refs: add methods for reflog
In the file-based backend, the reflog piggybacks on the ref lock. Since other backends won't have the same sort of ref lock, ref backends must also handle reflogs. Signed-off-by: NRonnie Sahlberg <rsahlberg@google.com> Signed-off-by: NDavid Turner <dturner@twopensource.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com> Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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