Write Yourself a Git (in Python)

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I haven’t looked closely yet, but this looks interesting: Write yourself a Git.

It’s not a joke, and it’s really not complicated: if you read this article top to bottom and write the code (or just clone the repository — but you should write the code yourself, really), you’ll end up with a program, called wyag , that will implement all the fundamental features of git: init , add , rm , status , commit , log … in a way that is perfectly compatible with git itself. The last commit of this article was actually created with wyag , not git . And all that in exactly 503 lines of very simple Python code.

Edit: here’s a related tutorial:
Build yourself a Distributed Version Control System (just like Git)

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