Change to use ref transactions for all updates to refs.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 sequencer.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 0a80c58..9282a12 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -272,23 +272,31 @@ 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();
+       if ((!transaction ||
+           ref_transaction_update(transaction, "HEAD", to, from,
+                                  0, !unborn)) ||
+           (ref_transaction_commit(transaction, sb.buf, &err) &&
+            !(transaction = NULL))) {
+               ref_transaction_rollback(transaction);
+               error(_("HEAD: Could not fast-forward: %s\n"), err.buf);
+               strbuf_release(&sb);
+               strbuf_release(&err);
+               return -1;
+       }
 
        strbuf_release(&sb);
-       return ret;
+       return 0;
 }
 
 static int do_recursive_merge(struct commit *base, struct commit *next,
-- 
2.0.0.rc3.471.g2055d11.dirty

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