cpython/Tools/scripts/findlinksto.py

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#! /usr/local/bin/python
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# findlinksto
#
# find symbolic links to a path matching a regular expression
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import os
import sys
import regex
import getopt
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def main():
try:
opts, args = getopt.getopt(sys.argv[1:], '')
if len(args) < 2:
raise getopt.error, 'not enough arguments'
except getopt.error, msg:
sys.stdout = sys.stderr
print msg
print 'usage: findlinksto pattern directory ...'
sys.exit(2)
pat, dirs = args[0], args[1:]
prog = regex.compile(pat)
for dirname in dirs:
os.path.walk(dirname, visit, prog)
def visit(prog, dirname, names):
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if os.path.islink(dirname):
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names[:] = []
return
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if os.path.ismount(dirname):
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print 'descend into', dirname
for name in names:
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name = os.path.join(dirname, name)
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try:
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linkto = os.readlink(name)
if prog.search(linkto) >= 0:
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print name, '->', linkto
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except os.error:
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pass
main()