[Bug 1565767] Re: TagFile iteration raises SystemError when attempting to parse a signed .changes file

[Julian Andres Klode]

You have to use open_maybe_clear_signed_file() to open clearsigned files
which is available since python-apt 0.9.4. That they worked before was
more an implementation accident.

** Changed in: python-apt (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1565767

Title:
  TagFile iteration raises SystemError when attempting to parse a signed
  .changes file

Status in python-apt package in Ubuntu:
  Invalid

Bug description:
  Attempting to parse a .changes file using apt_pkg.TagFile such as
  http://paste.ubuntu.com/15611341/ raises a SystemError.

  http://paste.ubuntu.com/15611387/ contains a sample Python REPL with
  the given file.

  Note that this is a change in behaviour between Trusty and Xenial,
  parsing the same file in Trusty (python-apt 0.9.3.5ubuntu2) has no
  issues.

  The specific unit test that failed leading to this bug report is
  attempting to parse the .changes file when it is signed with an
  unknown key.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: python-apt 1.1.0~beta1build1
  ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr  4 15:04:29 2016
  InstallationDate: Installed on 2012-08-17 (1325 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.1)
  SourcePackage: python-apt
  UpgradeStatus: Upgraded to xenial on 2016-03-07 (28 days ago)

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