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Re: [PATCH v11 06/41] refs.c: add an err argument to repack_without_refs

From
Jonathan Nieder <jrnieder@gmail.com>
Date
May 28, 2014, 00:11 UTC
Message-ID
<20140528001117.GH12314@google.com>
In-Reply-To
<1401222360-21175-7-git-send-email-sahlberg@google.com>
Hi,
Comments from http://marc.info/?l=git&m=140079653930751&w=2:
Ronnie Sahlberg wrote:
Show 8 quoted lines
> --- a/cache.h
> +++ b/cache.h
> @@ -559,6 +559,8 @@ struct lock_file {
>  #define LOCK_DIE_ON_ERROR 1
>  #define LOCK_NODEREF 2
>  extern int unable_to_lock_error(const char *path, int err);
> +extern void unable_to_lock_strbuf(const char *path, int err,
> +				  struct strbuf *buf);

"unable_to_lock_strbuf" could be called "unable_to_lock_message" (which would make its behavior more obvious IMHO).

[...]
Show 7 quoted lines
> --- a/refs.c
> +++ b/refs.c
> @@ -2208,6 +2208,7 @@ int commit_packed_refs(void)
>  	struct packed_ref_cache *packed_ref_cache =
>  		get_packed_ref_cache(&ref_cache);
>  	int error = 0;
> +	int save_errno = 0;

This is about making errno meaningful when commit_packed_refs returns an error. Probably its API documentation should say so to make it obvious when people modify it in the future that they should preserve that property or audit callers.

[...]
Show 10 quoted lines
> @@ -2444,6 +2448,11 @@ static int repack_without_refs(const char **refnames, int n)
>  		return 0; /* no refname exists in packed refs */
>  
>  	if (lock_packed_refs(0)) {
> +		if (err) {
> +			unable_to_lock_strbuf(git_path("packed-refs"), errno,
> +					      err);
> +			return -1;
> +		}
>  		unable_to_lock_error(git_path("packed-refs"), errno);

Via the new call to unable_to_lock_..., repack_without_refs cares about errno after a failed call to lock_packed_refs. lock_packed_refs can only fail in hold_lock_file_for_update. hold_lock_file_for_update is a thin wrapper around lockfile.c::lock_file. lock_file can error out because

	strlen(path) >= max_path_len
	adjust_shared_perm failed [calls error(), clobbers errno]
	open failed

So lock_file needs a similar kind of fix, and it's probably worth updating API documentation for these calls to make it clear that their errno is used (though that's not a new problem since repack_without_refs already called unable_to_lock_error). Could be a separate, earlier patch (or a TODO comment in this patch to be addressed with a later patch) since it's fixing an existing bug.

Hope that helps, Jonathan

Previous: Ronnie SahlbergNext: Ronnie Sahlberg
Message 9 of 89 in “Use ref transactions”
  1. 00/41 Use ref transactionsRonnie Sahlberg, May 27, 2014
  2. 01/41 refs.c: remove ref_transaction_rollbackRonnie Sahlberg, May 27, 2014
  3. 02/41 refs.c: ref_transaction_commit should not free the transactionRonnie Sahlberg, May 27, 2014
  4. Jonathan NiederMay 27, 2014
  5. 03/41 refs.c: constify the sha arguments for ref_transaction_create|delete|updateRonnie Sahlberg, May 27, 2014
  6. 04/41 refs.c: allow passing NULL to ref_transaction_freeRonnie Sahlberg, May 27, 2014
  7. 05/41 refs.c: add a strbuf argument to ref_transaction_commit for error loggingRonnie Sahlberg, May 27, 2014
  8. 06/41 refs.c: add an err argument to repack_without_refsRonnie Sahlberg, May 27, 2014
  9. Jonathan NiederMay 28, 2014
  10. Ronnie SahlbergMay 28, 2014
  11. Jonathan NiederMay 28, 2014
  12. 07/41 refs.c: make ref_update_reject_duplicates take a strbuf argument for errorsRonnie Sahlberg, May 27, 2014
  13. 08/41 refs.c: add an err argument to delete_ref_looseRonnie Sahlberg, May 27, 2014
  14. Jonathan NiederMay 28, 2014
  15. Ronnie SahlbergMay 28, 2014
  16. 09/41 refs.c: make update_ref_write update a strbuf on failureRonnie Sahlberg, May 27, 2014
  17. 10/41 update-ref.c: log transaction error from the update_refRonnie Sahlberg, May 27, 2014
  18. Jonathan NiederMay 28, 2014
  19. Ronnie SahlbergMay 28, 2014
  20. Jonathan NiederMay 28, 2014
  21. 11/41 refs.c: remove the onerr argument to ref_transaction_commitRonnie Sahlberg, May 27, 2014
  22. 12/41 refs.c: change ref_transaction_update() to do error checking and return statusRonnie Sahlberg, May 27, 2014
  23. 13/41 refs.c: change ref_transaction_create to do error checking and return statusRonnie Sahlberg, May 27, 2014
  24. Jonathan NiederMay 28, 2014
  25. Ronnie SahlbergMay 28, 2014
  26. Jonathan NiederMay 28, 2014
  27. Ronnie SahlbergMay 28, 2014
  28. Jonathan NiederMay 28, 2014
  29. Ronnie SahlbergMay 28, 2014
  30. Jonathan NiederMay 28, 2014
  31. 14/41 refs.c: update ref_transaction_delete to check for error and return statusRonnie Sahlberg, May 27, 2014
  32. Jonathan NiederMay 28, 2014
  33. 15/41 refs.c: make ref_transaction_begin take an err argumentRonnie Sahlberg, May 27, 2014
  34. 16/41 refs.c: add transaction.status and track OPEN/CLOSED/ERRORRonnie Sahlberg, May 27, 2014
  35. Jonathan NiederMay 28, 2014
  36. Ronnie SahlbergMay 28, 2014
  37. 17/41 tag.c: use ref transactions when doing updatesRonnie Sahlberg, May 27, 2014
  38. 18/41 replace.c: use the ref transaction functions for updatesRonnie Sahlberg, May 27, 2014
  39. 19/41 commit.c: use ref transactions for updatesRonnie Sahlberg, May 27, 2014
  40. 20/41 sequencer.c: use ref transactions for all ref updatesRonnie Sahlberg, May 27, 2014
  41. Jonathan NiederMay 28, 2014
  42. 21/41 fast-import.c: change update_branch to use ref transactionsRonnie Sahlberg, May 27, 2014
  43. Jonathan NiederMay 28, 2014
  44. 22/41 branch.c: use ref transaction for all ref updatesRonnie Sahlberg, May 27, 2014
  45. 23/41 refs.c: change update_ref to use a transactionRonnie Sahlberg, May 27, 2014
  46. Jonathan NiederMay 28, 2014
  47. Ronnie SahlbergMay 28, 2014
  48. 24/41 receive-pack.c: use a reference transaction for updating the refsRonnie Sahlberg, May 27, 2014
  49. 25/41 fast-import.c: use a ref transaction when dumping tagsRonnie Sahlberg, May 27, 2014
  50. Jonathan NiederMay 28, 2014
  51. Ronnie SahlbergMay 28, 2014
  52. Jonathan NiederMay 28, 2014
  53. Ronnie SahlbergMay 28, 2014
  54. Jonathan NiederMay 28, 2014
  55. Ronnie SahlbergMay 29, 2014
  56. Jonathan NiederMay 29, 2014
  57. Ronnie SahlbergJun 3, 2014
  58. 26/41 walker.c: use ref transaction for ref updatesRonnie Sahlberg, May 27, 2014
  59. Jonathan NiederMay 28, 2014
  60. Ronnie SahlbergMay 28, 2014
  61. 27/41 refs.c: make lock_ref_sha1 staticRonnie Sahlberg, May 27, 2014
  62. 28/41 refs.c: remove the update_ref_lock functionRonnie Sahlberg, May 27, 2014
  63. 29/41 refs.c: remove the update_ref_write functionRonnie Sahlberg, May 27, 2014
  64. Jonathan NiederMay 28, 2014
  65. 30/41 refs.c: remove lock_ref_sha1Ronnie Sahlberg, May 27, 2014
  66. 31/41 refs.c: make prune_ref use a transaction to delete the refRonnie Sahlberg, May 27, 2014
  67. Jonathan NiederMay 28, 2014
  68. Ronnie SahlbergMay 28, 2014
  69. 32/41 refs.c: make delete_ref use a transactionRonnie Sahlberg, May 27, 2014
  70. Jonathan NiederMay 30, 2014
  71. Ronnie SahlbergJun 3, 2014
  72. 33/41 refs.c: pass the ref log message to _create/delete/update instead of _commitRonnie Sahlberg, May 27, 2014
  73. Jonathan NiederMay 30, 2014
  74. Ronnie SahlbergJun 3, 2014
  75. 34/41 refs.c: pass NULL as *flags to read_ref_fullRonnie Sahlberg, May 27, 2014
  76. 35/41 refs.c: pack all refs before we start to rename a refRonnie Sahlberg, May 27, 2014
  77. Jonathan NiederMay 30, 2014
  78. Ronnie SahlbergJun 3, 2014
  79. 36/41 refs.c: move the check for valid refname to lock_ref_sha1_basicRonnie Sahlberg, May 27, 2014
  80. Jonathan NiederMay 30, 2014
  81. Ronnie SahlbergJun 3, 2014
  82. 37/41 refs.c: call lock_ref_sha1_basic directly from commitRonnie Sahlberg, May 27, 2014
  83. 38/41 refs.c: pass a skip list to name_conflict_fnRonnie Sahlberg, May 27, 2014
  84. 39/41 refs.c: propagate any errno==ENOTDIR from _commit back to the callersRonnie Sahlberg, May 27, 2014
  85. Jonathan NiederMay 31, 2014
  86. Ronnie SahlbergJun 3, 2014
  87. 40/41 fetch.c: change s_update_ref to use a ref transactionRonnie Sahlberg, May 27, 2014
  88. 41/41 refs.c: make write_ref_sha1 staticRonnie Sahlberg, May 27, 2014
  89. Jonathan NiederJun 3, 2014

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