So close to having Aegir running on Arch Linux

I have very very nearly got aegir installed in Arch linux but near the end, Drush is unable to start (bootstrap) the Drupal database, so it rolls back.

The debug output is here: http://drupalbin.com/20409

It looks like line 568 is where it goes south, but maybe something prior causing the problem?

Thanks in advance for any guidance you can give. I've been documenting what I've done so will be able to contribute to the hints documentation by adding Arch Linux instructions.