[Bug 1742378] Re: Slight glitch in /etc/cron.daily/apt-compat Ubuntu 16.04.3 in apt-1.2.24

[rklemme]

I forgot to mention one thing about the patch: the current behavior is
that when on_ac_power returns 255 the current version of the script
returns with that non zero error code and does not execute
/usr/lib/apt/apt.systemd.daily.  The patched version will execute
/usr/lib/apt/apt.systemd.daily and terminate with whatever exit code
that process generates.

On a side note, "which" can be replaced by "type" which is POSIX
compatible and a shell built in.

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https://bugs.launchpad.net/bugs/1742378

Title:
  Slight glitch in /etc/cron.daily/apt-compat Ubuntu 16.04.3 in
  apt-1.2.24

Status in apt package in Ubuntu:
  Triaged

Bug description:
  I accidentally stumbled across this. If in line 22 on_ac_power returns
  a non zero exit code the next line is never reached. Instead, the
  shell terminates immediately with that non zero exit code because of
  "set -e" in line 3. In this script it does not pose a problem because
  the shell is asked to exit anyway if check_power() returns non zero
  but it works differently than is apparently intended (concluding from
  the logic).

  I will attach a suggest patch and a demo illustrating that the patch
  works as the original script seems to intend to.

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