[PATCH 2/5] commit_ref_update(): new function, extracted from write_ref_sha1()

[Michael Haggerty <mhagger@alum.mit.edu>]

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/refs.c b/refs.c
index 72dae21..9b68aec 100644
--- a/refs.c
+++ b/refs.c
@@ -3052,16 +3052,9 @@ static int write_ref_to_lockfile(struct ref_lock *lock, const unsigned char *sha
 	return 0;
 }
 
-/*
- * Write sha1 into the ref specified by the lock. Make sure that errno
- * is sane on error.
- */
-static int write_ref_sha1(struct ref_lock *lock,
-	const unsigned char *sha1, const char *logmsg)
+static int commit_ref_update(struct ref_lock *lock,
+			     const unsigned char *sha1, const char *logmsg)
 {
-	if (write_ref_to_lockfile(lock, sha1))
-		return -1;
-
 	clear_loose_ref_cache(&ref_cache);
 	if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
 	    (strcmp(lock->ref_name, lock->orig_ref_name) &&
@@ -3100,6 +3093,21 @@ static int write_ref_sha1(struct ref_lock *lock,
 	return 0;
 }
 
+/*
+ * Write sha1 as the new value of the reference specified by the
+ * (open) lock. On error, roll back the lockfile and set errno
+ * appropriately.
+ */
+static int write_ref_sha1(struct ref_lock *lock,
+	const unsigned char *sha1, const char *logmsg)
+{
+	if (write_ref_to_lockfile(lock, sha1) ||
+	    commit_ref_update(lock, sha1, logmsg))
+		return -1;
+
+	return 0;
+}
+
 int create_symref(const char *ref_target, const char *refs_heads_master,
 		  const char *logmsg)
 {
-- 
2.1.4