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  • Re: Bug#1025164: lintian: missing-prerequisite-for-pyproject-backend ta

    From Stuart Prescott@21:1/5 to Scott Kitterman on Thu Dec 1 08:00:01 2022
    Hi Scott

    On 01/12/2022 15:16, Scott Kitterman wrote:
    On Wednesday, November 30, 2022 10:38:30 PM EST Stuart Prescott wrote:
    Hi Scott,

    On 01/12/2022 02:16, Scott Kitterman wrote:
    Package: lintian
    Version: 2.115.3
    Severity: normal
    X-Debbugs-Cc: debian-python@lists.debian.org

    The missing-prerequisite-for-pyproject-backend check appears to only
    look for the prerequisite packages in Build-Depends, but since they
    aren't needed for clean, they could be in Build-Depends-Indep, leading
    to false positives.

    Scott K

    I contemplated filing a similar the other day but in writing it up, I
    realised that lintian was correct. Policy requires that the 'clean'
    target be functional with only the Build-Depends (and Build-Conflicts)
    satisfied, and pybuild + the build-backend dependencies are involved in
    the cleaning step.

    Not always. At least with the package I ran into this on, clean works fine without them.

    Yes indeed...

    - the most obvious case where that works is where 'clean' is explicit in d/rules

    - it would also be possible for it to work in situations where dh-python
    is (redundantly?) listed in B-D (not B-D-I), since the pyproject
    plugin's 'clean' operation has no dependency on `build`, `installer`,
    and the backend.

    However, this for this second case:

    - it might result in pybuild picking a different plugin through lack of dependencies like `tomli`. That might just work... but also feels
    slightly terrifying.

    - there's not _currently_ any backend-specific cleaning code, but
    perhaps there should be, which would then need the deps to be in B-D?
    (Is that in the spec somewhere?)

    I guess the main thing to be careful of in any rewording of this
    explanation is that for the most common case of using "%:\n\tdh
    --buildsystem pybuild", dh-python (or pybuild-plugin-pyproject) is
    needed in B-D not B-D-I to be policy-compliant.

    cheers
    Stuart




    --
    Stuart Prescott http://www.nanonanonano.net/ stuart@nanonanonano.net Debian Developer http://www.debian.org/ stuart@debian.org
    GPG fingerprint 90E2 D2C1 AD14 6A1B 7EBB 891D BBC1 7EBB 1396 F2F7

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