Update replace.c to use ref transactions for updates.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 builtin/replace.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/builtin/replace.c b/builtin/replace.c
index b62420a..b91e550 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -129,7 +129,7 @@ static int replace_object(const char *object_ref, const 
char *replace_ref,
        unsigned char object[20], prev[20], repl[20];
        enum object_type obj_type, repl_type;
        char ref[PATH_MAX];
-       struct ref_lock *lock;
+       struct ref_transaction *transaction;
 
        if (get_sha1(object_ref, object))
                die("Failed to resolve '%s' as a valid ref.", object_ref);
@@ -157,11 +157,12 @@ static int replace_object(const char *object_ref, const 
char *replace_ref,
        else if (!force)
                die("replace ref '%s' already exists", ref);
 
-       lock = lock_any_ref_for_update(ref, prev, 0, NULL);
-       if (!lock)
-               die("%s: cannot lock the ref", ref);
-       if (write_ref_sha1(lock, repl, NULL) < 0)
-               die("%s: cannot update the ref", ref);
+       transaction = ref_transaction_begin();
+       if (!transaction ||
+           ref_transaction_update(transaction, ref, repl, prev,
+                                  0, !is_null_sha1(prev)) ||
+           ref_transaction_commit(transaction, NULL, UPDATE_REFS_DIE_ON_ERR))
+               die(_("%s: failed to replace ref"), ref);
 
        return 0;
 }
-- 
1.9.1.515.g3b87021

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