Re: Avery Pennarun's git-subtree?

From: Junio C Hamano <gitster@pobox.com>
Date: Jul 27, 2010, 21:14 UTC
Message-ID: <7v39v47hkv.fsf@alter.siamese.dyndns.org>
In-Reply-To: <AANLkTim0A0MAmpgAiaYSgYO=YbZ2gc4Upx3MQQopx6DG@mail.gmail.com>

Avery Pennarun <apenwarr@gmail.com> writes:

Show 10 quoted lines

> ...  There is one problem I don't know how to
> solve with this idea, though: what happens when commit A adds a
> submodule in modules/mod1, commit B removes it, and then commit C
> re-adds the same submodules in modules/mod1-again?  Will it reuse the
> same submodule .git directory or a new one?  Share objects or not?
> Share branch names or not?  Share .git/config or not?
>
> Unless you have some kind of "unique id" scheme for submodules, this
> gets impossible to handle correctly.  And the git objects themselves
> (trees that link to commits) have nowhere to put such things.

I vaguely recall that we already had discussed and more or less resolved it at the design level at some point. Looking for "three-level thing" in the gmane archive might be beneficial, although all I recall these three words as search keywords and do not have a detailed recollection of actual discussion ;-)