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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** No longer affects: python-apt (Ubuntu)

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https://bugs.launchpad.net/bugs/1830635

Title:
  Regression: xenial: Uses apt_pkg.Error, which is only available in
  later versions

Status in python-apt source package in Xenial:
  Fix Committed

Bug description:
  [Impact]
  The last SRU introduced a regression in error handling, where apt_pkg.Error is being caught - but that class is not available in xenial - it still uses SystemError

  [Test case]

  Run python3 -c "import apt; apt.Cache().update()" while running apt
  update.

  You should see:

  # <command>
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 468, in update
      raise LockFailedException("Failed to lock %s" % lockfile)
  apt.cache.LockFailedException: Failed to lock /var/lib/apt/lists/lock

  Currently you see:
  # <command>
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 63, in __enter__
      return self._lock.__enter__()
  SystemError: E:Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 481, in update
      with _WrappedLock(apt_pkg.config.find_dir("Dir::State::Lists")):
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 64, in __enter__
      except apt_pkg.Error as e:
  AttributeError: module 'apt_pkg' has no attribute 'Error'

  [Regression potential]
  It really can't get worse than this. But FWIW: This only affects code paths where we could not lock the lists/ or archives/ directory - they currently throw the AttributeError, and will then throw LockFailedException again - as they did before the SRU.

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