http://snipt.org/ypkg9

mirrior.py

#!/usr/bin/python
from os import listdir, symlink, makedirs
from os.path import basename, join, isdir, isfile, islink, getsize, exists

def all_entry(entry):
    return True

def to_bytes(size):
    if size.endswith("K"):
        return int(size[:-1]) * 1024
    elif size.endwith("M"):
        return int(size[:-1]) * 1024 * 1024
    elif size.endwith("G"):
        return int(size[:-1]) * 1024 * 1024 * 1024
    else:
        return int(size)

def bigger_than(size):
    def inner(entry):
        return getsize(entry) > to_bytes(size)
    return inner

def vc_dir(entry):
    return entry == ".git" or entry == ".svn"

def is_hidden(entry):
    return basename(entry).startswith(".")

def has_exts(*exts):
    def inner(entry):
        return any(map(lambda ext:entry.endswith(ext), exts))
    return inner

def a(*rules):
    def inner(entry):
        return all(map(lambda rule: rule(entry), rules))
    return inner

def o(*rules):
    def inner(entry):
        return any(map(lambda rule: rule(entry), rules))
    return inner

def n(rule):
    def inner(entry):
        return not(rule(entry))
    return inner

def mirror(src, dest, dir_rule, file_rule):
    def inner(src, dest):
        for entry in listdir(src):
            try:
                cur_src = join(src, entry)
                cur_dest = join(dest, entry)
                if islink(cur_src):
                    continue
                if isdir(cur_src) and dir_rule(cur_src) and not exists(cur_dest):
                    makedirs(cur_dest)
                    inner(cur_src, cur_dest)
                    continue
                if isfile(cur_src) and file_rule(cur_src) and not exists(cur_dest) :
                    symlink(cur_src, cur_dest)
                    continue
            except Exception as e:
                print e
    inner(src, dest)


# must edit by mannual
dropbox_dir="/home/yourname/Dropbox"
rules = [
    ("/home/yourname/workspace1", all_entry, all_entry),
    ("/home/yourname/workspace2", n(is_hidden), all_entry),
    ("/home/yourname/workspace3", n(vc_dir), has_exts(".txt", ".py")),
    ("/home/yourname/workspace4", n(vc_dir), a(has_exts(".log"), n(bigger_than("500M"))))
]

if __name__ == '__main__':
    for src, dir_rule, file_rule in rules:
        mirror(src, join(dropbox_dir, basename(src)), dir_rule, file_rule)