Re: Git/Mercurial interoperability (and what about bzr?) (was: Re: [VOTE] git versus mercurial)

From: Pieter de Bie <pdebie@ai.rug.nl>
Date: Oct 28, 2008, 15:33 UTC
Message-ID: <E026EBDF-F402-49AB-A7A8-0A0EFB513907@ai.rug.nl>
In-Reply-To: <Pine.LNX.4.64.0810281536360.27029@ds9.cixit.se>

On 28 okt 2008, at 15:41, Peter Krefting wrote:

Show 13 quoted lines

> It seems to me that use of DVCS is polarising between Git, Mercurial
> and Bzr. It would be nice to have easy interoperability between the
> systems, at least as far as can be covered by the lowest common
> denominator of what they support. I would love to be able to use Git  
> to
> clone a Bzr repository that I need to be able to access, since bzr is
> just different enough from Git to be annoying. Same goes for  
> Mercurial.
> And I am sure that users of the other tools feel the same.
>
> Would it be possible to design a common transfer format that could be
> implemented by all three (and that would be a little smarter than
> fast-export/fast-import)?

What would you want that the fast-export/imports are lacking? I think they are excellent tools to build some integration on.

You might want to look at my git-bzr script (http://github.com/pieter/git-bzr/tree/master ), which I created so I could use bazaar branches easily in git. It allows you to fetch a bzr branch, merge it in with your local work, and then push it out again:

	git bzr add bzr-branch ~/bazaar/something
	git bzr fetch bzr-branch
	git merge bzr/bzr-branch
	git bzr push bzr-branch

It's quite crude, but it's also only 100 lines or so and does what I need. It should also be simple enough to adapt it to also incorporate hg. When I needed the bzr integration, I looked into hg as well, but there wasn't a hg fast-import yet. If I understand dscho correctly, that exists now, so it should be easy enough to integrate that as well.

- Pieter