Re: [QUESTION] about .git/info/grafts file

From: Petr Baudis <pasky@suse.cz>
Date: Jan 19, 2006, 13:05 UTC
Message-ID: <20060119130519.GB28365@pasky.or.cz>
In-Reply-To: <43CF739F.2030204@op5.se>

Dear diary, on Thu, Jan 19, 2006 at 12:10:23PM CET, I got a letter where Andreas Ericsson <ae@op5.se> said that...

Show 20 quoted lines

> Junio C Hamano wrote:
> >Franck <vagabon.xyz@gmail.com> writes:
> >
> >
> >>I'm wondering why the "grafts" files is not involved during
> >>push/pull/clone operations ?
> >
> >
> >Commit ancestry grafting is a local repository issue and even if
> >you manage to lie to your local git that 300,000th commit is the
> >epoch, the commit object you send out to the downloader would
> >record its true parent (or parents, if it is a merge), so the
> >downloader would want to go further back.  And no, rewriting
> >that commit and feeding a parentless commit to the downloader is
> >not an option, because such a commit object would have different
> >object name and unpack-objects would be unhappy.
> 
> I'm a bit curious about how this was done for the public kernel repo. 
> I'd like to import glibc to git, but keeping history since 1972 seems a 
> bloody waste, really.

FWIW, with the ELinks GIT repository we just started from scratch and then converted the old CVS repository, and provided this script in contrib/grafthistory.sh:

#!/bin/sh # # Graft the ELinks development history to the current tree. # # Note that this will download about 80M.

if [ -z "`which wget 2>/dev/null`" ]; then
  echo "Error: You need to have wget installed so that I can fetch the history." >&2
  exit 1
fi

[ "$GIT_DIR" ] || GIT_DIR=.git
if ! [ -d "$GIT_DIR" ]; then
  echo "Error: You must run this from the project root (or set GIT_DIR to your .git directory)." >&2
  exit 1
fi
cd "$GIT_DIR"

echo "[grafthistory] Downloading the history" mkdir -p objects/pack cd objects/pack wget -c http://elinks.cz/elinks-history.git/objects/pack/pack-0d6c5c67aab3b9d5d9b245da5929c15d79124a48.idx wget -c http://elinks.cz/elinks-history.git/objects/pack/pack-0d6c5c67aab3b9d5d9b245da5929c15d79124a48.pack

echo "[grafthistory] Setting up the grafts" cd ../.. mkdir -p info # master echo 0f6d4310ad37550be3323fab80456e4953698bf0 06135dc2b8bb7ed2e441305bdaa82048396de633 >>info/grafts # REL_0_10 echo 43a9a406737fd22a8558c47c74b4ad04d4c92a2b 730242dcf2cdeed13eae7e8b0c5f47bb03326792 >>info/grafts

echo "[grafthistory] Refreshing the dumb server info wrt. new packs" cd .. git-update-server-info

So you checkout the ELinks repository and if you want the full history you just run this script and it does everything for you.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
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