[Bug 1806463] Re: Unattended-Upgrade::InstallOnShutdown "true" not working

[Justin V]

BTW, in Debian stretch, the service runs the script via a "stop-script",
so the shutdown script is not called with --wait-for-signal, since it is
run at service-down which means it does not need to wait.  In that case,
it would seem that the signal would not be set, and the install-on-
shutdown logic would be triggered.

Don't know if stretch is ahead or behind or forked from cosmic.

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https://bugs.launchpad.net/bugs/1806463

Title:
  Unattended-Upgrade::InstallOnShutdown "true" not working

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  Cosmic, unattended-upgrades 1.5ubuntu3.18.10.0

  Trying to get install-on-shutdown working.  Added << Unattended-
  Upgrade::InstallOnShutdown "true"; >> to apt.conf.

  It appears that the logic for install-on-shutdown is in /usr/share
  /unattended-upgrades/unattended-upgrade-shutdown.  The logic for run-
  on-shutdown is in UnattendedUpgradesShutdown.try_iter_on_shutdown,
  which is only called by iter "if not
  self.stop_signal_received.is_set()".  However, since --wait-for-signal
  is true, it waits for a signal, then the iter says "signal recieved,
  so skip upgrade":

  1. apt.conf: Unattended-Upgrade::InstallOnShutdown "true" (though, unused)
  2. unattended-upgrades.service: .../unattended-upgrade-shutdown --wait-for-signal
  3. UnattendedUpgradesShutdown.run: signal_handler is installed; wait.
  4. UUS.run.signal_handler: stop_signal_received.set(); start_iterations()
  5. UUS.start_iterations: scheduler timer to call self.iter
  6. UUS.iter: not self.stop_signal_received.is_set() is always False
  7. UUS.try_iter_on_shutdown is never called

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