The NFS driver uses qcow2 images with backing files to represent
volume snapshots, which is not allowed for qcow2 disk images
downloaded from glance. The driver uses cinder.image_utils to
convert a qcow2 snapshot to a raw volume; this was not a problem
for the first snapshot, whose backing file is raw, and hence passed
the image format inspector, but the second snapshot has a qcow2
backing file, which the image_utils were rejecting as a security
risk. Thus we now pass the qemu_img_info from the backing image as
an additional parameter to the image convert call, which indicates
that the file has already been screened and allows the conversion
to occur.
Co-authored-by: Fernando Ferraz <fesilva@redhat.com>
Co-authored-by: Brian Rosmaita <rosmaita.fossdev@gmail.com>
Closes-bug: #2074377
Change-Id: I49404e87eb0c77b4ed92918404f86c073fbfd713
9687fbac79