[Python-modules-team] Bug#940919: python3-cxx-dev: removal of python3-cxx-dev makes files disappear from python-cxx-dev

[Andreas Beckmann]

Package: python3-cxx-dev
Version: 7.0.3-3
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts replaces-without-breaks

Hi,

during a test with piuparts and DOSE tools I noticed your package causes
removal of files that also belong to another package.
This is caused by using Replaces without corresponding Breaks.

The installation sequence to reproduce this problem is

  apt-get install python-cxx-dev/buster
  # (1)
  apt-get install python3-cxx-dev/bullseye
  apt-get remove python3-cxx-dev
  # (2)

The list of installed files at points (1) and (2) should be identical,
but the following files have disappeared:

  /usr/include/CXX/*
  /usr/src/CXX/*

This is a serious bug violating policy 7.6, see
https://www.debian.org/doc/debian-policy/ch-relationships.html#overwriting-files-and-replacing-packages-replaces
and also see the footnote that describes this incorrect behavior:
https://www.debian.org/doc/debian-policy/ch-relationships.html#id13

The python3-cxx-dev package has the following relationships with python-cxx-dev:

  Conflicts: n/a
  Breaks:    n/a
  Replaces:  python-cxx-dev (<< 7.0.3-3)

>From the attached log (scroll to the bottom...):

1m3.9s ERROR: FAIL: After purging files have disappeared:
  /usr/include/CXX/Config.hxx    owned by: python3-cxx-dev
  /usr/include/CXX/CxxDebug.hxx  owned by: python3-cxx-dev
  /usr/include/CXX/Exception.hxx         owned by: python3-cxx-dev
  /usr/include/CXX/Extensions.hxx        owned by: python3-cxx-dev
  /usr/include/CXX/IndirectPythonInterface.hxx   owned by: python3-cxx-dev
  /usr/include/CXX/Objects.hxx   owned by: python3-cxx-dev
  /usr/include/CXX/Version.hxx   owned by: python3-cxx-dev
  /usr/include/CXX/WrapPython.h  owned by: python3-cxx-dev
  /usr/lib/pkgconfig/PyCXX.pc    owned by: python3-cxx-dev
  /usr/src/CXX/IndirectPythonInterface.cxx       owned by: python3-cxx-dev
  /usr/src/CXX/cxx_exceptions.cxx        owned by: python3-cxx-dev
  /usr/src/CXX/cxx_extensions.cxx        owned by: python3-cxx-dev
  /usr/src/CXX/cxxextensions.c   owned by: python3-cxx-dev
  /usr/src/CXX/cxxsupport.cxx    owned by: python3-cxx-dev

1m3.9s ERROR: FAIL: After purging files have been modified:
  /var/lib/dpkg/info/python-cxx-dev.list         not owned


cheers,

Andreas
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