PowerPath Udev Environment setter

powermt_udev.py

#!/usr/bin/python
# 
# script to be used in udev IMPORT{program} directive
# for naming emcpower devices
#
# Sample output is the following
#  #/usr/local/bin/powermt_udev.py /dev/emcpowera
#  POWERPATH_WWID=0000FFFF12345678BBBB0000
#  POWERPATH_VNXNAME=MY_SPOOL_SPACE
# 
# You need at least two udev rules: the first one sets the udev environment
#  which cannot be set inline
# KERNEL=="emcpower*", IMPORT{program}="/usr/local/bin/powermt_udev.py %k"
# 
# Then the following rules to rename the device
# KERNEL=="emcpower*", ENV{POWERPATH_VNXNAME}=="MY_SPOOL_SPACE", NAME="spool", OWNER="root", GROUP="root", MODE="0600"

import os
from sys import argv
from re import split

device = os.path.basename(argv[1])
for l in os.popen("/sbin/powermt display dev=%s"%device).readlines():
    if not 'Logical' in l:
        continue
    _, _, _, wwid, _, vnxname = split(r'[= \[\]]', l)[:6]
    print("POWERPATH_WWID=%s\nPOWERPATH_VNXNAME=%s" % (wwid, vnxname))
    exit(0)
exit(1)