old_contents: #!/usr/bin/python
  # Copyright 2013 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.
  
  # This script can either source a file and dump the enironment changes done by
  # it, or just simply dump the current environment as JSON into a file.
  
  import json
  import optparse
  import os
  import subprocess
  import sys
  
  
  def main():
    parser = optparse.OptionParser()
    parser.add_option('-f', '--output-json',
                      help='File to dump the environment as JSON into.')
    parser.add_option(
        '-d', '--dump-mode', action='store_true',
        help='Dump the environment to the file and exit immediately.')
  
    options, args = parser.parse_args()
    if not options.output_json:
      parser.error('Requires --output-json option.')
  
    if options.dump_mode:
      if args:
        parser.error("Cannot specify args with --dump-mode")
      with open(options.output_json, 'w') as f:
        json.dump(dict(os.environ), f)
    else:
      envsetup_cmd = ' '.join(args)
      full_cmd = [
          'bash', '-c',
          '. %s; ./%s -d -f %s' % (envsetup_cmd, __file__, options.output_json)]
      ret = subprocess.call(full_cmd)
      if ret:
        sys.exit('Error running %s and dumping env', envsetup_cmd)
  
  
  if __name__ == '__main__':
    sys.exit(main())
  
new_contents: #!/usr/bin/python
  # Copyright 2013 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.
  
  # This script can either source a file and dump the enironment changes done by
  # it, or just simply dump the current environment as JSON into a file.
  
  import json
  import optparse
  import os
  import pipes
  import subprocess
  import sys
  
  
  def main():
    parser = optparse.OptionParser()
    parser.add_option('-f', '--output-json',
                      help='File to dump the environment as JSON into.')
    parser.add_option(
        '-d', '--dump-mode', action='store_true',
        help='Dump the environment to the file and exit immediately.')
  
    options, args = parser.parse_args()
    if not options.output_json:
      parser.error('Requires --output-json option.')
  
    if options.dump_mode:
      if args:
        parser.error("Cannot specify args with --dump-mode")
      with open(options.output_json, 'w') as f:
        json.dump(dict(os.environ), f)
    else:
      envsetup_cmd = ' '.join(map(pipes.quote, args))
      full_cmd = [
          'bash', '-c',
          '. %s; %s -d -f %s' % (envsetup_cmd, os.path.abspath(__file__),
                                 options.output_json)
      ]
      ret = subprocess.call(full_cmd)
      if ret:
        sys.exit('Error running %s and dumping env' % envsetup_cmd)
  
  
  if __name__ == '__main__':
    sys.exit(main())
  
subject: Fix few errors in env_dump.py.