Re: Shallow clone of a specific git revision?

From: Michal Suchánek <msuchanek@suse.de>
Date: Nov 15, 2024, 10:43 UTC
Message-ID: <Zzcl0Ql0S386G4FO@kitsune.suse.cz>
In-Reply-To: <ZzbVe79p_Zbnb6rs@gmail.com>

Hello,

On Thu, Nov 14, 2024 at 09:00:43PM -0800, David Aguilar wrote:

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> On Wed, Nov 13, 2024 at 11:29:48AM +0100, Michal Suchánek wrote:
> > On Wed, Nov 13, 2024 at 11:23:47AM +0100, Toon Claes wrote:
> > > Michal Suchánek <msuchanek@suse.de> writes:
> > > 
> > > > Hello,
> > > >
> > > > Looking through clone man page it supports shallow clones of branches
> > > > and tags only.
> > > >
> > > > Would it be possible to do shallow clone of a specific revision,
> > > > and checkout specific revision on clone?
> > > 
> > > Hi Michal,
> > > 
> > > I'm working on a patch, and I've submitted a first version [1] a little
> > > while ago to allow users to pass a reference on git-clone(1). Would this
> > > change fit your needs, or what else would you like to support?
> > 
> > > [1]: https://lore.kernel.org/git/20240927085438.1010431-1-toon@iotcl.com/
> > 
> > Hello,
> > 
> > that slightly expands the available options but it does not make it
> > possible to clone an arbitrary revision, ie. specified by a SHA
> > 
> > Thanks
> > 
> > Michal
> 
> In case it helps, here's a short recipe demonstrating how to do a

Yes, that's helpful, thanks.

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> shallow "clone" of a specific commit ID:
> 
>     git init the-repo
>     cd ./the-repo
>     git remote add origin <url>
>     git fetch --depth=1 origin <commit-id>
>     git checkout <commit-id>
> 
> It'd be nice to add this feature to "git clone" for convenience.

This is how many git reatures start, after all. They are provided as a script on top of core git functionality.

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> This recipe depends on the server's configuration. You must have one of
> the following configuration variables set "true" server-side in order
> for the server to accept requests for arbitrary commit IDs:
> 
>     uploadpack.allowReachableSHA1InWant
>         Allow upload-pack to accept a fetch request that asks for an
>         object that is reachable from any ref tip. However, note that
>         calculating object reachability is computationally expensive.
>         Defaults to false. Even if this is false, a client may be able
>         to steal objects via the techniques described in the "SECURITY"
>         section of the gitnamespaces(7) man page; it’s best to keep
>         private data in a separate repository.
> 
>     uploadpack.allowAnySHA1InWant
>         Allow upload-pack to accept a fetch request that asks for any
>         object at all. Defaults to false.

I would be fetching from a forge most of the time which would use its own implementation of git server most of the time but it's good to know what the options are on the canonical implementation at least.

Thanks

Michal