#! /usr/bin/python

def fail(x):
    print "failure:",x
    exit(2)

try:
    import psutil
except ImportError:
    fail("You need the psutil python module")
    
import optparse

AVAIL = '/proc/sys/kernel/random/entropy_avail'

parser = optparse.OptionParser()
parser.add_option("-w", "--warn", dest="warn_percentage",
  type="int", default=75,
  help="Warning thresold used memory percentage")
parser.add_option("-c", "--crit", dest="crit_percentage",
  type="int", default=85,
  help="Critical thresold used memory percentage")
(options, args) = parser.parse_args()

if len(args) != 0:
    fail( parser.print_help() )


p= psutil.virtual_memory().percent 

status_dict= {0:"OK",1:"WARNING",2:"CRITICAL",3:"UNKNOWN"}

if p > options.crit_percentage:
    status=2
elif p > options.warn_percentage:
    status=1
else:
    status=0

print "{0}: {1:.0f}% used".format(status_dict[status], p)
exit(status)