We shouldn't be using `os.system` here at all. How about switching to `subprocess.call` instead? e.g.:
`subprocess.call(['chmod', 'o+rx', os.path.join(new_dir, 'gsutil')])`
This should handle the whitespace properly automatically.

An even better option would probably be to use `os.walk` and `os.fchmod` instead of piping find output like this.