[Bug 1294531] Re: Unicode traceback saving empty SourcesList regression

[Julian Andres Klode]

Not only that, I also have a branch that fixes the issue:
   https://github.com/julian-klode/python-apt/tree/bugfix/unicode

But I do not know yet whether merging this force-utf-8 thing again is a
sensible thing to do. It turns out that if you run your applications in
a normal environment, you do not need to specify the encoding at all,
Python will use the encoding of the locale. I did not notice that when I
first merged the fix.

This basically only makes situations work where people use the "C"
locale when running their python-apt-using tools, and another locale in
normal use. And I do not think that should be supported. There is
C.UTF-8 for language agnostic environments, and every system has a
default locale that system-wide dbus services should use.

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https://bugs.launchpad.net/bugs/1294531

Title:
  Unicode traceback saving empty SourcesList regression

Status in “python-apt” package in Ubuntu:
  New

Bug description:
  Following the recent update to fix LP: #1069019 a regression was
  introduced when trying to save an empty SourcesList.

  
  >>> from aptsources.sourceslist import SourcesList
  >>> s = SourcesList(withMatcher=False)
  >>> s.save()

  /usr/lib/python2.7/dist-packages/aptsources/sourceslist.pyc in save(self)
      409 
      410             with io.open(path, "w", encoding="utf-8") as f:
  --> 411                 f.write(header)
      412             return
      413 

  TypeError: must be unicode, not str

  This is because the header that's added when there are no APT entries
  is a regular Python 2 string object, and not a unicode object.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: python-apt 0.9.3.3 [modified: usr/lib/python2.7/dist-packages/aptsources/sourceslist.py]
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Mar 19 10:11:04 2014
  InstallationDate: Installed on 2012-08-17 (578 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.1)
  SourcePackage: python-apt
  UpgradeStatus: Upgraded to trusty on 2014-02-08 (38 days ago)

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