[Bug 1707880] Re: newly installed additional units are not started on upgrade

[Dimitri John Ledkov]

Or as per adam. If the deb-systemd-invoke tracks magic state at install
time, and knows which units are brand new, it should do start on those,
and retry-start on the known updated units.

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https://bugs.launchpad.net/bugs/1707880

Title:
  newly installed additional units are not started on upgrade

Status in apt package in Ubuntu:
  New
Status in debhelper package in Ubuntu:
  New
Status in apt source package in Zesty:
  New
Status in debhelper source package in Zesty:
  New
Status in apt source package in Artful:
  New
Status in debhelper source package in Artful:
  New

Bug description:
  Upon upgrading apt from a version that only ships apt-daily.timer to
  the one that ships apt-daily.timer and apt-daily-upgrade.timer, the
  latter is not started on zesty and later.

  I believe this may be a bug in dh_systemd_start:

  # Automatically added by dh_systemd_start
  if [ -d /run/systemd/system ]; then
  	systemctl --system daemon-reload >/dev/null || true
  	if [ -n "$2" ]; then
  		_dh_action=try-restart
  	else
  		_dh_action=start
  	fi
  	deb-systemd-invoke $_dh_action apt-daily-upgrade.timer apt-daily.timer >/dev/null || true
  fi
  # End automatically added section

  This reduces to:
  deb-systemd-invoke try-restart apt-daily-upgrade.timer apt-daily.timer >/dev/null || true

  which is (after calling/checking policy-rc.d) is:
  systemctl try-restart apt-daily-upgrade.timer apt-daily.timer >/dev/null || true

  This is correct, for the apt-daily.timer and does nothing for the apt-
  daily-upgrade.timer. Since apt-daily-upgrade.timer is not active, try-
  restart does not start it.

  Imho, there should be an extra snippet in apt.postinst which does
  this:

  if [ -d /run/systemd/system ]; then
  	if dpkg --compare $2 with version that introduces apt-daily-upgrade.timer; then
          	deb-systemd-invoke start apt-daily-upgrade.timer >/dev/null || true
  	fi
  fi

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