Re: RFC: grafts generalised

From: Dmitry Potapov <dpotapov@gmail.com>
Date: Jul 2, 2008, 18:33 UTC
Message-ID: <37fcd2780807021133y3a02ca80g9647b1f0854fec2b@mail.gmail.com>
In-Reply-To: <20080702181021.GD16235@cuci.nl>

On Wed, Jul 2, 2008 at 10:10 PM, Stephen R. van den Berg <srb@cuci.nl> wrote:

Show 7 quoted lines

> Dmitry Potapov wrote:
>>On second thought, it may be not necessary. You can extract an old commit
>>object, edit it, put it into Git with a new SHA1, and then use the graft file to
>>replace all references from an old to a new one. And you will be able to see
>>changes immediately in gitk.
>
> Hmmmm, interesting thought.  That just might solve my problem.

This script is just a prove of the concept. It seems to work for me, but I don't really tested it.

=========================================== #!/bin/bash

set -e

# creating some silly repo
git init
# creating some history
for ((i=0; $i<10; i++))
do
	echo foo$i > foo$i
	git add foo$i
	git commit -m "add foo$i"
done

# run gitk to see it gitk --all &

# dump all graft info to text file git rev-list --parents --all > .git/info/grafts.tmp mv .git/info/grafts.tmp .git/info/grafts

# please choose what commit you want to edit echo while read -p 'Edit commit: ' C do C=$(git rev-parse "$C") || continue # edit commit C git cat-file commit $C > .git/COMMIT_OBJ vim .git/COMMIT_OBJ

C2=$(git hash-object -w -t commit .git/COMMIT_OBJ)

# replace all references from C to C2 sed -e 's/\<'$C'\>/'$C2'/g' < .git/info/grafts > .git/info/grafts.tmp mv .git/info/grafts.tmp .git/info/grafts done ===========================================

Dmitry