Re: git fails to checkout SHA1 submodule in SHA256 repo with --depth=1

From: brian m. carlson <sandals@crustytoothpaste.net>
Date: Nov 12, 2025, 23:37 UTC
Message-ID: <aRUaR6IfH9imrF5A@fruit.crustytoothpaste.net>
In-Reply-To: <xmqq7bvvtdoe.fsf@gitster.g>

On 2025-11-12 at 16:32:01, Junio C Hamano wrote:

Show 12 quoted lines

> Martin Wilck <mwilck@suse.com> writes:
> 
> >> Subject: Re: git fails to checkout SHA1 submodule in SHA256 repo with --depth=1
> 
> I think it is not supposed to work to mix repositories like this,
> regardless of any other option like --depth.  I think brian gave a
> response to that effect in a thread in the past few months.
> 
>     ... goes and looks ...
> 
> https://lore.kernel.org/git/aJ5gOPQ9oologqj-@fruit.crustytoothpaste.net/
> https://lore.kernel.org/git/aKPJNNWMW9gtueEK@fruit.crustytoothpaste.net/

Yes, that isn't going to work and it never will unless we add some extension mechanism for that purpose. The repository in question is corrupt.

I've just written a patch to check for this case and produce an error in git add, which I will send shortly.

-- 
brian m. carlson (they/them)
Toronto, Ontario, CA