On Thu, May 15, 2014 at 12:34 PM, Jonathan Nieder <jrnieder@xxxxxxxxx> wrote:
> Ronnie Sahlberg wrote:
>
>> Update ref_transaction_update() do some basic error checking and return
>> non-zero on error. Update all callers to check ref_transaction_update() for
>> error. There are currently no conditions in _update that will return error but
>> there will be in the future.
>
> Probably worth passing a 'struct strbuf *err' argument. Then callers
> can do
>
> die("%s", err.buf);
>
Done.
> and the error message can say which ref and whether we were trying to
> create a ref, or delete one, or whatever.
>
>> --- a/builtin/update-ref.c
>> +++ b/builtin/update-ref.c
>> @@ -197,8 +197,9 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
>> if (*next != line_termination)
>> die("update %s: extra input: %s", refname, next);
>>
>> - ref_transaction_update(transaction, refname, new_sha1, old_sha1,
>> - update_flags, have_old);
>> + if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
>> + update_flags, have_old))
>> + die("update %s: failed", refname);
>
> This could say
>
> die("update %s: %s", refname, err.buf);
Done.
>
> to give context about which command it was trying to execute.
>
> [...]
>> @@ -286,8 +287,9 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
>> if (*next != line_termination)
>> die("verify %s: extra input: %s", refname, next);
>>
>> - ref_transaction_update(transaction, refname, new_sha1, old_sha1,
>> - update_flags, have_old);
>> + if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
>> + update_flags, have_old))
>> + die("failed transaction update for %s", refname);
>
> And this could say
>
> die("verify %s: %s", refname, err.buf);
Done.
>
> [...]
>> --- a/refs.h
>> +++ b/refs.h
>> @@ -242,12 +242,15 @@ void ref_transaction_rollback(struct ref_transaction *transaction);
>> * be deleted. If have_old is true, then old_sha1 holds the value
>> * that the reference should have had before the update, or zeros if
>> * it must not have existed beforehand.
>> + * Function returns 0 on success and non-zero on failure. A failure to update
>> + * means that the transaction as a whole has failed and will need to be
>> + * rolled back.
>> + */
>
> Thanks for this documentation.
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