#!/usr/bin/env python
import sys, os, subprocess, socket, logging, logging.handlers, time

# script variables
checkPath = "/proc"

# some filesystems are only writable by root
if os.geteuid() != 0:
	subprocess.call(['sudo', 'python', sys.argv[0]]);
	sys.exit(0);

# log to syslog
log = logging.getLogger(__file__)
log.setLevel(logging.DEBUG)

handler = logging.handlers.SysLogHandler(address = '/dev/log');
formatter = logging.Formatter('%(name)s %(levelname)s: %(message)s');
handler.setFormatter(formatter);
log.addHandler(handler);

# print message and exit
def printExit(msg):
    print (msg);
    log.info(msg);
    exit(0);

# program begins
if os.path.isfile('/dev/shm/fsro-py.lock'):
	if time.time() - os.path.getmtime('/dev/shm/fsro-py.lock') > 3600:
		os.remove('/dev/shm/fsro-py.lock');
	printExit('OK Please health check ' + checkPath + ' and delete /dev/shm/fsro-py.lock')
else:
	open('/dev/shm/fsro-py.lock', 'a').close();

mountExists = subprocess.call(["grep", "-q", checkPath, "/proc/mounts"]);
if mountExists != 0:
	printExit('MAJOR Mount ' + checkPath + ' missing');

testFile = checkPath + "/." + socket.gethostname() + "-test.dat";

try:
	with open(testFile, 'wb') as fw:
 		fw.write(os.urandom(10*1024*1024));
		fw.close();
except Exception as e:
        printExit('MAJOR Mount ' + checkPath + ' not writable: ' + repr(e));

try:
	with open(testFile, 'r') as fr:
		fr.read();
		fr.close();
except Exception as e:
        printExit('MAJOR Mount ' + checkPath + ' not readable: ' + repr(e));

os.remove(testFile);
os.remove('/dev/shm/fsro-py.lock');

printExit('OK Mount ' + checkPath + ' healthy');