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

[Adrien Nader]

1) Without the "systemctl show" in preinst, the "systemctl show" in postinst is wrong. Yes, that makes no sense.
Basically, the steps would be:
- systemctl enable anacron.service
- dpkg -i anacron 2.3-33
- (magic step)
- dpkg -i anacron 2.3-36 + my changes
  - in postinst, systemctl show anacron.service returns disabled unless "systemctl show anacron.service" is called during (magic step), which could also be in the new anacron's postinst.

TBH, I'm thinking "select isn't broken" but I also feel like I've tried
everything and this is the only change. I might also describe this
improperly. Maybe there's some cache effect, especially since the whole
issue here is related to changing configuration behind systemd's back.

2) I didn't consider doing that, mostly because I changed postinst late.
Basically I was debugging and somehow noticed the pattern that results
in postinst were right when I was debugging and only when I was
debugging. Probing only from preinst could be cleaner and it could also
make more sense overall since there would be less opportunities for
changes to have happened to the system. I need to look at that and
review the exact order in which the package scripts are being run.

I'll see what I can do following your idea in 2). Thanks.

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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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