Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2011 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for testing for an issue in PycURL"""

import sys

import warnings

import unittest

import textwrap

import pycurl

import testutils

DETAILS = [

  ("PycURL 7.19.0 added a new function named \"reset\" on \"pycurl.Curl\""

   " objects to release all references to other resources. Unfortunately that"

   " version contains a bug with reference counting on the \"None\" singleton,"

   " leading to a crash of the Python interpreter after a certain amount of"

   " performed requests. Your system uses a version of PycURL affected by this"

   " issue. A patch is available at [1]. A detailed description can be found"

   " at [2].\n"),

  "\n",

  ("[1] http://sf.net/tracker/?"

   "func=detail&aid=2893665&group_id=28236&atid=392777\n"),

  "[2] https://bugzilla.redhat.com/show_bug.cgi?id=624559",

  ]

class TestPyCurlReset(unittest.TestCase):

  def test(self):

    start_refcount = sys.getrefcount(None)

    abort_refcount = int(start_refcount * 0.8)

    assert start_refcount > 100

    curl = pycurl.Curl()

    try:

      reset_fn = curl.reset

    except AttributeError:

      pass

    else:

      for i in range(start_refcount * 2):

        reset_fn()

        # The bug can be detected if calling "reset" several times continously

        # reduces the number of references

        if sys.getrefcount(None) < abort_refcount:

          print >>sys.stderr, "#" * 78

          for line in DETAILS:

            print >>sys.stderr, textwrap.fill(line, width=78)

          print >>sys.stderr, "#" * 78

          break

if __name__ == "__main__":

  testutils.GanetiTestProgram()