Synnefo » snf-ganeti » ganeti-local

#!/usr/bin/python

#

# Copyright (C) 2006, 2007, 2010, 2011, 2012, 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.

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# You should have received a copy of the GNU General Public License

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for unittesting the config module"""

import unittest

import os

import tempfile

import operator

from ganeti import bootstrap

from ganeti import config

from ganeti import constants

from ganeti import errors

from ganeti import objects

from ganeti import utils

from ganeti import netutils

from ganeti import compat

from ganeti.cmdlib import instance

from ganeti.config import TemporaryReservationManager

import testutils

import mocks

import mock

def _StubGetEntResolver():

  return mocks.FakeGetentResolver()

class TestConfigRunner(unittest.TestCase):

  """Testing case for HooksRunner"""

  def setUp(self):

    fd, self.cfg_file = tempfile.mkstemp()

    os.close(fd)

    self._init_cluster(self.cfg_file)

  def tearDown(self):

    try:

      os.unlink(self.cfg_file)

    except OSError:

      pass

  def _get_object(self):

    """Returns an instance of ConfigWriter"""

    cfg = config.ConfigWriter(cfg_file=self.cfg_file, offline=True,

                              _getents=_StubGetEntResolver)

    return cfg

  def _init_cluster(self, cfg):

    """Initializes the cfg object"""

    me = netutils.Hostname()

    ip = constants.IP4_ADDRESS_LOCALHOST

    # master_ip must not conflict with the node ip address

    master_ip = "127.0.0.2"

    cluster_config = objects.Cluster(

      serial_no=1,

      rsahostkeypub="",

      highest_used_port=(constants.FIRST_DRBD_PORT - 1),

      mac_prefix="aa:00:00",

      volume_group_name="xenvg",

      drbd_usermode_helper="/bin/true",

      nicparams={constants.PP_DEFAULT: constants.NICC_DEFAULTS},

      ndparams=constants.NDC_DEFAULTS,

      tcpudp_port_pool=set(),

      enabled_hypervisors=[constants.HT_FAKE],

      master_node=me.name,

      master_ip=master_ip,

      master_netdev=constants.DEFAULT_BRIDGE,

      cluster_name="cluster.local",

      file_storage_dir="/tmp",

      uid_pool=[],

      )

    master_node_config = objects.Node(name=me.name,

                                      primary_ip=me.ip,

                                      secondary_ip=ip,

                                      serial_no=1,

                                      master_candidate=True)

    bootstrap.InitConfig(constants.CONFIG_VERSION,

                         cluster_config, master_node_config, self.cfg_file)

  def _create_instance(self):

    """Create and return an instance object"""

    inst = objects.Instance(name="test.example.com",

                            uuid="test-uuid",

                            disks=[], nics=[],

                            disk_template=constants.DT_DISKLESS,

                            primary_node=self._get_object().GetMasterNode())

    return inst

  def testEmpty(self):

    """Test instantiate config object"""

    self._get_object()

  def testInit(self):

    """Test initialize the config file"""

    cfg = self._get_object()

    self.failUnlessEqual(1, len(cfg.GetNodeList()))

    self.failUnlessEqual(0, len(cfg.GetInstanceList()))

  def testUpdateCluster(self):

    """Test updates on the cluster object"""

    cfg = self._get_object()

    # construct a fake cluster object

    fake_cl = objects.Cluster()

    # fail if we didn't read the config

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_cl, None)

    cl = cfg.GetClusterInfo()

    # first pass, must not fail

    cfg.Update(cl, None)

    # second pass, also must not fail (after the config has been written)

    cfg.Update(cl, None)

    # but the fake_cl update should still fail

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_cl, None)

  def testUpdateNode(self):

    """Test updates on one node object"""

    cfg = self._get_object()

    # construct a fake node

    fake_node = objects.Node()

    # fail if we didn't read the config

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_node,

                          None)

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    # first pass, must not fail

    cfg.Update(node, None)

    # second pass, also must not fail (after the config has been written)

    cfg.Update(node, None)

    # but the fake_node update should still fail

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_node,

                          None)

  def testUpdateInstance(self):

    """Test updates on one instance object"""

    cfg = self._get_object()

    # construct a fake instance

    inst = self._create_instance()

    fake_instance = objects.Instance()

    # fail if we didn't read the config

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_instance,

                          None)

    cfg.AddInstance(inst, "my-job")

    instance = cfg.GetInstanceInfo(cfg.GetInstanceList()[0])

    # first pass, must not fail

    cfg.Update(instance, None)

    # second pass, also must not fail (after the config has been written)

    cfg.Update(instance, None)

    # but the fake_instance update should still fail

    self.failUnlessRaises(errors.ConfigurationError, cfg.Update, fake_instance,

                          None)

  def testUpgradeSave(self):

    """Test that any modification done during upgrading is saved back"""

    cfg = self._get_object()

    # Remove an element, run upgrade, and check if the element is

    # back and the file upgraded

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    # For a ConfigObject, None is the same as a missing field

    node.ndparams = None

    oldsaved = utils.ReadFile(self.cfg_file)

    cfg._UpgradeConfig()

    self.assertTrue(node.ndparams is not None)

    newsaved = utils.ReadFile(self.cfg_file)

    # We rely on the fact that at least the serial number changes

    self.assertNotEqual(oldsaved, newsaved)

    # Add something that should not be there this time

    key = list(constants.NDC_GLOBALS)[0]

    node.ndparams[key] = constants.NDC_DEFAULTS[key]

    cfg._WriteConfig(None)

    oldsaved = utils.ReadFile(self.cfg_file)

    cfg._UpgradeConfig()

    self.assertTrue(node.ndparams.get(key) is None)

    newsaved = utils.ReadFile(self.cfg_file)

    self.assertNotEqual(oldsaved, newsaved)

    # Do the upgrade again, this time there should be no update

    oldsaved = newsaved

    cfg._UpgradeConfig()

    newsaved = utils.ReadFile(self.cfg_file)

    self.assertEqual(oldsaved, newsaved)

    # Reload the configuration again: it shouldn't change the file

    oldsaved = newsaved

    self._get_object()

    newsaved = utils.ReadFile(self.cfg_file)

    self.assertEqual(oldsaved, newsaved)

  def testNICParameterSyntaxCheck(self):

    """Test the NIC's CheckParameterSyntax function"""

    mode = constants.NIC_MODE

    link = constants.NIC_LINK

    m_bridged = constants.NIC_MODE_BRIDGED

    m_routed = constants.NIC_MODE_ROUTED

    CheckSyntax = objects.NIC.CheckParameterSyntax

    CheckSyntax(constants.NICC_DEFAULTS)

    CheckSyntax({mode: m_bridged, link: "br1"})

    CheckSyntax({mode: m_routed, link: "default"})

    self.assertRaises(errors.ConfigurationError,

                      CheckSyntax, {mode: "000invalid", link: "any"})

    self.assertRaises(errors.ConfigurationError,

                      CheckSyntax, {mode: m_bridged, link: None})

    self.assertRaises(errors.ConfigurationError,

                      CheckSyntax, {mode: m_bridged, link: ""})

  def testGetNdParamsDefault(self):

    cfg = self._get_object()

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    self.assertEqual(cfg.GetNdParams(node), constants.NDC_DEFAULTS)

  def testGetNdParamsModifiedNode(self):

    my_ndparams = {

        constants.ND_OOB_PROGRAM: "/bin/node-oob",

        constants.ND_SPINDLE_COUNT: 1,

        constants.ND_EXCLUSIVE_STORAGE: False,

        }

    cfg = self._get_object()

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    node.ndparams = my_ndparams

    cfg.Update(node, None)

    self.assertEqual(cfg.GetNdParams(node), my_ndparams)

  def testGetNdParamsInheritance(self):

    node_ndparams = {

      constants.ND_OOB_PROGRAM: "/bin/node-oob",

      }

    group_ndparams = {

      constants.ND_SPINDLE_COUNT: 10,

      }

    expected_ndparams = {

      constants.ND_OOB_PROGRAM: "/bin/node-oob",

      constants.ND_SPINDLE_COUNT: 10,

      constants.ND_EXCLUSIVE_STORAGE:

        constants.NDC_DEFAULTS[constants.ND_EXCLUSIVE_STORAGE],

      }

    cfg = self._get_object()

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    node.ndparams = node_ndparams

    cfg.Update(node, None)

    group = cfg.GetNodeGroup(node.group)

    group.ndparams = group_ndparams

    cfg.Update(group, None)

    self.assertEqual(cfg.GetNdParams(node), expected_ndparams)

  def testAddGroupFillsFieldsIfMissing(self):

    cfg = self._get_object()

    group = objects.NodeGroup(name="test", members=[])

    cfg.AddNodeGroup(group, "my-job")

    self.assert_(utils.UUID_RE.match(group.uuid))

    self.assertEqual(constants.ALLOC_POLICY_PREFERRED, group.alloc_policy)

  def testAddGroupPreservesFields(self):

    cfg = self._get_object()

    group = objects.NodeGroup(name="test", members=[],

                              alloc_policy=constants.ALLOC_POLICY_LAST_RESORT)

    cfg.AddNodeGroup(group, "my-job")

    self.assertEqual(constants.ALLOC_POLICY_LAST_RESORT, group.alloc_policy)

  def testAddGroupDoesNotPreserveFields(self):

    cfg = self._get_object()

    group = objects.NodeGroup(name="test", members=[],

                              serial_no=17, ctime=123, mtime=456)

    cfg.AddNodeGroup(group, "my-job")

    self.assertEqual(1, group.serial_no)

    self.assert_(group.ctime > 1200000000)

    self.assert_(group.mtime > 1200000000)

  def testAddGroupCanSkipUUIDCheck(self):

    cfg = self._get_object()

    uuid = cfg.GenerateUniqueID("my-job")

    group = objects.NodeGroup(name="test", members=[], uuid=uuid,

                              serial_no=17, ctime=123, mtime=456)

    self.assertRaises(errors.ConfigurationError,

                      cfg.AddNodeGroup, group, "my-job")

    cfg.AddNodeGroup(group, "my-job", check_uuid=False) # Does not raise.

    self.assertEqual(uuid, group.uuid)

  def testAssignGroupNodes(self):

    me = netutils.Hostname()

    cfg = self._get_object()

    # Create two groups

    grp1 = objects.NodeGroup(name="grp1", members=[],

                             uuid="2f2fadf7-2a70-4a23-9ab5-2568c252032c")

    grp1_serial = 1

    cfg.AddNodeGroup(grp1, "job")

    grp2 = objects.NodeGroup(name="grp2", members=[],

                             uuid="798d0de3-680f-4a0e-b29a-0f54f693b3f1")

    grp2_serial = 1

    cfg.AddNodeGroup(grp2, "job")

    self.assertEqual(set(map(operator.attrgetter("name"),

                             cfg.GetAllNodeGroupsInfo().values())),

                     set(["grp1", "grp2", constants.INITIAL_NODE_GROUP_NAME]))

    # No-op

    cluster_serial = cfg.GetClusterInfo().serial_no

    cfg.AssignGroupNodes([])

    cluster_serial += 1

    # Create two nodes

    node1 = objects.Node(name="node1", group=grp1.uuid, ndparams={},

                         uuid="node1-uuid")

    node1_serial = 1

    node2 = objects.Node(name="node2", group=grp2.uuid, ndparams={},

                         uuid="node2-uuid")

    node2_serial = 1

    cfg.AddNode(node1, "job")

    cfg.AddNode(node2, "job")

    cluster_serial += 2

    self.assertEqual(set(cfg.GetNodeList()),

                     set(["node1-uuid", "node2-uuid",

                          cfg.GetNodeInfoByName(me.name).uuid]))

    def _VerifySerials():

      self.assertEqual(cfg.GetClusterInfo().serial_no, cluster_serial)

      self.assertEqual(node1.serial_no, node1_serial)

      self.assertEqual(node2.serial_no, node2_serial)

      self.assertEqual(grp1.serial_no, grp1_serial)

      self.assertEqual(grp2.serial_no, grp2_serial)

    _VerifySerials()

    self.assertEqual(set(grp1.members), set(["node1-uuid"]))

    self.assertEqual(set(grp2.members), set(["node2-uuid"]))

    # Check invalid nodes and groups

    self.assertRaises(errors.ConfigurationError, cfg.AssignGroupNodes, [

      ("unknown.node.example.com", grp2.uuid),

      ])

    self.assertRaises(errors.ConfigurationError, cfg.AssignGroupNodes, [

      (node1.name, "unknown-uuid"),

      ])

    self.assertEqual(node1.group, grp1.uuid)

    self.assertEqual(node2.group, grp2.uuid)

    self.assertEqual(set(grp1.members), set(["node1-uuid"]))

    self.assertEqual(set(grp2.members), set(["node2-uuid"]))

    # Another no-op

    cfg.AssignGroupNodes([])

    cluster_serial += 1

    _VerifySerials()

    # Assign to the same group (should be a no-op)

    self.assertEqual(node2.group, grp2.uuid)

    cfg.AssignGroupNodes([

      (node2.uuid, grp2.uuid),

      ])

    cluster_serial += 1

    self.assertEqual(node2.group, grp2.uuid)

    _VerifySerials()

    self.assertEqual(set(grp1.members), set(["node1-uuid"]))

    self.assertEqual(set(grp2.members), set(["node2-uuid"]))

    # Assign node 2 to group 1

    self.assertEqual(node2.group, grp2.uuid)

    cfg.AssignGroupNodes([

      (node2.uuid, grp1.uuid),

      ])

    cluster_serial += 1

    node2_serial += 1

    grp1_serial += 1

    grp2_serial += 1

    self.assertEqual(node2.group, grp1.uuid)

    _VerifySerials()

    self.assertEqual(set(grp1.members), set(["node1-uuid", "node2-uuid"]))

    self.assertFalse(grp2.members)

    # And assign both nodes to group 2

    self.assertEqual(node1.group, grp1.uuid)

    self.assertEqual(node2.group, grp1.uuid)

    self.assertNotEqual(grp1.uuid, grp2.uuid)

    cfg.AssignGroupNodes([

      (node1.uuid, grp2.uuid),

      (node2.uuid, grp2.uuid),

      ])

    cluster_serial += 1

    node1_serial += 1

    node2_serial += 1

    grp1_serial += 1

    grp2_serial += 1

    self.assertEqual(node1.group, grp2.uuid)

    self.assertEqual(node2.group, grp2.uuid)

    _VerifySerials()

    self.assertFalse(grp1.members)

    self.assertEqual(set(grp2.members), set(["node1-uuid", "node2-uuid"]))

    # Destructive tests

    orig_group = node2.group

    try:

      other_uuid = "68b3d087-6ea5-491c-b81f-0a47d90228c5"

      assert compat.all(node.group != other_uuid

                        for node in cfg.GetAllNodesInfo().values())

      node2.group = "68b3d087-6ea5-491c-b81f-0a47d90228c5"

      self.assertRaises(errors.ConfigurationError, cfg.AssignGroupNodes, [

        (node2.uuid, grp2.uuid),

        ])

      _VerifySerials()

    finally:

      node2.group = orig_group

  def _TestVerifyConfigIPolicy(self, ipolicy, ipowner, cfg, isgroup):

    INVALID_KEY = "this_key_cannot_exist"

    ipolicy[INVALID_KEY] = None

    # A call to cluster.SimpleFillIPolicy causes different kinds of error

    # depending on the owner (cluster or group)

    if isgroup:

      errs = cfg.VerifyConfig()

      self.assertTrue(len(errs) >= 1)

      errstr = "%s has invalid instance policy" % ipowner

      self.assertTrue(_IsErrorInList(errstr, errs))

    else:

      self.assertRaises(AssertionError, cfg.VerifyConfig)

    del ipolicy[INVALID_KEY]

    errs = cfg.VerifyConfig()

    self.assertFalse(errs)

    key = list(constants.IPOLICY_PARAMETERS)[0]

    hasoldv = (key in ipolicy)

    if hasoldv:

      oldv = ipolicy[key]

    ipolicy[key] = "blah"

    errs = cfg.VerifyConfig()

    self.assertTrue(len(errs) >= 1)

    self.assertTrue(_IsErrorInList("%s has invalid instance policy" % ipowner,

                                   errs))

    if hasoldv:

      ipolicy[key] = oldv

    else:

      del ipolicy[key]

    ispeclist = []

    if constants.ISPECS_MINMAX in ipolicy:

      for k in range(len(ipolicy[constants.ISPECS_MINMAX])):

        ispeclist.extend([

            (ipolicy[constants.ISPECS_MINMAX][k][constants.ISPECS_MIN],

             "%s[%s]/%s" % (constants.ISPECS_MINMAX, k, constants.ISPECS_MIN)),

            (ipolicy[constants.ISPECS_MINMAX][k][constants.ISPECS_MAX],

             "%s[%s]/%s" % (constants.ISPECS_MINMAX, k, constants.ISPECS_MAX)),

            ])

    if constants.ISPECS_STD in ipolicy:

      ispeclist.append((ipolicy[constants.ISPECS_STD], constants.ISPECS_STD))

    for (ispec, ispecpath) in ispeclist:

      ispec[INVALID_KEY] = None

      errs = cfg.VerifyConfig()

      self.assertTrue(len(errs) >= 1)

      self.assertTrue(_IsErrorInList(("%s has invalid ipolicy/%s" %

                                      (ipowner, ispecpath)), errs))

      del ispec[INVALID_KEY]

      errs = cfg.VerifyConfig()

      self.assertFalse(errs)

      for par in constants.ISPECS_PARAMETERS:

        hasoldv = par in ispec

        if hasoldv:

          oldv = ispec[par]

        ispec[par] = "blah"

        errs = cfg.VerifyConfig()

        self.assertTrue(len(errs) >= 1)

        self.assertTrue(_IsErrorInList(("%s has invalid ipolicy/%s" %

                                        (ipowner, ispecpath)), errs))

        if hasoldv:

          ispec[par] = oldv

        else:

          del ispec[par]

        errs = cfg.VerifyConfig()

        self.assertFalse(errs)

    if constants.ISPECS_MINMAX in ipolicy:

      # Test partial minmax specs

      for minmax in ipolicy[constants.ISPECS_MINMAX]:

        for key in constants.ISPECS_MINMAX_KEYS:

          self.assertTrue(key in minmax)

          ispec = minmax[key]

          del minmax[key]

          errs = cfg.VerifyConfig()

          self.assertTrue(len(errs) >= 1)

          self.assertTrue(_IsErrorInList("Missing instance specification",

                                         errs))

          minmax[key] = ispec

          for par in constants.ISPECS_PARAMETERS:

            oldv = ispec[par]

            del ispec[par]

            errs = cfg.VerifyConfig()

            self.assertTrue(len(errs) >= 1)

            self.assertTrue(_IsErrorInList("Missing instance specs parameters",

                                           errs))

            ispec[par] = oldv

      errs = cfg.VerifyConfig()

      self.assertFalse(errs)

  def _TestVerifyConfigGroupIPolicy(self, groupinfo, cfg):

    old_ipolicy = groupinfo.ipolicy

    ipolicy = cfg.GetClusterInfo().SimpleFillIPolicy({})

    groupinfo.ipolicy = ipolicy

    # Test partial policies

    for key in constants.IPOLICY_ALL_KEYS:

      self.assertTrue(key in ipolicy)

      oldv = ipolicy[key]

      del ipolicy[key]

      errs = cfg.VerifyConfig()

      self.assertFalse(errs)

      ipolicy[key] = oldv

    groupinfo.ipolicy = old_ipolicy

  def _TestVerifyConfigClusterIPolicy(self, ipolicy, cfg):

    # Test partial policies

    for key in constants.IPOLICY_ALL_KEYS:

      self.assertTrue(key in ipolicy)

      oldv = ipolicy[key]

      del ipolicy[key]

      self.assertRaises(AssertionError, cfg.VerifyConfig)

      ipolicy[key] = oldv

    errs = cfg.VerifyConfig()

    self.assertFalse(errs)

    # Partial standard specs

    ispec = ipolicy[constants.ISPECS_STD]

    for par in constants.ISPECS_PARAMETERS:

      oldv = ispec[par]

      del ispec[par]

      errs = cfg.VerifyConfig()

      self.assertTrue(len(errs) >= 1)

      self.assertTrue(_IsErrorInList("Missing instance specs parameters",

                                     errs))

      ispec[par] = oldv

    errs = cfg.VerifyConfig()

    self.assertFalse(errs)

  def testVerifyConfig(self):

    cfg = self._get_object()

    errs = cfg.VerifyConfig()

    self.assertFalse(errs)

    node = cfg.GetNodeInfo(cfg.GetNodeList()[0])

    key = list(constants.NDC_GLOBALS)[0]

    node.ndparams[key] = constants.NDC_DEFAULTS[key]

    errs = cfg.VerifyConfig()

    self.assertTrue(len(errs) >= 1)

    self.assertTrue(_IsErrorInList("has some global parameters set", errs))

    del node.ndparams[key]

    errs = cfg.VerifyConfig()

    self.assertFalse(errs)

    cluster = cfg.GetClusterInfo()

    nodegroup = cfg.GetNodeGroup(cfg.GetNodeGroupList()[0])

    self._TestVerifyConfigIPolicy(cluster.ipolicy, "cluster", cfg, False)

    self._TestVerifyConfigClusterIPolicy(cluster.ipolicy, cfg)

    self._TestVerifyConfigIPolicy(nodegroup.ipolicy, nodegroup.name, cfg, True)

    self._TestVerifyConfigGroupIPolicy(nodegroup, cfg)

    nodegroup.ipolicy = cluster.SimpleFillIPolicy(nodegroup.ipolicy)

    self._TestVerifyConfigIPolicy(nodegroup.ipolicy, nodegroup.name, cfg, True)

  # Tests for Ssconf helper functions

  def testUnlockedGetHvparamsString(self):

    hvparams = {"a": "A", "b": "B", "c": "C"}

    hvname = "myhv"

    cfg_writer = self._get_object()

    cfg_writer._config_data = mock.Mock()

    cfg_writer._config_data.cluster = mock.Mock()

    cfg_writer._config_data.cluster.hvparams = {hvname: hvparams}

    result = cfg_writer._UnlockedGetHvparamsString(hvname)

    self.assertTrue("a=A" in result)

    lines = [line for line in result.split('\n') if line != '']

    self.assertEqual(len(hvparams.keys()), len(lines))

  def testExtendByAllHvparamsStrings(self):

    all_hvparams = {constants.HT_XEN_PVM: "foo"}

    ssconf_values = {}

    cfg_writer = self._get_object()

    cfg_writer._ExtendByAllHvparamsStrings(ssconf_values, all_hvparams)

    expected_key = constants.SS_HVPARAMS_PREF + constants.HT_XEN_PVM

    self.assertTrue(expected_key in ssconf_values)

def _IsErrorInList(err_str, err_list):

  return any(map(lambda e: err_str in e, err_list))

class TestTRM(unittest.TestCase):

  EC_ID = 1

  def testEmpty(self):

    t = TemporaryReservationManager()

    t.Reserve(self.EC_ID, "a")

    self.assertFalse(t.Reserved(self.EC_ID))

    self.assertTrue(t.Reserved("a"))

    self.assertEqual(len(t.GetReserved()), 1)

  def testDuplicate(self):

    t = TemporaryReservationManager()

    t.Reserve(self.EC_ID, "a")

    self.assertRaises(errors.ReservationError, t.Reserve, 2, "a")

    t.DropECReservations(self.EC_ID)

    self.assertFalse(t.Reserved("a"))

class TestCheckInstanceDiskIvNames(unittest.TestCase):

  @staticmethod

  def _MakeDisks(names):

    return [objects.Disk(iv_name=name) for name in names]

  def testNoError(self):

    disks = self._MakeDisks(["disk/0", "disk/1"])

    self.assertEqual(config._CheckInstanceDiskIvNames(disks), [])

    instance._UpdateIvNames(0, disks)

    self.assertEqual(config._CheckInstanceDiskIvNames(disks), [])

  def testWrongNames(self):

    disks = self._MakeDisks(["disk/1", "disk/3", "disk/2"])

    self.assertEqual(config._CheckInstanceDiskIvNames(disks), [

      (0, "disk/0", "disk/1"),

      (1, "disk/1", "disk/3"),

      ])

    # Fix names

    instance._UpdateIvNames(0, disks)

    self.assertEqual(config._CheckInstanceDiskIvNames(disks), [])

if __name__ == "__main__":

  testutils.GanetiTestProgram()