use shallow feature flag in shallow clone support source code

src/commit.c

@@ -500,14 +500,18 @@ int git_commit__parse_raw(void *commit, const char *data, size_t size)
 
 int git_commit__parse_ext(git_commit *commit, git_odb_object *odb_obj, unsigned int flags)
 {
-	git_repository *repo = git_object_owner((git_object *)commit);
-	git_commit_graft *graft;
+
 	int error;
 	
 	if ((error = commit_parse(commit, git_odb_object_data(odb_obj),
 				  git_odb_object_size(odb_obj), flags)) < 0)
 		return error;
 
+	if (GIT_OPT_ENABLE_SHALLOW) {
+
+		git_repository *repo = git_object_owner((git_object *)commit);
+		git_commit_graft *graft;
+
 		/* Perform necessary grafts */
 		if (git_grafts_get(&graft, repo->grafts, git_odb_object_id(odb_obj)) == 0 ||
 			git_grafts_get(&graft, repo->shallow_grafts, git_odb_object_id(odb_obj)) == 0) {
@@ -523,6 +527,8 @@ int git_commit__parse_ext(git_commit *commit, git_odb_object *odb_obj, unsigned
 			}
 		}
 
+	}
+	
 	return 0;
 }
 

src/repository.c

@@ -926,7 +926,7 @@ int git_repository_open_ext(
 	if ((error = check_extensions(config, version)) < 0)
 		goto cleanup;
 
-	if ((error = load_grafts(repo)) < 0)
+	if (GIT_OPT_ENABLE_SHALLOW && (error = load_grafts(repo)) < 0)
 		goto cleanup;
 
 	if ((flags & GIT_REPOSITORY_OPEN_BARE) != 0)