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      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()
     44