chrome-bot@dgarrett-test-instance:~$ sudo /etc/rc.local
Traceback (most recent call last):
  File "/home/chrome-bot/gcompute-tools/git-cookie-authdaemon", line 116, in <module>
    main()
  File "/home/chrome-bot/gcompute-tools/git-cookie-authdaemon", line 98, in main
    expires = update_cookie(retry=False)
  File "/home/chrome-bot/gcompute-tools/git-cookie-authdaemon", line 53, in update_cookie
    token = acquire_token(retry)
  File "/home/chrome-bot/gcompute-tools/git-cookie-authdaemon", line 45, in acquire_token
    with contextlib.closing(urllib2.urlopen(A + '?scopes=' + S)) as token:
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 400: Bad Request

That is only seen on a test image created recently.

For now, I'm working around this by using .netrc authentication on GCE.

Fixed by switching to ccompute.