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#
#

# Copyright (C) 2006, 2007, 2008 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.


"""Functions to bootstrap a new cluster.

"""

import os
import os.path
import sha
import re
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import logging
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from ganeti import rpc
from ganeti import ssh
from ganeti import utils
from ganeti import errors
from ganeti import config
from ganeti import constants
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from ganeti import objects
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from ganeti import ssconf

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from ganeti.rpc import RpcRunner
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def _InitSSHSetup(node):
  """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.

  Args:
    node: the name of this host as a fqdn

  """
  priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)

  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)

  f = open(pub_key, 'r')
  try:
    utils.AddAuthorizedKey(auth_keys, f.read(8192))
  finally:
    f.close()


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def _InitGanetiServerSetup():
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  """Setup the necessary configuration for the initial node daemon.

  This creates the nodepass file containing the shared password for
  the cluster and also generates the SSL certificate.

  """
  # Create pseudo random password
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  randpass = utils.GenerateSecret()
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  # and write it into the config file
  utils.WriteFile(constants.CLUSTER_PASSWORD_FILE,
                  data="%s\n" % randpass, mode=0400)
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  result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
                         "-days", str(365*5), "-nodes", "-x509",
                         "-keyout", constants.SSL_CERT_FILE,
                         "-out", constants.SSL_CERT_FILE, "-batch"])
  if result.failed:
    raise errors.OpExecError("could not generate server ssl cert, command"
                             " %s had exitcode %s and error message %s" %
                             (result.cmd, result.exit_code, result.output))

  os.chmod(constants.SSL_CERT_FILE, 0400)

  result = utils.RunCmd([constants.NODE_INITD_SCRIPT, "restart"])

  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))


def InitCluster(cluster_name, hypervisor_type, mac_prefix, def_bridge,
                master_netdev, file_storage_dir,
                secondary_ip=None,
                vg_name=None):
  """Initialise the cluster.

  """
  if config.ConfigWriter.IsCluster():
    raise errors.OpPrereqError("Cluster is already initialised")

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  if hypervisor_type == constants.HT_XEN_HVM:
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    if not os.path.exists(constants.VNC_PASSWORD_FILE):
      raise errors.OpPrereqError("Please prepare the cluster VNC"
                                 "password file %s" %
                                 constants.VNC_PASSWORD_FILE)

  hostname = utils.HostInfo()

  if hostname.ip.startswith("127."):
    raise errors.OpPrereqError("This host's IP resolves to the private"
                               " range (%s). Please fix DNS or %s." %
                               (hostname.ip, constants.ETC_HOSTS))

  if not utils.TcpPing(hostname.ip, constants.DEFAULT_NODED_PORT,
                       source=constants.LOCALHOST_IP_ADDRESS):
    raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                               " to %s,\nbut this ip address does not"
                               " belong to this host."
                               " Aborting." % hostname.ip)

  clustername = utils.HostInfo(cluster_name)

  if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
                   timeout=5):
    raise errors.OpPrereqError("Cluster IP already active. Aborting.")

  if secondary_ip:
    if not utils.IsValidIP(secondary_ip):
      raise errors.OpPrereqError("Invalid secondary ip given")
    if (secondary_ip != hostname.ip and
        (not utils.TcpPing(secondary_ip, constants.DEFAULT_NODED_PORT,
                           source=constants.LOCALHOST_IP_ADDRESS))):
      raise errors.OpPrereqError("You gave %s as secondary IP,"
                                 " but it does not belong to this host." %
                                 secondary_ip)
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  else:
    secondary_ip = hostname.ip
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  if vg_name is not None:
    # Check if volume group is valid
    vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
                                          constants.MIN_VG_SIZE)
    if vgstatus:
      raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
                                 " you are not using lvm" % vgstatus)

  file_storage_dir = os.path.normpath(file_storage_dir)

  if not os.path.isabs(file_storage_dir):
    raise errors.OpPrereqError("The file storage directory you passed is"
                               " not an absolute path.")

  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))

  if not os.path.isdir(file_storage_dir):
    raise errors.OpPrereqError("The file storage directory '%s' is not"
                               " a directory." % 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)

  if hypervisor_type not in constants.HYPER_TYPES:
    raise errors.OpPrereqError("Invalid hypervisor type given '%s'" %
                               hypervisor_type)

  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()))

  if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
          os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
    raise errors.OpPrereqError("Init.d script '%s' missing or not"
                               " executable." % constants.NODE_INITD_SCRIPT)

  # set up the inter-node password and certificate
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  _InitGanetiServerSetup()
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  # set up ssh config and /etc/hosts
  f = open(constants.SSH_HOST_RSA_PUB, 'r')
  try:
    sshline = f.read()
  finally:
    f.close()
  sshkey = sshline.split(" ")[1]

  utils.AddHostToEtcHosts(hostname.name)
  _InitSSHSetup(hostname.name)

  # init of cluster config file
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  cluster_config = objects.Cluster(
    serial_no=1,
    rsahostkeypub=sshkey,
    highest_used_port=(constants.FIRST_DRBD_PORT - 1),
    mac_prefix=mac_prefix,
    volume_group_name=vg_name,
    default_bridge=def_bridge,
    tcpudp_port_pool=set(),
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    hypervisor=hypervisor_type,
    master_node=hostname.name,
    master_ip=clustername.ip,
    master_netdev=master_netdev,
    cluster_name=clustername.name,
    file_storage_dir=file_storage_dir,
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    )
  master_node_config = objects.Node(name=hostname.name,
                                    primary_ip=hostname.ip,
                                    secondary_ip=secondary_ip)
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  cfg = InitConfig(constants.CONFIG_VERSION,
                   cluster_config, master_node_config)
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  ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
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  # start the master ip
  # TODO: Review rpc call from bootstrap
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  RpcRunner.call_node_start_master(hostname.name, True)
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def InitConfig(version, cluster_config, master_node_config,
               cfg_file=constants.CLUSTER_CONF_FILE):
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  """Create the initial cluster configuration.

  It will contain the current node, which will also be the master
  node, and no instances.

  @type version: int
  @param version: Configuration version
  @type cluster_config: objects.Cluster
  @param cluster_config: Cluster configuration
  @type master_node_config: objects.Node
  @param master_node_config: Master node configuration
  @type file_name: string
  @param file_name: Configuration file path

  @rtype: ssconf.SimpleConfigWriter
  @returns: Initialized config instance

  """
  nodes = {
    master_node_config.name: master_node_config,
    }

  config_data = objects.ConfigData(version=version,
                                   cluster=cluster_config,
                                   nodes=nodes,
                                   instances={},
                                   serial_no=1)
  cfg = ssconf.SimpleConfigWriter.FromDict(config_data.ToDict(), cfg_file)
  cfg.Save()

  return cfg
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def FinalizeClusterDestroy(master):
  """Execute the last steps of cluster destroy

  This function shuts down all the daemons, completing the destroy
  begun in cmdlib.LUDestroyOpcode.

  """
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  if not RpcRunner.call_node_stop_master(master, True):
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    logging.warning("Could not disable the master role")
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  if not RpcRunner.call_node_leave_cluster(master):
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    logging.warning("Could not shutdown the node daemon and cleanup the node")


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def SetupNodeDaemon(node, ssh_key_check):
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  """Add a node to the cluster.

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  This function must be called before the actual opcode, and will ssh
  to the remote node, copy the needed files, and start ganeti-noded,
  allowing the master to do the rest via normal rpc calls.
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  Args:
    node: fully qualified domain name for the new node

  """
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  cfg = ssconf.SimpleConfigReader()
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  sshrunner = ssh.SshRunner(cfg.GetClusterName())
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  gntpass = utils.GetNodeDaemonPassword()
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  if not re.match('^[a-zA-Z0-9.]{1,64}$', gntpass):
    raise errors.OpExecError("ganeti password corruption detected")
  f = open(constants.SSL_CERT_FILE)
  try:
    gntpem = f.read(8192)
  finally:
    f.close()
  # in the base64 pem encoding, neither '!' nor '.' are valid chars,
  # so we use this to detect an invalid certificate; as long as the
  # cert doesn't contain this, the here-document will be correctly
  # parsed by the shell sequence below
  if re.search('^!EOF\.', gntpem, re.MULTILINE):
    raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
  if not gntpem.endswith("\n"):
    raise errors.OpExecError("PEM must end with newline")

  # set up inter-node password and certificate and restarts the node daemon
  # and then connect with ssh to set password and start ganeti-noded
  # note that all the below variables are sanitized at this point,
  # either by being constants or by the checks above
  mycommand = ("umask 077 && "
               "echo '%s' > '%s' && "
               "cat > '%s' << '!EOF.' && \n"
               "%s!EOF.\n%s restart" %
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               (gntpass, constants.CLUSTER_PASSWORD_FILE,
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                constants.SSL_CERT_FILE, gntpem,
                constants.NODE_INITD_SCRIPT))

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  result = sshrunner.Run(node, 'root', mycommand, batch=False,
                         ask_key=ssh_key_check,
                         use_cluster_key=False,
                         strict_host_check=ssh_key_check)
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  if result.failed:
    raise errors.OpExecError("Remote command on node %s, error: %s,"
                             " output: %s" %
                             (node, result.fail_reason, result.output))

  return 0

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def MasterFailover():
  """Failover the master node.

  This checks that we are not already the master, and will cause the
  current master to cease being master, and the non-master to become
  new master.

  """
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  cfg = ssconf.SimpleConfigWriter()
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  new_master = utils.HostInfo().name
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  old_master = cfg.GetMasterNode()
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  if old_master == new_master:
    raise errors.OpPrereqError("This commands must be run on the node"
                               " where you want the new master to be."
                               " %s is already the master" %
                               old_master)
  # end checks

  rcode = 0

  logging.info("setting master to %s, old master: %s", new_master, old_master)

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  if not RpcRunner.call_node_stop_master(old_master, True):
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    logging.error("could disable the master role on the old master"
                 " %s, please disable manually", old_master)

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  cfg.SetMasterNode(new_master)
  cfg.Save()
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  # Here we have a phase where no master should be running
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  if not RpcRunner.call_upload_file(cfg.GetNodeList(),
                                    constants.CLUSTER_CONF_FILE):
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    logging.error("could not distribute the new simple store master file"
                  " to the other nodes, please check.")
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  if not RpcRunner.call_node_start_master(new_master, True):
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    logging.error("could not start the master role on the new master"
                  " %s, please check", new_master)
    rcode = 1

  return rcode