[Bug 1702793] Re: Full backport SRU for unattended-upgrades

[Balint Reczey]

I'm collecting the fixes in Bionic's u-u for Xenial and it is close to
be ready for the full backport, but fixing LP: #178116 (or fixing all
cases where python-apt losses the lock) is a prerequisite for the
backport if we want to avoid an increased crash rate on Xenial.


** Changed in: unattended-upgrades (Ubuntu)
       Status: Confirmed => In Progress

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Title:
  Full backport SRU for unattended-upgrades

Status in unattended-upgrades package in Ubuntu:
  In Progress

Bug description:
  [Impact]

  * I would like to propose a one-off full backport of unattended-upgrades
  1.2ubuntu1 to Bionic, Artful, Xenial and possibly Trusty releases because selectively backporting fixes for crashes and for issues that made u-u unreliable would be more risky thanks to the huge number of fixes and the
  inter-dependencies between them.

  [Test Case]

  * Since this backport involves fixing several bugs and this bug itself covers the full backport I suggest that this bug should be considered verified when the following list of bugs are verified:
   - TODO add most important bugs
  and the following tests are passing:
   - TODO add tests not covered by bugs above

  [Regression Potential]

  * Due to this update covering the full backport unattended-upgrades can regress in any imaginable way including failing to install, upgrade, run, or removing essential packages from the system. Those are unlikely.
  * There are open bugs about u-u being slower than in the past, thus this may be a likely regression but IMO the pending speed optimizations should not be blocking the backport because the reliability issues are more important to fix and speed optimizations can be cherry-picked later.
  * LP: #1773033 is a regression causing u-u to not install upgrades on shutdown when the system was started on battery. I have a WIP fix and can add the fix to the SRU if needed.

  [Other Info]

  I asked for an exception for the package in following the SRU process:
  https://lists.ubuntu.com/archives/ubuntu-release/2018-May/004479.html

  I'm preparing the backport in ppa:rbalint/scratch and also run
  autopkgtests on it in addition to testing it manually in VMs.

  [Original Bug Text]

  Changes to support day-of-week patching and logging to syslog were
  added to upstream (https://github.com/mvo5/unattended-upgrades) over a
  year ago. These changes are not present in the latest Xenial nor
  Trusty packages (0.90 and 0.82.1) - requesting that these changes be
  pulled from upstream.

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