the number of Ubuntu only packages.
> 
> And please don't shoot the messenger, I hope I didn't ever upload an Ubuntu-only
> Python2 package myself ;)
> 
> Matthias
> 
> https://people.canonical.com/~ubuntu-archive/transitions/html/python2-rm.html
> https://wiki.debian.org/Python/2Removal
>