root / test / tempfile_fork_unittest.py @ 84e110aa
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#!/usr/bin/python
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#
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# Copyright (C) 2010, 2012 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Script for testing utils.ResetTempfileModule"""
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import os |
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import sys |
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import errno |
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import shutil |
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import tempfile |
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import unittest |
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import logging |
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from ganeti import utils |
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import testutils |
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# This constant is usually at a much higher value. Setting it lower for test
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# purposes.
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tempfile.TMP_MAX = 3
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class TestResetTempfileModule(unittest.TestCase): |
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def setUp(self): |
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self.tmpdir = tempfile.mkdtemp()
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def tearDown(self): |
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shutil.rmtree(self.tmpdir)
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def testNoReset(self): |
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if ((sys.hexversion >= 0x020703F0 and sys.hexversion < 0x03000000) or |
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sys.hexversion >= 0x030203F0):
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# We can't test the no_reset case on Python 2.7+
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return
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# evil Debian sid...
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if (hasattr(tempfile._RandomNameSequence, "rng") and |
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type(tempfile._RandomNameSequence.rng) == property): |
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return
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self._Test(False) |
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def testReset(self): |
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self._Test(True) |
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def _Test(self, reset): |
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self.failIf(tempfile.TMP_MAX > 10) |
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# Initialize tempfile module
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(fd, _) = tempfile.mkstemp(dir=self.tmpdir, prefix="init.", suffix="") |
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os.close(fd) |
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(notify_read, notify_write) = os.pipe() |
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pid = os.fork() |
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if pid == 0: |
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# Child
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try:
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try:
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if reset:
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utils.ResetTempfileModule() |
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os.close(notify_write) |
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# Wait for parent to close pipe
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os.read(notify_read, 1)
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try:
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# This is a short-lived process, not caring about closing file
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# descriptors
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(_, path) = tempfile.mkstemp(dir=self.tmpdir,
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prefix="test.", suffix="") |
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except EnvironmentError, err: |
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if err.errno == errno.EEXIST:
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# Couldnt' create temporary file (e.g. because we run out of
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# retries)
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os._exit(2)
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raise
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logging.debug("Child created %s", path)
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os._exit(0)
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except Exception: |
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logging.exception("Unhandled error")
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finally:
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os._exit(1)
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# Parent
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os.close(notify_read) |
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# Create parent's temporary files
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for _ in range(tempfile.TMP_MAX): |
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(fd, path) = tempfile.mkstemp(dir=self.tmpdir,
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prefix="test.", suffix="") |
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os.close(fd) |
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logging.debug("Parent created %s", path)
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# Notify child by closing pipe
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os.close(notify_write) |
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(_, status) = os.waitpid(pid, 0)
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self.failIf(os.WIFSIGNALED(status))
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if reset:
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# If the tempfile module was reset, it should not fail to create
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# temporary files
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expected = 0
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else:
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expected = 2
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self.assertEqual(os.WEXITSTATUS(status), expected)
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if __name__ == "__main__": |
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testutils.GanetiTestProgram() |