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#!/usr/bin/python

#

# Copyright (C) 2010 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 utils.ResetTempfileModule"""

import os

import sys

import errno

import shutil

import tempfile

import unittest

import logging

from ganeti import utils

import testutils

# This constant is usually at a much higher value. Setting it lower for test

# purposes.

tempfile.TMP_MAX = 3

class TestResetTempfileModule(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testNoReset(self):

    self._Test(False)

  def testReset(self):

    self._Test(True)

  def _Test(self, reset):

    self.failIf(tempfile.TMP_MAX > 10)

    # Initialize tempfile module

    (fd, _) = tempfile.mkstemp(dir=self.tmpdir, prefix="init.", suffix="")

    os.close(fd)

    (notify_read, notify_write) = os.pipe()

    pid = os.fork()

    if pid == 0:

      # Child

      try:

        try:

          if reset:

            utils.ResetTempfileModule()

          os.close(notify_write)

          # Wait for parent to close pipe

          os.read(notify_read, 1)

          try:

            # This is a short-lived process, not caring about closing file

            # descriptors

            (_, path) = tempfile.mkstemp(dir=self.tmpdir,

                                         prefix="test.", suffix="")

          except EnvironmentError, err:

            if err.errno == errno.EEXIST:

              # Couldnt' create temporary file (e.g. because we run out of

              # retries)

              os._exit(2)

            raise

          logging.debug("Child created %s", path)

          os._exit(0)

        except Exception:

          logging.exception("Unhandled error")

      finally:

        os._exit(1)

    # Parent

    os.close(notify_read)

    # Create parent's temporary files

    for _ in range(tempfile.TMP_MAX):

      (fd, path) = tempfile.mkstemp(dir=self.tmpdir,

                                    prefix="test.", suffix="")

      os.close(fd)

      logging.debug("Parent created %s", path)

    # Notify child by closing pipe

    os.close(notify_write)

    (_, status) = os.waitpid(pid, 0)

    self.failIf(os.WIFSIGNALED(status))

    if reset:

      # If the tempfile module was reset, it should not fail to create

      # temporary files

      expected = 0

    else:

      expected = 2

    self.assertEqual(os.WEXITSTATUS(status), expected)

if __name__ == "__main__":

  testutils.GanetiTestProgram()