hooks:
  post-start:
    # Magento triggers (created with DEFINER=`db`@`%`) write to changelog tables
    # in the magento1/magento2 databases, so the `db` user needs full privileges
    # there - not just on the default `db` database.
    - exec: mysql -h db -uroot -proot -e "GRANT ALL PRIVILEGES ON magento1.* TO 'db'@'%'; GRANT ALL PRIVILEGES ON magento2.* TO 'db'@'%'; FLUSH PRIVILEGES;"