Bug#794948: cyphesis-cpp: prompting due to modified conffiles which were not modified by the user: /etc/cyphesis/cyphesis.vconf

[Andreas Beckmann]

Package: cyphesis-cpp
Version: 0.6.0-3
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts

Hi,

during a test with piuparts I noticed your package failed the piuparts
upgrade test because dpkg detected a conffile as being modified and then
prompted the user for an action. As there is no user input, this fails.
But this is not the real problem, the real problem is that this prompt
shows up in the first place, as there was nobody modifying this conffile
at all, the package has just been installed and upgraded...

This is a violation of policy 10.7.3, see
https://www.debian.org/doc/debian-policy/ch-files.html#s10.7.3,
which says "[These scripts handling conffiles] must not ask unnecessary
questions (particularly during upgrades), and must otherwise be good
citizens."

https://wiki.debian.org/DpkgConffileHandling should help with figuring
out how to do this properly.

In https://lists.debian.org/debian-devel/2009/08/msg00675.html and
followups it has been agreed that these bugs are to be filed with
severity serious.

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

  Setting up postgresql (9.4+169) ...
  Setting up cyphesis-cpp (0.6.0-3+b1) ...
  
  Configuration file '/etc/cyphesis/cyphesis.vconf'
   ==> Modified (by you or by a script) since installation.
   ==> Package distributor has shipped an updated version.
     What would you like to do about it ?  Your options are:
      Y or I  : install the package maintainer's version
      N or O  : keep your currently-installed version
        D     : show the differences between the versions
        Z     : start a shell to examine the situation
   The default action is to keep your current version.
  *** cyphesis.vconf (Y/I/N/O/D/Z) [default=N] ? dpkg: error processing package cyphesis-cpp (--configure):
   end of file on stdin at conffile prompt
  Setting up libdbus-1-3:amd64 (1.8.20-1) ...
  Setting up libreadline5:amd64 (5.2+dfsg-3) ...
  Processing triggers for libc-bin (2.19-19) ...
  Processing triggers for systemd (222-2) ...
  Errors were encountered while processing:
   cyphesis-cpp

This is a followup to #767818 and can be observed on upgrades from
squeeze (the last release that shipped cyphesis-cpp) to wheezy to
jessie (always keeping cyphesis-cpp from squeeze installed) and
finally to stretch (which again has a new version of cyphesis-cpp.

You probably need to undo the editing performed by the predecessor
packages in the preinst.


cheers,

Andreas
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