Init separate alembic migration chain

Change-Id: Iad845a5771cf2503f1135e0a3a92f7bcc807a275

neutron_vpnaas/db/migration/alembic.ini

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+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic_migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# max length of characters to apply to the
+# "slug" field
+#truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

neutron_vpnaas/db/migration/alembic_migrations/README

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+Generic single-database configuration.

neutron_vpnaas/db/migration/alembic_migrations/env.py

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+# Copyright 2014 OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from logging import config as logging_config
+
+from alembic import context
+from neutron.db import model_base
+from oslo.config import cfg
+from oslo.db.sqlalchemy import session
+import sqlalchemy as sa
+from sqlalchemy import event
+
+
+MYSQL_ENGINE = None
+VPNAAS_VERSION_TABLE = 'alembic_version_vpnaas'
+config = context.config
+neutron_config = config.neutron_config
+logging_config.fileConfig(config.config_file_name)
+target_metadata = model_base.BASEV2.metadata
+
+
+def set_mysql_engine():
+    try:
+        mysql_engine = neutron_config.command.mysql_engine
+    except cfg.NoSuchOptError:
+        mysql_engine = None
+
+    global MYSQL_ENGINE
+    MYSQL_ENGINE = (mysql_engine or
+                    model_base.BASEV2.__table_args__['mysql_engine'])
+
+
+def run_migrations_offline():
+    set_mysql_engine()
+
+    kwargs = dict()
+    if neutron_config.database.connection:
+        kwargs['url'] = neutron_config.database.connection
+    else:
+        kwargs['dialect_name'] = neutron_config.database.engine
+    kwargs['version_table'] = VPNAAS_VERSION_TABLE
+    context.configure(**kwargs)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+@event.listens_for(sa.Table, 'after_parent_attach')
+def set_storage_engine(target, parent):
+    if MYSQL_ENGINE:
+        target.kwargs['mysql_engine'] = MYSQL_ENGINE
+
+
+def run_migrations_online():
+    set_mysql_engine()
+    engine = session.create_engine(neutron_config.database.connection)
+
+    connection = engine.connect()
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        version_table=VPNAAS_VERSION_TABLE
+    )
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+        engine.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

neutron_vpnaas/db/migration/alembic_migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

neutron_vpnaas/db/migration/alembic_migrations/versions/HEAD

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+start_neutron_vpnaas

neutron_vpnaas/db/migration/alembic_migrations/versions/start_neutron_vpnaas.py

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+# Copyright 2014 OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
+"""start neutron-vpnaas chain
+
+Revision ID: start_neutron_vpnaas
+Revises: None
+Create Date: 2014-12-09 18:50:01.946832
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'start_neutron_vpnaas'
+down_revision = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass