Commit 5625d86b994fd81f1b0d887890e8168d7b5f46cc

David Turner 2016-05-17T15:40:32

index: support index v4 Support reading and writing index v4. Index v4 uses a very simple compression scheme for pathnames, but is otherwise similar to index v3. Signed-off-by: David Turner <dturner@twitter.com>