Bug#1046775: scikit-learn: Fails to build source after successful build

[Lucas Nussbaum]

Source: scikit-learn
Version: 1.2.1+dfsg-1
Severity: minor
Tags: trixie sid ftbfs
User: lucas at debian.org
Usertags: ftbfs-sab-20230813 ftbfs-source-after-build
User: debian-qa at lists.debian.org
Usertags: qa-doublebuild

Hi,

This package fails to build a source package after a successful build
(dpkg-buildpackage ; dpkg-buildpackage -S).

This is probably a clear violation of Debian Policy section 4.9 (clean target),
but this is filed as severity:minor for now, because a discussion on
debian-devel showed that we might want to revisit the requirement of a working
'clean' target.

More information about this class of issues, included common problems and
solutions, is available at
https://wiki.debian.org/qa.debian.org/FTBFS/SourceAfterBuild

Relevant part of the build log:
> cd /<<PKGBUILDDIR>> && runuser -u user42 -- dpkg-buildpackage --sanitize-env -us -uc -rfakeroot -S
> ------------------------------------------------------------------------------------------------------------------------------------
> 
> dpkg-buildpackage: info: source package scikit-learn
> dpkg-buildpackage: info: source version 1.2.1+dfsg-1
> dpkg-buildpackage: info: source distribution unstable
> dpkg-buildpackage: info: source changed by Andreas Tille <tille at debian.org>
>  dpkg-source --before-build .
>  debian/rules clean
> dh clean --with python3 --buildsystem pybuild
>    dh_auto_clean -O--buildsystem=pybuild
> I: pybuild base:275: python3.11 setup.py clean 
> Partial import of sklearn during the build process.
> running clean
>    dh_autoreconf_clean -O--buildsystem=pybuild
>    debian/rules override_dh_clean
> make[1]: Entering directory '/<<PKGBUILDDIR>>'
> dh_clean
> rm -rf .pytest_cache build scikit_learn.egg-info tmp
> mv PKG-INFO-BAK PKG-INFO
> mv: cannot stat 'PKG-INFO-BAK': No such file or directory
> make[1]: [debian/rules:135: override_dh_clean] Error 1 (ignored)
> rm -f debian/build-stamp-*
> for i in $(find -name '*.pyx'); do \
> 	rm -f ${i%.*}.c ${i%.*}.cpp; \
> done
> for i in $(find -name '*.pyx.in'); do \
> 	rm -f ${i%.*}; \
> done
> /usr/bin/make -C doc clean
> make[2]: Entering directory '/<<PKGBUILDDIR>>/doc'
> rm -rf _build/*
> rm -rf auto_examples/
> rm -rf generated/*
> rm -rf modules/generated/
> make[2]: Leaving directory '/<<PKGBUILDDIR>>/doc'
> make[1]: Leaving directory '/<<PKGBUILDDIR>>'
>  dpkg-source -b .
> dpkg-source: info: using source format '3.0 (quilt)'
> dpkg-source: info: building scikit-learn using existing ./scikit-learn_1.2.1+dfsg.orig.tar.xz
> dpkg-source: info: using patch list from debian/patches/series
> dpkg-source: error: cannot represent change to doc/themes/scikit-learn-modern/static/css/vendor/bootstrap.min.css:
> dpkg-source: error:   new version is symlink to /usr/share/javascript/bootstrap4/css/bootstrap.min.css
> dpkg-source: error:   old version is nonexistent
> dpkg-source: error: cannot represent change to doc/themes/scikit-learn-modern/static/js/vendor/bootstrap.min.js:
> dpkg-source: error:   new version is symlink to /usr/share/javascript/bootstrap4/js/bootstrap.min.js
> dpkg-source: error:   old version is nonexistent
> dpkg-source: warning: ignoring deletion of directory scikit_learn.egg-info
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/dependency_links.txt, use --include-removal to override
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/not-zip-safe, use --include-removal to override
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/top_level.txt, use --include-removal to override
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/SOURCES.txt, use --include-removal to override
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/PKG-INFO, use --include-removal to override
> dpkg-source: warning: ignoring deletion of file scikit_learn.egg-info/requires.txt, use --include-removal to override
> dpkg-source: error: unrepresentable changes to source
> dpkg-buildpackage: error: dpkg-source -b . subprocess returned exit status 1
> 
> E: Command 'cd /<<PKGBUILDDIR>> && runuser -u user42 -- dpkg-buildpackage --sanitize-env -us -uc -rfakeroot -S' failed to run.


The full build log is available from:
http://qa-logs.debian.net/2023/08/13/scikit-learn_1.2.1+dfsg-1_unstable.log

If you reassign this bug to another package, please mark it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with mine
so that we can identify if something relevant changed in the meantime.