[Bug 2006589] Re: Anacron service and timer disabled after upgrading from 2.3-33

[Adrien Nader]

I'm attaching a patch from 2.3.26ubuntu1 (kinetic's) to
2.3-36ubuntu2(~ppa2) which uses a heuristic to re-enable the service
and/or the timer if they were previously enabled. There are comments
inside the postinst/preinst scripts.

A typical test I used on my machine looked like the following:

  sudo dpkg -i ../lp/anacron_2.3-33ubuntu1_amd64.deb
  sudo systemctl enable anacron.timer
  sudo systemctl disable anacron.service
  sudo dpkg -i ../anacron_2.3-36ubuntu2\~ppa2_amd64.deb

The following displays the enabled/disabled status:

  systemctl show --property=UnitFileState  anacron.timer
  systemctl show --property=UnitFileState  anacron.service

As I mention in my changes, systemctl show/status have side-effects and
I have no idea why.

** Patch added: "anacron_2.3-36ubuntu1-to-2.3-36ubuntu2~ppa2.diff"
   https://bugs.launchpad.net/ubuntu/+source/anacron/+bug/2006589/+attachment/5645637/+files/anacron_2.3-36ubuntu1-to-2.3-36ubuntu2~ppa2.diff

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https://bugs.launchpad.net/bugs/2006589

Title:
  Anacron service and timer disabled after upgrading from 2.3-33

Status in anacron package in Ubuntu:
  Confirmed

Bug description:
  As hinted by https://lists.debian.org/debian-devel-
  announce/2022/11/msg00001.html , anacron 2.3-33's packaging has a bug
  which disables both the timer and service when its postrm script is
  invoked and that includes upgrades from this package.

  We need to work-around this issue since it is the version in kinetic.

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