[Bug 1974223] Re: FTBFS and autopkgtest failure since changes in apt for automatic kernel removal

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 2.3ubuntu0.3

---------------
unattended-upgrades (2.3ubuntu0.3) focal; urgency=medium

  * Fix FTBFS following change in the way apt detects automatically removable
    kernels (LP: #1974223)
  * Work around autopkgtest failure by removing __pycache__ in the test suite
    before the invocation of python-coverage (LP: #1974223)
  * Added new test depends on apt to trigger autopkgtest runs automatically
    when apt is upgraded.

unattended-upgrades (2.3ubuntu0.2) focal; urgency=medium

  [ Brian Murray ]
  * kernel/postinst.d/unattended-upgrades: check to see if canonical-livepatch
    is installed and enabled. In the event that it is and it says a reboot is
    required do not update reboot-required files so that only one reboot
    message appears in the message of the day. (LP: #1747499)

 -- Olivier Gayot <olivier.gayot at canonical.com>  Thu, 19 May 2022
19:38:48 +0200

** Changed in: unattended-upgrades (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1974223

Title:
  FTBFS and autopkgtest failure since changes in apt for automatic
  kernel removal

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Incomplete
Status in unattended-upgrades source package in Focal:
  Fix Released
Status in unattended-upgrades package in Debian:
  Fix Released

Bug description:
  [Impact]
  Since the following changes in apt have landed in focal-updates (and is currently in bionic-proposed), unattended-upgrades FTBFS and fails autopkgtest on both series:

    * Revert "Protect currently running kernel at run-time"
    * Backport Determine autoremovable kernels at run-time (LP: #1615381) as of
      2.4.5; including the change to only protect two kernels, not last installed
      one (LP: #1968154)

  ======================================================================
  FAIL: test_remove_unused_dependencies_new_unused_only (__main__.TestRemoveUnused)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "./test_remove_unused.py", line 165, in test_remove_unused_dependencies_new_unused_only
      haystack))
  AssertionError: False is not true : Can not find 'Removing unused kernel packages: linux-image-4.05.0-1021-kvm

  [Test plan]
  1. focal:
    * run autopkgtest against -updates:
      $ autopkgtest unattended-upgrades --apt-upgrade --apt-pocket=updates --test-name run-tests -- <virt-server ...>
    * try to build the package
  2. bionic:
    * run autopkgtest against -proposed:
      $ autopkgtest unattended-upgrades --apt-upgrade --apt-pocket=proposed --test-name run-tests -- <virt-server ...>
    * try to build the package

  [Where problems could occur]
    * The fix only affects the test-suite (that runs both at build time & autopkgtest time) so the impact should be minimal. Something wrong in the patch would make the unattended package FTBFS or fail autopkgtest but it is already failing ATM.
    * The new tests dependency on apt can trigger more autopkgtest runs. Since unattended-upgrades has a non-trivial autopkgtest suite, this can have a slight impact on the queues.

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