[Bug 1639239] Fix included in openstack/nova 15.0.0.0b2

[OpenStack Infra]

This issue was fixed in the openstack/nova 15.0.0.0b2 development
milestone.

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https://bugs.launchpad.net/bugs/1639239

Title:
  ValueError for Invalid InitiatorConnector in s390

Status in Ubuntu Cloud Archive:
  Confirmed
Status in Ubuntu Cloud Archive newton series:
  Confirmed
Status in OpenStack Compute (nova):
  Fix Released
Status in os-brick:
  Fix Released
Status in nova package in Ubuntu:
  Fix Released
Status in python-os-brick package in Ubuntu:
  Fix Released
Status in nova source package in Yakkety:
  Confirmed
Status in python-os-brick source package in Yakkety:
  Confirmed
Status in nova source package in Zesty:
  Fix Released
Status in python-os-brick source package in Zesty:
  Fix Released

Bug description:
  Description
  ===========
  Calling the InitiatorConnector factory results in a ValueError for unsupported protocols, which goes unhandled and may crash a calling service.

  Steps to reproduce
  ==================
  - clone devstack
  - make stack

  Expected result
  ===============
  The nova compute service should run.

  Actual result
  =============
  A ValueError is thrown, which, in the case of the nova libvirt driver, is not handled appropriately. The compute service crashes.

  Environment
  ===========
  os|distro=kvmibm1
  os|vendor=kvmibm
  os|release=1.1.3-beta4.3
  git|cinder|master[f6ab36d]
  git|devstack|master[928b3cd]
  git|nova|master[56138aa]
  pip|os-brick|1.7.0

  Logs & Configs
  ==============
  [...]
  2016-11-03 17:56:57.204 46141 INFO nova.virt.driver [req-fb30a5af-e87c-4ee0-903c-a5aa7d3ad5e3 - -] Loading compute driver 'libvirt.LibvirtDriver'
  2016-11-03 17:56:57.442 46141 DEBUG os_brick.initiator.connector [req-fb30a5af-e87c-4ee0-903c-a5aa7d3ad5e3 - -] Factory for ISCSI on s390x factory /usr/lib/python2.7/site-packages/os_brick/initiator/connector.py:261
  2016-11-03 17:56:57.444 46141 DEBUG os_brick.initiator.connector [req-fb30a5af-e87c-4ee0-903c-a5aa7d3ad5e3 - -] Factory for ISCSI on s390x factory /usr/lib/python2.7/site-packages/os_brick/initiator/connector.py:261
  2016-11-03 17:56:57.445 46141 DEBUG os_brick.initiator.connector [req-fb30a5af-e87c-4ee0-903c-a5aa7d3ad5e3 - -] Factory for ISER on s390x factory /usr/lib/python2.7/site-packages/os_brick/initiator/connector.py:261
  2016-11-03 17:56:57.445 46141 CRITICAL nova [req-fb30a5af-e87c-4ee0-903c-a5aa7d3ad5e3 - -] ValueError: Invalid InitiatorConnector protocol specified ISER
  2016-11-03 17:56:57.445 46141 ERROR nova Traceback (most recent call last):
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/usr/bin/nova-compute", line 10, in <module>
  2016-11-03 17:56:57.445 46141 ERROR nova     sys.exit(main())
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/cmd/compute.py", line 56, in main
  2016-11-03 17:56:57.445 46141 ERROR nova     topic=CONF.compute_topic)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/service.py", line 216, in create
  2016-11-03 17:56:57.445 46141 ERROR nova     periodic_interval_max=periodic_interval_max)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/service.py", line 91, in __init__
  2016-11-03 17:56:57.445 46141 ERROR nova     self.manager = manager_class(host=self.host, *args, **kwargs)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/compute/manager.py", line 537, in __init__
  2016-11-03 17:56:57.445 46141 ERROR nova     self.driver = driver.load_compute_driver(self.virtapi, compute_driver)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/virt/driver.py", line 1625, in load_compute_driver
  2016-11-03 17:56:57.445 46141 ERROR nova     virtapi)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 44, in import_object
  2016-11-03 17:56:57.445 46141 ERROR nova     return import_class(import_str)(*args, **kwargs)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 356, in __init__
  2016-11-03 17:56:57.445 46141 ERROR nova     self._get_volume_drivers(), self._host)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/virt/driver.py", line 44, in driver_dict_from_config
  2016-11-03 17:56:57.445 46141 ERROR nova     driver_registry[driver_type] = driver_class(*args, **kwargs)
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/opt/stack/nova/nova/virt/libvirt/volume/iser.py", line 34, in __init__
  2016-11-03 17:56:57.445 46141 ERROR nova     transport=self._get_transport())
  2016-11-03 17:56:57.445 46141 ERROR nova   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connector.py", line 285, in factory
  2016-11-03 17:56:57.445 46141 ERROR nova     raise ValueError(msg)
  2016-11-03 17:56:57.445 46141 ERROR nova ValueError: Invalid InitiatorConnector protocol specified ISER
  2016-11-03 17:56:57.445 46141 ERROR nova

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