Support reading from .git/objects/pack/*

[billiegoose]

A fresh clone is leaving my packfiles packed. To be fully compatible with git, we need to support reading from .pack, .idx file pairs in the .git/objects/pack directory.

[billiegoose]

The recommended workaround for now is to manually unpack the packfile into the "one-file one-object" format so that it can be understood by isomorphic-git.

git clone https://github.com/wmhilton/isomorphic-git
cd isomorphic-git
mv .git/objects/pack/* .
git unpack-objects < *.pack

[billiegoose]

Status update

The GitPackfile model can now read .pack files using the accompanying .idx file. The next step is to enhance GitObjectManager to read in just the .idx files, and look up objects from the packfile when there's a miss in the objects folder. And also to generate a .idx file during clone.

[billiegoose]

Status Update 2

This work is complete in the develop branch. GitObjectManager lazy loads packfiles to retrieve commits seamlessly.