[Bug 1566333] Re: trusty → xenial upgrade fails to upgrade /etc/init.d/cron

[Martin Pitt]

So the situation is that the old cron
(https://launchpad.net/ubuntu/+source/cron/3.0pl1-124ubuntu2/+build/4287213/+files/cron_3.0pl1-124ubuntu2_amd64.deb)
just ships the symlink in the .deb, and the new cron ships the plain
file, and dpkg apparently refuses to replace a symlink with a file. This
is currently not handled in the maintainer scripts at all, so we need to
add some upgrade logic.

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https://bugs.launchpad.net/bugs/1566333

Title:
  trusty → xenial upgrade fails to upgrade /etc/init.d/cron

Status in cron package in Ubuntu:
  In Progress
Status in cron source package in Xenial:
  In Progress

Bug description:
  Upgrading from trusty to xenial is meant to replace "/etc/init.d/cron
  -> /lib/init/upstart-job" with a real file /etc/init.d/cron.

  This works fine in a schroot, but in a container or a VM you end up
  with

  lrwxrwxrwx 1 root root   21 Feb  9  2013 /etc/init.d/cron -> /lib/init/upstart-job
  -rwxr-xr-x 1 root root 3049 Feb 17 18:25 /etc/init.d/cron.dpkg-new

  Reproducer:

   - start trusty container or VM
   - echo 'deb     http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse' | sudo tee /etc/apt/sources.list
   - sudo apt update
   - sudo apt-get install -y cron

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