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#! /usr/bin/env python3
# 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 as 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.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 OSError:
pass
if __name__ == '__main__':
main()
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