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[Nikola Đipanov <ndipanov@xxxxxxxxxx>]

** No longer affects: horizon

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https://bugs.launchpad.net/bugs/1337821

Title:
  VMDK Volume attach fails while attaching to an instance that is booted
  from VMDK volume

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  I have booted an instance from a volume, successfully booted,
  now another volume, i try to attach to same instance, it is failing.
  see the stack trace..

  2014-07-04 08:56:11.391 TRACE oslo.messaging.rpc.dispatcher     raise exception.InvalidDevicePath(path=root_device_name)
  2014-07-04 08:56:11.391 TRACE oslo.messaging.rpc.dispatcher InvalidDevicePath: The supplied device path (vda) is invalid.
  2014-07-04 08:56:11.391 TRACE oslo.messaging.rpc.dispatcher
  2014-07-04 08:56:11.396 ERROR oslo.messaging._drivers.common [req-648122d5-fd39-495b-a3a7-a96bd32091d6 admin admin] Returning exception The supplied device path (vda) is invalid. to caller
  2014-07-04 08:56:11.396 ERROR oslo.messaging._drivers.common [req-648122d5-fd39-495b-a3a7-a96bd32091d6 admin admin] ['Traceback (most recent call last):\n', '  File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply\n    incoming.message))\n', '  File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch\n    return self._do_dispatch(endpoint, method, ctxt, args)\n', '  File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch\n    result = getattr(endpoint, method)(ctxt, **new_args)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 401, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/opt/stack/nova/nova/exception.py", line 88, in wrapped\n    payload)\n', '  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__\n    six.reraise(self.type_, self.value, self.tb)\n', '  File "/opt/stack/nova/nova/exception.py", line 71, in wrapped\n    return f(self, context, *args, **kw)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 286, in decorated_function\n    pass\n', '  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__\n    six.reraise(self.type_, self.value, self.tb)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 272, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 314, in decorated_function\n    kwargs[\'instance\'], e, sys.exc_info())\n', '  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__\n    six.reraise(self.type_, self.value, self.tb)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 302, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 4201, in reserve_block_device_name\n    return do_reserve()\n', '  File "/opt/stack/nova/nova/openstack/common/lockutils.py", line 249, in inner\n    return f(*args, **kwargs)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 4188, in do_reserve\n    context, instance, bdms, device)\n', '  File "/opt/stack/nova/nova/compute/utils.py", line 106, in get_device_name_for_instance\n    mappings[\'root\'], device)\n', '  File "/opt/stack/nova/nova/compute/utils.py", line 155, in get_next_device_name\n    raise exception.InvalidDevicePath(path=root_device_name)\n', 'InvalidDevicePath: The supplied device path (vda) is invalid.\n']

  The reason behind this issue is: because of the root device_name being
  set 'vda' in the case of boot from volume, The future volume attaches
  to the VM fail saying "The supplied device path (vda) is invalid"

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