Cannot use picamera from within docker

[gdunstone]

with
docker create --name eyepi -e PICAM_FILENAMEPREFIX=test -e PICAM_INTERVAL=30s --privileged -v $PWD/data:/var/lib/eyepi:rw -v $PWD/config:/etc/eyepi/:rw stormv/py-eyepi

trying to use picamera at all results in:

mmal: mmal_component_create_core: could not find component 'vc.camera_info'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.6/site-packages/picamera/camera.py", line 367, in __init__
    with mo.MMALCameraInfo() as camera_info:
  File "/usr/lib/python3.6/site-packages/picamera/mmalobj.py", line 2346, in __init__
    super(MMALCameraInfo, self).__init__()
  File "/usr/lib/python3.6/site-packages/picamera/mmalobj.py", line 633, in __init__
    prefix="Failed to create MMAL component %s" % self.component_type)
  File "/usr/lib/python3.6/site-packages/picamera/exc.py", line 184, in mmal_check
    raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to create MMAL component b'vc.camera_info': Function not implemented