python 2.4 remount external usb

remount.py

#!/usr/bin/python

import os
import time

def get_cmd_output(cmd):
  tmp_fn = "/tmp/mnt_check.tmp"
  os.system('%s > %s' % (cmd, tmp_fn))
  fp = open(tmp_fn, 'r')
  out = fp.read()
  fp.close()
  os.remove(tmp_fn)
  return out

mp = get_cmd_output("cat /proc/mounts |grep /root/mnt")
if mp:
  mp = mp.split()[0]  # ex. /dev/sdc1

  if not os.path.exists(mp):
    os.system('umount /root/mnt')
    os.system('mount %s /root/mnt' % mp)
    fp = open('/var/log/remount.log' , 'a')
    fp.write(time.asctime() + ' remount /root/mnt as ' + mp + '\n')
    fp .close()