Function solana_genesis_utils::download_then_check_genesis_hash

pub fn download_then_check_genesis_hash(
    rpc_addr: &SocketAddr, 
    ledger_path: &Path, 
    expected_genesis_hash: Option<Hash>, 
    max_genesis_archive_unpacked_size: u64, 
    no_genesis_fetch: bool, 
    use_progress_bar: bool
) -> Result<GenesisConfig, String>