[Bug 1826870] Re: cache.commit() doesn't release the archives lock

[Julian Andres Klode]

xenial: None of the failures are regressions; the apport one we can also
see just with apport as trigger.

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Title:
  cache.commit() doesn't release the archives lock

Status in python-apt package in Ubuntu:
  Fix Released
Status in python-apt source package in Xenial:
  Fix Committed
Status in python-apt source package in Bionic:
  Fix Committed
Status in python-apt source package in Cosmic:
  Fix Released
Status in python-apt package in Debian:
  Fix Released

Bug description:
  [Impact]
  cache.commit() does not release all the locks it acquires as part of committing. This is a regression of locking fixes in bug 1795407.

  [Test case]
  This script should work:

  #!/usr/bin/env python
  import apt
  import subprocess

  cache = apt.Cache()
  pkg = cache["hello"]
  pkg.mark_install()
  cache.commit()
  subprocess.check_call(["apt", "remove", "--yes", "hello"])

  [Regression potential]
  Other new locking bugs could pop up

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