[Bug 1815761] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for apt has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1815761

Title:
  Alternative to Dpkg::Post-Invoke that runs even if dpkg did not have
  to be invoked

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Fix Committed
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Cosmic:
  Fix Released
Status in apt source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Dpkg::Post-Invoke is run only when dpkg had to be run. We'd like to be able to show some extra output even if no changes had been made. Imagine "the user disabled the security repo, and does not get any updates shown scenario" - we'd like to be able to tell them that there are security updates available after all.

  [Test case]
  1. Specify an APT::Install::Post-Invoke-Success hook

  2. Make sure it runs even if there are no changes, using apt upgrade
  -tnow

  [Regression potential]
  No-change upgrades/install can now fail if this new hooks fail.

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