DB migration version

1. What is the problem
Based on the bug report https://bugs.launchpad.net/tricircle/+bug/1652708,
currently the version migrated to is fixed to 2 in cmd/manage.py.

2. What is the solution to the problem
We should use the version specified in the CLI, if no target version is
specified, then migrate the db to the latest version.

3. What the features need to be implemented to the Tricircle
No new features

Change-Id: I00703578ecd2017836be9ac6e93a4bfd784e650e

devstack/plugin.sh

@@ -153,7 +153,7 @@ if [[ "$Q_ENABLE_TRICIRCLE" == "True" ]]; then
         setup_package $TRICIRCLE_DIR -e
 
         recreate_database tricircle
-        tricircle-db-manage "$TRICIRCLE_API_CONF"
+        tricircle-db-manage --config-file="$TRICIRCLE_API_CONF" db_sync
 
         if is_service_enabled q-svc ; then
             start_central_neutron_server $CENTRAL_REGION_NAME $TRICIRCLE_NEUTRON_PORT

tricircle/cmd/manage.py

@@ -17,19 +17,52 @@
 import sys
 
 from oslo_config import cfg
+from oslo_log import log as logging
 
 from tricircle.db import core
 from tricircle.db import migration_helpers
 
+import pbr.version
+
+CONF = cfg.CONF
+
+
+def do_db_version():
+    print(migration_helpers.db_version())
+
+
+def do_db_sync():
+    migration_helpers.sync_repo(CONF.command.version)
+
+
+def add_command_parsers(subparsers):
+    parser = subparsers.add_parser('db_version')
+    parser.set_defaults(func=do_db_version)
+
+    parser = subparsers.add_parser('db_sync')
+    parser.set_defaults(func=do_db_sync)
+    parser.add_argument('version', nargs='?')
+
+command_opt = cfg.SubCommandOpt('command',
+                                title='Commands',
+                                help='Show available commands.',
+                                handler=add_command_parsers)
+
 
 def main():
     core.initialize()
-    cfg.CONF(args=sys.argv[2:],
-             project='tricircle',
-             default_config_files=[sys.argv[1]])
-    migration_helpers.find_migrate_repo()
-    migration_helpers.sync_repo(2)
+    logging.register_options(CONF)
+    logging.setup(CONF, 'tricircle-db-manage')
+    CONF.register_cli_opt(command_opt)
+    version_info = pbr.version.VersionInfo('tricircle')
 
+    try:
+        CONF(sys.argv[1:], project='tricircle', prog='tricircle-db-manage',
+             version=version_info.version_string())
+    except RuntimeError as e:
+        sys.exit("ERROR: %s" % e)
 
-if __name__ == '__main__':
-    main()
+    try:
+        CONF.command.func()
+    except Exception as e:
+        sys.exit("ERROR: %s" % e)

tricircle/db/migration_helpers.py

@@ -23,6 +23,13 @@ from tricircle.db import core
 from tricircle.db import migrate_repo
 
 
+def db_version():
+    engine = core.get_engine()
+    repo_abs_path = find_migrate_repo()
+    init_version = migrate_repo.DB_INIT_VERSION
+    return migration.db_version(engine, repo_abs_path, init_version)
+
+
 def find_migrate_repo(package=None, repo_name='migrate_repo'):
     package = package or db
     path = os.path.abspath(os.path.join(