sync files in an "autosync" directory on seedbox to local linux NAS (my book live etc)

autosync.py

# sync files in an "autosync" directory on seedbox to local linux NAS (my book live etc)
# add this script to crontab 
# this script will check whether local machine is online.

import subprocess, os, sys
import cPickle as pickle 

def connchk(host,port):
    import socket
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.settimeout(8)
    try:
        s.connect((host, int(port)))
        s.shutdown(2)
        return 200
    except Exception, e:
        try:
            errno, errtxt = e
        except ValueError:
            return 404
    s.close

autosyncdir=$autosyncdir #for example: '/home/xx/tdowndir/autosync/'
cf = $autosynclistcachefile #for example: '/home/xx/autosynclstc.txt'
synclst = $autosynclist  #for example: '/home/xx/autosynclst.txt'
localip = $localip #for example: '123.57.59.222'
localsshpath = $localsshpath  #for example: 'root@123.57.59.222:/shares/Dump/'

if os.stat(cf)[6]==0:
	cached=[]
else:
    with open(cf,"rb") as handle:
    	cached = pickle.loads(handle.read())

newcache = []

for item in os.listdir(autosyncdir):
	if item not in cached:
		newcache.append(item)
			
if newcache!=[]:
	if connchk(localip, "22")==200:
		with open(cf,"w+b") as handle:
			cached = cached + newcache
			pickle.dump(cached,handle)
	
		slst = open(synclst, 'w')
		for item in newcache:
			print >> slst, item
		slst.close()	 
		proc = subprocess.Popen(['screen', '-d', '-m', 'rsync', '-avrz', '--progress', '--bwlimit=560', '--files-from='+ cf , autosyncdir, localsshpath])
	else:
		sys.exit()