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Re: [PATCH v2 04/12] ref_transaction_update(): remove "have_old" parameter

From
Junio C Hamano <gitster@pobox.com>
Date
Feb 13, 2015, 18:27 UTC
Message-ID
<xmqqfva9oee7.fsf@gitster.dls.corp.google.com>
In-Reply-To
<54DE3135.7070902@alum.mit.edu>
Michael Haggerty <mhagger@alum.mit.edu> writes:
Show 20 quoted lines
> On 02/12/2015 06:32 PM, Junio C Hamano wrote:
>> On Thu, Feb 12, 2015 at 3:12 AM, Michael Haggerty <mhagger@alum.mit.edu> wrote:
>>> Instead, verify the reference's old value if and only if old_sha1 is
>>> non-NULL.
>>>
>>> ...
>>> @@ -3664,9 +3664,6 @@ int ref_transaction_update(struct ref_transaction *transaction,
>>>         if (transaction->state != REF_TRANSACTION_OPEN)
>>>                 die("BUG: update called for transaction that is not open");
>>>
>>> -       if (have_old && !old_sha1)
>>> -               die("BUG: have_old is true but old_sha1 is NULL");
>>> -
>> 
>> In the old world, old_sha1 here used to be one of
>>  (1) NULL, (2) null_sha1[], or (3) a real object name.
>> What is the rule in the new world?
> ...
>     ... If old_sha1 is NULL, then the previous
>     value is not checked.

OK. That makes it perfectly clear that removing these lines is the right thing to do.

Thanks.
Previous: Michael HaggertyNext: Michael Haggerty
Message 12 of 27 in “Allow reference values to be checked in a transaction”
  1. 00/12 Allow reference values to be checked in a transactionMichael Haggerty, Feb 12, 2015
  2. 01/12 refs: move REF_DELETING to refs.cMichael Haggerty, Feb 12, 2015
  3. 02/12 refs: remove the gap in the REF_* constant valuesMichael Haggerty, Feb 12, 2015
  4. 03/12 struct ref_update: move "have_old" into "flags"Michael Haggerty, Feb 12, 2015
  5. Stefan BellerFeb 12, 2015
  6. Junio C HamanoFeb 12, 2015
  7. Michael HaggertyFeb 17, 2015
  8. Junio C HamanoFeb 17, 2015
  9. 04/12 ref_transaction_update(): remove "have_old" parameterMichael Haggerty, Feb 12, 2015
  10. Junio C HamanoFeb 12, 2015
  11. Michael HaggertyFeb 13, 2015
  12. Junio C HamanoFeb 13, 2015
  13. 05/12 ref_transaction_delete(): remove "have_old" parameterMichael Haggerty, Feb 12, 2015
  14. 06/12 commit: add tests of commit racesMichael Haggerty, Feb 12, 2015
  15. Stefan BellerFeb 12, 2015
  16. Michael HaggertyFeb 17, 2015
  17. Junio C HamanoFeb 12, 2015
  18. Michael HaggertyFeb 17, 2015
  19. 07/12 commit: avoid race when creating orphan commitsMichael Haggerty, Feb 12, 2015
  20. Junio C HamanoFeb 12, 2015
  21. 08/12 ref_transaction_create(): check that new_sha1 is validMichael Haggerty, Feb 12, 2015
  22. 09/12 ref_transaction_delete(): check that old_sha1 is not null_sha1Michael Haggerty, Feb 12, 2015
  23. 10/12 ref_transaction_verify(): new function to check a reference's valueMichael Haggerty, Feb 12, 2015
  24. Stefan BellerFeb 12, 2015
  25. 11/12 update_ref(): improve documentationMichael Haggerty, Feb 12, 2015
  26. 12/12 refs.h: Remove duplication in function docstringsMichael Haggerty, Feb 12, 2015
  27. Junio C HamanoFeb 12, 2015

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