From: Junio C Hamano <junkio@cox.net>
Date: Tue, 22 Nov 2005 05:24:01 GMT
Subject: Re: index manipulation -- how?
Message-ID: <7v8xvhi7bi.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <20051122050337.46450.qmail@web31808.mail.mud.yahoo.com>

Luben Tuikov <ltuikov@yahoo.com> writes:

> How do I reverse a _single_ "git-update-index" operation?
> Be it --add or just an update.

Reverting working tree files are "git checkout HEAD the-file"
(both index and working tree file from the head commit) or "git
checkout -- the-file" (working tree file from the index), but I
do not think there is a prepackaged way to revert only a single
index path offhand.

        git-ls-tree HEAD the-file |
        sed -e 's/^\([0-7]*\) [^ ]* \(.*\)/\1 \2/' |
        git-update-index --index-info

should work.

I think changing update-index --index-info so that you can lose
the sed in between without breaking its other usage (it reads
from git-apply --index-info, which does not say " blob " which
is what the sed is stripping out) is a worthwhile thing to do.