Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2010, 2013 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 ganeti.backend"""

import mock

import os

import shutil

import tempfile

import testutils

import unittest

from ganeti import backend

from ganeti import constants

from ganeti import errors

from ganeti import hypervisor

from ganeti import netutils

from ganeti import objects

from ganeti import utils

class TestX509Certificates(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def test(self):

    (name, cert_pem) = backend.CreateX509Certificate(300, cryptodir=self.tmpdir)

    self.assertEqual(utils.ReadFile(os.path.join(self.tmpdir, name,

                                                 backend._X509_CERT_FILE)),

                     cert_pem)

    self.assert_(0 < os.path.getsize(os.path.join(self.tmpdir, name,

                                                  backend._X509_KEY_FILE)))

    (name2, cert_pem2) = \

      backend.CreateX509Certificate(300, cryptodir=self.tmpdir)

    backend.RemoveX509Certificate(name, cryptodir=self.tmpdir)

    backend.RemoveX509Certificate(name2, cryptodir=self.tmpdir)

    self.assertEqual(utils.ListVisibleFiles(self.tmpdir), [])

  def testNonEmpty(self):

    (name, _) = backend.CreateX509Certificate(300, cryptodir=self.tmpdir)

    utils.WriteFile(utils.PathJoin(self.tmpdir, name, "hello-world"),

                    data="Hello World")

    self.assertRaises(backend.RPCFail, backend.RemoveX509Certificate,

                      name, cryptodir=self.tmpdir)

    self.assertEqual(utils.ListVisibleFiles(self.tmpdir), [name])

class TestNodeVerify(testutils.GanetiTestCase):

  def setUp(self):

    testutils.GanetiTestCase.setUp(self)

    self._mock_hv = None

  def _GetHypervisor(self, hv_name):

    self._mock_hv = hypervisor.GetHypervisor(hv_name)

    self._mock_hv.ValidateParameters = mock.Mock()

    self._mock_hv.Verify = mock.Mock()

    return self._mock_hv

  def testMasterIPLocalhost(self):

    # this a real functional test, but requires localhost to be reachable

    local_data = (netutils.Hostname.GetSysName(),

                  constants.IP4_ADDRESS_LOCALHOST)

    result = backend.VerifyNode({constants.NV_MASTERIP: local_data}, None, {})

    self.failUnless(constants.NV_MASTERIP in result,

                    "Master IP data not returned")

    self.failUnless(result[constants.NV_MASTERIP], "Cannot reach localhost")

  def testMasterIPUnreachable(self):

    # Network 192.0.2.0/24 is reserved for test/documentation as per

    # RFC 5737

    bad_data =  ("master.example.com", "192.0.2.1")

    # we just test that whatever TcpPing returns, VerifyNode returns too

    netutils.TcpPing = lambda a, b, source=None: False

    result = backend.VerifyNode({constants.NV_MASTERIP: bad_data}, None, {})

    self.failUnless(constants.NV_MASTERIP in result,

                    "Master IP data not returned")

    self.failIf(result[constants.NV_MASTERIP],

                "Result from netutils.TcpPing corrupted")

  def testVerifyHvparams(self):

    test_hvparams = {constants.HV_XEN_CMD: constants.XEN_CMD_XL}

    test_what = {constants.NV_HVPARAMS: \

        [("mynode", constants.HT_XEN_PVM, test_hvparams)]}

    result = {}

    backend._VerifyHvparams(test_what, True, result,

                            get_hv_fn=self._GetHypervisor)

    self._mock_hv.ValidateParameters.assert_called_with(test_hvparams)

  def testVerifyHypervisors(self):

    hvname = constants.HT_XEN_PVM

    hvparams = {constants.HV_XEN_CMD: constants.XEN_CMD_XL}

    all_hvparams = {hvname: hvparams}

    test_what = {constants.NV_HYPERVISOR: [hvname]}

    result = {}

    backend._VerifyHypervisors(

        test_what, True, result, all_hvparams=all_hvparams,

        get_hv_fn=self._GetHypervisor)

    self._mock_hv.Verify.assert_called_with(hvparams=hvparams)

def _DefRestrictedCmdOwner():

  return (os.getuid(), os.getgid())

class TestVerifyRestrictedCmdName(unittest.TestCase):

  def testAcceptableName(self):

    for i in ["foo", "bar", "z1", "000first", "hello-world"]:

      for fn in [lambda s: s, lambda s: s.upper(), lambda s: s.title()]:

        (status, msg) = backend._VerifyRestrictedCmdName(fn(i))

        self.assertTrue(status)

        self.assertTrue(msg is None)

  def testEmptyAndSpace(self):

    for i in ["", " ", "\t", "\n"]:

      (status, msg) = backend._VerifyRestrictedCmdName(i)

      self.assertFalse(status)

      self.assertEqual(msg, "Missing command name")

  def testNameWithSlashes(self):

    for i in ["/", "./foo", "../moo", "some/name"]:

      (status, msg) = backend._VerifyRestrictedCmdName(i)

      self.assertFalse(status)

      self.assertEqual(msg, "Invalid command name")

  def testForbiddenCharacters(self):

    for i in ["#", ".", "..", "bash -c ls", "'"]:

      (status, msg) = backend._VerifyRestrictedCmdName(i)

      self.assertFalse(status)

      self.assertEqual(msg, "Command name contains forbidden characters")

class TestVerifyRestrictedCmdDirectory(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testCanNotStat(self):

    tmpname = utils.PathJoin(self.tmpdir, "foobar")

    self.assertFalse(os.path.exists(tmpname))

    (status, msg) = \

      backend._VerifyRestrictedCmdDirectory(tmpname, _owner=NotImplemented)

    self.assertFalse(status)

    self.assertTrue(msg.startswith("Can't stat(2) '"))

  def testTooPermissive(self):

    tmpname = utils.PathJoin(self.tmpdir, "foobar")

    os.mkdir(tmpname)

    for mode in [0777, 0706, 0760, 0722]:

      os.chmod(tmpname, mode)

      self.assertTrue(os.path.isdir(tmpname))

      (status, msg) = \

        backend._VerifyRestrictedCmdDirectory(tmpname, _owner=NotImplemented)

      self.assertFalse(status)

      self.assertTrue(msg.startswith("Permissions on '"))

  def testNoDirectory(self):

    tmpname = utils.PathJoin(self.tmpdir, "foobar")

    utils.WriteFile(tmpname, data="empty\n")

    self.assertTrue(os.path.isfile(tmpname))

    (status, msg) = \

      backend._VerifyRestrictedCmdDirectory(tmpname,

                                            _owner=_DefRestrictedCmdOwner())

    self.assertFalse(status)

    self.assertTrue(msg.endswith("is not a directory"))

  def testNormal(self):

    tmpname = utils.PathJoin(self.tmpdir, "foobar")

    os.mkdir(tmpname)

    os.chmod(tmpname, 0755)

    self.assertTrue(os.path.isdir(tmpname))

    (status, msg) = \

      backend._VerifyRestrictedCmdDirectory(tmpname,

                                            _owner=_DefRestrictedCmdOwner())

    self.assertTrue(status)

    self.assertTrue(msg is None)

class TestVerifyRestrictedCmd(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testCanNotStat(self):

    tmpname = utils.PathJoin(self.tmpdir, "helloworld")

    self.assertFalse(os.path.exists(tmpname))

    (status, msg) = \

      backend._VerifyRestrictedCmd(self.tmpdir, "helloworld",

                                   _owner=NotImplemented)

    self.assertFalse(status)

    self.assertTrue(msg.startswith("Can't stat(2) '"))

  def testNotExecutable(self):

    tmpname = utils.PathJoin(self.tmpdir, "cmdname")

    utils.WriteFile(tmpname, data="empty\n")

    (status, msg) = \

      backend._VerifyRestrictedCmd(self.tmpdir, "cmdname",

                                   _owner=_DefRestrictedCmdOwner())

    self.assertFalse(status)

    self.assertTrue(msg.startswith("access(2) thinks '"))

  def testExecutable(self):

    tmpname = utils.PathJoin(self.tmpdir, "cmdname")

    utils.WriteFile(tmpname, data="empty\n", mode=0700)

    (status, executable) = \

      backend._VerifyRestrictedCmd(self.tmpdir, "cmdname",

                                   _owner=_DefRestrictedCmdOwner())

    self.assertTrue(status)

    self.assertEqual(executable, tmpname)

class TestPrepareRestrictedCmd(unittest.TestCase):

  _TEST_PATH = "/tmp/some/test/path"

  def testDirFails(self):

    def fn(path):

      self.assertEqual(path, self._TEST_PATH)

      return (False, "test error 31420")

    (status, msg) = \

      backend._PrepareRestrictedCmd(self._TEST_PATH, "cmd21152",

                                    _verify_dir=fn,

                                    _verify_name=NotImplemented,

                                    _verify_cmd=NotImplemented)

    self.assertFalse(status)

    self.assertEqual(msg, "test error 31420")

  def testNameFails(self):

    def fn(cmd):

      self.assertEqual(cmd, "cmd4617")

      return (False, "test error 591")

    (status, msg) = \

      backend._PrepareRestrictedCmd(self._TEST_PATH, "cmd4617",

                                    _verify_dir=lambda _: (True, None),

                                    _verify_name=fn,

                                    _verify_cmd=NotImplemented)

    self.assertFalse(status)

    self.assertEqual(msg, "test error 591")

  def testCommandFails(self):

    def fn(path, cmd):

      self.assertEqual(path, self._TEST_PATH)

      self.assertEqual(cmd, "cmd17577")

      return (False, "test error 25524")

    (status, msg) = \

      backend._PrepareRestrictedCmd(self._TEST_PATH, "cmd17577",

                                    _verify_dir=lambda _: (True, None),

                                    _verify_name=lambda _: (True, None),

                                    _verify_cmd=fn)

    self.assertFalse(status)

    self.assertEqual(msg, "test error 25524")

  def testSuccess(self):

    def fn(path, cmd):

      return (True, utils.PathJoin(path, cmd))

    (status, executable) = \

      backend._PrepareRestrictedCmd(self._TEST_PATH, "cmd22633",

                                    _verify_dir=lambda _: (True, None),

                                    _verify_name=lambda _: (True, None),

                                    _verify_cmd=fn)

    self.assertTrue(status)

    self.assertEqual(executable, utils.PathJoin(self._TEST_PATH, "cmd22633"))

def _SleepForRestrictedCmd(duration):

  assert duration > 5

def _GenericRestrictedCmdError(cmd):

  return "Executing command '%s' failed" % cmd

class TestRunRestrictedCmd(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testNonExistantLockDirectory(self):

    lockfile = utils.PathJoin(self.tmpdir, "does", "not", "exist")

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    self.assertFalse(os.path.exists(lockfile))

    self.assertRaises(backend.RPCFail,

                      backend.RunRestrictedCmd, "test",

                      _lock_timeout=NotImplemented,

                      _lock_file=lockfile,

                      _path=NotImplemented,

                      _sleep_fn=sleep_fn,

                      _prepare_fn=NotImplemented,

                      _runcmd_fn=NotImplemented,

                      _enabled=True)

    self.assertEqual(sleep_fn.Count(), 1)

  @staticmethod

  def _TryLock(lockfile):

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    result = False

    try:

      backend.RunRestrictedCmd("test22717",

                               _lock_timeout=0.1,

                               _lock_file=lockfile,

                               _path=NotImplemented,

                               _sleep_fn=sleep_fn,

                               _prepare_fn=NotImplemented,

                               _runcmd_fn=NotImplemented,

                               _enabled=True)

    except backend.RPCFail, err:

      assert str(err) == _GenericRestrictedCmdError("test22717"), \

             "Did not fail with generic error message"

      result = True

    assert sleep_fn.Count() == 1

    return result

  def testLockHeldByOtherProcess(self):

    lockfile = utils.PathJoin(self.tmpdir, "lock")

    lock = utils.FileLock.Open(lockfile)

    lock.Exclusive(blocking=True, timeout=1.0)

    try:

      self.assertTrue(utils.RunInSeparateProcess(self._TryLock, lockfile))

    finally:

      lock.Close()

  @staticmethod

  def _PrepareRaisingException(path, cmd):

    assert cmd == "test23122"

    raise Exception("test")

  def testPrepareRaisesException(self):

    lockfile = utils.PathJoin(self.tmpdir, "lock")

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    prepare_fn = testutils.CallCounter(self._PrepareRaisingException)

    try:

      backend.RunRestrictedCmd("test23122",

                               _lock_timeout=1.0, _lock_file=lockfile,

                               _path=NotImplemented, _runcmd_fn=NotImplemented,

                               _sleep_fn=sleep_fn, _prepare_fn=prepare_fn,

                               _enabled=True)

    except backend.RPCFail, err:

      self.assertEqual(str(err), _GenericRestrictedCmdError("test23122"))

    else:

      self.fail("Didn't fail")

    self.assertEqual(sleep_fn.Count(), 1)

    self.assertEqual(prepare_fn.Count(), 1)

  @staticmethod

  def _PrepareFails(path, cmd):

    assert cmd == "test29327"

    return ("some error message", None)

  def testPrepareFails(self):

    lockfile = utils.PathJoin(self.tmpdir, "lock")

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    prepare_fn = testutils.CallCounter(self._PrepareFails)

    try:

      backend.RunRestrictedCmd("test29327",

                               _lock_timeout=1.0, _lock_file=lockfile,

                               _path=NotImplemented, _runcmd_fn=NotImplemented,

                               _sleep_fn=sleep_fn, _prepare_fn=prepare_fn,

                               _enabled=True)

    except backend.RPCFail, err:

      self.assertEqual(str(err), _GenericRestrictedCmdError("test29327"))

    else:

      self.fail("Didn't fail")

    self.assertEqual(sleep_fn.Count(), 1)

    self.assertEqual(prepare_fn.Count(), 1)

  @staticmethod

  def _SuccessfulPrepare(path, cmd):

    return (True, utils.PathJoin(path, cmd))

  def testRunCmdFails(self):

    lockfile = utils.PathJoin(self.tmpdir, "lock")

    def fn(args, env=NotImplemented, reset_env=NotImplemented,

           postfork_fn=NotImplemented):

      self.assertEqual(args, [utils.PathJoin(self.tmpdir, "test3079")])

      self.assertEqual(env, {})

      self.assertTrue(reset_env)

      self.assertTrue(callable(postfork_fn))

      trylock = utils.FileLock.Open(lockfile)

      try:

        # See if lockfile is still held

        self.assertRaises(EnvironmentError, trylock.Exclusive, blocking=False)

        # Call back to release lock

        postfork_fn(NotImplemented)

        # See if lockfile can be acquired

        trylock.Exclusive(blocking=False)

      finally:

        trylock.Close()

      # Simulate a failed command

      return utils.RunResult(constants.EXIT_FAILURE, None,

                             "stdout", "stderr406328567",

                             utils.ShellQuoteArgs(args),

                             NotImplemented, NotImplemented)

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    prepare_fn = testutils.CallCounter(self._SuccessfulPrepare)

    runcmd_fn = testutils.CallCounter(fn)

    try:

      backend.RunRestrictedCmd("test3079",

                               _lock_timeout=1.0, _lock_file=lockfile,

                               _path=self.tmpdir, _runcmd_fn=runcmd_fn,

                               _sleep_fn=sleep_fn, _prepare_fn=prepare_fn,

                               _enabled=True)

    except backend.RPCFail, err:

      self.assertTrue(str(err).startswith("Restricted command 'test3079'"

                                          " failed:"))

      self.assertTrue("stderr406328567" in str(err),

                      msg="Error did not include output")

    else:

      self.fail("Didn't fail")

    self.assertEqual(sleep_fn.Count(), 0)

    self.assertEqual(prepare_fn.Count(), 1)

    self.assertEqual(runcmd_fn.Count(), 1)

  def testRunCmdSucceeds(self):

    lockfile = utils.PathJoin(self.tmpdir, "lock")

    def fn(args, env=NotImplemented, reset_env=NotImplemented,

           postfork_fn=NotImplemented):

      self.assertEqual(args, [utils.PathJoin(self.tmpdir, "test5667")])

      self.assertEqual(env, {})

      self.assertTrue(reset_env)

      # Call back to release lock

      postfork_fn(NotImplemented)

      # Simulate a successful command

      return utils.RunResult(constants.EXIT_SUCCESS, None, "stdout14463", "",

                             utils.ShellQuoteArgs(args),

                             NotImplemented, NotImplemented)

    sleep_fn = testutils.CallCounter(_SleepForRestrictedCmd)

    prepare_fn = testutils.CallCounter(self._SuccessfulPrepare)

    runcmd_fn = testutils.CallCounter(fn)

    result = backend.RunRestrictedCmd("test5667",

                                      _lock_timeout=1.0, _lock_file=lockfile,

                                      _path=self.tmpdir, _runcmd_fn=runcmd_fn,

                                      _sleep_fn=sleep_fn,

                                      _prepare_fn=prepare_fn,

                                      _enabled=True)

    self.assertEqual(result, "stdout14463")

    self.assertEqual(sleep_fn.Count(), 0)

    self.assertEqual(prepare_fn.Count(), 1)

    self.assertEqual(runcmd_fn.Count(), 1)

  def testCommandsDisabled(self):

    try:

      backend.RunRestrictedCmd("test",

                               _lock_timeout=NotImplemented,

                               _lock_file=NotImplemented,

                               _path=NotImplemented,

                               _sleep_fn=NotImplemented,

                               _prepare_fn=NotImplemented,

                               _runcmd_fn=NotImplemented,

                               _enabled=False)

    except backend.RPCFail, err:

      self.assertEqual(str(err),

                       "Restricted commands disabled at configure time")

    else:

      self.fail("Did not raise exception")

class TestSetWatcherPause(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

    self.filename = utils.PathJoin(self.tmpdir, "pause")

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def testUnsetNonExisting(self):

    self.assertFalse(os.path.exists(self.filename))

    backend.SetWatcherPause(None, _filename=self.filename)

    self.assertFalse(os.path.exists(self.filename))

  def testSetNonNumeric(self):

    for i in ["", [], {}, "Hello World", "0", "1.0"]:

      self.assertFalse(os.path.exists(self.filename))

      try:

        backend.SetWatcherPause(i, _filename=self.filename)

      except backend.RPCFail, err:

        self.assertEqual(str(err), "Duration must be numeric")

      else:

        self.fail("Did not raise exception")

      self.assertFalse(os.path.exists(self.filename))

  def testSet(self):

    self.assertFalse(os.path.exists(self.filename))

    for i in range(10):

      backend.SetWatcherPause(i, _filename=self.filename)

      self.assertEqual(utils.ReadFile(self.filename), "%s\n" % i)

      self.assertEqual(os.stat(self.filename).st_mode & 0777, 0644)

class TestGetBlockDevSymlinkPath(unittest.TestCase):

  def setUp(self):

    self.tmpdir = tempfile.mkdtemp()

  def tearDown(self):

    shutil.rmtree(self.tmpdir)

  def _Test(self, name, idx):

    self.assertEqual(backend._GetBlockDevSymlinkPath(name, idx,

                                                     _dir=self.tmpdir),

                     ("%s/%s%s%s" % (self.tmpdir, name,

                                     constants.DISK_SEPARATOR, idx)))

  def test(self):

    for idx in range(100):

      self._Test("inst1.example.com", idx)

class TestGetInstanceList(unittest.TestCase):

  def setUp(self):

    self._test_hv = self._TestHypervisor()

    self._test_hv.ListInstances = mock.Mock(

      return_value=["instance1", "instance2", "instance3"] )

  class _TestHypervisor(hypervisor.hv_base.BaseHypervisor):

    def __init__(self):

      hypervisor.hv_base.BaseHypervisor.__init__(self)

  def _GetHypervisor(self, name):

    return self._test_hv

  def testHvparams(self):

    fake_hvparams = {constants.HV_XEN_CMD: constants.XEN_CMD_XL}

    hvparams = {constants.HT_FAKE: fake_hvparams}

    backend.GetInstanceList([constants.HT_FAKE], all_hvparams=hvparams,

                            get_hv_fn=self._GetHypervisor)

    self._test_hv.ListInstances.assert_called_with(hvparams=fake_hvparams)

class TestInstanceConsoleInfo(unittest.TestCase):

  def setUp(self):

    self._test_hv_a = self._TestHypervisor()

    self._test_hv_a.GetInstanceConsole = mock.Mock(

      return_value = objects.InstanceConsole(instance="inst", kind="aHy")

    )

    self._test_hv_b = self._TestHypervisor()

    self._test_hv_b.GetInstanceConsole = mock.Mock(

      return_value = objects.InstanceConsole(instance="inst", kind="bHy")

    )

  class _TestHypervisor(hypervisor.hv_base.BaseHypervisor):

    def __init__(self):

      hypervisor.hv_base.BaseHypervisor.__init__(self)

  def _GetHypervisor(self, name):

    if name == "a":

      return self._test_hv_a

    else:

      return self._test_hv_b

  def testRightHypervisor(self):

    dictMaker = lambda hyName: {

      "instance":{"hypervisor":hyName},

      "node":{},

      "hvParams":{},

      "beParams":{},

    }

    call = {

      'i1':dictMaker("a"),

      'i2':dictMaker("b"),

    }

    res = backend.GetInstanceConsoleInfo(call, get_hv_fn=self._GetHypervisor)

    self.assertTrue(res["i1"]["kind"] == "aHy")

    self.assertTrue(res["i2"]["kind"] == "bHy")

class TestGetHvInfo(unittest.TestCase):

  def setUp(self):

    self._test_hv = self._TestHypervisor()

    self._test_hv.GetNodeInfo = mock.Mock()

  class _TestHypervisor(hypervisor.hv_base.BaseHypervisor):

    def __init__(self):

      hypervisor.hv_base.BaseHypervisor.__init__(self)

  def _GetHypervisor(self, name):

    return self._test_hv

  def testGetHvInfoAllNone(self):

    result = backend._GetHvInfoAll(None)

    self.assertTrue(result is None)

  def testGetHvInfoAll(self):

    hvname = constants.HT_XEN_PVM

    hvparams = {constants.HV_XEN_CMD: constants.XEN_CMD_XL}

    hv_specs = [(hvname, hvparams)]

    backend._GetHvInfoAll(hv_specs, self._GetHypervisor)

    self._test_hv.GetNodeInfo.assert_called_with(hvparams=hvparams)

class TestApplyStorageInfoFunction(unittest.TestCase):

  _STORAGE_KEY = "some_key"

  _SOME_ARGS = ["some_args"]

  def setUp(self):

    self.mock_storage_fn = mock.Mock()

  def testApplyValidStorageType(self):

    storage_type = constants.ST_LVM_VG

    info_fn_orig = backend._STORAGE_TYPE_INFO_FN

    backend._STORAGE_TYPE_INFO_FN = {

        storage_type: self.mock_storage_fn

      }

    backend._ApplyStorageInfoFunction(

        storage_type, self._STORAGE_KEY, self._SOME_ARGS)

    self.mock_storage_fn.assert_called_with(self._STORAGE_KEY, self._SOME_ARGS)

    backend._STORAGE_TYPE_INFO_FN = info_fn_orig

  def testApplyInValidStorageType(self):

    storage_type = "invalid_storage_type"

    info_fn_orig = backend._STORAGE_TYPE_INFO_FN

    backend._STORAGE_TYPE_INFO_FN = {}

    self.assertRaises(KeyError, backend._ApplyStorageInfoFunction,

                      storage_type, self._STORAGE_KEY, self._SOME_ARGS)

    backend._STORAGE_TYPE_INFO_FN = info_fn_orig

  def testApplyNotImplementedStorageType(self):

    storage_type = "not_implemented_storage_type"

    info_fn_orig = backend._STORAGE_TYPE_INFO_FN

    backend._STORAGE_TYPE_INFO_FN = {storage_type: None}

    self.assertRaises(NotImplementedError,

                      backend._ApplyStorageInfoFunction,

                      storage_type, self._STORAGE_KEY, self._SOME_ARGS)

    backend._STORAGE_TYPE_INFO_FN = info_fn_orig

class TestGetLvmVgSpaceInfo(unittest.TestCase):

  def testValid(self):

    path = "somepath"

    excl_stor = True

    orig_fn = backend._GetVgInfo

    backend._GetVgInfo = mock.Mock()

    backend._GetLvmVgSpaceInfo(path, [excl_stor])

    backend._GetVgInfo.assert_called_with(path, excl_stor)

    backend._GetVgInfo = orig_fn

  def testNoExclStorageNotBool(self):

    path = "somepath"

    excl_stor = "123"

    self.assertRaises(errors.ProgrammerError, backend._GetLvmVgSpaceInfo,

                      path, [excl_stor])

  def testNoExclStorageNotInList(self):

    path = "somepath"

    excl_stor = "123"

    self.assertRaises(errors.ProgrammerError, backend._GetLvmVgSpaceInfo,

                      path, excl_stor)

class TestGetLvmPvSpaceInfo(unittest.TestCase):

  def testValid(self):

    path = "somepath"

    excl_stor = True

    orig_fn = backend._GetVgSpindlesInfo

    backend._GetVgSpindlesInfo = mock.Mock()

    backend._GetLvmPvSpaceInfo(path, [excl_stor])

    backend._GetVgSpindlesInfo.assert_called_with(path, excl_stor)

    backend._GetVgSpindlesInfo = orig_fn

class TestCheckStorageParams(unittest.TestCase):

  def testParamsNone(self):

    self.assertRaises(errors.ProgrammerError, backend._CheckStorageParams,

                      None, NotImplemented)

  def testParamsWrongType(self):

    self.assertRaises(errors.ProgrammerError, backend._CheckStorageParams,

                      "string", NotImplemented)

  def testParamsEmpty(self):

    backend._CheckStorageParams([], 0)

  def testParamsValidNumber(self):

    backend._CheckStorageParams(["a", True], 2)

  def testParamsInvalidNumber(self):

    self.assertRaises(errors.ProgrammerError, backend._CheckStorageParams,

                      ["b", False], 3)

class TestGetVgSpindlesInfo(unittest.TestCase):

  def setUp(self):

    self.vg_free = 13

    self.vg_size = 31

    self.mock_fn = mock.Mock(return_value=(self.vg_free, self.vg_size))

  def testValidInput(self):

    name = "myvg"

    excl_stor = True

    result = backend._GetVgSpindlesInfo(name, excl_stor, info_fn=self.mock_fn)

    self.mock_fn.assert_called_with(name)

    self.assertEqual(name, result["name"])

    self.assertEqual(constants.ST_LVM_PV, result["type"])

    self.assertEqual(self.vg_free, result["storage_free"])

    self.assertEqual(self.vg_size, result["storage_size"])

  def testNoExclStor(self):

    name = "myvg"

    excl_stor = False

    result = backend._GetVgSpindlesInfo(name, excl_stor, info_fn=self.mock_fn)

    self.mock_fn.assert_not_called()

    self.assertEqual(name, result["name"])

    self.assertEqual(constants.ST_LVM_PV, result["type"])

    self.assertEqual(0, result["storage_free"])