Re: Segfault with merge-tree on multiple Git versions

[John Keeping <john@keeping.me.uk>]

On Wed, Mar 27, 2013 at 02:16:24PM -0500, Jed Brown wrote:
> Charlie Smurthwaite <charlie@atechmedia.com> writes:
> 
> > Yes, I would need to be able to do this on a bare repo for my use case. 
> 
> And if it's on the server, you don't want this to be observable, so
> you don't want HEAD to move around. I don't know a better way than:
> 
>   $ git clone --shared -b upstream-branch bare-repo.git /tmp/merge-repo
>   $ cd /tmp/merge-repo
>   $ git pull URL incoming-branch
> 
> Cloning with --shared just writes a path into .git/objects/info/alternatives
> and it doesn't need to be on the same file system (unlike --local).
> 
> Since 'git merge-tree' just works with trees, it has less information
> than 'git merge'.

You could use a temporary index and do something like:

	rm -f TMP_INDEX
	GIT_INDEX_FILE=TMP_INDEX
	export GIT_INDEX_FILE
	git read-tree -m $base $ours $theirs &&
	git merge-index git-merge-one-file -a

then inspect that with "git diff-index --cached $ours".

Note that this will fail if there are conflicts and I don't know what
git-merge-tree will do in that case.