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

[Justin V]

After reading the NEWS file, it seems that it is necessary for the dbus
signal to be sent first, at which point the upgrade begins.  Next, the
SIGTERM is received, but the upgrade has already started.  So, "shutdown
-r now" will not trigger an upgrade.

I'll need some time to be able to experiment with a reboot.  I was doing
"shutdown -r now".  Also, I am using xfce, so maybe it is not sending a
signal (either).

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

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

Status in unattended-upgrades package in Ubuntu:
  Incomplete

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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