From: Junio C Hamano <gitster@pobox.com>
To: Rasmus Villemoes <rv@rasmusvillemoes.dk>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: recursive cloning with --reference-if-able + --dissociate
Date: Thu, 13 Feb 2020 08:18:38 -0800 [thread overview]
Message-ID: <xmqqv9oasboh.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <83602548-c0a6-db37-ccdf-5c0f4b233b2e@rasmusvillemoes.dk> (Rasmus Villemoes's message of "Thu, 13 Feb 2020 15:45:14 +0100")
Rasmus Villemoes <rv@rasmusvillemoes.dk> writes:
> At $dayjob, most of our projects are organized as a rather small
> superproject, with a number of git submodules. Usually, one of those
> submodules is a linux kernel git tree.
>
> For CI testing, we create a fresh docker container which starts by doing
> a "git clone --recursive $superproject", which takes quite a while due
> to the linux repo. So we'd like to speed that up by having a reasonable
> up-to-date linux repo on each build slave, mapping that into the docker
> container, and then telling git "when you get to cloning the src/linux
> submodule, look over here for objects", i.e. having some way to have
> --reference-if-able and --disassociate in effect for submodules.
>
> If this is already possible, I can't find it in the documentation. And
> if it doesn't exist, I can't really think of a good way to define the UI
> for giving those options (other than, perhaps, having a top-level
> --reference-if-able pass down to the submodules with the meaning 'when
> initializing the submodule at some/path, try to use the submodule, if
> any, at some/path in the referenced top-level repo'".
Sorry for not giving a full solution but I suspect that discussing
this topic will lead to a useful new feature, similar in spirit to
the url rewriting (i.e. "url.$LOCAL.insteadOf = $REMOTE") to tell
Git to use a local mirror $LOCAL instead of the remote authentic
repository when interacting with $REMOTE.
Perhaps "url.$LOCALREF.autoReference = $REMOTE" to specify a local
mirror that does not have to be completely up-to-date, that will
altomatically be used as if "--reference-if-able $LOCALREF" is
passed when running "git clone $REMOTE", or something like that.
The actual design has to get a lot more involved, including
deciding:
- if autoReference is orthogonal to --disssociate (I think it
should be but others may differ).
- how the way --dissociate is passed down from the top-level
superproject to cloning of submodules is controlled (passing
unconditionally would probably be too coarse, but I dunno).
etc. etc.
prev parent reply other threads:[~2020-02-13 16:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 14:45 recursive cloning with --reference-if-able + --dissociate Rasmus Villemoes
2020-02-13 16:18 ` Junio C Hamano [this message]
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