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Re: [PATCH v2 28/51] refs.c: rename ref_array -> ref_dir

From
Junio C Hamano <gitster@pobox.com>
Date
Dec 13, 2011, 23:24 UTC
Message-ID
<7vzkewt5qu.fsf@alter.siamese.dyndns.org>
In-Reply-To
<4EE7CDF2.3040408@alum.mit.edu>
Michael Haggerty <mhagger@alum.mit.edu> writes:
Show 9 quoted lines
>>> .... For example, extra refs added in builtin/clone.c is used by
>>> builtin/fetch-pack.c, meaning that the codepath that discovers and
>>> remembers these extra history anchor points and the codepath that uses
>>> them while walking the history are not localized and we would need some
>>> sort of "extra ref API" anyway. I am leaning towards this option.
> ...
> Namely, we should figure out what code wants to set extra refs and or
> wants to include extra refs in its iteration over references. The
> setters don't have to be changed, but the readers should be.

You read me correctly. That is exactly what I meant by "extra ref API" in my earlier response.

> ...  But there are so many calls to the
> for_each_ref*() family of functions that I wasn't able to determine
> exactly which should allow for extra refs and which shouldn't.
Only the ones that follow add_extra_ref() in the control flow.

builtin/clone.c adds them in setup_reference() to deal with --reference. The objects known to be complete in these repositories we borrow from need to be marked complete on our end (i.e. clone does not have to fetch) and transport_fetch_refs() that eventually goes to fetch_refs_via_pack() that calls fetch_pack() uses this information. All three for_each_ref() calls in builtin/fetch-pack.c are about "what are the objects that we know are complete?" and needs to pay attention to extra refs.

Having said that, I have a slight suspicion that you might be able to eliminate this one in clone. setup_reference() adds the reference repository to the $GIT_DIR/objects/info/alternates, and the fetch logic already knows to account for the refs in alternate repositories via insert_alternate_refs() callchain.

builtin/receive-pack.c adds them in add_alternate_refs() to deal with the repositories listed in $GIT_DIR/objects/info/alternates in the receiving end of a push. Again, the objects known to be complete in these repositories we borrow from need to be marked complete on our end, and write_head_info() in that function sends these extras together with real refs we have.

Previous: Michael HaggertyNext: Junio C Hamano
Message 45 of 79 in “ref-api-C and ref-api-D re-roll”
  1. 00/51 ref-api-C and ref-api-D re-rollmhagger@alum.mit.edu, Dec 12, 2011
  2. 01/51 struct ref_entry: document name membermhagger@alum.mit.edu, Dec 12, 2011
  3. 02/51 refs: rename "refname" variablesmhagger@alum.mit.edu, Dec 12, 2011
  4. Junio C HamanoDec 13, 2011
  5. 03/51 refs: rename parameters result -> sha1mhagger@alum.mit.edu, Dec 12, 2011
  6. 04/51 clear_ref_array(): rename from free_ref_array()mhagger@alum.mit.edu, Dec 12, 2011
  7. 05/51 is_refname_available(): remove the "quiet" argumentmhagger@alum.mit.edu, Dec 12, 2011
  8. 06/51 parse_ref_line(): add docstringmhagger@alum.mit.edu, Dec 12, 2011
  9. 07/51 add_ref(): add docstringmhagger@alum.mit.edu, Dec 12, 2011
  10. 08/51 is_dup_ref(): extract function from sort_ref_array()mhagger@alum.mit.edu, Dec 12, 2011
  11. Jeff KingDec 12, 2011
  12. Michael HaggertyDec 12, 2011
  13. Junio C HamanoDec 12, 2011
  14. Junio C HamanoDec 12, 2011
  15. Michael HaggertyDec 13, 2011
  16. Michael HaggertyDec 13, 2011
  17. 09/51 refs: change signatures of get_packed_refs() and get_loose_refs()mhagger@alum.mit.edu, Dec 12, 2011
  18. 10/51 get_ref_dir(): change signaturemhagger@alum.mit.edu, Dec 12, 2011
  19. 11/51 resolve_gitlink_ref(): improve docstringmhagger@alum.mit.edu, Dec 12, 2011
  20. 12/51 Pass a (ref_cache *) to the resolve_gitlink_*() helper functionsmhagger@alum.mit.edu, Dec 12, 2011
  21. 13/51 resolve_gitlink_ref_recursive(): change to work with struct ref_cachemhagger@alum.mit.edu, Dec 12, 2011
  22. 14/51 repack_without_ref(): remove temporarymhagger@alum.mit.edu, Dec 12, 2011
  23. 15/51 create_ref_entry(): extract function from add_ref()mhagger@alum.mit.edu, Dec 12, 2011
  24. 16/51 add_ref(): take a (struct ref_entry *) parametermhagger@alum.mit.edu, Dec 12, 2011
  25. 17/51 do_for_each_ref(): correctly terminate while processesing extra_refsmhagger@alum.mit.edu, Dec 12, 2011
  26. Junio C HamanoDec 12, 2011
  27. 18/51 do_for_each_ref_in_array(): new functionmhagger@alum.mit.edu, Dec 12, 2011
  28. 19/51 do_for_each_ref_in_arrays(): new functionmhagger@alum.mit.edu, Dec 12, 2011
  29. 20/51 repack_without_ref(): reimplement using do_for_each_ref_in_array()mhagger@alum.mit.edu, Dec 12, 2011
  30. Junio C HamanoDec 12, 2011
  31. 21/51 names_conflict(): new function, extracted from is_refname_available()mhagger@alum.mit.edu, Dec 12, 2011
  32. 22/51 names_conflict(): simplify implementationmhagger@alum.mit.edu, Dec 12, 2011
  33. 23/51 is_refname_available(): reimplement using do_for_each_ref_in_array()mhagger@alum.mit.edu, Dec 12, 2011
  34. 24/51 refs.c: reorder definitions more logicallymhagger@alum.mit.edu, Dec 12, 2011
  35. 25/51 free_ref_entry(): new functionmhagger@alum.mit.edu, Dec 12, 2011
  36. 26/51 check_refname_component(): return 0 for zero-length componentsmhagger@alum.mit.edu, Dec 12, 2011
  37. 27/51 struct ref_entry: nest the value part in a unionmhagger@alum.mit.edu, Dec 12, 2011
  38. 28/51 refs.c: rename ref_array -> ref_dirmhagger@alum.mit.edu, Dec 12, 2011
  39. Junio C HamanoDec 13, 2011
  40. Michael HaggertyDec 13, 2011
  41. Junio C HamanoDec 13, 2011
  42. Michael HaggertyDec 13, 2011
  43. Junio C HamanoDec 13, 2011
  44. Michael HaggertyDec 13, 2011
  45. Junio C HamanoDec 13, 2011
  46. Junio C HamanoDec 14, 2011
  47. Jeff KingDec 14, 2011
  48. Michael HaggertyDec 15, 2011
  49. Jeff KingDec 15, 2011
  50. Michael HaggertyJan 17, 2012
  51. Michael HaggertyFeb 10, 2012
  52. Jeff KingFeb 10, 2012
  53. Junio C HamanoFeb 10, 2012
  54. Michael HaggertyFeb 11, 2012
  55. 29/51 refs: store references hierarchicallymhagger@alum.mit.edu, Dec 12, 2011
  56. 30/51 sort_ref_dir(): do not sort if already sortedmhagger@alum.mit.edu, Dec 12, 2011
  57. Junio C HamanoDec 12, 2011
  58. 31/51 refs: sort ref_dirs lazilymhagger@alum.mit.edu, Dec 12, 2011
  59. 32/51 do_for_each_ref(): only iterate over the subtree that was requestedmhagger@alum.mit.edu, Dec 12, 2011
  60. 33/51 get_ref_dir(): keep track of the current ref_dirmhagger@alum.mit.edu, Dec 12, 2011
  61. 34/51 refs: wrap top-level ref_dirs in ref_entriesmhagger@alum.mit.edu, Dec 12, 2011
  62. 35/51 get_packed_refs(): return (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  63. 36/51 get_loose_refs(): return (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  64. 37/51 is_refname_available(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  65. 38/51 find_ref(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  66. 39/51 read_packed_refs(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  67. 40/51 add_ref(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  68. 41/51 find_containing_direntry(): use (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  69. 42/51 search_ref_dir(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  70. 43/51 add_entry(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  71. 44/51 do_for_each_ref_in_dir*(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  72. 45/51 sort_ref_dir(): take (ref_entry *) instead of (ref_dir *)mhagger@alum.mit.edu, Dec 12, 2011
  73. 46/51 struct ref_dir: store a reference to the enclosing ref_cachemhagger@alum.mit.edu, Dec 12, 2011
  74. 47/51 read_loose_refs(): take a (ref_entry *) as argumentmhagger@alum.mit.edu, Dec 12, 2011
  75. 48/51 refs: read loose references lazilymhagger@alum.mit.edu, Dec 12, 2011
  76. 49/51 is_refname_available(): query only possibly-conflicting referencesmhagger@alum.mit.edu, Dec 12, 2011
  77. 50/51 read_packed_refs(): keep track of the directory being worked inmhagger@alum.mit.edu, Dec 12, 2011
  78. 51/51 repack_without_ref(): call clear_packed_ref_cache()mhagger@alum.mit.edu, Dec 12, 2011
  79. Junio C HamanoDec 12, 2011

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