[Bug 1906436] Autopkgtest regression report (update-notifier/3.168.13)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted update-notifier (3.168.13) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

update-manager/1:16.04.17 (armhf)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/xenial/update_excuses.html#update-notifier

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1906436

Title:
  Resolve autopkgtest failures Pep8/pyflakes on Xenial and Bionic

Status in update-notifier package in Ubuntu:
  Fix Released
Status in update-notifier source package in Xenial:
  Fix Committed
Status in update-notifier source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  - autopkgtest failures on for Xenial(pep8) and Bionic(pep8 & pyflakes)

  - Cherry-picking upstream changes for ESM Product renaming and messaging
    for bug 1901627 trigger these issues.

  - Also changes in the Xenial base cloud-images used for testing dropped
    pep8 package from the build environment and unittests rely on calling
    pep8 on Xenial and Bionic. minimally a build-depends on pep8 needs to be
    added and pep8 test failures addresssed for Xenial. Bionic also needs
    minor pyflakes fixes from master.

  [Test Case]

   * Testing is "implicit", build time and autopkgtest tests have to
     succeed as we'd expect anyway.

  [Where problems could occur]

   * These are whitespace/indent/style changes that should (tm) be totally
     without an effect other than for the code-checker. Never the less by
     changing code always something could happen. In this case the changes
     are local to apt_check, package-data-downloader, backend_helper and
     hooks. So in these subfunctions of update-notifier issue would be
     expected.

  [Other Info]

   * This does not directly affect Focal or later because update-notifier
     moved to pycodestyle validation in tests instead of using pep8.
   * The Xenial upload will throw errors of some epxect-to-fail tests that 
     are misleading. We've spent too many iterations on looking at these so 
     they are silenced while fixing the test anyway.

  --- ---

  Initial pep8 build-dependency error on Xenial/Bionic autopkgtests:

  Fetched 4 B in 0s (0 B/s)
  ....Get:1 http://localhost:17195/canary-file.txt [4 B]
  Fetched 4 B in 0s (0 B/s)
  .E
  ======================================================================
  ERROR: test_pep8_clean (test_pep8.TestPep8Clean)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.RQGkx9/build.3cC/src/tests/test_pep8.py", line 32, in test_pep8_clean
      ["pep8", "--ignore={0}".format(IGNORE_PEP8), py_file])
    File "/usr/lib/python3.5/subprocess.py", line 557, in call
      with Popen(*popenargs, **kwargs) as p:
    File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
      restore_signals, start_new_session)
    File "/usr/lib/python3.5/subprocess.py", line 1551, in _execute_child
      raise child_exception_type(errno_num, err_msg)
  FileNotFoundError: [Errno 2] No such file or directory: 'pep8'

  Once resolving the build-depends: example pep8 test failures: seen
  running nosetests3 on update-notifier on Xenial amd Bionic

  ./tmp/autopkgtest.wN63go/build.IFg/src/tests/../data/apt_check.py:157:21:
  W503 line break before binary operator ....

  autopackage test failure logs showing missing pep8 dependency:

  xenial: update-notifier/3.168.11
     - autopkg logs: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/amd64/u/update-notifier/20201016_043912_51752@/log.gz

  bionic: update-notifier/3.192.1.8
      - autopkg failures: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/u/update-notifier/20201016_045656_8c126@/log.gz

  focal: update-notifier/3.192.30.1
    - rejected this upload in Focal to reduce SRU thrashing because a followup will be provided for Focal anyway to sync with Xenial and Bionic.

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