[issue5689] Support xz compression in tarfile module

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

This failure seems to crop up often, but not on every run:

  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3941/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3940/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3937/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3929/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3921/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3916/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3914/steps/test/logs/stdio
  http://www.python.org/dev/buildbot/all/builders/x86%20XP-5%203.x/builds/3906/steps/test/logs/stdio

I've been able to reproduce the failure on my own XP machine;
I'll investigate it over the weekend.

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<http://bugs.python.org/issue5689>
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