On Tue, Oct 26 2021, Derrick Stolee wrote:

On 10/26/2021 11:00 AM, Ævar Arnfjörð Bjarmason wrote:

[I'll reply to the rest later, either here or in related threads. I.e. I
might end up entirely revamping the config etc. format]

quoted

There's also the small matter of it being consistent with the
packfile-uri config in its current form, but that shouldn't be a reason
not to come up with something better. If anything any better suggestion
(if we go for that) could be supported by it too...

What do you mean about being consistent with packfile-uri? This layer
that we care about isn't even implemented in git.git.

It's rather limited, but we do support a uploadpack.BlobPackFileUri as a
server-side feature for upload-pack. I.e.:

    uploadpack.BlobPackFileUri=<OID> <pack-hash> <packfile-uri>

See Documentation/technical/packfile-uri.txt.

The <pack-hash> is part of the protocol, but the <OID> is just an aid to
upload-pack to peel out that OID when it serves up the PACK, the <OID>
being what you get from the URI.

In terms of server implementation it's rather proof-of-concept-ish,
i.e. it's not really all that useful unless your use case is carving out
a small number of really big blobs. JGit's is much more mature, and
there's some patches on-list recently to make the git.git one more
practically useful[1].

1. https://lore.kernel.org/git/cover.1634634814.git.tenglong@alibaba-inc.com/ (local)