Comment 10 for bug 921774

Reviewed: https://review.openstack.org/12395
Committed: http://github.com/openstack/nova/commit/75f69225c5be5e5817a4008792e974ba4014c9e1
Submitter: Jenkins
Branch: stable/essex

commit 75f69225c5be5e5817a4008792e974ba4014c9e1
Author: Boris Filippov <email address hidden>
Date: Wed Sep 5 05:40:05 2012 +0400

    Use bare container format by default

    Set container_format to bare during libvirt snapshot, when VM image in
    glance was deleted. Currently, if VM image in glance was already deleted
    before snapshot, nova will attempt to create snapshot image with
    container_format: None. This cause glance to return error on attempt to
    upload snapshot. According to glance docs container_format is not used
    anywhere in glance or nova explicitly and it is safe to set it to bare,
    when you are unsure which container_format you need to use.
    Current snapshot logic sets snapshot disk_format to currently used
    image_format in absence of base image in glance.

    This resolves bug 921774 without need for snapshot mechanism redesign.

    Change-Id: I7beea35120aaeac0837daecdf58f38f62e24454c