mxcl/homebrew — pull request #23768 by jacknagel (2013-10-30 05:48:01+00:00)
Title: More precise control over Resource staging

For the new patch implementation, I want to be able to fetch and verify all the patches up front, and only after that succeeds, begin unpacking and applying them.

This extracts and `unpack` method from `stage`, so that the three steps can be performed independently.