Public bug reported:
It seems to be intended, that CONF.libvirt.snapshot_image_format defaults to
the format of the source image.
That is also what the docs say. See for example
https://docs.openstack.org/nova/latest/configuration/sample-config.html
If the format of the source image is raw, the raw image is only used as
a backing file with a qcow2 overlay. So find_disk() from nova's libvirt
utils will return the overlay file and qcow2 as a format.
What we want to use here is the format of the backing file.
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1793351
Title:
CONF.libvirt.snapshot_image_format does not always default to format
of source image
Status in OpenStack Compute (nova):
New
Bug description:
It seems to be intended, that CONF.libvirt.snapshot_image_format defaults to
the format of the source image.
That is also what the docs say. See for example
https://docs.openstack.org/nova/latest/configuration/sample-config.html
If the format of the source image is raw, the raw image is only used
as a backing file with a qcow2 overlay. So find_disk() from nova's
libvirt utils will return the overlay file and qcow2 as a format.
What we want to use here is the format of the backing file.
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