engineyard/engineyard-serverside — pull request #96 by martinemde (2014-04-30 00:03:33+00:00)
Title: Ignore existing files on the destination server during integrate

Unicorn worker count would be copied from app master to other app servers where the worker count written by chef was different. I think we're safe to do it this way since any files modified by the user should be modified in hooks or custom chef, which will still happen during the new instance's config run or deploy hooks.