Created attachment 786110 [details]
Reproducer

Description of problem:
ActionDestroyDevice with a LUKS device does not behave as expected. The device is destroyed (closed in this case), but an exception is thrown. More details below.


Version-Release number of selected component (if applicable):
python-blivet-0.19-1.fc20.noarch


How reproducible:
Always.


Steps to Reproduce:
1. Create and open a LUKS partition
2. Run the reproducer (change uuid in code as necessary)
3. Observe an exception


Actual results:
DeviceTreeError                           Traceback (most recent call last)
/usr/lib/python2.7/site-packages/IPython/utils/py3compat.pyc in execfile(fname, *where)
    176             else:
    177                 filename = fname
--> 178             __builtin__.execfile(filename, *where)

/home/jsynacek/openlmi-storage-nfs/blivet-luks-bug3.py in <module>()
     19 action = blivet.ActionDestroyDevice(luksdevice)
     20 # exception here
---> 21 b.devicetree.registerAction(action)
     22 print "YOU CAN'T SEE ME"
     23 b.devicetree.processActions([actions])

/usr/lib/python2.7/site-packages/blivet/devicetree.pyc in registerAction(self, action)
    341         if not (action.isCreate and action.isDevice) and \
    342            action.device not in self._devices:
--> 343             raise DeviceTreeError("device is not in the tree")
    344         elif (action.isCreate and action.isDevice):
    345             if action.device in self._devices:

DeviceTreeError: device is not in the tree


Expected results:
The LUKS device is closed without any exceptions as expected.


Additional info:
Note that even though the code throws an exception, the LUKS device *gets closed*.