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6be8787273
qemu 6.1 has decided to change qemu-img create so that a backing format (-F) is required if a backing file (-b) is specified. Since we don't want to change the libguestfs API to force callers to specify this because that would be an API break, autodetect it. This is similar to commitc8c181e8d9("launch: libvirt: Autodetect backing format for readonly drive overlays"). Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1998820 (cherry picked from commit45de287447)
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) 2009-2020 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.