// Copyright 2021-2022, Offchain Labs, Inc.
// For license information, see https://github.com/OffchainLabs/nitro-contracts/blob/main/LICENSE
// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.0;

import "../precompiles/ArbSys.sol";

library ArbitrumChecker {
    function runningOnArbitrum() internal view returns (bool) {
        (bool ok, bytes memory data) =
            address(100).staticcall(abi.encodeWithSelector(ArbSys.arbOSVersion.selector));
        return ok && data.length == 32;
    }
}