[Bug 1758529] Re: landscape-package-changer crashed with io.UnsupportedOperation in pulse(): fileno

[Chris Johnston]

On both bionic and eoan I installed postgres packages from Landscape
with both the current version and the proposed version of Landscape
client. Errors were seen with the current version and they were gone in
the proposed version.

** Tags removed: verification-needed-eoan
** Tags added: verification-done-eoan

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Title:
  landscape-package-changer crashed with io.UnsupportedOperation in
  pulse(): fileno

Status in Landscape Client:
  Fix Committed
Status in landscape-client package in Ubuntu:
  Fix Released
Status in python-apt package in Ubuntu:
  Invalid
Status in landscape-client source package in Bionic:
  Fix Committed
Status in python-apt source package in Bionic:
  Invalid
Status in landscape-client source package in Disco:
  Won't Fix
Status in python-apt source package in Disco:
  Invalid
Status in landscape-client source package in Eoan:
  Fix Committed
Status in python-apt source package in Eoan:
  Invalid

Bug description:
  [Impact]

   * landscape-package-changer will output stack traces when executed
     with python3. This adds noise in the logs and confuse apport into
     thinking there was a crash, even though the error does not affect
     functionality.

   * The activity log for package operations will also show errors.

   * The patch overrides python-apt reporting of progress, as
     landscape-package-changer is never executed from a terminal.

  [Test Case]

   * register landscape-client and wait for packages to be reported.

   * trigger a package installation from the landscape server.

   * check /var/log/landscape/manager.log for Package changer warnings

  [Regression Potential]

   * The change is trivially simple.

   * The changed code path is only used by python-apt progress reporting.
     Since landscape-package-changer does not rely on it and is able
     to continue, other errors would likely have the same fate: that is
     crashing the progress reporting thread and continuing.

  [Original Description]

  Crash in the background

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: landscape-client 18.01-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  Date: Sat Mar 24 07:05:34 2018
  ExecutablePath: /usr/bin/landscape-package-changer
  InstallationDate: Installed on 2015-07-04 (994 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  InterpreterPath: /usr/bin/python3.6
  ProcCmdline: /usr/bin/python3 /usr/bin/landscape-package-changer --quiet
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
  Python3Details: /usr/bin/python3.6, Python 3.6.5rc1, python3-minimal, 3.6.4-1
  PythonArgs: ['/usr/bin/landscape-package-changer', '--quiet']
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  SourcePackage: landscape-client
  Title: landscape-package-changer crashed with io.UnsupportedOperation in pulse(): fileno
  Traceback:
   Traceback (most recent call last):
     File "/usr/lib/python3/dist-packages/apt/progress/text.py", line 164, in pulse
       not os.isatty(self._file.fileno())):
   io.UnsupportedOperation: fileno
  UpgradeStatus: Upgraded to bionic on 2018-03-15 (8 days ago)
  UserGroups:

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