libgit2/libgit2 — pull request #1073 by scottjg (2012-11-15 09:16:56+00:00)
Title: DAG API (WIP)

As part of our ongoing work at GitHub to improve performance for
certain critical git ops on the site, we've been doing various
experiments which operate on the git DAG outside of the git
repository.

As I discussed with @vmg and @arrbee earlier, this change starts
to hook up an api to manipulate raw commit graphs.