shykes/docker — pull request #45 by alexlarsson (2013-11-19 09:48:49+00:00)
Title: Implement fallback for getting the size of a container

This moves Driver.Size() to Differ.DiffSize(), removing the empty
implementations in devmapper and dummy, and renaming the one in aufs.

Then we fall back to a container.Changes() implementation in the non-aufs
case.