[Pkg-emacsen-addons] Bug#814620: elpa-magit: removal of elpa-magit makes files disappear from magit

[Andreas Beckmann]

Package: elpa-magit
Version: 2.5.0-1
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 magit/jessie
  # (1)
  apt-get install elpa-magit/sid
  apt-get remove elpa-magit
  # (2)

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

  /usr/share/info/magit.info.gz

This is a serious bug violating policy 7.6, see
https://www.debian.org/doc/debian-policy/ch-relationships.html#s-replaces
and also see the footnote that describes this incorrect behavior
https://www.debian.org/doc/debian-policy/footnotes.html#f53

The elpa-magit package has the following relationships with magit:

  Conflicts: n/a
  Breaks:    n/a
  Replaces:  magit
  Provides:  magit

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

2m9.0s ERROR: FAIL: After purging files have disappeared:
  /usr/share/info/magit.info.gz  owned by: elpa-magit

2m9.0s ERROR: FAIL: After purging files have been modified:
  /var/lib/dpkg/info/magit.list  not owned


cheers,

Andreas
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