Synnefo » snf-ganeti

#!/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 unittesting the uidpool module"""

import os

import tempfile

import unittest

from ganeti import constants

from ganeti import uidpool

from ganeti import errors

from ganeti import pathutils

import testutils

class TestUidPool(testutils.GanetiTestCase):

  """Uid-pool tests"""

  def setUp(self):

    self.old_uid_min = constants.UIDPOOL_UID_MIN

    self.old_uid_max = constants.UIDPOOL_UID_MAX

    constants.UIDPOOL_UID_MIN = 1

    constants.UIDPOOL_UID_MAX = 10

    pathutils.UIDPOOL_LOCKDIR = tempfile.mkdtemp()

  def tearDown(self):

    constants.UIDPOOL_UID_MIN = self.old_uid_min

    constants.UIDPOOL_UID_MAX = self.old_uid_max

    for name in os.listdir(pathutils.UIDPOOL_LOCKDIR):

      os.unlink(os.path.join(pathutils.UIDPOOL_LOCKDIR, name))

    os.rmdir(pathutils.UIDPOOL_LOCKDIR)

  def testParseUidPool(self):

    self.assertEqualValues(

        uidpool.ParseUidPool("1-100,200,"),

        [(1, 100), (200, 200)])

    self.assertEqualValues(

        uidpool.ParseUidPool("1000:2000-2500", separator=":"),

        [(1000, 1000), (2000, 2500)])

    self.assertEqualValues(

        uidpool.ParseUidPool("1000\n2000-2500", separator="\n"),

        [(1000, 1000), (2000, 2500)])

  def testCheckUidPool(self):

    # UID < UIDPOOL_UID_MIN

    self.assertRaises(errors.OpPrereqError,

                      uidpool.CheckUidPool,

                      [(0, 0)])

    # UID > UIDPOOL_UID_MAX

    self.assertRaises(errors.OpPrereqError,

                      uidpool.CheckUidPool,

                      [(11, 11)])

    # lower boundary > higher boundary

    self.assertRaises(errors.OpPrereqError,

                      uidpool.CheckUidPool,

                      [(2, 1)])

  def testFormatUidPool(self):

    self.assertEqualValues(

        uidpool.FormatUidPool([(1, 100), (200, 200)]),

        "1-100, 200")

    self.assertEqualValues(

        uidpool.FormatUidPool([(1, 100), (200, 200)], separator=":"),

        "1-100:200")

    self.assertEqualValues(

        uidpool.FormatUidPool([(1, 100), (200, 200)], separator="\n"),

        "1-100\n200")

  def testRequestUnusedUid(self):

    # Check with known used user-ids

    #

    # Test with user-id "0" and with our own user-id, both

    # of which are guaranteed to be used user-ids

    for uid in 0, os.getuid():

      self.assertRaises(errors.LockError,

                        uidpool.RequestUnusedUid,

                        set([uid]))

    # Check with a single, known unused user-id

    #

    # We use "-1" here, which is not a valid user-id, so it's

    # guaranteed that it's unused.

    uid = uidpool.RequestUnusedUid(set([-1]))

    self.assertEqualValues(uid.GetUid(), -1)

    # Check uid-pool exhaustion

    #

    # uid "-1" is locked now, so RequestUnusedUid is expected to fail

    self.assertRaises(errors.LockError,

                      uidpool.RequestUnusedUid,

                      set([-1]))

    # Check unlocking

    uid.Unlock()

    # After unlocking, "-1" should be available again

    uid = uidpool.RequestUnusedUid(set([-1]))

    self.assertEqualValues(uid.GetUid(), -1)

if __name__ == "__main__":

  testutils.GanetiTestProgram()