findlinksto.py revision 70c4378dbcfdcbeef6fb3aa348f32ed862fe8eb7 
1#! /usr/bin/env python
2
3# findlinksto
4#
5# find symbolic links to a path matching a regular expression
6
7import os
8import sys
9import regex
10import getopt
11
12def main():
13    try:
14        opts, args = getopt.getopt(sys.argv[1:], '')
15        if len(args) < 2:
16            raise getopt.error, 'not enough arguments'
17    except getopt.error, 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 = regex.compile(pat)
24    for dirname in dirs:
25        os.path.walk(dirname, visit, prog)
26
27def 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) >= 0:
38                print name, '->', linkto
39        except os.error:
40            pass
41
42main()
43