Re: [PATCH v3 0/3] object-info: add option for retrieving object info

> Sometimes it is useful to get information about an object without
> having to download it completely. The server logic has already been
> implemented as “a2ba162cda (object-info: support for retrieving object
> info, 2021-04-20)”. This patch implements the client option for it.
>
> Add ‘--object-info’ option to fetch. This option allows the client to
> make an object-info command request to a server that supports protocol
> v2. If the server is v2, but does not allow for the object-info
> command request, the entire object is fetched instead and the relevant
> information is returned.
>
> Patch 1 is a small refactor. Patch 2 adds a config option for
> advertisement of object-info.  Patch 3 is the main implementation of
> fetch object-info.
>
> Major changes since v2:
>  * Added a fallback for servers that do not
>    allow object-info
>  * Refactored the fetch object-info code by moving it to fetch_refs in
>    the vtable rather than having its own function in the vtable. This
>    allows for the code to easily transition to the fallback if
>    object-info fails.
>
> Calvin Wan (3):
>   fetch-pack: refactor how packet is written to be more generic
>   objectinfo.advertise: add config option to advertise object-info
>   object-info: add option for retrieving object info
>
>  Documentation/config/transfer.txt |   4 +
>  Documentation/fetch-options.txt   |   5 ++
>  Documentation/git-fetch.txt       |   1 +
>  builtin/fetch.c                   |  36 +++++++-
>  fetch-pack.c                      |  66 ++++++++++----
>  fetch-pack.h                      |   9 ++
>  protocol-caps.c                   |  11 +++
>  protocol-caps.h                   |   6 ++
>  serve.c                           |   2 +-
>  t/t5583-fetch-object-info.sh      | 138 ++++++++++++++++++++++++++++++
>  transport-helper.c                |   8 +-
>  transport-internal.h              |   1 +
>  transport.c                       |  75 +++++++++++++++-
>  transport.h                       |   9 ++
>  14 files changed, 349 insertions(+), 22 deletions(-)
>  create mode 100755 t/t5583-fetch-object-info.sh
>
>
> base-commit: f01e51a7cfd75131b7266131b1f7540ce0a8e5c1