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2651
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1 #! /usr/local/bin/python
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2
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3 # 3) System Test
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4 #
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5 # Given a list of directories, report any bogus symbolic links contained
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6 # anywhere in those subtrees. A bogus symbolic link is one that cannot
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7 # be resolved because it points to a nonexistent or otherwise
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8 # unresolvable file. Do *not* use an external find executable.
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9 # Directories may be very very deep. Print a warning immediately if the
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10 # system you're running on doesn't support symbolic links.
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11
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12 # This implementation:
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13 # - takes one optional argument, using the current directory as default
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14 # - uses chdir to increase performance
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15 # - sorts the names per directory
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16 # - prints output lines of the form "path1 -> path2" as it goes
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17 # - prints error messages about directories it can't list or chdir into
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18
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19 import os
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20 import sys
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21 from stat import *
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22
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23 def main():
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24 try:
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25 # Note: can't test for presence of lstat -- it's always there
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26 dummy = os.readlink
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27 except AttributeError:
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28 print "This system doesn't have symbolic links"
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29 sys.exit(0)
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30 if sys.argv[1:]:
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31 prefix = sys.argv[1]
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32 else:
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33 prefix = ''
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34 if prefix:
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35 os.chdir(prefix)
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36 if prefix[-1:] != '/': prefix = prefix + '/'
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37 reportboguslinks(prefix)
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38 else:
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39 reportboguslinks('')
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40
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41 def reportboguslinks(prefix):
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42 try:
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43 names = os.listdir('.')
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44 except os.error, msg:
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45 print "%s%s: can't list: %s" % (prefix, '.', msg)
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46 return
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47 names.sort()
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48 for name in names:
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49 if name == os.curdir or name == os.pardir:
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50 continue
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51 try:
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52 mode = os.lstat(name)[ST_MODE]
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53 except os.error:
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54 print "%s%s: can't stat: %s" % (prefix, name, msg)
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55 continue
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56 if S_ISLNK(mode):
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57 try:
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58 os.stat(name)
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59 except os.error:
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60 print "%s%s -> %s" % \
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61 (prefix, name, os.readlink(name))
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62 elif S_ISDIR(mode):
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63 try:
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64 os.chdir(name)
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65 except os.error, msg:
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66 print "%s%s: can't chdir: %s" % \
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67 (prefix, name, msg)
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68 continue
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69 try:
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70 reportboguslinks(prefix + name + '/')
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71 finally:
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72 os.chdir('..')
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73
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74 main()
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