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Introduce a new function `ref_transaction_update_reflog`, for clients to add a reflog update to a transaction. While the existing function `ref_transaction_update` also allows clients to add a reflog entry, this function does a few things more, It: - Enforces that only a reflog entry is added and does not update the ref itself. - Allows the users to also provide the committer information. This means clients can add reflog entries with custom committer information. The `transaction_refname_valid()` function also modifies the error message selectively based on the type of the update. This change also affects reflog updates which go through `ref_transaction_update()`. A follow up commit will utilize this function to add reflog support to `git refs migrate`. Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>