Change the update_ref helper function to use a ref transaction internally.

Reviewed-by: Jonathan Nieder <jrnie...@gmail.com>
Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 refs.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/refs.c b/refs.c
index b75523f..50e5475 100644
--- a/refs.c
+++ b/refs.c
@@ -3521,11 +3521,28 @@ int update_ref(const char *action, const char *refname,
               const unsigned char *sha1, const unsigned char *oldval,
               int flags, enum action_on_err onerr)
 {
-       struct ref_lock *lock;
-       lock = update_ref_lock(refname, oldval, flags, NULL, onerr);
-       if (!lock)
+       struct ref_transaction *t;
+       struct strbuf err = STRBUF_INIT;
+
+       t = ref_transaction_begin(&err);
+       if (!t ||
+           ref_transaction_update(t, refname, sha1, oldval, flags,
+                                  !!oldval, &err) ||
+           ref_transaction_commit(t, action, &err)) {
+               const char *str = "update_ref failed for ref '%s': %s";
+
+               ref_transaction_free(t);
+               switch (onerr) {
+               case UPDATE_REFS_MSG_ON_ERR:
+                       error(str, refname, err.buf); break;
+               case UPDATE_REFS_DIE_ON_ERR:
+                       die(str, refname, err.buf); break;
+               case UPDATE_REFS_QUIET_ON_ERR: break;
+               }
+               strbuf_release(&err);
                return 1;
-       return update_ref_write(action, refname, sha1, lock, NULL, onerr);
+       }
+       return 0;
 }
 
 static int ref_update_compare(const void *r1, const void *r2)
-- 
2.0.0.282.g3799eda.dirty

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