Synnefo » snf-ganeti

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# Copyright (C) 2006, 2007, 2008, 2010, 2011, 2012 Google Inc.

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# the Free Software Foundation; either version 2 of the License, or

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# WITHOUT ANY WARRANTY; without even the implied warranty of

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# General Public License for more details.

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"""Functions to bootstrap a new cluster.

"""

import os

import os.path

import re

import logging

import time

import tempfile

from ganeti.cmdlib import cluster

import ganeti.rpc.node as rpc

from ganeti import ssh

from ganeti import utils

from ganeti import errors

from ganeti import config

from ganeti import constants

from ganeti import objects

from ganeti import ssconf

from ganeti import serializer

from ganeti import hypervisor

from ganeti.storage import drbd

from ganeti.storage import filestorage

from ganeti import netutils

from ganeti import luxi

from ganeti import jstore

from ganeti import pathutils

# ec_id for InitConfig's temporary reservation manager

_INITCONF_ECID = "initconfig-ecid"

#: After how many seconds daemon must be responsive

_DAEMON_READY_TIMEOUT = 10.0

def _InitSSHSetup():

  """Setup the SSH configuration for the cluster.

  This generates a dsa keypair for root, adds the pub key to the

  permitted hosts and adds the hostkey to its own known hosts.

  """

  priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.SSH_LOGIN_USER)

  for name in priv_key, pub_key:

    if os.path.exists(name):

      utils.CreateBackup(name)

    utils.RemoveFile(name)

  result = utils.RunCmd(["ssh-keygen", "-t", "dsa",

                         "-f", priv_key,

                         "-q", "-N", ""])

  if result.failed:

    raise errors.OpExecError("Could not generate ssh keypair, error %s" %

                             result.output)

  utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))

def GenerateHmacKey(file_name):

  """Writes a new HMAC key.

  @type file_name: str

  @param file_name: Path to output file

  """

  utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,

                  backup=True)

def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_spice_cert,

                          new_confd_hmac_key, new_cds,

                          rapi_cert_pem=None, spice_cert_pem=None,

                          spice_cacert_pem=None, cds=None,

                          nodecert_file=pathutils.NODED_CERT_FILE,

                          rapicert_file=pathutils.RAPI_CERT_FILE,

                          spicecert_file=pathutils.SPICE_CERT_FILE,

                          spicecacert_file=pathutils.SPICE_CACERT_FILE,

                          hmackey_file=pathutils.CONFD_HMAC_KEY,

                          cds_file=pathutils.CLUSTER_DOMAIN_SECRET_FILE):

  """Updates the cluster certificates, keys and secrets.

  @type new_cluster_cert: bool

  @param new_cluster_cert: Whether to generate a new cluster certificate

  @type new_rapi_cert: bool

  @param new_rapi_cert: Whether to generate a new RAPI certificate

  @type new_spice_cert: bool

  @param new_spice_cert: Whether to generate a new SPICE certificate

  @type new_confd_hmac_key: bool

  @param new_confd_hmac_key: Whether to generate a new HMAC key

  @type new_cds: bool

  @param new_cds: Whether to generate a new cluster domain secret

  @type rapi_cert_pem: string

  @param rapi_cert_pem: New RAPI certificate in PEM format

  @type spice_cert_pem: string

  @param spice_cert_pem: New SPICE certificate in PEM format

  @type spice_cacert_pem: string

  @param spice_cacert_pem: Certificate of the CA that signed the SPICE

                           certificate, in PEM format

  @type cds: string

  @param cds: New cluster domain secret

  @type nodecert_file: string

  @param nodecert_file: optional override of the node cert file path

  @type rapicert_file: string

  @param rapicert_file: optional override of the rapi cert file path

  @type spicecert_file: string

  @param spicecert_file: optional override of the spice cert file path

  @type spicecacert_file: string

  @param spicecacert_file: optional override of the spice CA cert file path

  @type hmackey_file: string

  @param hmackey_file: optional override of the hmac key file path

  """

  # noded SSL certificate

  cluster_cert_exists = os.path.exists(nodecert_file)

  if new_cluster_cert or not cluster_cert_exists:

    if cluster_cert_exists:

      utils.CreateBackup(nodecert_file)

    logging.debug("Generating new cluster certificate at %s", nodecert_file)

    utils.GenerateSelfSignedSslCert(nodecert_file)

  # confd HMAC key

  if new_confd_hmac_key or not os.path.exists(hmackey_file):

    logging.debug("Writing new confd HMAC key to %s", hmackey_file)

    GenerateHmacKey(hmackey_file)

  # RAPI

  rapi_cert_exists = os.path.exists(rapicert_file)

  if rapi_cert_pem:

    # Assume rapi_pem contains a valid PEM-formatted certificate and key

    logging.debug("Writing RAPI certificate at %s", rapicert_file)

    utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)

  elif new_rapi_cert or not rapi_cert_exists:

    if rapi_cert_exists:

      utils.CreateBackup(rapicert_file)

    logging.debug("Generating new RAPI certificate at %s", rapicert_file)

    utils.GenerateSelfSignedSslCert(rapicert_file)

  # SPICE

  spice_cert_exists = os.path.exists(spicecert_file)

  spice_cacert_exists = os.path.exists(spicecacert_file)

  if spice_cert_pem:

    # spice_cert_pem implies also spice_cacert_pem

    logging.debug("Writing SPICE certificate at %s", spicecert_file)

    utils.WriteFile(spicecert_file, data=spice_cert_pem, backup=True)

    logging.debug("Writing SPICE CA certificate at %s", spicecacert_file)

    utils.WriteFile(spicecacert_file, data=spice_cacert_pem, backup=True)

  elif new_spice_cert or not spice_cert_exists:

    if spice_cert_exists:

      utils.CreateBackup(spicecert_file)

    if spice_cacert_exists:

      utils.CreateBackup(spicecacert_file)

    logging.debug("Generating new self-signed SPICE certificate at %s",

                  spicecert_file)

    (_, cert_pem) = utils.GenerateSelfSignedSslCert(spicecert_file)

    # Self-signed certificate -> the public certificate is also the CA public

    # certificate

    logging.debug("Writing the public certificate to %s",

                  spicecert_file)

    utils.io.WriteFile(spicecacert_file, mode=0400, data=cert_pem)

  # Cluster domain secret

  if cds:

    logging.debug("Writing cluster domain secret to %s", cds_file)

    utils.WriteFile(cds_file, data=cds, backup=True)

  elif new_cds or not os.path.exists(cds_file):

    logging.debug("Generating new cluster domain secret at %s", cds_file)

    GenerateHmacKey(cds_file)

def _InitGanetiServerSetup(master_name):

  """Setup the necessary configuration for the initial node daemon.

  This creates the nodepass file containing the shared password for

  the cluster, generates the SSL certificate and starts the node daemon.

  @type master_name: str

  @param master_name: Name of the master node

  """

  # Generate cluster secrets

  GenerateClusterCrypto(True, False, False, False, False)

  result = utils.RunCmd([pathutils.DAEMON_UTIL, "start", constants.NODED])

  if result.failed:

    raise errors.OpExecError("Could not start the node daemon, command %s"

                             " had exitcode %s and error %s" %

                             (result.cmd, result.exit_code, result.output))

  _WaitForNodeDaemon(master_name)

def _WaitForNodeDaemon(node_name):

  """Wait for node daemon to become responsive.

  """

  def _CheckNodeDaemon():

    # Pylint bug <http://www.logilab.org/ticket/35642>

    # pylint: disable=E1101

    result = rpc.BootstrapRunner().call_version([node_name])[node_name]

    if result.fail_msg:

      raise utils.RetryAgain()

  try:

    utils.Retry(_CheckNodeDaemon, 1.0, _DAEMON_READY_TIMEOUT)

  except utils.RetryTimeout:

    raise errors.OpExecError("Node daemon on %s didn't answer queries within"

                             " %s seconds" % (node_name, _DAEMON_READY_TIMEOUT))

def _WaitForMasterDaemon():

  """Wait for master daemon to become responsive.

  """

  def _CheckMasterDaemon():

    try:

      cl = luxi.Client()

      (cluster_name, ) = cl.QueryConfigValues(["cluster_name"])

    except Exception:

      raise utils.RetryAgain()

    logging.debug("Received cluster name %s from master", cluster_name)

  try:

    utils.Retry(_CheckMasterDaemon, 1.0, _DAEMON_READY_TIMEOUT)

  except utils.RetryTimeout:

    raise errors.OpExecError("Master daemon didn't answer queries within"

                             " %s seconds" % _DAEMON_READY_TIMEOUT)

def _WaitForSshDaemon(hostname, port, family):

  """Wait for SSH daemon to become responsive.

  """

  hostip = netutils.GetHostname(name=hostname, family=family).ip

  def _CheckSshDaemon():

    if netutils.TcpPing(hostip, port, timeout=1.0, live_port_needed=True):

      logging.debug("SSH daemon on %s:%s (IP address %s) has become"

                    " responsive", hostname, port, hostip)

    else:

      raise utils.RetryAgain()

  try:

    utils.Retry(_CheckSshDaemon, 1.0, _DAEMON_READY_TIMEOUT)

  except utils.RetryTimeout:

    raise errors.OpExecError("SSH daemon on %s:%s (IP address %s) didn't"

                             " become responsive within %s seconds" %

                             (hostname, port, hostip, _DAEMON_READY_TIMEOUT))

def RunNodeSetupCmd(cluster_name, node, basecmd, debug, verbose,

                    use_cluster_key, ask_key, strict_host_check,

                    port, data):

  """Runs a command to configure something on a remote machine.

  @type cluster_name: string

  @param cluster_name: Cluster name

  @type node: string

  @param node: Node name

  @type basecmd: string

  @param basecmd: Base command (path on the remote machine)

  @type debug: bool

  @param debug: Enable debug output

  @type verbose: bool

  @param verbose: Enable verbose output

  @type use_cluster_key: bool

  @param use_cluster_key: See L{ssh.SshRunner.BuildCmd}

  @type ask_key: bool

  @param ask_key: See L{ssh.SshRunner.BuildCmd}

  @type strict_host_check: bool

  @param strict_host_check: See L{ssh.SshRunner.BuildCmd}

  @type port: int

  @param port: The SSH port of the remote machine or None for the default

  @param data: JSON-serializable input data for script (passed to stdin)

  """

  cmd = [basecmd]

  # Pass --debug/--verbose to the external script if set on our invocation

  if debug:

    cmd.append("--debug")

  if verbose:

    cmd.append("--verbose")

  if port is None:

    port = netutils.GetDaemonPort(constants.SSH)

  family = ssconf.SimpleStore().GetPrimaryIPFamily()

  srun = ssh.SshRunner(cluster_name,

                       ipv6=(family == netutils.IP6Address.family))

  scmd = srun.BuildCmd(node, constants.SSH_LOGIN_USER,

                       utils.ShellQuoteArgs(cmd),

                       batch=False, ask_key=ask_key, quiet=False,

                       strict_host_check=strict_host_check,

                       use_cluster_key=use_cluster_key,

                       port=port)

  tempfh = tempfile.TemporaryFile()

  try:

    tempfh.write(serializer.DumpJson(data))

    tempfh.seek(0)

    result = utils.RunCmd(scmd, interactive=True, input_fd=tempfh)

  finally:

    tempfh.close()

  if result.failed:

    raise errors.OpExecError("Command '%s' failed: %s" %

                             (result.cmd, result.fail_reason))

  _WaitForSshDaemon(node, port, family)

def _InitFileStorageDir(file_storage_dir):

  """Initialize if needed the file storage.

  @param file_storage_dir: the user-supplied value

  @return: either empty string (if file storage was disabled at build

      time) or the normalized path to the storage directory

  """

  file_storage_dir = os.path.normpath(file_storage_dir)

  if not os.path.isabs(file_storage_dir):

    raise errors.OpPrereqError("File storage directory '%s' is not an absolute"

                               " path" % file_storage_dir, errors.ECODE_INVAL)

  if not os.path.exists(file_storage_dir):

    try:

      os.makedirs(file_storage_dir, 0750)

    except OSError, err:

      raise errors.OpPrereqError("Cannot create file storage directory"

                                 " '%s': %s" % (file_storage_dir, err),

                                 errors.ECODE_ENVIRON)

  if not os.path.isdir(file_storage_dir):

    raise errors.OpPrereqError("The file storage directory '%s' is not"

                               " a directory." % file_storage_dir,

                               errors.ECODE_ENVIRON)

  return file_storage_dir

def _PrepareFileBasedStorage(

    enabled_disk_templates, file_storage_dir,

    default_dir, file_disk_template,

    init_fn=_InitFileStorageDir, acceptance_fn=None):

  """Checks if a file-base storage type is enabled and inits the dir.

  @type enabled_disk_templates: list of string

  @param enabled_disk_templates: list of enabled disk templates

  @type file_storage_dir: string

  @param file_storage_dir: the file storage directory

  @type default_dir: string

  @param default_dir: default file storage directory when C{file_storage_dir}

      is 'None'

  @type file_disk_template: string

  @param file_disk_template: a disk template whose storage type is 'ST_FILE' or

      'ST_SHARED_FILE'

  @rtype: string

  @returns: the name of the actual file storage directory

  """

  assert (file_disk_template in utils.storage.GetDiskTemplatesOfStorageTypes(

            constants.ST_FILE, constants.ST_SHARED_FILE

         ))

  if file_storage_dir is None:

    file_storage_dir = default_dir

  if not acceptance_fn:

    acceptance_fn = \

        lambda path: filestorage.CheckFileStoragePathAcceptance(

            path, exact_match_ok=True)

  cluster.CheckFileStoragePathVsEnabledDiskTemplates(

      logging.warning, file_storage_dir, enabled_disk_templates)

  file_storage_enabled = file_disk_template in enabled_disk_templates

  if file_storage_enabled:

    try:

      acceptance_fn(file_storage_dir)

    except errors.FileStoragePathError as e:

      raise errors.OpPrereqError(str(e))

    result_file_storage_dir = init_fn(file_storage_dir)

  else:

    result_file_storage_dir = file_storage_dir

  return result_file_storage_dir

def _PrepareFileStorage(

    enabled_disk_templates, file_storage_dir, init_fn=_InitFileStorageDir,

    acceptance_fn=None):

  """Checks if file storage is enabled and inits the dir.

  @see: C{_PrepareFileBasedStorage}

  """

  return _PrepareFileBasedStorage(

      enabled_disk_templates, file_storage_dir,

      pathutils.DEFAULT_FILE_STORAGE_DIR, constants.DT_FILE,

      init_fn=init_fn, acceptance_fn=acceptance_fn)

def _PrepareSharedFileStorage(

    enabled_disk_templates, file_storage_dir, init_fn=_InitFileStorageDir,

    acceptance_fn=None):

  """Checks if shared file storage is enabled and inits the dir.

  @see: C{_PrepareFileBasedStorage}

  """

  return _PrepareFileBasedStorage(

      enabled_disk_templates, file_storage_dir,

      pathutils.DEFAULT_SHARED_FILE_STORAGE_DIR, constants.DT_SHARED_FILE,

      init_fn=init_fn, acceptance_fn=acceptance_fn)

def _PrepareGlusterStorage(

    enabled_disk_templates, file_storage_dir, init_fn=_InitFileStorageDir,

    acceptance_fn=None):

  """Checks if gluster storage is enabled and inits the dir.

  @see: C{_PrepareFileBasedStorage}

  """

  return _PrepareFileBasedStorage(

      enabled_disk_templates, file_storage_dir,

      pathutils.DEFAULT_GLUSTER_STORAGE_DIR, constants.DT_GLUSTER,

      init_fn=init_fn, acceptance_fn=acceptance_fn)

def _InitCheckEnabledDiskTemplates(enabled_disk_templates):

  """Checks the sanity of the enabled disk templates.

  """

  if not enabled_disk_templates:

    raise errors.OpPrereqError("Enabled disk templates list must contain at"

                               " least one member", errors.ECODE_INVAL)

  invalid_disk_templates = \

    set(enabled_disk_templates) - constants.DISK_TEMPLATES

  if invalid_disk_templates:

    raise errors.OpPrereqError("Enabled disk templates list contains invalid"

                               " entries: %s" % invalid_disk_templates,

                               errors.ECODE_INVAL)

def _RestrictIpolicyToEnabledDiskTemplates(ipolicy, enabled_disk_templates):

  """Restricts the ipolicy's disk templates to the enabled ones.

  This function clears the ipolicy's list of allowed disk templates from the

  ones that are not enabled by the cluster.

  @type ipolicy: dict

  @param ipolicy: the instance policy

  @type enabled_disk_templates: list of string

  @param enabled_disk_templates: the list of cluster-wide enabled disk

    templates

  """

  assert constants.IPOLICY_DTS in ipolicy

  allowed_disk_templates = ipolicy[constants.IPOLICY_DTS]

  restricted_disk_templates = list(set(allowed_disk_templates)

                                   .intersection(set(enabled_disk_templates)))

  ipolicy[constants.IPOLICY_DTS] = restricted_disk_templates

def _InitCheckDrbdHelper(drbd_helper, drbd_enabled):

  """Checks the DRBD usermode helper.

  @type drbd_helper: string

  @param drbd_helper: name of the DRBD usermode helper that the system should

    use

  """

  if not drbd_enabled:

    return

  if drbd_helper is not None:

    try:

      curr_helper = drbd.DRBD8.GetUsermodeHelper()

    except errors.BlockDeviceError, err:

      raise errors.OpPrereqError("Error while checking drbd helper"

                                 " (disable drbd with --enabled-disk-templates"

                                 " if you are not using drbd): %s" % str(err),

                                 errors.ECODE_ENVIRON)

    if drbd_helper != curr_helper:

      raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"

                                 " is the current helper" % (drbd_helper,

                                                             curr_helper),

                                 errors.ECODE_INVAL)

def InitCluster(cluster_name, mac_prefix, # pylint: disable=R0913, R0914

                master_netmask, master_netdev, file_storage_dir,

                shared_file_storage_dir, gluster_storage_dir,

                candidate_pool_size, secondary_ip=None,

                vg_name=None, beparams=None, nicparams=None, ndparams=None,

                hvparams=None, diskparams=None, enabled_hypervisors=None,

                modify_etc_hosts=True, modify_ssh_setup=True,

                maintain_node_health=False, drbd_helper=None, uid_pool=None,

                default_iallocator=None, default_iallocator_params=None,

                primary_ip_version=None, ipolicy=None,

                prealloc_wipe_disks=False, use_external_mip_script=False,

                hv_state=None, disk_state=None, enabled_disk_templates=None):

  """Initialise the cluster.

  @type candidate_pool_size: int

  @param candidate_pool_size: master candidate pool size

  @type enabled_disk_templates: list of string

  @param enabled_disk_templates: list of disk_templates to be used in this

    cluster

  """

  # TODO: complete the docstring

  if config.ConfigWriter.IsCluster():

    raise errors.OpPrereqError("Cluster is already initialised",

                               errors.ECODE_STATE)

  if not enabled_hypervisors:

    raise errors.OpPrereqError("Enabled hypervisors list must contain at"

                               " least one member", errors.ECODE_INVAL)

  invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES

  if invalid_hvs:

    raise errors.OpPrereqError("Enabled hypervisors contains invalid"

                               " entries: %s" % invalid_hvs,

                               errors.ECODE_INVAL)

  _InitCheckEnabledDiskTemplates(enabled_disk_templates)

  try:

    ipcls = netutils.IPAddress.GetClassFromIpVersion(primary_ip_version)

  except errors.ProgrammerError:

    raise errors.OpPrereqError("Invalid primary ip version: %d." %

                               primary_ip_version, errors.ECODE_INVAL)

  hostname = netutils.GetHostname(family=ipcls.family)

  if not ipcls.IsValid(hostname.ip):

    raise errors.OpPrereqError("This host's IP (%s) is not a valid IPv%d"

                               " address." % (hostname.ip, primary_ip_version),

                               errors.ECODE_INVAL)

  if ipcls.IsLoopback(hostname.ip):

    raise errors.OpPrereqError("This host's IP (%s) resolves to a loopback"

                               " address. Please fix DNS or %s." %

                               (hostname.ip, pathutils.ETC_HOSTS),

                               errors.ECODE_ENVIRON)

  if not ipcls.Own(hostname.ip):

    raise errors.OpPrereqError("Inconsistency: this host's name resolves"

                               " to %s,\nbut this ip address does not"

                               " belong to this host" %

                               hostname.ip, errors.ECODE_ENVIRON)

  clustername = netutils.GetHostname(name=cluster_name, family=ipcls.family)

  if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT, timeout=5):

    raise errors.OpPrereqError("Cluster IP already active",

                               errors.ECODE_NOTUNIQUE)

  if not secondary_ip:

    if primary_ip_version == constants.IP6_VERSION:

      raise errors.OpPrereqError("When using a IPv6 primary address, a valid"

                                 " IPv4 address must be given as secondary",

                                 errors.ECODE_INVAL)

    secondary_ip = hostname.ip

  if not netutils.IP4Address.IsValid(secondary_ip):

    raise errors.OpPrereqError("Secondary IP address (%s) has to be a valid"

                               " IPv4 address." % secondary_ip,

                               errors.ECODE_INVAL)

  if not netutils.IP4Address.Own(secondary_ip):

    raise errors.OpPrereqError("You gave %s as secondary IP,"

                               " but it does not belong to this host." %

                               secondary_ip, errors.ECODE_ENVIRON)

  if master_netmask is not None:

    if not ipcls.ValidateNetmask(master_netmask):

      raise errors.OpPrereqError("CIDR netmask (%s) not valid for IPv%s " %

                                  (master_netmask, primary_ip_version),

                                 errors.ECODE_INVAL)

  else:

    master_netmask = ipcls.iplen

  if vg_name:

    # Check if volume group is valid

    vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,

                                          constants.MIN_VG_SIZE)

    if vgstatus:

      raise errors.OpPrereqError("Error: %s" % vgstatus, errors.ECODE_INVAL)

  drbd_enabled = constants.DT_DRBD8 in enabled_disk_templates

  _InitCheckDrbdHelper(drbd_helper, drbd_enabled)

  logging.debug("Stopping daemons (if any are running)")

  result = utils.RunCmd([pathutils.DAEMON_UTIL, "stop-all"])

  if result.failed:

    raise errors.OpExecError("Could not stop daemons, command %s"

                             " had exitcode %s and error '%s'" %

                             (result.cmd, result.exit_code, result.output))

  file_storage_dir = _PrepareFileStorage(enabled_disk_templates,

                                         file_storage_dir)

  shared_file_storage_dir = _PrepareSharedFileStorage(enabled_disk_templates,

                                                      shared_file_storage_dir)

  if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):

    raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,

                               errors.ECODE_INVAL)

  if not nicparams.get('mode', None) == constants.NIC_MODE_OVS:

    # Do not do this check if mode=openvswitch, since the openvswitch is not

    # created yet

    result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])

    if result.failed:

      raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %

                                 (master_netdev,

                                  result.output.strip()), errors.ECODE_INVAL)

  dirs = [(pathutils.RUN_DIR, constants.RUN_DIRS_MODE)]

  utils.EnsureDirs(dirs)

  objects.UpgradeBeParams(beparams)

  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)

  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

  objects.NIC.CheckParameterSyntax(nicparams)

  full_ipolicy = objects.FillIPolicy(constants.IPOLICY_DEFAULTS, ipolicy)

  _RestrictIpolicyToEnabledDiskTemplates(full_ipolicy, enabled_disk_templates)

  if ndparams is not None:

    utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)

  else:

    ndparams = dict(constants.NDC_DEFAULTS)

  # This is ugly, as we modify the dict itself

  # FIXME: Make utils.ForceDictType pure functional or write a wrapper

  # around it

  if hv_state:

    for hvname, hvs_data in hv_state.items():

      utils.ForceDictType(hvs_data, constants.HVSTS_PARAMETER_TYPES)

      hv_state[hvname] = objects.Cluster.SimpleFillHvState(hvs_data)

  else:

    hv_state = dict((hvname, constants.HVST_DEFAULTS)

                    for hvname in enabled_hypervisors)

  # FIXME: disk_state has no default values yet

  if disk_state:

    for storage, ds_data in disk_state.items():

      if storage not in constants.DS_VALID_TYPES:

        raise errors.OpPrereqError("Invalid storage type in disk state: %s" %

                                   storage, errors.ECODE_INVAL)

      for ds_name, state in ds_data.items():

        utils.ForceDictType(state, constants.DSS_PARAMETER_TYPES)

        ds_data[ds_name] = objects.Cluster.SimpleFillDiskState(state)

  # hvparams is a mapping of hypervisor->hvparams dict

  for hv_name, hv_params in hvparams.iteritems():

    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)

    hv_class = hypervisor.GetHypervisor(hv_name)

    hv_class.CheckParameterSyntax(hv_params)

  # diskparams is a mapping of disk-template->diskparams dict

  for template, dt_params in diskparams.items():

    param_keys = set(dt_params.keys())

    default_param_keys = set(constants.DISK_DT_DEFAULTS[template].keys())

    if not (param_keys <= default_param_keys):

      unknown_params = param_keys - default_param_keys

      raise errors.OpPrereqError("Invalid parameters for disk template %s:"

                                 " %s" % (template,

                                          utils.CommaJoin(unknown_params)),

                                 errors.ECODE_INVAL)

    utils.ForceDictType(dt_params, constants.DISK_DT_TYPES)

    if template == constants.DT_DRBD8 and vg_name is not None:

      # The default METAVG value is equal to the VG name set at init time,

      # if provided

      dt_params[constants.DRBD_DEFAULT_METAVG] = vg_name

  try:

    utils.VerifyDictOptions(diskparams, constants.DISK_DT_DEFAULTS)

  except errors.OpPrereqError, err:

    raise errors.OpPrereqError("While verify diskparam options: %s" % err,

                               errors.ECODE_INVAL)

  # set up ssh config and /etc/hosts

  rsa_sshkey = ""

  dsa_sshkey = ""

  if os.path.isfile(pathutils.SSH_HOST_RSA_PUB):

    sshline = utils.ReadFile(pathutils.SSH_HOST_RSA_PUB)

    rsa_sshkey = sshline.split(" ")[1]

  if os.path.isfile(pathutils.SSH_HOST_DSA_PUB):

    sshline = utils.ReadFile(pathutils.SSH_HOST_DSA_PUB)

    dsa_sshkey = sshline.split(" ")[1]

  if not rsa_sshkey and not dsa_sshkey:

    raise errors.OpPrereqError("Failed to find SSH public keys",

                               errors.ECODE_ENVIRON)

  if modify_etc_hosts:

    utils.AddHostToEtcHosts(hostname.name, hostname.ip)

  if modify_ssh_setup:

    _InitSSHSetup()

  if default_iallocator is not None:

    alloc_script = utils.FindFile(default_iallocator,

                                  constants.IALLOCATOR_SEARCH_PATH,

                                  os.path.isfile)

    if alloc_script is None:

      raise errors.OpPrereqError("Invalid default iallocator script '%s'"

                                 " specified" % default_iallocator,

                                 errors.ECODE_INVAL)

  elif constants.HTOOLS:

    # htools was enabled at build-time, we default to it

    if utils.FindFile(constants.IALLOC_HAIL,

                      constants.IALLOCATOR_SEARCH_PATH,

                      os.path.isfile):

      default_iallocator = constants.IALLOC_HAIL

  now = time.time()

  # init of cluster config file

  cluster_config = objects.Cluster(

    serial_no=1,

    rsahostkeypub=rsa_sshkey,

    dsahostkeypub=dsa_sshkey,

    highest_used_port=(constants.FIRST_DRBD_PORT - 1),

    mac_prefix=mac_prefix,

    volume_group_name=vg_name,

    tcpudp_port_pool=set(),

    master_ip=clustername.ip,

    master_netmask=master_netmask,

    master_netdev=master_netdev,

    cluster_name=clustername.name,

    file_storage_dir=file_storage_dir,

    shared_file_storage_dir=shared_file_storage_dir,

    gluster_storage_dir=gluster_storage_dir,

    enabled_hypervisors=enabled_hypervisors,

    beparams={constants.PP_DEFAULT: beparams},

    nicparams={constants.PP_DEFAULT: nicparams},

    ndparams=ndparams,

    hvparams=hvparams,

    diskparams=diskparams,

    candidate_pool_size=candidate_pool_size,

    modify_etc_hosts=modify_etc_hosts,

    modify_ssh_setup=modify_ssh_setup,

    uid_pool=uid_pool,

    ctime=now,

    mtime=now,

    maintain_node_health=maintain_node_health,

    drbd_usermode_helper=drbd_helper,

    default_iallocator=default_iallocator,