+function upgrade_to_30(){
+ echo " Add 'image_list' at 'vms' to allocate alternative images"
+ sql "ALTER TABLE vms ADD COLUMN image_list TEXT NULL COMMENT 'Alternative images' AFTER image_id;"
+ sql "INSERT INTO schema_version (version_int, version, openmano_ver, comments, date) "\
+ "VALUES (30, '0.30', '0.5.60', 'Add image_list to vms', '2018-04-24');"
+}
+function downgrade_from_30(){
+ echo " Remove back 'image_list' from 'vms' to allocate alternative images"
+ sql "ALTER TABLE vms DROP COLUMN image_list;"
+ sql "DELETE FROM schema_version WHERE version_int='30';"
+}
+