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

# 0.0510-1301, 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

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

    constants.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(constants.UIDPOOL_LOCKDIR):

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

    os.rmdir(constants.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()