test/py/ganeti.uidpool_unittest.py

#!/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()