Watch a directory for filesystem events, and rsync individually changed files to a remote path

rsyncwatch.py

#!/usr/bin/env python
# requires the "MacFSEvents" package
import fsevents
import time
import sys
import os
import subprocess

observer = fsevents.Observer()

if len(sys.argv) < 4 or (not os.path.exists(sys.argv[1])):
    print("Usage: {0} <srcpath> <desthost> <destpath> [rsyncargs]".format(sys.argv[0]))
    sys.exit(1)
else:
    srcpath = os.path.abspath(sys.argv[1])
    desthost = sys.argv[2]
    destpath = sys.argv[3]
    rsyncargs = sys.argv[4:]

def callback(event):
    if event.mask & (fsevents.IN_ATTRIB | fsevents.IN_CREATE
        | fsevents.IN_MODIFY | fsevents.IN_MOVED_TO):
        relpath = os.path.relpath(event.name, srcpath)
        if os.path.isdir(event.name):
            #For directories, use the parent as the dest path
            fulldestpath, _ = os.path.split(os.path.join(destpath,relpath))
        else:
            fulldestpath = os.path.join(destpath,relpath)
        args = ["/usr/bin/rsync"]
        args.extend(rsyncargs)
        args.append(event.name)
        args.append("{0}:{1}".format(desthost, fulldestpath))
        print(" ".join(args))
        subprocess.call(args)

stream = fsevents.Stream(callback, srcpath, file_events=True)
observer.schedule(stream)
try:
    observer.start()
    while True: time.sleep(86400)
except KeyboardInterrupt:
    observer.unschedule(stream)
    observer.stop()