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#!/usr/bin/python |
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# |
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# Copyright (C) 2007 Google Inc. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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# 02110-1301, USA. |
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|
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|
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"""Tool to upgrade the configuration file. |
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|
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This code handles only the types supported by simplejson. As an example, "set" |
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is a "list". Old Pickle based configurations files are converted to JSON during |
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the process. |
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|
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""" |
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|
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|
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import os |
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import os.path |
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import sys |
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import re |
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import optparse |
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import tempfile |
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import simplejson |
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|
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from ganeti import utils |
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from ganeti.cli import AskUser, FORCE_OPT |
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|
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|
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options = None |
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args = None |
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|
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|
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class Error(Exception): |
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"""Generic exception""" |
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pass |
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|
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|
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# {{{ Support for old Pickle files |
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class UpgradeDict(dict): |
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"""Base class for internal config classes. |
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|
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""" |
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def __setstate__(self, state): |
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self.update(state) |
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|
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def __getstate__(self): |
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return self.copy() |
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|
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|
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def FindGlobal(module, name): |
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"""Wraps Ganeti config classes to internal ones. |
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|
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This function may only return types supported by simplejson. |
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|
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""" |
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if module == "ganeti.objects": |
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return UpgradeDict |
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elif module == "__builtin__" and name == "set": |
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return list |
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|
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return getattr(sys.modules[module], name) |
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|
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|
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def ReadPickleFile(f): |
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"""Reads an old Pickle configuration. |
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|
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""" |
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import cPickle |
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|
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loader = cPickle.Unpickler(f) |
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loader.find_global = FindGlobal |
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return loader.load() |
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|
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|
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def IsPickleFile(f): |
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"""Checks whether a file is using the Pickle format. |
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|
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""" |
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magic = f.read(128) |
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try: |
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return not re.match('^\s*\{', magic) |
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finally: |
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f.seek(-len(magic), 1) |
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# }}} |
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|
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|
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def ReadJsonFile(f): |
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"""Reads a JSON file. |
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|
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""" |
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return simplejson.load(f) |
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|
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|
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def ReadConfig(path): |
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"""Reads configuration file. |
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|
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""" |
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f = open(path, 'r') |
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try: |
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if IsPickleFile(f): |
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return ReadPickleFile(f) |
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else: |
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return ReadJsonFile(f) |
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finally: |
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f.close() |
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|
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|
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def WriteConfig(path, data): |
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"""Writes the configuration file. |
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|
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""" |
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if not options.dry_run: |
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utils.CreateBackup(path) |
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|
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(fd, name) = tempfile.mkstemp(dir=os.path.dirname(path)) |
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f = os.fdopen(fd, 'w') |
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try: |
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try: |
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simplejson.dump(data, f) |
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f.flush() |
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if options.dry_run: |
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os.unlink(name) |
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else: |
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os.rename(name, path) |
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except: |
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os.unlink(name) |
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raise |
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finally: |
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f.close() |
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|
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|
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def UpdateFromVersion2To3(cfg): |
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"""Updates the configuration from version 2 to 3. |
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|
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""" |
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if cfg['cluster']['config_version'] != 2: |
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return |
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|
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# Add port pool |
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if 'tcpudp_port_pool' not in cfg['cluster']: |
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cfg['cluster']['tcpudp_port_pool'] = [] |
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|
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# Add bridge settings |
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if 'default_bridge' not in cfg['cluster']: |
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cfg['cluster']['default_bridge'] = 'xen-br0' |
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for inst in cfg['instances'].values(): |
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for nic in inst['nics']: |
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if 'bridge' not in nic: |
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nic['bridge'] = None |
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|
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cfg['cluster']['config_version'] = 3 |
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|
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# Main program |
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if __name__ == "__main__": |
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program = os.path.basename(sys.argv[0]) |
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|
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# Option parsing |
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parser = optparse.OptionParser() |
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parser.add_option('--dry-run', dest='dry_run', |
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action="store_true", |
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help="Try to do the conversion, but don't write" |
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" output file") |
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parser.add_option(FORCE_OPT) |
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parser.add_option('--verbose', dest='verbose', |
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action="store_true", |
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help="Verbose output") |
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(options, args) = parser.parse_args() |
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|
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# Option checking |
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if args: |
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cfg_file = args[0] |
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else: |
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raise Error("Configuration file not specified") |
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|
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if not options.force: |
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usertext = ("%s MUST run on the master node. Is this the master" |
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" node?" % program) |
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if not AskUser(usertext): |
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sys.exit(1) |
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config = ReadConfig(cfg_file) |
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if options.verbose: |
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import pprint |
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print "Before upgrade:" |
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pprint.pprint(config) |
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UpdateFromVersion2To3(config) |
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if options.verbose: |
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print "After upgrade:" |
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pprint.pprint(config) |
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WriteConfig(cfg_file, config) |
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print "The configuration file has been updated successfully. Please run" |
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print " gnt-cluster copyfile %s" % cfg_file |
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print "now." |
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# vim: set foldmethod=marker : |