[PATCH v3 2/4] commit: add gentle reference lookup method

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <derrickstolee@github.com>

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>
---
 commit.c | 8 +++++++-
 commit.h | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/commit.c b/commit.c
index 1a479a997c4..ed49be8dce5 100644
--- a/commit.c
+++ b/commit.c
@@ -82,13 +82,19 @@ 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;
diff --git a/commit.h b/commit.h
index 62fe0d77a70..ef17668cc69 100644
--- a/commit.h
+++ b/commit.h
@@ -81,6 +81,8 @@ struct commit *lookup_commit_reference_gently(struct repository *r,
 					      const struct object_id *oid,
 					      int quiet);
 struct commit *lookup_commit_reference_by_name(const char *name);
+struct commit *lookup_commit_reference_by_name_gently(const char *name,
+						      int quiet);
 
 /*
  * Look up object named by "oid", dereference tag as necessary,
-- 
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