ret = notmuch_database_compact (path, backup_path, status_update_cb, NULL);
if (ret) {
fprintf (stderr, "Compaction failed: %s\n", notmuch_status_to_string(ret));
ret = notmuch_database_compact (path, backup_path, status_update_cb, NULL);
if (ret) {
fprintf (stderr, "Compaction failed: %s\n", notmuch_status_to_string(ret));