Separate xvfb.py logic into its own script

tools/isolate/tree_creator.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Creates a tree of hardlinks, symlinks or copy the inputs files."""
 
 import ctypes
 import logging
 import os
 import shutil
@@ skipping 40 matching lines @@
     infile = os.path.normpath(os.path.join(indir, relfile))
     if not infile.startswith(indir):
       raise MappingError('Can\'t map file %s outside %s' % (infile, indir))
 
     if relfile.endswith('/'):
       if not os.path.isdir(infile):
         raise MappingError(
             'Input directory %s must have a trailing slash' % infile)
       for dirpath, dirnames, filenames in os.walk(infile):
         # Convert the absolute path to subdir + relative subdirectory.
-        relpath = dirpath[len(infile)+1:]
+        relpath = dirpath[len(indir)+1:]
         outfiles.extend(os.path.join(relpath, f) for f in filenames)
         for index, dirname in enumerate(dirnames):
           # Do not process blacklisted directories.
           if blacklist(os.path.join(relpath, dirname)):
             del dirnames[index]
     else:
       if not os.path.isfile(infile):
         raise MappingError('Input file %s doesn\'t exist' % infile)
       outfiles.append(relfile)
   return outfiles, indir
@@ skipping 69 matching lines @@
 
 def make_writable(root, read_only):
   """Toggle the writable bit on a directory tree."""
   root = os.path.abspath(root)
   for dirpath, dirnames, filenames in os.walk(root, topdown=True):
     for filename in filenames:
       _set_write_bit(os.path.join(dirpath, filename), read_only)
 
     for dirname in dirnames:
       _set_write_bit(os.path.join(dirpath, dirname), read_only)