[Bug 1260297] Re: status_update not sent any more, causes eternal hang on conffile prompts

[Martin Pitt]

I bisected this down to
http://anonscm.debian.org/gitweb/?p=apt/apt.git;a=commitdiff;h=11ef54810d

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Title:
  status_update not sent any more, causes eternal hang on conffile
  prompts in aptdaemon

Status in “apt” package in Ubuntu:
  Triaged
Status in “apt” source package in Trusty:
  Triaged

Bug description:
  On November 23, aptdaemon started to fail its tests [1]. In
  particular, it now eternally hangs in the conffile tests, which is
  reproducible locally perfectly well (on current trusty):

  $ PYTHONPATH=. python3 tests/test_configfileprompt.py ConfigFilePromptTestCase.test_keep
  [...]
  13:04:03 AptDaemon.Trans [DEBUG]: Emitting PropertyChanged: StatusDetails, silly-config wird konfiguriert
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]: Setting up silly-config (0.1-0) ...
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]: 
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]: Configuration file `/etc/silly-packages.cfg' (actually `/tmp/tmp8q_w7btmp/etc/silly-packages.cfg')
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:  ==> File on system created by you or by a script.
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:  ==> File also in package provided by package maintainer.
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:    What would you like to do about it ?  Your options are:
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:     Y or I  : install the package maintainer's version
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:     N or O  : keep your currently-installed version
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:       D     : show the differences between the versions
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:       Z     : start a shell to examine the situation
  13:04:03 AptDaemon.Worker.Terminal [DEBUG]:  The default action is to keep your current version.

  After that it hangs eternally, you need to run "killall dpkg" to
  finish this.

  This coincides with the large apt update from  0.9.9.1~ubuntu5 to
  0.9.13~exp1ubuntu1 [2]; dpkg or aptdaemon itself haven't been uploaded
  in a while, so I'm fairly certain that either this is a regression in
  apt, or some deliberate new behaviour for which aptdaemon needs to be
  updated.

  I already ensured that the fix for bug 1254696 (Apt::Keep-Fds) does
  not help, and apparently aptdaemon does not even use that.

  [1] https://jenkins.qa.ubuntu.com/job/trusty-adt-aptdaemon/?
  [2] https://launchpad.net/ubuntu/+source/apt/0.9.13~exp1ubuntu1

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