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[PATCH v2 09/12] builtin/maintenance: fix locking race when packing refs and reflogs

From
Patrick Steinhardt <ps@pks.im>
Date
May 30, 2025, 15:08 UTC
Message-ID
<20250530-b4-pks-maintenance-ref-lock-race-v2-9-d04e2f93e51f@pks.im>
In-Reply-To
<20250530-b4-pks-maintenance-ref-lock-race-v2-0-d04e2f93e51f@pks.im>

As explained in the preceding commit, git-gc(1) knows to detach only after it has already packed references and reflogs. This is done to avoid racing around their respective lockfiles.

Adapt git-maintenance(1) accordingly and run the "pack-refs" and "reflog-expire" tasks before detaching. Note that the "gc" task has the same issue, but the fix is a bit more involved there and will thus be done in a subsequent commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 builtin/gc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/builtin/gc.c b/builtin/gc.c
index f64bae0a825..e92015887a7 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -1577,12 +1577,12 @@ static const struct maintenance_task tasks[] = {
 	},
 	[TASK_PACK_REFS] = {
 		.name = "pack-refs",
-		.after_detach = maintenance_task_pack_refs,
+		.before_detach = maintenance_task_pack_refs,
 		.auto_condition = pack_refs_condition,
 	},
 	[TASK_REFLOG_EXPIRE] = {
 		.name = "reflog-expire",
-		.after_detach = maintenance_task_reflog_expire,
+		.before_detach = maintenance_task_reflog_expire,
 		.auto_condition = reflog_expire_condition,
 	},
 	[TASK_WORKTREE_PRUNE] = {
-- 
2.50.0.rc0.604.gd4ff7b7c86.dirty
Previous: Patrick SteinhardtNext: Patrick Steinhardt
Message 26 of 71 in “builtin/maintenance: fix ref lock races when detaching”
  1. 00/11 builtin/maintenance: fix ref lock races when detachingPatrick Steinhardt, May 27, 2025
  2. 01/11 builtin/gc: use designated field initializers for maintenance tasksPatrick Steinhardt, May 27, 2025
  3. 02/11 builtin/gc: drop redundant local variablePatrick Steinhardt, May 27, 2025
  4. 03/11 builtin/maintenance: centralize configuration of explicit tasksPatrick Steinhardt, May 27, 2025
  5. 04/11 builtin/maintenance: mark "--task=" and "--schedule=" as incompatiblePatrick Steinhardt, May 27, 2025
  6. Ramsay JonesMay 27, 2025
  7. Patrick SteinhardtMay 28, 2025
  8. 05/11 builtin/maintenance: stop modifying global array of tasksPatrick Steinhardt, May 27, 2025
  9. 06/11 builtin/maintenance: extract function to run tasksPatrick Steinhardt, May 27, 2025
  10. 07/11 builtin/maintenance: fix typedef for function pointersPatrick Steinhardt, May 27, 2025
  11. 08/11 builtin/maintenance: let tasks do maintenance before and after detachPatrick Steinhardt, May 27, 2025
  12. Ramsay JonesMay 27, 2025
  13. Patrick SteinhardtMay 28, 2025
  14. 09/11 builtin/maintenance: fix locking race when packing refs and reflogsPatrick Steinhardt, May 27, 2025
  15. 11/11 builtin/maintenance: fix locking race when handling "gc" taskPatrick Steinhardt, May 27, 2025
  16. 10/11 builtin/gc: avoid global state in `gc_before_repack()`Patrick Steinhardt, May 27, 2025
  17. 00/12 builtin/maintenance: fix ref lock races when detachingPatrick Steinhardt, May 30, 2025
  18. 01/12 builtin/gc: use designated field initializers for maintenance tasksPatrick Steinhardt, May 30, 2025
  19. 02/12 builtin/gc: drop redundant local variablePatrick Steinhardt, May 30, 2025
  20. 04/12 builtin/maintenance: mark "--task=" and "--schedule=" as incompatiblePatrick Steinhardt, May 30, 2025
  21. 03/12 builtin/maintenance: centralize configuration of explicit tasksPatrick Steinhardt, May 30, 2025
  22. 05/12 builtin/maintenance: stop modifying global array of tasksPatrick Steinhardt, May 30, 2025
  23. 07/12 builtin/maintenance: fix typedef for function pointersPatrick Steinhardt, May 30, 2025
  24. 06/12 builtin/maintenance: extract function to run tasksPatrick Steinhardt, May 30, 2025
  25. 08/12 builtin/maintenance: let tasks do maintenance before and after detachPatrick Steinhardt, May 30, 2025
  26. 09/12 builtin/maintenance: fix locking race when packing refs and reflogsPatrick Steinhardt, May 30, 2025
  27. 10/12 usage: allow dying without writing an error messagePatrick Steinhardt, May 30, 2025
  28. 11/12 builtin/gc: avoid global state in `gc_before_repack()`Patrick Steinhardt, May 30, 2025
  29. 12/12 builtin/maintenance: fix locking race when handling "gc" taskPatrick Steinhardt, May 30, 2025
  30. 00/12 builtin/maintenance: fix ref lock races when detachingPatrick Steinhardt, Jun 2, 2025
  31. 01/12 builtin/gc: use designated field initializers for maintenance tasksPatrick Steinhardt, Jun 2, 2025
  32. Karthik NayakJun 2, 2025
  33. 02/12 builtin/gc: drop redundant local variablePatrick Steinhardt, Jun 2, 2025
  34. 03/12 builtin/maintenance: centralize configuration of explicit tasksPatrick Steinhardt, Jun 2, 2025
  35. 04/12 builtin/maintenance: mark "--task=" and "--schedule=" as incompatiblePatrick Steinhardt, Jun 2, 2025
  36. 05/12 builtin/maintenance: stop modifying global array of tasksPatrick Steinhardt, Jun 2, 2025
  37. 06/12 builtin/maintenance: extract function to run tasksPatrick Steinhardt, Jun 2, 2025
  38. 07/12 builtin/maintenance: fix typedef for function pointersPatrick Steinhardt, Jun 2, 2025
  39. 08/12 builtin/maintenance: split into foreground and background tasksPatrick Steinhardt, Jun 2, 2025
  40. 09/12 builtin/maintenance: fix locking race when packing refs and reflogsPatrick Steinhardt, Jun 2, 2025
  41. Kristoffer HaugsbakkJun 2, 2025
  42. Patrick SteinhardtJun 3, 2025
  43. Kristoffer HaugsbakkJun 3, 2025
  44. 10/12 usage: allow dying without writing an error messagePatrick Steinhardt, Jun 2, 2025
  45. Karthik NayakJun 3, 2025
  46. Kristoffer HaugsbakkJun 3, 2025
  47. Karthik NayakJun 3, 2025
  48. Patrick SteinhardtJun 3, 2025
  49. Kristoffer HaugsbakkJun 3, 2025
  50. Junio C HamanoJun 3, 2025
  51. Patrick SteinhardtJun 5, 2025
  52. 11/12 builtin/gc: avoid global state in `gc_before_repack()`Patrick Steinhardt, Jun 2, 2025
  53. 12/12 builtin/maintenance: fix locking race when handling "gc" taskPatrick Steinhardt, Jun 2, 2025
  54. 00/12 builtin/maintenance: fix ref lock races when detachingPatrick Steinhardt, Jun 3, 2025
  55. 01/12 builtin/gc: use designated field initializers for maintenance tasksPatrick Steinhardt, Jun 3, 2025
  56. 02/12 builtin/gc: drop redundant local variablePatrick Steinhardt, Jun 3, 2025
  57. 03/12 builtin/maintenance: centralize configuration of explicit tasksPatrick Steinhardt, Jun 3, 2025
  58. 05/12 builtin/maintenance: stop modifying global array of tasksPatrick Steinhardt, Jun 3, 2025
  59. 04/12 builtin/maintenance: mark "--task=" and "--schedule=" as incompatiblePatrick Steinhardt, Jun 3, 2025
  60. Derrick StoleeJun 5, 2025
  61. 06/12 builtin/maintenance: extract function to run tasksPatrick Steinhardt, Jun 3, 2025
  62. 07/12 builtin/maintenance: fix typedef for function pointersPatrick Steinhardt, Jun 3, 2025
  63. 08/12 builtin/maintenance: split into foreground and background tasksPatrick Steinhardt, Jun 3, 2025
  64. 09/12 builtin/maintenance: fix locking race with refs and reflogs tasksPatrick Steinhardt, Jun 3, 2025
  65. 11/12 builtin/gc: avoid global state in `gc_before_repack()`Patrick Steinhardt, Jun 3, 2025
  66. 10/12 usage: allow dying without writing an error messagePatrick Steinhardt, Jun 3, 2025
  67. 12/12 builtin/maintenance: fix locking race when handling "gc" taskPatrick Steinhardt, Jun 3, 2025
  68. Kristoffer HaugsbakkJun 3, 2025
  69. Ben KnobleJun 4, 2025
  70. Derrick StoleeJun 5, 2025
  71. Patrick SteinhardtJun 6, 2025

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