[Bug 1905735] Re: ubuntu-image autopkgtests failing since pytohn-debian 0.1.38

[Christian Ehrhardt ]

Seb has opened: https://code.launchpad.net/~seb128/ubuntu-image/+git/ubuntu-image/+merge/394533
It is idential to what I build and tested in https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4353/+packages
If we don't want to wait and retrigger the tests with the new version, here a hint: https://code.launchpad.net/~paelzer/britney/+git/hints-ubuntu/+merge/394535

** Bug watch added: Debian Bug tracker #975910
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=975910

** Also affects: python-debian (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=975910
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1905735

Title:
  ubuntu-image autopkgtests failing since python-debian 0.1.38

Status in python-debian package in Ubuntu:
  Triaged
Status in ubuntu-image package in Ubuntu:
  Fix Committed
Status in python-debian package in Debian:
  Unknown

Bug description:
  In the tests it seems that since some - yet to be found - change ~20th
  Nov the tests of ubuntu-image fail.

  Tests all list those three sub-tests as failing:
   unittests.sh         FAIL non-zero exit status 1
   qa                   FAIL non-zero exit status 1
   coverage.sh          FAIL non-zero exit status 1

  Fails all seem to be related to some python/pytest/py* change that
  might have slipped in without gating on this test.

  Ubuntu-image itself also isn't new - still the same as in groovy
   ubuntu-image | 1.10+20.10ubuntu2 | groovy         | source, all
   ubuntu-image | 1.10+20.10ubuntu2 | hirsute        | source, all

  ================================== log start ===================================
  Obtaining file:///tmp/autopkgtest.ZuL7Da/build.chY/src
      ERROR: Command errored out with exit status 1:
       command: /tmp/autopkgtest.ZuL7Da/build.chY/src/.tox/py38-nocov/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/autopkgtest.ZuL7Da/build.chY/src/setup.py'"'"'; __file__='"'"'/tmp/autopkgtest.ZuL7Da/build.chY/src/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-yaplrymq
           cwd: /tmp/autopkgtest.ZuL7Da/build.chY/src/
      Complete output (5 lines):
      Traceback (most recent call last):
        File "<string>", line 1, in <module>
        File "/tmp/autopkgtest.ZuL7Da/build.chY/src/setup.py", line 49, in <module>
          __version__ = str(Changelog(infp).get_version())
      AttributeError: 'Changelog' object has no attribute 'get_version'
      ----------------------------------------
  ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  =================================== log end ====================================

  The issue reproducible in local KVM-autopkgtest against hirsute-proposed and hirsute-release for me (I mistyped before).
  Example:
   sudo ~/work/autopkgtest/autopkgtest/runner/autopkgtest --no-built-binaries --apt-upgrade --apt-pocket=proposed --shell-fail ubuntu-image_1.10+20.10ubuntu2.dsc --testname=qa -- qemu --qemu-options='-cpu host' --ram-size=1536 --cpus 2 ~/work/autopkgtest-hirsute-amd64.img

  
  In terms of similar bug signatures I found
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=973227
  Fixed by:
  https://gitlab.kitware.com/debian/dh-cmake/-/commit/3337c8e0e9ebd109490d3c40f0bd5c1e367bedc8

  Looking for the same issue in ubuntu-image has shown an entry in setup.py
    setup.py:49:        __version__ = str(Changelog(infp).get_version())

  And now that we know all that we see
  https://launchpad.net/ubuntu/+source/python-debian/+publishinghistory

  New version in since
  2020-11-20 02:23:27 CET

  That is a perfect match to our bug.


  $ diff -Naur python-debian-0.1.3[78]/lib/debian/changelog.py
  ...
  -    def get_version(self):
  -        # type: () -> Version
  +    def _get_version(self):
  +        # type: () -> Optional[Version]
           """Return a Version object for the last version"""
  -        return self._blocks[0].version
  +        return self._blocks[0].version   # type: ignore
  ...

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