refs.c: add a strbuf argument to ref_transaction_commit for error logging
Add a strbuf argument to _commit so that we can pass an error string back to the caller. So that we can do error logging from the caller instead of from _commit. Longer term plan is to first convert all callers to use onerr==QUIET_ON_ERR and craft any log messages from the callers themselves and finally remove the onerr argument completely. Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NRonnie Sahlberg <sahlberg@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com> Acked-by: NMichael Haggerty <mhagger@alum.mit.edu>
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