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#! /usr/bin/env python

# linktree

# Make a copy of a directory tree with symbolic links to all files in the

# original tree.

# All symbolic links go to a special symbolic link at the top, so you

# can easily fix things if the original source tree moves.

# See also "mkreal".

# usage: mklinks oldtree newtree

import sys, os

LINK = '.LINK' # Name of special symlink at the top.

debug = 0

def main():

if not 3 <= len(sys.argv) <= 4:

print 'usage:', sys.argv[0], 'oldtree newtree [linkto]'

return 2

oldtree, newtree = sys.argv[1], sys.argv[2]

if len(sys.argv) > 3:

link = sys.argv[3]

link_may_fail = 1

else:

link = LINK

link_may_fail = 0

if not os.path.isdir(oldtree):

print oldtree + ': not a directory'

return 1

try:

os.mkdir(newtree, 0777)

except os.error, msg:

print newtree + ': cannot mkdir:', msg

return 1

linkname = os.path.join(newtree, link)

try:

os.symlink(os.path.join(os.pardir, oldtree), linkname)

except os.error, msg:

if not link_may_fail:

print linkname + ': cannot symlink:', msg

return 1

else:

print linkname + ': warning: cannot symlink:', msg

linknames(oldtree, newtree, link)

return 0

def linknames(old, new, link):

if debug: print 'linknames', (old, new, link)

try:

names = os.listdir(old)

except os.error, msg:

print old + ': warning: cannot listdir:', msg

return

for name in names:

if name not in (os.curdir, os.pardir):

oldname = os.path.join(old, name)

linkname = os.path.join(link, name)

newname = os.path.join(new, name)

if debug > 1: print oldname, newname, linkname

if os.path.isdir(oldname) and \

not os.path.islink(oldname):

try:

os.mkdir(newname, 0777)

ok = 1

except:

print newname + \

': warning: cannot mkdir:', msg

ok = 0

if ok:

linkname = os.path.join(os.pardir,

linkname)

linknames(oldname, newname, linkname)

else:

os.symlink(linkname, newname)

if __name__ == '__main__':

sys.exit(main())