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Re: Does “${python3:Depends}” reliably generate correct dependencies?

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From Scott Kitterman <debian@kitterman.com>
Newsgroups linux.debian.maint.python
Subject Re: Does “${python3:Depends}” reliably generate correct dependencies?
Date Sun, 25 Oct 2015 10:10:01 +0100
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On October 25, 2015 1:17:17 AM EDT, Ben Finney <ben+debian@benfinney.id.au> wrote:
>Howdy all,
>
>If we set “Depends: ${python3:Depends}” in the binary package, and use
>‘dh_python3’, is that all that is needed to ensure the correct
>dependencies on Python 3 versions?
>
>Recently I received this bug report (Bug#802889):
>
>    please don't depend on all python3 versions, forcing the
>    installation of all python versions shouldn't be enforced for a
>    module.
>
>    $ apt-cache show python3-coverage | grep Depends
>   Depends: python3-pkg-resources, python3 (<< 3.6), python3 (>= 3.4~),
>    python3.4, python3.5, libc6 (>= 2.4)
>
>    <URL:https://bugs.debian.org/802889>
>
>So far as I can tell, these dependencies are generated because
>“Depends: […] ${python3:Depends}” is in that “Package” definition.
>
>On a Debian Sid system today, building a package for Python 3, along
>with its extension modules, means building it for all supported Python
>3
>versions. Are the above dependencies wrong for that?
>
>If the dependencies are incorrect, what should be used in the Depends
>field instead of “${python3:Depends}”?
>
>If the dependencies are correct, exactly what should I say in
>explanation to the reporter of Bug#802889?

Usually you only get the dependency on the specific python3 interpreters if there's a script with a shebang using that version.  I'd check for that.

It could either be in the original source or due to dh_python3 doing something interesting in shebang rewriting (IIRC there's a known issue that P1otr is working on).

Scott K

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Thread

Does “${python3:Depends}” reliably  generate correct dependencies? Ben Finney <ben+debian@benfinney.id.au> - 2015-10-25 06:20 +0100
  Re: Does “${python3:Depends}”  reliably generate correct dependencies? Brian May <brian@linuxpenguins.xyz> - 2015-10-25 08:00 +0100
  Re: Does “${python3:Depends}” reliably generate correct dependencies? Scott Kitterman <debian@kitterman.com> - 2015-10-25 10:10 +0100
    Re: Does “${python3:Depends}” reliably generate  correct dependencies? Dmitry Shachnev <mitya57@debian.org> - 2015-10-25 10:20 +0100
    Re: Does “${python3:Depends}”  reliably generate correct dependencies? Piotr Ożarowski <piotr@debian.org> - 2015-10-25 10:40 +0100
  Re: Does “${python3:Depends}”  reliably generate correct dependencies? Piotr Ożarowski <piotr@debian.org> - 2015-10-25 10:30 +0100

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