sequencer.c: use ref transactions for all ref updates

Change to use ref transactions for all updates to refs.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sequencer.c b/sequencer.c
index 0a80c58d1194c3476dfd2861a98fbd08610597a3..5e93b6ab5fdf2f5af4233986137d15351f7a741b 100644 (file)
--- a/sequencer.c
+++ b/sequencer.c
@@ -272,23 +272,33 @@ 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"));
 
        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, unborn ? null_sha1 : from,
+                                  0, 1, &err) ||
+           ref_transaction_commit(transaction, sb.buf, &err)) {
+               ref_transaction_free(transaction);
+               error("%s", err.buf);
+               strbuf_release(&sb);
+               strbuf_release(&err);
+               return -1;
+       }
 
        strbuf_release(&sb);
-       return ret;
+       strbuf_release(&err);
+       ref_transaction_free(transaction);
+       return 0;
 }
 
 static int do_recursive_merge(struct commit *base, struct commit *next,