1 #! /usr/bin/env python

     2 

     3 # findlinksto

     4 #

     5 # find symbolic links to a path matching a regular expression

     6 

     7 import os

     8 import sys

     9 import re

    10 import getopt

    11 

    12 def main():

    13     try:

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

    15         if len(args) < 2:

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

    17     except getopt.GetoptError, msg:

    18         sys.stdout = sys.stderr

    19         print msg

    20         print 'usage: findlinksto pattern directory ...'

    21         sys.exit(2)

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

    23     prog = re.compile(pat)

    24     for dirname in dirs:

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

    26 

    27 def visit(prog, dirname, names):

    28     if os.path.islink(dirname):

    29         names[:] = []

    30         return

    31     if os.path.ismount(dirname):

    32         print 'descend into', dirname

    33     for name in names:

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

    35         try:

    36             linkto = os.readlink(name)

    37             if prog.search(linkto) is not None:

    38                 print name, '->', linkto

    39         except os.error:

    40             pass

    41 

    42 if __name__ == '__main__':

    43     main()