Re: [RFC] Submodules in GIT

From: Andy Parkins <andyparkins@gmail.com>
Date: Dec 2, 2006, 10:04 UTC
Message-ID: <200612021004.22236.andyparkins@gmail.com>
In-Reply-To: <20061201220821.GL18810@admingilde.org>

On Friday 2006, December 01 22:08, Martin Waitz wrote:

Show 5 quoted lines

> > echo $SUBMODULE_HASH >
> > submodule/.git/refs/supermodules/commit$SUPERMODULE_HASH
>
> I guess you are aware that you have to scan _all_ trees inside _all_
> supermodule commits for possible references.

No you don't; you do it as part of the appropriate normal operations.

 * supermodule commit - scan the current tree for "link" objects in the
   tree.  If you find one write the reference in the submodule.
 * adding a new submodule - if this is a new submodule there can't be any
   references in the supermodule already.
 * cloning a supermodule, every new commit that gets written in the 
   supermodule gets checked from "link" objects.

> So what do you do with deleted submodules?
> You wouldn't want them to still sit around in your working directory,
> but you still have to preserve them.

Now that is a tricky one. Mind you, I think that problem exists for any implementation. I haven't got a good answer for that.

Andy

-- 
Dr Andrew Parkins, M Eng (Hons), AMIEE