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Re: [PATCH 2/3] protocol v2: specify static seeding of clone/fetch via "bundle-uri"

From
Derrick Stolee <stolee@gmail.com>
Date
Oct 27, 2021, 02:01 UTC
Message-ID
<7fab28bf-54e7-d0e9-110a-53fad6244cc9@gmail.com>
In-Reply-To
<patch-2.3-3ac0539c053-20211025T211159Z-avarab@gmail.com>
On 10/25/2021 5:25 PM, Ævar Arnfjörð Bjarmason wrote:
Show 5 quoted lines
> Add a server-side implementation of a new "bundle-uri" command to
> protocol v2. As discussed in the updated "protocol-v2.txt" this will
> allow conforming clients to optionally seed their initial clones or
> incremental fetches from URLs containing "*.bundle" files created with
> "git bundle create".
...
Show 26 quoted lines
> +DISCUSSION of bundle-uri
> +^^^^^^^^^^^^^^^^^^^^^^^^
> +
> +The intent of the feature is optimize for server resource consumption
> +in the common case by changing the common case of fetching a very
> +large PACK during linkgit:git-clone[1] into a smaller incremental
> +fetch.
> +
> +It also allows servers to achieve better caching in combination with
> +an `uploadpack.packObjectsHook` (see linkgit:git-config[1]).
> +
> +By having new clones or fetches be a more predictable and common
> +negotiation against the tips of recently produces *.bundle file(s).
> +Servers might even pre-generate the results of such negotiations for
> +the `uploadpack.packObjectsHook` as new pushes come in.
> +
> +I.e. the server would anticipate that fresh clones will download a
> +known bundle, followed by catching up to the current state of the
> +repository using ref tips found in that bundle (or bundles).
> +
> +PROTOCOL for bundle-uri
> +^^^^^^^^^^^^^^^^^^^^^^^
> +
> +A `bundle-uri` request takes no arguments, and as noted above does not
> +currently advertise a capability value. Both may be added in the
> +future.

One thing I realized was missing from this proposal is any interaction with partial clone. It would be disappointing if we could not advertise bundles of commit-and-tree packfiles for blobless partial clones.

There is currently no way for the client to signal the filter type during this command. Not having any way to extend to include that seems like an oversight we should remedy before committing to a protocol that can't be extended.

(This also seems like a good enough reason to group the URIs into a struct-like storage, because the filter type could be stored next to the URI.)

Thanks, -Stolee

Previous: Ævar Arnfjörð BjarmasonNext: Ævar Arnfjörð Bjarmason
Message 8 of 77 in “bundle-uri: "dumb" static CDN offloading, spec & server implementation”
  1. 0/3 bundle-uri: "dumb" static CDN offloading, spec & server implementationÆvar Arnfjörð Bjarmason, Oct 25, 2021
  2. 1/3 leak tests: mark t5701-git-serve.sh as passing SANITIZE=leakÆvar Arnfjörð Bjarmason, Oct 25, 2021
  3. 2/3 protocol v2: specify static seeding of clone/fetch via "bundle-uri"Ævar Arnfjörð Bjarmason, Oct 25, 2021
  4. Derrick StoleeOct 26, 2021
  5. Ævar Arnfjörð BjarmasonOct 26, 2021
  6. Derrick StoleeOct 27, 2021
  7. Ævar Arnfjörð BjarmasonOct 27, 2021
  8. Derrick StoleeOct 27, 2021
  9. Ævar Arnfjörð BjarmasonOct 27, 2021
  10. Derrick StoleeOct 27, 2021
  11. Ævar Arnfjörð BjarmasonOct 27, 2021
  12. Derrick StoleeOct 27, 2021
  13. Ævar Arnfjörð BjarmasonOct 27, 2021
  14. Derrick StoleeOct 29, 2021
  15. Philip OakleyOct 30, 2021
  16. 3/3 bundle-uri client: add "bundle-uri" parsing + testsÆvar Arnfjörð Bjarmason, Oct 25, 2021
  17. Derrick StoleeOct 26, 2021
  18. Derrick StoleeOct 29, 2021
  19. Ævar Arnfjörð BjarmasonOct 30, 2021
  20. Derrick StoleeNov 1, 2021
  21. Ævar Arnfjörð BjarmasonNov 1, 2021
  22. 00/13 bundle-uri: a "dumb CDN" for gitÆvar Arnfjörð Bjarmason, Mar 11, 2022
  23. 02/13 bundle-uri docs: add design notesÆvar Arnfjörð Bjarmason, Mar 11, 2022
  24. 01/13 protocol v2: add server-side "bundle-uri" skeletonÆvar Arnfjörð Bjarmason, Mar 11, 2022
  25. 04/13 connect.c: refactor sending of agent & object-formatÆvar Arnfjörð Bjarmason, Mar 11, 2022
  26. 06/13 bundle-uri client: add "git ls-remote-bundle-uri"Ævar Arnfjörð Bjarmason, Mar 11, 2022
  27. 05/13 bundle-uri client: add minimal NOOP clientÆvar Arnfjörð Bjarmason, Mar 11, 2022
  28. 07/13 bundle-uri client: add transfer.injectBundleURI supportÆvar Arnfjörð Bjarmason, Mar 11, 2022
  29. 03/13 bundle-uri client: add "bundle-uri" parsing + testsÆvar Arnfjörð Bjarmason, Mar 11, 2022
  30. 08/13 bundle-uri client: add boolean transfer.bundleURI settingÆvar Arnfjörð Bjarmason, Mar 11, 2022
  31. 09/13 fetch-pack: add a deref_without_lazy_fetch_extended()Ævar Arnfjörð Bjarmason, Mar 11, 2022
  32. 10/13 fetch-pack: move --keep=* option filling to a functionÆvar Arnfjörð Bjarmason, Mar 11, 2022
  33. 13/13 bundle-uri: make the download program configurableÆvar Arnfjörð Bjarmason, Mar 11, 2022
  34. 11/13 bundle.h: make "fd" version of read_bundle_header() publicÆvar Arnfjörð Bjarmason, Mar 11, 2022
  35. 12/13 bundle-uri client: support for bundle-uri with "clone"Ævar Arnfjörð Bjarmason, Mar 11, 2022
  36. Derrick StoleeMar 11, 2022
  37. 00/36 bundle-uri: a "dumb CDN" for git + TOC formatÆvar Arnfjörð Bjarmason, Apr 18, 2022
  38. 01/36 connect.c: refactor sending of agent & object-formatÆvar Arnfjörð Bjarmason, Apr 18, 2022
  39. 02/36 dir API: add a generalized path_match_flags() functionÆvar Arnfjörð Bjarmason, Apr 18, 2022
  40. Derrick StoleeApr 21, 2022
  41. 03/36 fetch-pack: add a deref_without_lazy_fetch_extended()Ævar Arnfjörð Bjarmason, Apr 18, 2022
  42. Derrick StoleeApr 21, 2022
  43. 04/36 fetch-pack: move --keep=* option filling to a functionÆvar Arnfjörð Bjarmason, Apr 18, 2022
  44. 05/36 http: make http_get_file() externalÆvar Arnfjörð Bjarmason, Apr 18, 2022
  45. 07/36 remote: allow relative_url() to return an absolute urlÆvar Arnfjörð Bjarmason, Apr 18, 2022
  46. 06/36 remote: move relative_url()Ævar Arnfjörð Bjarmason, Apr 18, 2022
  47. 08/36 bundle.h: make "fd" version of read_bundle_header() publicÆvar Arnfjörð Bjarmason, Apr 18, 2022
  48. 09/36 protocol v2: add server-side "bundle-uri" skeletonÆvar Arnfjörð Bjarmason, Apr 18, 2022
  49. 10/36 bundle-uri client: add "bundle-uri" parsing + testsÆvar Arnfjörð Bjarmason, Apr 18, 2022
  50. 11/36 bundle-uri client: add minimal NOOP clientÆvar Arnfjörð Bjarmason, Apr 18, 2022
  51. 12/36 bundle-uri client: add "git ls-remote-bundle-uri"Ævar Arnfjörð Bjarmason, Apr 18, 2022
  52. 14/36 bundle-uri client: add boolean transfer.bundleURI settingÆvar Arnfjörð Bjarmason, Apr 18, 2022
  53. 15/36 bundle-uri client: support for bundle-uri with "clone"Ævar Arnfjörð Bjarmason, Apr 18, 2022
  54. 13/36 bundle-uri client: add transfer.injectBundleURI supportÆvar Arnfjörð Bjarmason, Apr 18, 2022
  55. 16/36 bundle-uri: make the download program configurableÆvar Arnfjörð Bjarmason, Apr 18, 2022
  56. 18/36 bundle: implement 'fetch' command for direct bundlesÆvar Arnfjörð Bjarmason, Apr 18, 2022
  57. 17/36 remote-curl: add 'get' capabilityÆvar Arnfjörð Bjarmason, Apr 18, 2022
  58. 19/36 bundle: parse table of contents during 'fetch'Ævar Arnfjörð Bjarmason, Apr 18, 2022
  59. 20/36 bundle: add --filter option to 'fetch'Ævar Arnfjörð Bjarmason, Apr 18, 2022
  60. 21/36 bundle: allow relative URLs in table of contentsÆvar Arnfjörð Bjarmason, Apr 18, 2022
  61. 22/36 bundle: make it easy to call 'git bundle fetch'Ævar Arnfjörð Bjarmason, Apr 18, 2022
  62. 23/36 clone: add --bundle-uri optionÆvar Arnfjörð Bjarmason, Apr 18, 2022
  63. 26/36 fetch: fetch bundles before fetching original dataÆvar Arnfjörð Bjarmason, Apr 18, 2022
  64. 25/36 bundle: only fetch bundles if timestamp is newÆvar Arnfjörð Bjarmason, Apr 18, 2022
  65. 24/36 clone: --bundle-uri cannot be combined with --depthÆvar Arnfjörð Bjarmason, Apr 18, 2022
  66. 28/36 serve: understand but do not advertise 'features' capabilityÆvar Arnfjörð Bjarmason, Apr 18, 2022
  67. 27/36 protocol-caps: implement cap_features()Ævar Arnfjörð Bjarmason, Apr 18, 2022
  68. 30/36 connect: implement get_recommended_features()Ævar Arnfjörð Bjarmason, Apr 18, 2022
  69. 29/36 serve: advertise 'features' when config existsÆvar Arnfjörð Bjarmason, Apr 18, 2022
  70. 33/36 t5601: basic bundle URI testÆvar Arnfjörð Bjarmason, Apr 18, 2022
  71. 32/36 clone: use server-recommended bundle URIÆvar Arnfjörð Bjarmason, Apr 18, 2022
  72. 31/36 transport: add connections for 'features' capabilityÆvar Arnfjörð Bjarmason, Apr 18, 2022
  73. 34/36 protocol v2: add server-side "bundle-uri" skeleton (docs)Ævar Arnfjörð Bjarmason, Apr 18, 2022
  74. 35/36 bundle-uri docs: add design notesÆvar Arnfjörð Bjarmason, Apr 18, 2022
  75. 36/36 docs: document bundle URI standardÆvar Arnfjörð Bjarmason, Apr 18, 2022
  76. Derrick StoleeApr 21, 2022
  77. Ævar Arnfjörð BjarmasonApr 22, 2022

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