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Libvirt 6.0 now requires that every disk in the backing chain has an explicit backing format. For example this will be rejected by libvirt: qemu-img create -f qcow2 -b backing-disk disk.qcow2 with the error: Original error from libvirt: Requested operation is not valid: format of backing image 'backing-disk' of image 'disk.qcow2' was not specified in the image metadata (See https://libvirt.org/kbase/backing_chains.html for troubleshooting) [code=55 int1=-1] Instead you have to use the -F option to specify the format, eg: qemu-img create -f qcow2 -b backing-disk -F raw disk.qcow2
Libguestfs is tools and a library for accessing and modifying guest disk images. For more information see the home page: http://libguestfs.org/ For discussion, development, patches, etc. please use the mailing list: http://www.redhat.com/mailman/listinfo/libguestfs To find out how to build libguestfs from source, read: docs/guestfs-building.pod http://libguestfs.org/guestfs-building.1.html man docs/guestfs-building.1 Copyright (C) 2009-2019 Red Hat Inc. The library is distributed under the LGPLv2+. The programs are distributed under the GPLv2+. Please see the files COPYING and COPYING.LIB for full license information. The examples are under a very liberal license.