#! /usr/bin/env python

# findlinksto

#

# find symbolic links to a path matching a regular expression

import os

import sys

import re

import getopt

def main():

    try:

        opts, args = getopt.getopt(sys.argv[1:], '')

        if len(args) < 2:

            raise getopt.GetoptError('not enough arguments', None)

    except getopt.GetoptError, msg:

        sys.stdout = sys.stderr

        print msg

        print 'usage: findlinksto pattern directory ...'

        sys.exit(2)

    pat, dirs = args[0], args[1:]

    prog = re.compile(pat)

    for dirname in dirs:

        os.path.walk(dirname, visit, prog)

def visit(prog, dirname, names):

    if os.path.islink(dirname):

        names[:] = []

        return

    if os.path.ismount(dirname):

        print 'descend into', dirname

    for name in names:

        name = os.path.join(dirname, name)

        try:

            linkto = os.readlink(name)

            if prog.search(linkto) is not None:

                print name, '->', linkto

        except os.error:

            pass

if __name__ == '__main__':

    main()