Submitter: Jenkins
Branch:    master

commit 0683fcd3f551dc55438d9f8415b8931f22635bd5
Author: Giridhar Jayavelu <>
Date:   Wed Mar 9 14:10:49 2016 -0800

    Handle TypeError when disabling host service
    When _set_host_enabled() in virt/libvirt/
    is called to change service status of a host from
    enabled to disabled without providing disable_reason, then
    a TypeError occurs while concatenating disabled_reason with
    DISABLE_PREFIX. This prevents the service status of the host
    from being updated.
    This patch handles the case when disable_reason is None.
    Also, unit tests have been fixed to validate the code path for
    changing the disabled state of a host.
    Closes-Bug: #1623738
    Change-Id: Ib131f73444234723ef8bbb15bb4bd4a62a83320d

** Changed in: nova
       Status: In Progress => Fix Released

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  Disabled state of host is not updated when reason is not provided.

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  When _set_host_enabled() in virt/libvirt/
  is called to disable service status of a host without
  providing disabled_reason, then "TypeError: cannot concatenate 'str' and
  'NoneType' objects" is raised. This prevents the disabled state getting 

  Before concatenating disable_reason with DISABLE_PREFIX, 
  disabled_reason should be checked if it is defined or not.

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