Synnefo » snf-ganeti

#!/usr/bin/python -u

#

# Copyright (C) 2007, 2008, 2009, 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.

#

# 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 doing QA on Ganeti.

"""

# pylint: disable=C0103

# due to invalid name

import copy

import datetime

import optparse

import sys

import colors

import qa_cluster

import qa_config

import qa_daemon

import qa_env

import qa_error

import qa_group

import qa_instance

import qa_iptables

import qa_monitoring

import qa_network

import qa_node

import qa_os

import qa_job

import qa_rapi

import qa_tags

import qa_utils

from ganeti import utils

from ganeti import rapi # pylint: disable=W0611

from ganeti import constants

from ganeti import netutils

import ganeti.rapi.client # pylint: disable=W0611

from ganeti.rapi.client import UsesRapiClient

def _FormatHeader(line, end=72, mark="-", color=None):

  """Fill a line up to the end column.

  """

  line = (mark * 4) + " " + line + " "

  line += "-" * (end - len(line))

  line = line.rstrip()

  line = colors.colorize(line, color=color)

  return line

def _DescriptionOf(fn):

  """Computes the description of an item.

  """

  if fn.__doc__:

    desc = fn.__doc__.splitlines()[0].strip()

    desc = desc.rstrip(".")

    if fn.__name__:

      desc = "[" + fn.__name__ + "] " + desc

  else:

    desc = "%r" % fn

  return desc

def RunTest(fn, *args, **kwargs):

  """Runs a test after printing a header.

  """

  tstart = datetime.datetime.now()

  desc = _DescriptionOf(fn)

  print

  print _FormatHeader("%s start %s" % (tstart, desc),

                      color=colors.YELLOW, mark="<")

  try:

    retval = fn(*args, **kwargs)

    print _FormatHeader("PASSED %s" % (desc, ), color=colors.GREEN)

    return retval

  except Exception, e:

    print _FormatHeader("FAILED %s: %s" % (desc, e), color=colors.RED)

    raise

  finally:

    tstop = datetime.datetime.now()

    tdelta = tstop - tstart

    print _FormatHeader("%s time=%s %s" % (tstop, tdelta, desc),

                        color=colors.MAGENTA, mark=">")

def RunTestIf(testnames, fn, *args, **kwargs):

  """Runs a test conditionally.

  @param testnames: either a single test name in the configuration

      file, or a list of testnames (which will be AND-ed together)

  """

  if qa_config.TestEnabled(testnames):

    RunTest(fn, *args, **kwargs)

  else:

    tstart = datetime.datetime.now()

    desc = _DescriptionOf(fn)

    # TODO: Formatting test names when non-string names are involved

    print _FormatHeader("%s skipping %s, test(s) %s disabled" %

                        (tstart, desc, testnames),

                        color=colors.BLUE, mark="*")

def RunTestBlock(fn, *args, **kwargs):

  """Runs a block of tests after printing a header.

  """

  tstart = datetime.datetime.now()

  desc = _DescriptionOf(fn)

  print

  print _FormatHeader("BLOCK %s start %s" % (tstart, desc),

                      color=[colors.YELLOW, colors.BOLD], mark="v")

  try:

    return fn(*args, **kwargs)

  except Exception, e:

    print _FormatHeader("BLOCK FAILED %s: %s" % (desc, e),

                        color=[colors.RED, colors.BOLD])

    raise

  finally:

    tstop = datetime.datetime.now()

    tdelta = tstop - tstart

    print _FormatHeader("BLOCK %s time=%s %s" % (tstop, tdelta, desc),

                        color=[colors.MAGENTA, colors.BOLD], mark="^")

def RunEnvTests():

  """Run several environment tests.

  """

  RunTestIf("env", qa_env.TestSshConnection)

  RunTestIf("env", qa_env.TestIcmpPing)

  RunTestIf("env", qa_env.TestGanetiCommands)

def SetupCluster(rapi_user):

  """Initializes the cluster.

  @param rapi_user: Login user for RAPI

  @return: Login secret for RAPI

  """

  rapi_secret = utils.GenerateSecret()

  RunTestIf("create-cluster", qa_cluster.TestClusterInit,

            rapi_user, rapi_secret)

  if not qa_config.TestEnabled("create-cluster"):

    # If the cluster is already in place, we assume that exclusive-storage is

    # already set according to the configuration

    qa_config.SetExclusiveStorage(qa_config.get("exclusive-storage", False))

    if qa_rapi.Enabled():

      # To support RAPI on an existing cluster we have to find out the secret

      rapi_secret = qa_rapi.LookupRapiSecret(rapi_user)

  qa_group.ConfigureGroups()

  # Test on empty cluster

  RunTestIf("node-list", qa_node.TestNodeList)

  RunTestIf("instance-list", qa_instance.TestInstanceList)

  RunTestIf("job-list", qa_job.TestJobList)

  RunTestIf("create-cluster", qa_node.TestNodeAddAll)

  if not qa_config.TestEnabled("create-cluster"):

    # consider the nodes are already there

    qa_node.MarkNodeAddedAll()

  RunTestIf("test-jobqueue", qa_cluster.TestJobqueue)

  # enable the watcher (unconditionally)

  RunTest(qa_daemon.TestResumeWatcher)

  RunTestIf("node-list", qa_node.TestNodeList)

  # Test listing fields

  RunTestIf("node-list", qa_node.TestNodeListFields)

  RunTestIf("instance-list", qa_instance.TestInstanceListFields)

  RunTestIf("job-list", qa_job.TestJobListFields)

  RunTestIf("instance-export", qa_instance.TestBackupListFields)

  RunTestIf("node-info", qa_node.TestNodeInfo)

  return rapi_secret

def RunClusterTests():

  """Runs tests related to gnt-cluster.

  """

  for test, fn in [

    ("create-cluster", qa_cluster.TestClusterInitDisk),

    ("cluster-renew-crypto", qa_cluster.TestClusterRenewCrypto),

    ("cluster-verify", qa_cluster.TestClusterVerify),

    ("cluster-reserved-lvs", qa_cluster.TestClusterReservedLvs),

    # TODO: add more cluster modify tests

    ("cluster-modify", qa_cluster.TestClusterModifyEmpty),

    ("cluster-modify", qa_cluster.TestClusterModifyIPolicy),

    ("cluster-modify", qa_cluster.TestClusterModifyISpecs),

    ("cluster-modify", qa_cluster.TestClusterModifyBe),

    ("cluster-modify", qa_cluster.TestClusterModifyDisk),

    ("cluster-modify", qa_cluster.TestClusterModifyDiskTemplates),

    ("cluster-modify", qa_cluster.TestClusterModifyFileStorageDir),

    ("cluster-modify", qa_cluster.TestClusterModifySharedFileStorageDir),

    ("cluster-rename", qa_cluster.TestClusterRename),

    ("cluster-info", qa_cluster.TestClusterVersion),

    ("cluster-info", qa_cluster.TestClusterInfo),

    ("cluster-info", qa_cluster.TestClusterGetmaster),

    ("cluster-redist-conf", qa_cluster.TestClusterRedistConf),

    (["cluster-copyfile", qa_config.NoVirtualCluster],

     qa_cluster.TestClusterCopyfile),

    ("cluster-command", qa_cluster.TestClusterCommand),

    ("cluster-burnin", qa_cluster.TestClusterBurnin),

    ("cluster-master-failover", qa_cluster.TestClusterMasterFailover),

    ("cluster-master-failover",

     qa_cluster.TestClusterMasterFailoverWithDrainedQueue),

    (["cluster-oob", qa_config.NoVirtualCluster],

     qa_cluster.TestClusterOob),

    (qa_rapi.Enabled, qa_rapi.TestVersion),

    (qa_rapi.Enabled, qa_rapi.TestEmptyCluster),

    (qa_rapi.Enabled, qa_rapi.TestRapiQuery),

    ]:

    RunTestIf(test, fn)

def RunRepairDiskSizes():

  """Run the repair disk-sizes test.

  """

  RunTestIf("cluster-repair-disk-sizes", qa_cluster.TestClusterRepairDiskSizes)

def RunOsTests():

  """Runs all tests related to gnt-os.

  """

  os_enabled = ["os", qa_config.NoVirtualCluster]

  if qa_config.TestEnabled(qa_rapi.Enabled):

    rapi_getos = qa_rapi.GetOperatingSystems

  else:

    rapi_getos = None

  for fn in [

    qa_os.TestOsList,

    qa_os.TestOsDiagnose,

    ]:

    RunTestIf(os_enabled, fn)

  for fn in [

    qa_os.TestOsValid,

    qa_os.TestOsInvalid,

    qa_os.TestOsPartiallyValid,

    ]:

    RunTestIf(os_enabled, fn, rapi_getos)

  for fn in [

    qa_os.TestOsModifyValid,

    qa_os.TestOsModifyInvalid,

    qa_os.TestOsStatesNonExisting,

    ]:

    RunTestIf(os_enabled, fn)

def RunCommonInstanceTests(instance, inst_nodes):

  """Runs a few tests that are common to all disk types.

  """

  RunTestIf("instance-shutdown", qa_instance.TestInstanceShutdown, instance)

  RunTestIf(["instance-shutdown", "instance-console", qa_rapi.Enabled],

            qa_rapi.TestRapiStoppedInstanceConsole, instance)

  RunTestIf(["instance-shutdown", "instance-modify"],

            qa_instance.TestInstanceStoppedModify, instance)

  RunTestIf("instance-shutdown", qa_instance.TestInstanceStartup, instance)

  # Test shutdown/start via RAPI

  RunTestIf(["instance-shutdown", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceShutdown, instance)

  RunTestIf(["instance-shutdown", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceStartup, instance)

  RunTestIf("instance-list", qa_instance.TestInstanceList)

  RunTestIf("instance-info", qa_instance.TestInstanceInfo, instance)

  RunTestIf("instance-modify", qa_instance.TestInstanceModify, instance)

  RunTestIf(["instance-modify", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceModify, instance)

  RunTestIf("instance-console", qa_instance.TestInstanceConsole, instance)

  RunTestIf(["instance-console", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceConsole, instance)

  RunTestIf("instance-device-names", qa_instance.TestInstanceDeviceNames,

            instance)

  DOWN_TESTS = qa_config.Either([

    "instance-reinstall",

    "instance-rename",

    "instance-grow-disk",

    ])

  # shutdown instance for any 'down' tests

  RunTestIf(DOWN_TESTS, qa_instance.TestInstanceShutdown, instance)

  # now run the 'down' state tests

  RunTestIf("instance-reinstall", qa_instance.TestInstanceReinstall, instance)

  RunTestIf(["instance-reinstall", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceReinstall, instance)

  if qa_config.TestEnabled("instance-rename"):

    tgt_instance = qa_config.AcquireInstance()

    try:

      rename_source = instance.name

      rename_target = tgt_instance.name

      # perform instance rename to the same name

      RunTest(qa_instance.TestInstanceRenameAndBack,

              rename_source, rename_source)

      RunTestIf(qa_rapi.Enabled, qa_rapi.TestRapiInstanceRenameAndBack,

                rename_source, rename_source)

      if rename_target is not None:

        # perform instance rename to a different name, if we have one configured

        RunTest(qa_instance.TestInstanceRenameAndBack,

                rename_source, rename_target)

        RunTestIf(qa_rapi.Enabled, qa_rapi.TestRapiInstanceRenameAndBack,

                  rename_source, rename_target)

    finally:

      tgt_instance.Release()

  RunTestIf(["instance-grow-disk"], qa_instance.TestInstanceGrowDisk, instance)

  # and now start the instance again

  RunTestIf(DOWN_TESTS, qa_instance.TestInstanceStartup, instance)

  RunTestIf("instance-reboot", qa_instance.TestInstanceReboot, instance)

  RunTestIf("tags", qa_tags.TestInstanceTags, instance)

  if instance.disk_template == constants.DT_DRBD8:

    RunTestIf("cluster-verify",

              qa_cluster.TestClusterVerifyDisksBrokenDRBD, instance, inst_nodes)

  RunTestIf("cluster-verify", qa_cluster.TestClusterVerify)

  RunTestIf(qa_rapi.Enabled, qa_rapi.TestInstance, instance)

  # Lists instances, too

  RunTestIf("node-list", qa_node.TestNodeList)

  # Some jobs have been run, let's test listing them

  RunTestIf("job-list", qa_job.TestJobList)

def RunCommonNodeTests():

  """Run a few common node tests.

  """

  RunTestIf("node-volumes", qa_node.TestNodeVolumes)

  RunTestIf("node-storage", qa_node.TestNodeStorage)

  RunTestIf(["node-oob", qa_config.NoVirtualCluster], qa_node.TestOutOfBand)

def RunGroupListTests():

  """Run tests for listing node groups.

  """

  RunTestIf("group-list", qa_group.TestGroupList)

  RunTestIf("group-list", qa_group.TestGroupListFields)

def RunNetworkTests():

  """Run tests for network management.

  """

  RunTestIf("network", qa_network.TestNetworkAddRemove)

  RunTestIf("network", qa_network.TestNetworkConnect)

def RunGroupRwTests():

  """Run tests for adding/removing/renaming groups.

  """

  RunTestIf("group-rwops", qa_group.TestGroupAddRemoveRename)

  RunTestIf("group-rwops", qa_group.TestGroupAddWithOptions)

  RunTestIf("group-rwops", qa_group.TestGroupModify)

  RunTestIf(["group-rwops", qa_rapi.Enabled], qa_rapi.TestRapiNodeGroups)

  RunTestIf(["group-rwops", "tags"], qa_tags.TestGroupTags,

            qa_group.GetDefaultGroup())

def RunExportImportTests(instance, inodes):

  """Tries to export and import the instance.

  @type inodes: list of nodes

  @param inodes: current nodes of the instance

  """

  # FIXME: export explicitly bails out on file based storage. other non-lvm

  # based storage types are untested, though. Also note that import could still

  # work, but is deeply embedded into the "export" case.

  if (qa_config.TestEnabled("instance-export") and

      instance.disk_template not in constants.DTS_FILEBASED):

    RunTest(qa_instance.TestInstanceExportNoTarget, instance)

    pnode = inodes[0]

    expnode = qa_config.AcquireNode(exclude=pnode)

    try:

      name = RunTest(qa_instance.TestInstanceExport, instance, expnode)

      RunTest(qa_instance.TestBackupList, expnode)

      if qa_config.TestEnabled("instance-import"):

        newinst = qa_config.AcquireInstance()

        try:

          RunTest(qa_instance.TestInstanceImport, newinst, pnode,

                  expnode, name)

          # Check if starting the instance works

          RunTest(qa_instance.TestInstanceStartup, newinst)

          RunTest(qa_instance.TestInstanceRemove, newinst)

        finally:

          newinst.Release()

    finally:

      expnode.Release()

  # FIXME: inter-cluster-instance-move crashes on file based instances :/

  # See Issue 414.

  if (qa_config.TestEnabled([qa_rapi.Enabled, "inter-cluster-instance-move"])

      and (instance.disk_template not in constants.DTS_FILEBASED)):

    newinst = qa_config.AcquireInstance()

    try:

      tnode = qa_config.AcquireNode(exclude=inodes)

      try:

        RunTest(qa_rapi.TestInterClusterInstanceMove, instance, newinst,

                inodes, tnode)

      finally:

        tnode.Release()

    finally:

      newinst.Release()

def RunDaemonTests(instance):

  """Test the ganeti-watcher script.

  """

  RunTest(qa_daemon.TestPauseWatcher)

  RunTestIf("instance-automatic-restart",

            qa_daemon.TestInstanceAutomaticRestart, instance)

  RunTestIf("instance-consecutive-failures",

            qa_daemon.TestInstanceConsecutiveFailures, instance)

  RunTest(qa_daemon.TestResumeWatcher)

def RunHardwareFailureTests(instance, inodes):

  """Test cluster internal hardware failure recovery.

  """

  RunTestIf("instance-failover", qa_instance.TestInstanceFailover, instance)

  RunTestIf(["instance-failover", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceFailover, instance)

  RunTestIf("instance-migrate", qa_instance.TestInstanceMigrate, instance)

  RunTestIf(["instance-migrate", qa_rapi.Enabled],

            qa_rapi.TestRapiInstanceMigrate, instance)

  if qa_config.TestEnabled("instance-replace-disks"):

    # We just need alternative secondary nodes, hence "- 1"

    othernodes = qa_config.AcquireManyNodes(len(inodes) - 1, exclude=inodes)

    try:

      RunTestIf(qa_rapi.Enabled, qa_rapi.TestRapiInstanceReplaceDisks, instance)

      RunTest(qa_instance.TestReplaceDisks,

              instance, inodes, othernodes)

    finally:

      qa_config.ReleaseManyNodes(othernodes)

    del othernodes

  if qa_config.TestEnabled("instance-recreate-disks"):

    try:

      acquirednodes = qa_config.AcquireManyNodes(len(inodes), exclude=inodes)

      othernodes = acquirednodes

    except qa_error.OutOfNodesError:

      if len(inodes) > 1:

        # If the cluster is not big enough, let's reuse some of the nodes, but

        # with different roles. In this way, we can test a DRBD instance even on

        # a 3-node cluster.

        acquirednodes = [qa_config.AcquireNode(exclude=inodes)]

        othernodes = acquirednodes + inodes[:-1]

      else:

        raise

    try:

      RunTest(qa_instance.TestRecreateDisks,

              instance, inodes, othernodes)

    finally:

      qa_config.ReleaseManyNodes(acquirednodes)

  if len(inodes) >= 2:

    RunTestIf("node-evacuate", qa_node.TestNodeEvacuate, inodes[0], inodes[1])

    RunTestIf("node-failover", qa_node.TestNodeFailover, inodes[0], inodes[1])

    RunTestIf("node-migrate", qa_node.TestNodeMigrate, inodes[0], inodes[1])

def RunExclusiveStorageTests():

  """Test exclusive storage."""

  if not qa_config.TestEnabled("cluster-exclusive-storage"):

    return

  node = qa_config.AcquireNode()

  try:

    old_es = qa_cluster.TestSetExclStorCluster(False)

    qa_node.TestExclStorSingleNode(node)

    qa_cluster.TestSetExclStorCluster(True)

    qa_cluster.TestExclStorSharedPv(node)

    if qa_config.TestEnabled("instance-add-plain-disk"):

      # Make sure that the cluster doesn't have any pre-existing problem

      qa_cluster.AssertClusterVerify()

      # Create and allocate instances

      instance1 = qa_instance.TestInstanceAddWithPlainDisk([node])

      try:

        instance2 = qa_instance.TestInstanceAddWithPlainDisk([node])

        try:

          # cluster-verify checks that disks are allocated correctly

          qa_cluster.AssertClusterVerify()

          # Remove instances

          qa_instance.TestInstanceRemove(instance2)

          qa_instance.TestInstanceRemove(instance1)

        finally:

          instance2.Release()

      finally:

        instance1.Release()

    if qa_config.TestEnabled("instance-add-drbd-disk"):

      snode = qa_config.AcquireNode()

      try:

        qa_cluster.TestSetExclStorCluster(False)

        instance = qa_instance.TestInstanceAddWithDrbdDisk([node, snode])

        try:

          qa_cluster.TestSetExclStorCluster(True)

          exp_err = [constants.CV_EINSTANCEUNSUITABLENODE]

          qa_cluster.AssertClusterVerify(fail=True, errors=exp_err)

          qa_instance.TestInstanceRemove(instance)

        finally:

          instance.Release()

      finally:

        snode.Release()

    qa_cluster.TestSetExclStorCluster(old_es)

  finally:

    node.Release()

def RunCustomSshPortTests():

  """Test accessing nodes with custom SSH ports.

  This requires removing nodes, adding them to a new group, and then undoing

  the change.

  """

  if not qa_config.TestEnabled("group-custom-ssh-port"):

    return

  std_port = netutils.GetDaemonPort(constants.SSH)

  port = 211

  master = qa_config.GetMasterNode()

  with qa_config.AcquireManyNodesCtx(1, exclude=master) as nodes:

    # Checks if the node(s) could be contacted through IPv6.

    # If yes, better skip the whole test.

    for node in nodes:

      if qa_utils.UsesIPv6Connection(node.primary, std_port):

        print ("Node %s is likely to be reached using IPv6,"

               "skipping the test" % (node.primary, ))

        return

    for node in nodes:

      qa_node.NodeRemove(node)

    with qa_iptables.RulesContext(nodes) as r:

      with qa_group.NewGroupCtx() as group:

        qa_group.ModifyGroupSshPort(r, group, nodes, port)

        for node in nodes:

          qa_node.NodeAdd(node, group=group)

        # Make sure that the cluster doesn't have any pre-existing problem

        qa_cluster.AssertClusterVerify()

        # Create and allocate instances

        instance1 = qa_instance.TestInstanceAddWithPlainDisk(nodes)

        try:

          instance2 = qa_instance.TestInstanceAddWithPlainDisk(nodes)

          try:

            # cluster-verify checks that disks are allocated correctly

            qa_cluster.AssertClusterVerify()

            # Remove instances

            qa_instance.TestInstanceRemove(instance2)

            qa_instance.TestInstanceRemove(instance1)

          finally:

            instance2.Release()

        finally:

          instance1.Release()

        for node in nodes:

          qa_node.NodeRemove(node)

    for node in nodes:

      qa_node.NodeAdd(node)

    qa_cluster.AssertClusterVerify()

def _BuildSpecDict(par, mn, st, mx):

  return {

    constants.ISPECS_MINMAX: [{

      constants.ISPECS_MIN: {par: mn},

      constants.ISPECS_MAX: {par: mx},

      }],

    constants.ISPECS_STD: {par: st},

    }

def _BuildDoubleSpecDict(index, par, mn, st, mx):

  new_spec = {

    constants.ISPECS_MINMAX: [{}, {}],

    }

  if st is not None:

    new_spec[constants.ISPECS_STD] = {par: st}

  new_spec[constants.ISPECS_MINMAX][index] = {

    constants.ISPECS_MIN: {par: mn},

    constants.ISPECS_MAX: {par: mx},

    }

  return new_spec

def TestIPolicyPlainInstance():

  """Test instance policy interaction with instances"""

  params = ["memory-size", "cpu-count", "disk-count", "disk-size", "nic-count"]

  if not qa_config.IsTemplateSupported(constants.DT_PLAIN):

    print "Template %s not supported" % constants.DT_PLAIN

    return

  # This test assumes that the group policy is empty

  (_, old_specs) = qa_cluster.TestClusterSetISpecs()

  # We also assume to have only one min/max bound

  assert len(old_specs[constants.ISPECS_MINMAX]) == 1

  node = qa_config.AcquireNode()

  try:

    # Log of policy changes, list of tuples:

    # (full_change, incremental_change, policy_violated)

    history = []

    instance = qa_instance.TestInstanceAddWithPlainDisk([node])

    try:

      policyerror = [constants.CV_EINSTANCEPOLICY]

      for par in params:

        (iminval, imaxval) = qa_instance.GetInstanceSpec(instance.name, par)

        # Some specs must be multiple of 4

        new_spec = _BuildSpecDict(par, imaxval + 4, imaxval + 4, imaxval + 4)

        history.append((None, new_spec, True))

        if iminval > 0:

          # Some specs must be multiple of 4

          if iminval >= 4:

            upper = iminval - 4

          else:

            upper = iminval - 1

          new_spec = _BuildSpecDict(par, 0, upper, upper)

          history.append((None, new_spec, True))

        history.append((old_specs, None, False))

      # Test with two instance specs

      double_specs = copy.deepcopy(old_specs)

      double_specs[constants.ISPECS_MINMAX] = \

          double_specs[constants.ISPECS_MINMAX] * 2

      (par1, par2) = params[0:2]

      (_, imaxval1) = qa_instance.GetInstanceSpec(instance.name, par1)

      (_, imaxval2) = qa_instance.GetInstanceSpec(instance.name, par2)

      old_minmax = old_specs[constants.ISPECS_MINMAX][0]

      history.extend([

        (double_specs, None, False),

        # The first min/max limit is being violated

        (None,

         _BuildDoubleSpecDict(0, par1, imaxval1 + 4, imaxval1 + 4,

                              imaxval1 + 4),

         False),

        # Both min/max limits are being violated

        (None,

         _BuildDoubleSpecDict(1, par2, imaxval2 + 4, None, imaxval2 + 4),

         True),

        # The second min/max limit is being violated

        (None,

         _BuildDoubleSpecDict(0, par1,

                              old_minmax[constants.ISPECS_MIN][par1],

                              old_specs[constants.ISPECS_STD][par1],

                              old_minmax[constants.ISPECS_MAX][par1]),

         False),

        (old_specs, None, False),

        ])

      # Apply the changes, and check policy violations after each change

      qa_cluster.AssertClusterVerify()

      for (new_specs, diff_specs, failed) in history:

        qa_cluster.TestClusterSetISpecs(new_specs=new_specs,

                                        diff_specs=diff_specs)

        if failed:

          qa_cluster.AssertClusterVerify(warnings=policyerror)

        else:

          qa_cluster.AssertClusterVerify()

      qa_instance.TestInstanceRemove(instance)

    finally:

      instance.Release()

    # Now we replay the same policy changes, and we expect that the instance

    # cannot be created for the cases where we had a policy violation above

    for (new_specs, diff_specs, failed) in history:

      qa_cluster.TestClusterSetISpecs(new_specs=new_specs,

                                      diff_specs=diff_specs)

      if failed:

        qa_instance.TestInstanceAddWithPlainDisk([node], fail=True)

      # Instance creation with no policy violation has been tested already

  finally:

    node.Release()

def IsExclusiveStorageInstanceTestEnabled():

  test_name = "exclusive-storage-instance-tests"

  if qa_config.TestEnabled(test_name):

    vgname = qa_config.get("vg-name", constants.DEFAULT_VG)

    vgscmd = utils.ShellQuoteArgs([

      "vgs", "--noheadings", "-o", "pv_count", vgname,

      ])

    nodes = qa_config.GetConfig()["nodes"]

    for node in nodes:

      try:

        pvnum = int(qa_utils.GetCommandOutput(node.primary, vgscmd))

      except Exception, e:

        msg = ("Cannot get the number of PVs on %s, needed by '%s': %s" %

               (node.primary, test_name, e))

        raise qa_error.Error(msg)

      if pvnum < 2:

        raise qa_error.Error("Node %s has not enough PVs (%s) to run '%s'" %

                             (node.primary, pvnum, test_name))

    res = True

  else:

    res = False

  return res

def RunInstanceTests():

  """Create and exercise instances."""

  for (test_name, templ, create_fun, num_nodes) in \

      qa_instance.available_instance_tests:

    if (qa_config.TestEnabled(test_name) and

        qa_config.IsTemplateSupported(templ)):

      inodes = qa_config.AcquireManyNodes(num_nodes)

      try:

        instance = RunTest(create_fun, inodes)

        try:

          RunTestIf("instance-user-down", qa_instance.TestInstanceUserDown,

                    instance, qa_config.GetMasterNode())

          RunTestIf("cluster-epo", qa_cluster.TestClusterEpo)

          RunDaemonTests(instance)

          for node in inodes:

            RunTestIf("haskell-confd", qa_node.TestNodeListDrbd, node)

          if len(inodes) > 1:

            RunTestIf("group-rwops", qa_group.TestAssignNodesIncludingSplit,

                      constants.INITIAL_NODE_GROUP_NAME,

                      inodes[0].primary, inodes[1].primary)

          if qa_config.TestEnabled("instance-convert-disk"):

            RunTest(qa_instance.TestInstanceShutdown, instance)

            RunTest(qa_instance.TestInstanceConvertDiskToPlain,

                    instance, inodes)

            RunTest(qa_instance.TestInstanceStartup, instance)

          RunTestIf("instance-modify-disks",

                    qa_instance.TestInstanceModifyDisks, instance)