On Tue, Jul 8, 2014 at 5:23 AM, Michael Haggerty <mhag...@alum.mit.edu> wrote:
> On 06/20/2014 04:43 PM, Ronnie Sahlberg wrote:
>> Change to use ref transactions for all updates to refs.
>>
>> Reviewed-by: Jonathan Nieder <jrnie...@gmail.com>
>> Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
>> ---
>> sequencer.c | 24 ++++++++++++++++--------
>> 1 file changed, 16 insertions(+), 8 deletions(-)
>>
>> diff --git a/sequencer.c b/sequencer.c
>> index 0a80c58..fd8acaf 100644
>> --- a/sequencer.c
>> +++ b/sequencer.c
>> @@ -272,23 +272,31 @@ static int error_dirty_index(struct replay_opts *opts)
>> static int fast_forward_to(const unsigned char *to, const unsigned char
>> *from,
>> int unborn, struct replay_opts *opts)
>> {
>> - struct ref_lock *ref_lock;
>> + struct ref_transaction *transaction;
>> struct strbuf sb = STRBUF_INIT;
>> - int ret;
>> + struct strbuf err = STRBUF_INIT;
>>
>> read_cache();
>> if (checkout_fast_forward(from, to, 1))
>> exit(1); /* the callee should have complained already */
>> - ref_lock = lock_any_ref_for_update("HEAD", unborn ? null_sha1 : from,
>> - 0, NULL);
>> - if (!ref_lock)
>> - return error(_("Failed to lock HEAD during fast_forward_to"));
>
> I think you've changed the semantics when unborn is set. Please note
> that lock_any_ref_for_update() behaves differently if old_sha1 is NULL
> (when no check is done) vs. when it is null_sha1 (when it verifies that
> the reference didn't previously exist). So when unborn is true, the old
> code verifies that the reference previously didn't exist...
>
>>
>> strbuf_addf(&sb, "%s: fast-forward", action_name(opts));
>> - ret = write_ref_sha1(ref_lock, to, sb.buf);
>> +
>> + transaction = ref_transaction_begin(&err);
>> + if (!transaction ||
>> + ref_transaction_update(transaction, "HEAD", to, from,
>> + 0, !unborn, &err) ||
>
> ...whereas when unborn is true, the new code does no check at all. I
> think you want
>
> ref_transaction_update(transaction, "HEAD",
> to, unborn ? null_sha1 : from,
> 0, 1, &err) ||
>
Right. Fixed.
Thanks.
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