Re: Git -> fossil bridging?

From: Johan Herland <johan@herland.net>
Date: Nov 18, 2013, 07:17 UTC
Message-ID: <CALKQrgd9u3Oqrs8wbGqhq17=yFofFKpnFLtwfb-5A8JfVkrW7A@mail.gmail.com>
In-Reply-To: <20131117182650.1ba89a8b@bigbox.christie.dr>

On Mon, Nov 18, 2013 at 1:26 AM, Tim Chase <git@tim.thechases.com> wrote:

Show 18 quoted lines

> On 2013-11-17 14:43, Kyle J. McKay wrote:
>> Sounds like you want to write a 'git-remote-fossil' helper so you
>> can do something like:
>>
>>    git clone fossil::http://sqlite.org/src
>
> Pretty much.  Or at least something akin to git-svn where one would do
>
>   git fossil clone http://some.fossil.url/path/to/repo.fossil
>   # hack hack
>   git commit
>   # possibly some git-branch, git-merge, git-rebase, git-cherry-pick
>   # lather, rinse, repeat
>   git fossil push # or git fossil dcommit
>
> I've not played with the git+hg or git+bzr bridges to see if they'd
> have a more useful interface that would better map to fossil.  If so,
> imagine that's what I typed above ;-)

If you're looking at implementing this, please look at "git help remote-helpers" (or https://www.kernel.org/pub/software/scm/git/docs/git-remote-helpers.html ) which describes an infrastructure (in addition to fast-import/export) we have for interacting with foreign version control systems. A remote helper for fossil repos would allow you to consider the fossil repo as a git remote, and the usual git clone/fetch/pull/push commands for interacting with remote repos would Just Work against a fossil repo.

I understand how you might want to model this on "git svn", since that is obviously the most popular interface between git and an other VCS, but I believe git-svn is not the best example for how to write these gateways nowadays. git-svn was written long before git remote-helpers existed, but I hope/believe that if it was written again today, it would use remote-helpers instead of implementing its own commands.

git-remote-bzr and git-remote-hg in contrib/remote-helpers/ is the code that implements the git+bzr and git+hg bridges you mention above. Those would be useful reference points when implementing a git-remote-fossil helper. git-remote-mediawiki in contrib/mw-to-git/ might also be a useful example.

...Johan

-- 
Johan Herland, <johan@herland.net>
www.herland.net