odb/source: make `close()` function pluggable

Introduce a new callback function in `struct odb_source` to make the
function pluggable.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/odb.c b/odb.c
index 2cf6a53dc3..f7487eb0df 100644
--- a/odb.c
+++ b/odb.c
@@ -1062,10 +1062,8 @@ struct object_database *odb_new(struct repository *repo,
 void odb_close(struct object_database *o)
 {
 	struct odb_source *source;
-	for (source = o->sources; source; source = source->next) {
-		struct odb_source_files *files = odb_source_files_downcast(source);
-		packfile_store_close(files->packed);
-	}
+	for (source = o->sources; source; source = source->next)
+		odb_source_close(source);
 	close_commit_graph(o);
 }