fedora-infra/fedora-packages — pull request #70 by ralphbean (2014-03-01 04:05:33+00:00)
Title: Use a lockfile for yum stuff.

This will hopefully fix
https://fedorahosted.org/fedoracommunity/ticket/401

If it does, then I owe @lmacken one of these:
http://www.ratebeer.com/beer/brewdog-tokyo/107203/