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1 #! /usr/local/python
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2
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3 # linktree
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4 #
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5 # Make a copy of a directory tree with symbolic links to all files in the
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6 # original tree.
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7 # All symbolic links go to a special symbolic link at the top, so you
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8 # can easily fix things if the original source tree moves.
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9 # See also "mkreal".
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10 #
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11 # usage: mklinks oldtree newtree
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12
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13 import sys, os
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14
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15 LINK = '.LINK' # Name of special symlink at the top.
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16
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17 debug = 0
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18
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19 def main():
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20 if not 3 <= len(sys.argv) <= 4:
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21 print 'usage:', sys.argv[0], 'oldtree newtree [linkto]'
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22 return 2
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23 oldtree, newtree = sys.argv[1], sys.argv[2]
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24 if len(sys.argv) > 3:
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25 link = sys.argv[3]
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26 link_may_fail = 1
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27 else:
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28 link = LINK
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29 link_may_fail = 0
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30 if not os.path.isdir(oldtree):
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31 print oldtree + ': not a directory'
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32 return 1
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33 try:
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34 os.mkdir(newtree, 0777)
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35 except os.error, msg:
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36 print newtree + ': cannot mkdir:', msg
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37 return 1
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38 linkname = os.path.join(newtree, link)
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39 try:
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40 os.symlink(os.path.join(os.pardir, oldtree), linkname)
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41 except os.error, msg:
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42 if not link_may_fail:
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43 print linkname + ': cannot symlink:', msg
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44 return 1
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45 else:
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46 print linkname + ': warning: cannot symlink:', msg
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47 linknames(oldtree, newtree, link)
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48 return 0
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49
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50 def linknames(old, new, link):
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51 if debug: print 'linknames', (old, new, link)
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52 try:
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53 names = os.listdir(old)
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54 except os.error, msg:
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55 print old + ': warning: cannot listdir:', msg
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56 return
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57 for name in names:
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58 if name not in (os.curdir, os.pardir):
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59 oldname = os.path.join(old, name)
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60 linkname = os.path.join(link, name)
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61 newname = os.path.join(new, name)
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62 if debug > 1: print oldname, newname, linkname
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63 if os.path.isdir(oldname) and not os.path.islink(oldname):
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64 try:
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65 os.mkdir(newname, 0777)
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66 ok = 1
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67 except:
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68 print newname + ': warning: cannot mkdir:', msg
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69 ok = 0
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70 if ok:
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71 linkname = os.path.join(os.pardir, linkname)
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72 linknames(oldname, newname, linkname)
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73 else:
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74 os.symlink(linkname, newname)
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75
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76 sys.exit(main())
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