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Re: [PATCH 5/6] fetch: teach independent negotiation (no packfile)

From
Junio C Hamano <gitster@pobox.com>
Date
Apr 9, 2021, 05:41 UTC
Message-ID
<xmqqczv4nhem.fsf@gitster.g>
In-Reply-To
<4696c8e901808853d17af10d5a6d95cd4711c6d5.1617929278.git.jonathantanmy@google.com>
Jonathan Tan <jonathantanmy@google.com> writes:
Show 5 quoted lines
> There are 2 code paths that do not go through fetch_refs_via_pack() that
> needed to be individually excluded: the bundle transport (excluded
> through requiring smart_options, which the bundle transport doesn't
> support) and transport helpers that do not support takeover.
> Fortunately, none of these support protocol v2.

I am a bit puzzled by this mention of "Fortunately". If one says "this shiny new feature only works with protocol v2" and "transport X does not support protocol v2", doesn't it imply that the shiny new feature cannot be used with the transport X, which is unfortunate?

I can understand "while interacting with the bundle transport, you cannot do independent negotiation, but there is nothing to negotiate with a static file that is a bundle anyway, so nothing is lost" as an explanation, though.

Show 12 quoted lines
>  Documentation/technical/protocol-v2.txt |  8 +++
>  builtin/fetch.c                         | 27 +++++++-
>  fetch-pack.c                            | 89 +++++++++++++++++++++++--
>  fetch-pack.h                            | 11 +++
>  object.h                                |  2 +-
>  t/t5701-git-serve.sh                    |  2 +-
>  t/t5702-protocol-v2.sh                  | 89 +++++++++++++++++++++++++
>  transport-helper.c                      | 10 +++
>  transport.c                             | 30 +++++++--
>  transport.h                             |  6 ++
>  upload-pack.c                           | 18 +++--
>  11 files changed, 275 insertions(+), 17 deletions(-)

It is a bit surprising that there isn't much code removed, as I expected that we'd be factoring out and reusing existing code used in negotiation for fetching into a new helper function (hence the existing codepath would lose a lot of code to be replaced by a call to a new helper function), but that is apparently not what is going on.

I'll have to revisit this step and the next step tomorrow.
Thanks.
Previous: Jonathan TanNext: Jonathan Tan
Message 13 of 33 in “Push negotiation”
  1. 0/6 Push negotiationJonathan Tan, Apr 9, 2021
  2. 1/6 fetch-pack: buffer object-format with other argsJonathan Tan, Apr 9, 2021
  3. Junio C HamanoApr 9, 2021
  4. Jonathan TanApr 9, 2021
  5. 2/6 fetch-pack: refactor process_acks()Jonathan Tan, Apr 9, 2021
  6. Junio C HamanoApr 9, 2021
  7. Derrick StoleeMay 3, 2021
  8. 3/6 fetch-pack: refactor add_haves()Jonathan Tan, Apr 9, 2021
  9. Junio C HamanoApr 9, 2021
  10. 4/6 fetch-pack: refactor command and capability writeJonathan Tan, Apr 9, 2021
  11. Junio C HamanoApr 9, 2021
  12. 5/6 fetch: teach independent negotiation (no packfile)Jonathan Tan, Apr 9, 2021
  13. Junio C HamanoApr 9, 2021
  14. Jonathan TanApr 9, 2021
  15. Derrick StoleeMay 3, 2021
  16. Derrick StoleeMay 3, 2021
  17. Jonathan TanMay 3, 2021
  18. 6/6 send-pack: support push negotiationJonathan Tan, Apr 9, 2021
  19. Derrick StoleeMay 3, 2021
  20. Jonathan TanMay 3, 2021
  21. Derrick StoleeMay 4, 2021
  22. Junio C HamanoApr 30, 2021
  23. Derrick StoleeApr 30, 2021
  24. 0/5 Push negotiationJonathan Tan, May 4, 2021
  25. 1/5 fetch-pack: refactor process_acks()Jonathan Tan, May 4, 2021
  26. 2/5 fetch-pack: refactor add_haves()Jonathan Tan, May 4, 2021
  27. 3/5 fetch-pack: refactor command and capability writeJonathan Tan, May 4, 2021
  28. 4/5 fetch: teach independent negotiation (no packfile)Jonathan Tan, May 4, 2021
  29. Junio C HamanoMay 5, 2021
  30. Derrick StoleeMay 5, 2021
  31. Junio C HamanoMay 6, 2021
  32. Derrick StoleeMay 5, 2021
  33. 5/5 send-pack: support push negotiationJonathan Tan, May 4, 2021

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