#! /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()

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