Re: [PATCH v3 1/2] list-objects-filter: only parse sparse OID when 'have_git_dir'

> On Mon, Sep 09, 2019 at 09:54:36AM -0400, Jeff Hostetler wrote:
> 
>> It would be nice if we could continue to let parse_list_objects_filter()
>> do the syntax checking -- that is, we can still check that we received a
>> ulong in "blob:limit:<nr>" and that "sparse:oid:<oid>" looks like a hex
>> value, for example.  Just save the actual <oid> lookup to the higher
>> layer, if and when that makes sense.
> 
> Yeah, I agree that is the right place to do syntactic checking. But I
> think we can't do much checking for the sparse-oid. We currently accept
> not just a hex oid, but any name. And I think that is useful; I should
> be able to say "master:sparse-file" and have it resolved by the remote
> side.

> 
> So it really is "any name which is syntactically resolvable as a sha1
> expression". At which point I think you might as well punt and just wait
> until we _actually_ try to resolve the name to see if it's valid.
> 
> I'll work up what I sent earlier into a real patch, and include some of
> this discussion.
> 
> -Peff
>