/*
     * We should have already set up the checkpoint cursor snapshot to read the history store unless
     * we are reading the history store checkpoint cursor directly. Check whether we are already in
     * a checkpoint cursor transaction.
     */
    if (!F_ISSET(session->txn, WT_TXN_IS_CHECKPOINT) && WT_READING_CHECKPOINT(session)) {
        /* Checkpoint cursor. */
        if (bulk)
            /* Fail now; otherwise we fail further down and then segfault trying to recover. */
            WT_RET_MSG(session, EINVAL, "checkpoints are read-only and cannot be bulk-loaded");