CONF.libvirt.snapshot_image_format does not always default to format of source image

Bug #1793351 reported by David Rabel on 2018-09-19
This bug affects 2 people
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
David Rabel

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

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.

Fix proposed to branch: master

Changed in nova:
assignee: nobody → David Rabel (rabel-b1)
status: New → In Progress

Change abandoned by David Rabel (<email address hidden>) on branch: master

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