commit: allow lookup_commit to handle arbitrary repositories

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.c

@@ -53,13 +53,13 @@ struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref
 	return c;
 }
 
-struct commit *lookup_commit_the_repository(const struct object_id *oid)
+struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
 {
-	struct object *obj = lookup_object(the_repository, oid->hash);
+	struct object *obj = lookup_object(r, oid->hash);
 	if (!obj)
-		return create_object(the_repository, oid->hash,
-				     alloc_commit_node(the_repository));
-	return object_as_type(the_repository, obj, OBJ_COMMIT, 0);
+		return create_object(r, oid->hash,
+				     alloc_commit_node(r));
+	return object_as_type(r, obj, OBJ_COMMIT, 0);
 }
 
 struct commit *lookup_commit_reference_by_name(const char *name)

commit.h

@@ -63,8 +63,7 @@ enum decoration_type {
 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
 const struct name_decoration *get_name_decoration(const struct object *obj);
 
-#define lookup_commit(r, o) lookup_commit_##r(o)
-struct commit *lookup_commit_the_repository(const struct object_id *oid);
+struct commit *lookup_commit(struct repository *r, const struct object_id *oid);
 #define lookup_commit_reference(r, o) \
 		lookup_commit_reference_##r(o)
 struct commit *lookup_commit_reference_the_repository(const struct object_id *oid);