You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.2 KiB
75 lines
2.2 KiB
4 months ago
|
#! /usr/bin/env python
|
||
|
|
|
||
|
|
# 3) System Test
|
||
|
|
#
|
||
|
|
# Given a list of directories, report any bogus symbolic links contained
|
||
|
|
# anywhere in those subtrees. A bogus symbolic link is one that cannot
|
||
|
|
# be resolved because it points to a nonexistent or otherwise
|
||
|
|
# unresolvable file. Do *not* use an external find executable.
|
||
|
|
# Directories may be very very deep. Print a warning immediately if the
|
||
|
|
# system you're running on doesn't support symbolic links.
|
||
|
|
|
||
|
|
# This implementation:
|
||
|
|
# - takes one optional argument, using the current directory as default
|
||
|
|
# - uses chdir to increase performance
|
||
|
|
# - sorts the names per directory
|
||
|
|
# - prints output lines of the form "path1 -> path2" as it goes
|
||
|
|
# - prints error messages about directories it can't list or chdir into
|
||
|
|
|
||
|
|
import os
|
||
|
|
import sys
|
||
|
|
from stat import *
|
||
|
|
|
||
|
|
def main():
|
||
|
|
try:
|
||
|
|
# Note: can't test for presence of lstat -- it's always there
|
||
|
|
dummy = os.readlink
|
||
|
|
except AttributeError:
|
||
|
|
print "This system doesn't have symbolic links"
|
||
|
|
sys.exit(0)
|
||
|
|
if sys.argv[1:]:
|
||
|
|
prefix = sys.argv[1]
|
||
|
|
else:
|
||
|
|
prefix = ''
|
||
|
|
if prefix:
|
||
|
|
os.chdir(prefix)
|
||
|
|
if prefix[-1:] != '/': prefix = prefix + '/'
|
||
|
|
reportboguslinks(prefix)
|
||
|
|
else:
|
||
|
|
reportboguslinks('')
|
||
|
|
|
||
|
|
def reportboguslinks(prefix):
|
||
|
|
try:
|
||
|
|
names = os.listdir('.')
|
||
|
|
except os.error, msg:
|
||
|
|
print "%s%s: can't list: %s" % (prefix, '.', msg)
|
||
|
|
return
|
||
|
|
names.sort()
|
||
|
|
for name in names:
|
||
|
|
if name == os.curdir or name == os.pardir:
|
||
|
|
continue
|
||
|
|
try:
|
||
|
|
mode = os.lstat(name)[ST_MODE]
|
||
|
|
except os.error:
|
||
|
|
print "%s%s: can't stat: %s" % (prefix, name, msg)
|
||
|
|
continue
|
||
|
|
if S_ISLNK(mode):
|
||
|
|
try:
|
||
|
|
os.stat(name)
|
||
|
|
except os.error:
|
||
|
|
print "%s%s -> %s" % \
|
||
|
|
(prefix, name, os.readlink(name))
|
||
|
|
elif S_ISDIR(mode):
|
||
|
|
try:
|
||
|
|
os.chdir(name)
|
||
|
|
except os.error, msg:
|
||
|
|
print "%s%s: can't chdir: %s" % \
|
||
|
|
(prefix, name, msg)
|
||
|
|
continue
|
||
|
|
try:
|
||
|
|
reportboguslinks(prefix + name + '/')
|
||
|
|
finally:
|
||
|
|
os.chdir('..')
|
||
|
|
|
||
|
|
main()
|