drush-ops/drush — pull request #251 by juampy72 (2013-11-06 12:53:48+00:00)
Title: User engine is not loaded at drush updb.

This makes the command to crash on Drupal 7 with the following error:

Error: Call to undefined function drush_get_user_id() in /usr/share/drush/includes/batch.inc, line 72