This tutorial takes a deep dive into the internals of everyone's favorite source control system, git. It assumes that you are familiar with using git (e.g. commits, branches, tags), and we'll take a look at the internals of git and how it works, and in particular, its file formats.

• git as a content-addressable store
  We look at how git works at its lowest level, as a content-addressable store.

• How git implements source control
  We look at how git uses its content-addressable store to implement source control.

• Packs
  We look at how git compresses its content into packs.

• Delta objects
  We look at how git compresses its content even more by using deltas.

• Pack indexes
  We look at how git uses an index to speed up access into packs.

• Retrieving objects from a repo
  We look at how to retrieve an arbitrary object from a repo, whether it be a loose object or in a pack.

• Delta objects in other packs
  We look at reconstructing pack objects that have a base object in another pack.

• The staging index
  We look at how git stores what's currently in the staging index.

• git references
  We look at how git manages references (refs).

• git logs
  We look at how git maintains a history of ref activity.

• Wrapping up
  We beef up the scripts, and add code to verify what they're doing.