reset: make reset rely on git_repository_head()

src/reset.c

@@ -29,6 +29,7 @@ int git_reset(
 	git_tree *tree = NULL;
 	int error = -1;
 	git_checkout_opts opts;
+	git_reference *head = NULL;
 
 	assert(repo && target);
 	assert(reset_type == GIT_RESET_SOFT
@@ -49,7 +50,10 @@ int git_reset(
 
 	//TODO: Check for unmerged entries
 
-	if (git_reference__update(repo, git_object_id(commit), GIT_HEAD_FILE) < 0)
+	if (git_repository_head(&head, repo) < 0)
+		goto cleanup;
+
+	if (git_reference_set_oid(head, git_object_id(commit)) < 0)
 		goto cleanup;
 
 	if (reset_type == GIT_RESET_SOFT) {
@@ -96,6 +100,7 @@ int git_reset(
 	error = 0;
 
 cleanup:
+	git_reference_free(head);
 	git_object_free(commit);
 	git_index_free(index);
 	git_tree_free(tree);