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#! /usr/bin/env python3
# 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 as 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 as msg:
print("%s%s: can't chdir: %s" % \
(prefix, name, msg))
continue
try:
reportboguslinks(prefix + name + '/')
finally:
os.chdir('..')
main()
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