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Re: [PATCH 6/6] Retain caches of submodule refs

From
Junio C Hamano <gitster@pobox.com>
Date
Oct 9, 2011, 20:10 UTC
Message-ID
<7v39f2rko5.fsf@alter.siamese.dyndns.org>
In-Reply-To
<4E918194.5060102@alum.mit.edu>
Michael Haggerty <mhagger@alum.mit.edu> writes:
Show 8 quoted lines
> So I think I need help from a submodule guru (Heiko?) who can tell me
> what is done with submodule references and whether they might be
> modified while a git process is executing in the main module.  If so,
> then either this patch has to be withdrawn, or more work has to be put
> in to make such code invalidate the submodule reference cache.
>
> Sorry for the oversight, but I forgot that not all code necessarily uses
> the refs.c API when dealing with references (a regrettable situation, BTW).

In the longer term, I would agree with you that we very much prefer all the ref accesses to go through the refs API, and I also foresee that the submodule support would need to become more aware of the status of refs in checked out submodules. For example, a recursive "submodule update" may want to inspect the refs in a submodule directory, compare them with the commit bound in the superproject tree for the submodule path, and decide to spawn a "fetch && checkout $branch" in there. The same process then may want to run "status" at the superproject level to show the result, which in turn would inspect the relationship between the commit bound in the superproject tree and the commit at the HEAD of the submodule directory.

So let's not rip out the commit but instead give submodule machinery an explicit way to say "We do not know the current status of the refs in this submodule anymore".

Thanks.
Previous: Michael HaggertyNext: Michael Haggerty
Message 17 of 54 in “Retain caches of submodule refs”
  1. 0/6 Retain caches of submodule refsMichael Haggerty, Aug 12, 2011
  2. 1/6 Extract a function clear_cached_refs()Michael Haggerty, Aug 12, 2011
  3. 2/6 Access reference caches only through new function get_cached_refs().Michael Haggerty, Aug 12, 2011
  4. Junio C HamanoAug 14, 2011
  5. Michael HaggertyAug 23, 2011
  6. 3/6 Change the signature of read_packed_refs()Michael Haggerty, Aug 12, 2011
  7. 4/6 Allocate cached_refs objects dynamicallyMichael Haggerty, Aug 12, 2011
  8. Junio C HamanoAug 14, 2011
  9. 5/6 Store the submodule name in struct cached_refs.Michael Haggerty, Aug 12, 2011
  10. 6/6 Retain caches of submodule refsMichael Haggerty, Aug 12, 2011
  11. Heiko VoigtAug 13, 2011
  12. Michael HaggertyAug 24, 2011
  13. Heiko VoigtAug 24, 2011
  14. Junio C HamanoAug 16, 2011
  15. Michael HaggertyAug 24, 2011
  16. Michael HaggertyOct 9, 2011
  17. Junio C HamanoOct 9, 2011
  18. 0/2 Provide API to invalidate refs cacheMichael Haggerty, Oct 10, 2011
  19. 1/2 invalidate_cached_refs(): take the submodule as parameterMichael Haggerty, Oct 10, 2011
  20. 2/2 invalidate_cached_refs(): expose this function in refs APIMichael Haggerty, Oct 10, 2011
  21. 0/7 Provide API to invalidate refs cacheMichael Haggerty, Oct 10, 2011
  22. 1/7 invalidate_ref_cache(): rename function from invalidate_cached_refs()Michael Haggerty, Oct 10, 2011
  23. Junio C HamanoOct 11, 2011
  24. Michael HaggertyOct 11, 2011
  25. 2/7 invalidate_ref_cache(): take the submodule as parameterMichael Haggerty, Oct 10, 2011
  26. 3/7 invalidate_ref_cache(): expose this function in refs APIMichael Haggerty, Oct 10, 2011
  27. 4/7 clear_cached_refs(): rename parameterMichael Haggerty, Oct 10, 2011
  28. 5/7 clear_cached_refs(): extract two new functionsMichael Haggerty, Oct 10, 2011
  29. 6/7 write_ref_sha1(): only invalidate the loose ref cacheMichael Haggerty, Oct 10, 2011
  30. 7/7 clear_cached_refs(): inline functionMichael Haggerty, Oct 10, 2011
  31. Junio C HamanoOct 11, 2011
  32. Michael HaggertyOct 11, 2011
  33. Julian PhillipsOct 11, 2011
  34. Junio C HamanoOct 11, 2011
  35. 0/7 Provide API to invalidate refs cacheMichael Haggerty, Oct 12, 2011
  36. 1/7 invalidate_ref_cache(): rename function from invalidate_cached_refs()Michael Haggerty, Oct 12, 2011
  37. Junio C HamanoOct 12, 2011
  38. Michael HaggertyOct 12, 2011
  39. 2/7 invalidate_ref_cache(): take the submodule as parameterMichael Haggerty, Oct 12, 2011
  40. Junio C HamanoOct 12, 2011
  41. Michael HaggertyOct 12, 2011
  42. Junio C HamanoOct 17, 2011
  43. Michael HaggertyNov 3, 2011
  44. Junio C HamanoNov 3, 2011
  45. 3/7 invalidate_ref_cache(): expose this function in refs APIMichael Haggerty, Oct 12, 2011
  46. 4/7 clear_cached_refs(): rename parameterMichael Haggerty, Oct 12, 2011
  47. 5/7 clear_cached_refs(): extract two new functionsMichael Haggerty, Oct 12, 2011
  48. 6/7 write_ref_sha1(): only invalidate the loose ref cacheMichael Haggerty, Oct 12, 2011
  49. 7/7 clear_cached_refs(): inline functionMichael Haggerty, Oct 12, 2011
  50. Junio C HamanoOct 12, 2011
  51. Heiko VoigtOct 10, 2011
  52. Michael HaggertyOct 11, 2011
  53. Heiko VoigtOct 11, 2011
  54. Heiko VoigtAug 13, 2011

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