Re: [PATCH v2 1/2] CI: limit GitHub Actions to designated branches

From: Jeff King <peff@peff.net>
Date: May 7, 2020, 18:54 UTC
Message-ID: <20200507185405.GA23736@coredump.intra.peff.net>
In-Reply-To: <xmqqeerv4n0q.fsf@gitster.c.googlers.com>

On Thu, May 07, 2020 at 11:29:09AM -0700, Junio C Hamano wrote:

Show 30 quoted lines

> Jeff King <peff@peff.net> writes:
> 
> > Yeah, I agree that all of the mechanisms for dealing with the unrelated
> > history are somewhat awkward. Another issue is that you can't just:
> >
> >   git clone --single-branch -b refs/ci/config my-config
> >
> > to work on it, because "-b" wants only heads or tags (we could address
> > that by putting it in refs/heads/ci-config or similar).
> 
> I somehow don't think that it is such a huge issue, because I expect
> anybody who has legitimate interest in refs/ci/config to have a full
> clone of git.git anyway.  So it is more like defining another
> remote.origin.fetch like this:
> 
> 	 [remote "origin"]
> 	 	url = https://git.kernel.org/pub/scm/git/git.git/
> 	 	fetch = +refs/heads/*:refs/remotes/origin/*
> 	+	fetch = +refs/ci/config:refs/remotes/origin/ci-config
> 
>          [remote "publish"]
> 		url = https://github.com/user/git/
> 
> 
> and then do something like:
>     
> 	$ git worktree add -b ci-config ../git-ci-config origin/ci-config
> 	$ cd ../git-ci-config
> 	... hack hack hack ...
> 	$ git push publish ci-config:refs/ci/config

I dunno. The duality of refs/ci/config and refs/heads/ci-config is weird. Your two refspecs overlap on their RHS, and once you push up the refs/heads/ci-config you created with "git worktree add", they'll start to conflict (which maybe is OK as long as they're the same).

In the patch I sent out a few hours ago I just caved and made refs/heads/ci-config the magic ref, in order to avoid complexity.

But it also wouldn't be too bad to say "look, you can store this however you like in refs/heads/ or not at all, but install it into place with git push <remote> HEAD:refs/ci/config". The audience is git.git developers (and even advanced ones whose workflows involve tweaking their CI config), so I'd like to think they could figure it out.

I have a feeling that fewer than 5 people in the world will end up using this feature either way. ;)

-Peff