41b4490a41
implements blueprint quantum-db-upgrades This changeset provide database migration capabilities to Quantum by wrapping the Alembic library. Change-Id: I8ba3a07f5a65e0fda9c0e85ed9c07c5978c53bc7
129 lines
3.9 KiB
Python
129 lines
3.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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# @author: Mark McClain, DreamHost
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import os
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import sys
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from alembic import command as alembic_command
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from alembic import config as alembic_config
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from alembic import util as alembic_util
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from quantum import manager
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from quantum.openstack.common import cfg
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_core_opts = [
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cfg.StrOpt('core_plugin',
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default='',
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help='Quantum plugin provider module'),
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]
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_quota_opts = [
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cfg.StrOpt('quota_driver',
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default='',
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help='Quantum quota driver class'),
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]
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_db_opts = [
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cfg.StrOpt('sql_connection',
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default='',
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help='URL to database'),
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]
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_cmd_opts = [
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cfg.StrOpt('message',
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short='m',
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default='',
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help="Message string to use with 'revision'"),
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cfg.BoolOpt('autogenerate',
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default=False,
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help=("Populate revision script with candidate "
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"migration operations, based on comparison "
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"of database to model.")),
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cfg.BoolOpt('sql',
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default=False,
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help=("Don't emit SQL to database - dump to "
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"standard output/file instead")),
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cfg.IntOpt('delta',
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default=0,
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help='Number of relative migrations to upgrade/downgrade'),
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]
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CONF = cfg.CommonConfigOpts()
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CONF.register_opts(_core_opts)
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CONF.register_opts(_db_opts, 'DATABASE')
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CONF.register_opts(_quota_opts, 'QUOTAS')
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CONF.register_cli_opts(_cmd_opts)
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def main():
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config = alembic_config.Config(
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os.path.join(os.path.dirname(__file__), 'alembic.ini')
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)
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config.set_main_option('script_location',
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'quantum.db.migration:alembic_migrations')
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# attach the Quantum conf to the Alembic conf
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config.quantum_config = CONF
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cmd, args, kwargs = process_argv(sys.argv)
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try:
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getattr(alembic_command, cmd)(config, *args, **kwargs)
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except alembic_util.CommandError, e:
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alembic_util.err(str(e))
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def process_argv(argv):
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positional = CONF(argv)
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if len(positional) > 1:
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cmd = positional[1]
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revision = positional[2:] and positional[2:][0]
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args = ()
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kwargs = {}
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if cmd == 'stamp':
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args = (revision,)
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kwargs = {'sql': CONF.sql}
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elif cmd in ('current', 'history'):
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pass # these commands do not require additional args
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elif cmd in ('upgrade', 'downgrade'):
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if CONF.delta:
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revision = '%s%d' % ({'upgrade': '+', 'downgrade': '-'}[cmd],
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CONF.delta)
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elif not revision:
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raise SystemExit(
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_('You must provide a revision or relative delta')
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)
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args = (revision,)
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kwargs = {'sql': CONF.sql}
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elif cmd == 'revision':
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kwargs = {
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'message': CONF.message,
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'autogenerate': CONF.autogenerate,
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'sql': CONF.sql}
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elif cmd == 'check_migration':
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cmd = 'branches'
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else:
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raise SystemExit(_('Unrecognized Command: %s') % cmd)
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return cmd, args, kwargs
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else:
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raise SystemExit(_('You must provide a sub-command'))
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