[Bug 2001568] [NEW] unattended-upgrades 2.9.1+nmu2ubuntu1 failing autopkgtest on arm64

[Dave Jones]

Public bug reported:

u-u is currently failing autopkgtest on arm64. It does not look like
this is a new failure (2.8ubuntu1 appears to have had exactly the same
failure) but it's due to the kernel-patterns test assuming that kernel
flavors cannot be a suffix of each other. This is true under Debian, and
under several architectures on Ubuntu, but the arm64 architecture on
Ubuntu has -generic and -generic-64k flavors which cause the test to
fail.

The attached debdiff corrects the test for this case.

One may wonder why the test currently passes under armhf, which has
-generic and -generic-lpae flavors (I certainly did!). It turns out this
is only because Ubuntu autopkgtest runs armhf in a container so the
kernel release reported by "uname -r" (used in the test) does not
meaningfully match anything in the apt cache.

Given this, the attached debdiff also restricts the kernel-patterns test
to isolation-machine as the test assumes a meaningful link between the
running kernel and the packages in the archive which is only true in a
VM or on the bare metal.

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "uu-arm64-kernels.patch"
   https://bugs.launchpad.net/bugs/2001568/+attachment/5639008/+files/uu-arm64-kernels.patch

** Patch removed: "uu-arm64-kernels.patch"
   https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/2001568/+attachment/5639008/+files/uu-arm64-kernels.patch

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https://bugs.launchpad.net/bugs/2001568

Title:
  unattended-upgrades 2.9.1+nmu2ubuntu1 failing autopkgtest on arm64

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  u-u is currently failing autopkgtest on arm64. It does not look like
  this is a new failure (2.8ubuntu1 appears to have had exactly the same
  failure) but it's due to the kernel-patterns test assuming that kernel
  flavors cannot be a suffix of each other. This is true under Debian,
  and under several architectures on Ubuntu, but the arm64 architecture
  on Ubuntu has -generic and -generic-64k flavors which cause the test
  to fail.

  The attached debdiff corrects the test for this case.

  One may wonder why the test currently passes under armhf, which has
  -generic and -generic-lpae flavors (I certainly did!). It turns out
  this is only because Ubuntu autopkgtest runs armhf in a container so
  the kernel release reported by "uname -r" (used in the test) does not
  meaningfully match anything in the apt cache.

  Given this, the attached debdiff also restricts the kernel-patterns
  test to isolation-machine as the test assumes a meaningful link
  between the running kernel and the packages in the archive which is
  only true in a VM or on the bare metal.

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