findlinksto.py

#! /usr/bin/env python

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

importos
importsys
importre
importgetopt

defmain():
try:
opts, args=getopt.getopt(sys.argv[1:], '')
iflen(args) <2:
raisegetopt.GetoptError('not enough arguments', None)
exceptgetopt.GetoptError, msg:
sys.stdout=sys.stderr
printmsg
print'usage: findlinksto pattern directory ...'
sys.exit(2)
pat, dirs=args[0], args[1:]
prog=re.compile(pat)
fordirnameindirs:
os.path.walk(dirname, visit, prog)

defvisit(prog, dirname, names):
ifos.path.islink(dirname):
names[:] = []
return
ifos.path.ismount(dirname):
print'descend into', dirname
fornameinnames:
name=os.path.join(dirname, name)
try:
linkto=os.readlink(name)
ifprog.search(linkto) isnotNone:
printname, '->', linkto
exceptos.error:
pass

if__name__=='__main__':
main()