Comment 4 for bug 1385484

Reviewed: https://review.openstack.org/130905
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=296d92bd44d1b8eb161f94f70cba5db4d17f8f65
Submitter: Jenkins
Branch: master

commit 296d92bd44d1b8eb161f94f70cba5db4d17f8f65
Author: Fei Long Wang <email address hidden>
Date: Sat Oct 25 10:05:57 2014 +1300

    Fix nova-compute start issue after evacuate

    After evacuated successfully, and restarting the failed
    host to get it back, Nova will call init_host() and then
    call method _destroy_evacuated_instances(). In method
    _destroy_evacuated_instances(), nova will check again if
    the storage is shared or not to decide if the storage
    should be destroyed. Now nova is using temp file to check
    if it's shared file system, but it's wrong for RBD case.
    So Nova will attempt to delete the shared block storage,
    which will fail since it's used by the new instance. This
    patch fixes this issue and adds test cases for that.

    Closes-Bug: 1385484

    Change-Id: I71bb818f3c2930b3a2ddf1817dfd4bb61fae7e98