commit: add gentle reference lookup method

The lookup_commit_reference_by_name() method uses lookup_commit_reference()
without an option to use lookup_commit_reference_gently(). Create a gentle
version of the method so it can be used in locations where non-commits may
be found but error messages should be silenced.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/commit.c b/commit.c
index 087cb19f4f..e0691c9e52 100644
--- a/commit.c
+++ b/commit.c
@@ -85,12 +85,18 @@ struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
 
 struct commit *lookup_commit_reference_by_name(const char *name)
 {
+	return lookup_commit_reference_by_name_gently(name, 0);
+}
+
+struct commit *lookup_commit_reference_by_name_gently(const char *name,
+						      int quiet)
+{
 	struct object_id oid;
 	struct commit *commit;
 
 	if (repo_get_oid_committish(the_repository, name, &oid))
 		return NULL;
-	commit = lookup_commit_reference(the_repository, &oid);
+	commit = lookup_commit_reference_gently(the_repository, &oid, quiet);
 	if (repo_parse_commit(the_repository, commit))
 		return NULL;
 	return commit;