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Reaching team consensus on usage of py3versions -r and X-Python3-Version in Lintian

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Hey folks,

I'm following up on bug #1001677 [1] on the DPT's list to try to reach
consensus, as I think the Lintian tags that were created to fix this bug
are not recommending the proper thing.

As a TL;DR for those of you who don't want to read the whole BTS thread,
jdg saw that a bunch of packages were using `py3versions -r` in
autopkgtests, and this fails when there's no X-Python3-Version variable
in d/control.

The fix that Lintian now proposes for packages that use `py3versions -r`
in autopkgtests is to set X-Python3-Version.

I think the proper fix would be to ask people to move away from
`py3versions -r` if there is no X-Python3-Version, and use`py3versions
-s` instead.

As such, I think we should ask the Lintian maintainers to:

1. Change the desc for tag declare-requested-python-versions-for-test to

The specified test attempts to query the Python versions
<em>requested</em> by your sources with the command <code>py3versions
--requested</code> but your sources do not actually declare those
versions with the field <code>X-Python3-Version</code>.
.
Please query all <em>supported</em> Python versions with the command
<code>py3versions --supported</code> in your test instead.

2. Change the desc for tag query-requested-python-versions-in-test to

The specified test queries all <em>supported</em> Python versions with
the command <code>py3versions --supported</code> but your sources
request a specific set of versions via the field
<code>X-Python3-Version</code>.
.
Please delete the field <code>X-Python3-Version</code>, as it is not needed.


These changes would push maintainers to use `py3versions -s`, but
wouldn't ask people using `py3versions -r` and X-Python3-Version to make
any changes.

AFAIU, the only valid use of X-Python3-Version would be a package that
fails to build on an older but currently supported version of Python
(let's say 3.9) but builds on the newer version (say 3.10). I think such
use cases are pretty rare though.

Cheers,

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1001677

-- 
  ⢀⣴⠾⠻⢶⣦⠀
  ⣾⠁⢠⠒⠀⣿⡁  Louis-Philippe Véronneau
  ⢿⡄⠘⠷⠚⠋   pollo@debian.org / veronneau.org
  ⠈⠳⣄

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Reaching team consensus on usage of py3versions -r and  X-Python3-Version in Lintian Louis-Philippe Véronneau <pollo@debian.org> - 2022-01-17 18:50 +0100
  Re: Reaching team consensus on usage of py3versions -r and  X-Python3-Version in Lintian Sandro Tosi <morph@debian.org> - 2022-01-17 21:00 +0100
  Re: Reaching team consensus on usage of py3versions -r and  X-Python3-Version in Lintian Neil Williams <codehelp@debian.org> - 2022-01-18 09:20 +0100
    Re: Reaching team consensus on usage of py3versions -r and X-Python3-Version in Lintian Scott Kitterman <debian@kitterman.com> - 2022-01-18 14:10 +0100
  Re: Reaching team consensus on usage of py3versions -r and  X-Python3-Version in Lintian Thomas Goirand <zigo@debian.org> - 2022-01-18 15:40 +0100
    Re: Reaching team consensus on usage of py3versions -r and  X-Python3-Version in Lintian Julian Gilbey <jdg@debian.org> - 2022-01-19 20:30 +0100

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