Re: Understanding pack format

From: Duy Nguyen <pclouds@gmail.com>
Date: Nov 6, 2018, 16:06 UTC
Message-ID: <CACsJy8AYtz2tjo5ZB_6Mj9MWaUnYGs4GUO2+6E6nDKiNzrJoAg@mail.gmail.com>
In-Reply-To: <CAFd4kYDcX2BOYvMg1X9zO68EfYYE6Zke_-9CGY-Yi01jCc3EPA@mail.gmail.com>

On Tue, Nov 6, 2018 at 3:23 AM Farhan Khan <khanzf@gmail.com> wrote:

> To follow-up from the other day, I have been reading the code that
> retrieves the pack entry for the past 3 days now without much success.
> But there are quite a few abstractions and I get lost half-way down
> the line.

Jeff already gave you some pointers. This is just a side note.

I think it's easier to run the code under a debugger and see what it does than just reading it. You can create a repo with just one blob to have better control over it (small packs also make it possible to examine with a hex editor in parallel), e.g.

git init foo cd foo echo hello >file git add file git repack -ad gdb --args git show :./file

then put a breakpoint in some interesting functions (perhaps one of those Jeff pointed out)

-- 
Duy