From: Nguyen Thai Ngoc Duy <pclouds@gmail.com>
Date: Tue, 31 Aug 2010 22:12:03 GMT
Subject: Re: [PATCH] Technical details about the index file format.
Message-ID: <AANLkTiktRqX+fhFW3mN_b5tnbKzDJY86fLpKVth7RpY9@mail.gmail.com>
In-Reply-To: <1202711335-12026-1-git-send-email-robin.rosenberg@dewire.com>

On Mon, Feb 11, 2008 at 5:28 PM, Robin Rosenberg
<robin.rosenberg@dewire.com> wrote:
> +     4 byte version number:
> +       The current version is 2

The version could be 3 if extended flags are used.

> +     A 16-bit field split into (high to low bits)
> +
> +       1-bit assume-valid flag
> +
> +       1-bit update-needed flag

I think this bit is CE_EXTENDED, an indication that this entry has
extended flags

> +
> +       2-bit stage (during merge)
> +
> +       12-bit name length

     A 16-bit field additional flags (high to low bits), only
applicable to version 3

       1-bit reserved for future

       1-bit skip-worktree flag

       1-bit intent-to-add flag (aka "git add -N")

> +  - Extensions
> +
> +    The only know index extension today is a tree cache.

There's also "REUC" extension from read-cache.c. I personally have
never touched it, so no comments.
-- 
Duy