Re: [RFC] Submodules in GIT

[Jakub Narebski <jnareb@gmail.com>]

Junio C Hamano wrote:

> Linus Torvalds <torvalds@osdl.org> writes:
> 
>> Now, to get everything to work seamlessly within such a commit thing 
>> might be a fair amount of work, but I'm not sure you even _need_ to. It 
>> might be ok to just say "subproject 'xyzzy' differs" in the diff, for 
>> example, and have some rudimentary support for "git status" etc talking 
>> about subprojects that need to be committed.
> 
> I agree with the static "diff" part, and probably "checkout" and
> "merge" are not all that difficult.
> 
> However, if I recall correctly, it was rather nightmarish to
> make this also work for reachability traversal necessary for
> pack generation.  It was painful enough even when the bind was
> at the commit level (which was way simpler to handle), but to do
> this the right way, the bind needs to be done at the tree level,
> and "rev-list --objects foo..bar" would need some way to limit
> the commit ancestry chain of subproject at the same time, by
> computing the commit ancestry of the embedded commits in the
> trees.

Perhaps it would be best to join those two subproject support
solutions together: "bind" tree/commit mount header in commit
object, and "commit" entry in a tree. But I agree that revision
walking needs to be rewamped... well, unless you always have
project and subproject in the same repository, and subprojects
are branches in the project too... 

-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git