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#!/usr/bin/env python3
import argparse
import os
import sys
def main():
ap = argparse.ArgumentParser()
ap.add_argument("-a", default="qmail-authuser", dest="pam")
ap.add_argument("fd", type=int)
ap.add_argument("prog")
ap.add_argument("args", nargs='*')
vals = ap.parse_args()
if vals.fd < 3:
raise ValueError(f"fd({fd}) must be 3 or greater")
if vals.fd != 3:
os.dup2(vals.fd, 3)
os.close(vals.fd)
os.execvp(vals.pam, [vals.pam, vals.prog] + vals.args)
raise ValueError("should not be reachable")
if __name__ == '__main__':
main()
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