Comment 2 for bug 1068519

Ditto with a subordinate:

2013-02-13 11:08:56,864 unit:openstack-dashboard-hacluster/1: twisted ERROR: Unhandled error in Deferred:
2013-02-13 11:08:56,870 unit:openstack-dashboard-hacluster/1: twisted ERROR: Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 422, in errback
    self._startRunCallbacks(fail)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 489, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 576, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1127, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1069, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/lib/juju/juju/juju/agents/base.py", line 247, in startService
    yield self.start()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1071, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/juju/juju/juju/agents/unit.py", line 86, in start
    self.api_socket = reactor.listenUNIX(socket_path, self.api_factory)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/posixbase.py", line 413, in listenUNIX
    p.startListening()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/unix.py", line 293, in startListening
    raise CannotListenError, (None, self.port, le)
twisted.internet.error.CannotListenError: Couldn't listen on any:/var/lib/juju/units/openstack-dashboard-hacluster-1/units/openstack-dashboard-hacluster-1/.juju.hookcli.sock: AF_UNIX path too long.