How to use the chore.check_pre function in chore

return (opts, args)

def parse_root(path):
    return path.replace("%PID", str(os.getpid()))

if __name__ == "__main__":
    (opts, args) = parse_args()

    if opts.list_syscalls:
        print_syscalls(opts)
        exit(1)

    # check pre condition when unit testing
    if opts.test:
        dbg.info("[!] checking %s" % args[0])
        if not chore.check_pre(args[0]):
            exit(1)

    # interpose opt
    if opts.interpose == "seccomp":
        interpose = tracer.TRACE_SECCOMP
    elif opts.interpose == "ptrace":
        interpose = tracer.TRACE_PTRACE
    else:
        dbg.error("Failed to find %s module" % opts.interpose)
        exit(1)

    # change directory
    if opts.cd:
        os.chdir(opts.cd)

    # sandbox container