title: Running gsutil on MacOS
body: <p>I am trying to use gsutil to set CORS on my firebase storage bucket according to googles instructions using the newest version of MacOS. I am not sure if I havn't installed gsutil correctly or if the is something else I don't understand, but when I run <code>gsutil cors set cors.json gs://docavea2.appspot.com</code> I get the following error:</p>
  
  <pre><code>Setting CORS on gs://docavea2.appspot.com/...
  Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "/Users/jr/google-cloud-sdk/platform/gsutil/gslib/__init__.py", line 119, in &lt;module&gt;
      CHECKSUM_FILE, CHECKSUM = _GetFileContents('CHECKSUM')
    File "/Users/jr/google-cloud-sdk/platform/gsutil/gslib/__init__.py", line 107, in _GetFileContents
      content = pkgutil.get_data('gslib', filename)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 591, in get_data
      return loader.get_data(resource_name)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 255, in get_data
      return open(pathname, "rb").read()
  IOError: [Errno 2] No such file or directory: '/Users/jr/google-cloud-sdk/platform/gsutil/gslib/CHECKSUM'
  </code></pre>
  
  <p>I think my cors.json is fine, because when I use it with gsutil on Windows it works fine and CORS is set correctly, but this is the content:</p>
  
  <pre><code>[
      {
          "origin": ["*"],
          "method": ["GET"],
          "maxAgeSeconds": 3600
      }
  ]
  </code></pre>
  
  <p>I have seen here on stackoverflow that somebody said that it worked for him if he put [{ on the same line, but it makes no difference for me.</p>