Synnefo » snf-ganeti » ganeti-local

#!/usr/bin/python

#

# Copyright (C) 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.

"""Tool to upgrade the configuration file.

This code handles only the types supported by simplejson. As an example, "set"

is a "list".

"""

import os

import os.path

import sys

import optparse

import tempfile

import simplejson

from ganeti import utils

from ganeti import cli

options = None

args = None

class Error(Exception):

  """Generic exception"""

  pass

def ReadConfig(path):

  """Reads configuration file.

  """

  f = open(path, 'r')

  try:

    return simplejson.load(f)

  finally:

    f.close()

def WriteConfig(path, data):

  """Writes the configuration file.

  """

  if not options.dry_run:

    utils.CreateBackup(path)

  (fd, name) = tempfile.mkstemp(dir=os.path.dirname(path))

  f = os.fdopen(fd, 'w')

  try:

    try:

      simplejson.dump(data, f)

      f.flush()

      if options.dry_run:

        os.unlink(name)

      else:

        os.rename(name, path)

    except:

      os.unlink(name)

      raise

  finally:

    f.close()

def UpdateFromVersion2To3(cfg):

  """Updates the configuration from version 2 to 3.

  """

  if cfg['cluster']['config_version'] != 2:

    return

  # Add port pool

  if 'tcpudp_port_pool' not in cfg['cluster']:

    cfg['cluster']['tcpudp_port_pool'] = []

  # Add bridge settings

  if 'default_bridge' not in cfg['cluster']:

    cfg['cluster']['default_bridge'] = 'xen-br0'

  for inst in cfg['instances'].values():

    for nic in inst['nics']:

      if 'bridge' not in nic:

        nic['bridge'] = None

  cfg['cluster']['config_version'] = 3

# Main program

if __name__ == "__main__":

  program = os.path.basename(sys.argv[0])

  # Option parsing

  parser = optparse.OptionParser(usage="%prog [options] <config-file>")

  parser.add_option('--dry-run', dest='dry_run',

                    action="store_true",

                    help="Try to do the conversion, but don't write"

                         " output file")

  parser.add_option(cli.FORCE_OPT)

  parser.add_option('--verbose', dest='verbose',

                    action="store_true",

                    help="Verbose output")

  (options, args) = parser.parse_args()

  # Option checking

  if args:

    cfg_file = args[0]

  else:

    raise Error("Configuration file not specified")

  if not options.force:

    usertext = ("%s MUST run on the master node. Is this the master"

                " node?" % program)

    if not cli.AskUser(usertext):

      sys.exit(1)

  config = ReadConfig(cfg_file)

  if options.verbose:

    import pprint

    print "Before upgrade:"

    pprint.pprint(config)

    print

  UpdateFromVersion2To3(config)

  if options.verbose:

    print "After upgrade:"

    pprint.pprint(config)

    print

  WriteConfig(cfg_file, config)

  print "The configuration file has been updated successfully. Please run"

  print "  gnt-cluster copyfile %s" % cfg_file

  print "now."

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