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
Although we have long supported 'qemu-img convert -o backing_file=foo,backing_fmt=bar', the fact that we have a shortcut -B for backing_file but none for backing_fmt has made it more likely that users accidentally run into: qemu-img: warning: Deprecated use of backing file without explicit backing format when using -B instead of -o. For similarity with other qemu-img commands, such as create and compare, add '-F $fmt' as the shorthand for '-o backing_fmt=$fmt'. Update iotest 122 for coverage of both spellings. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20210913131735.1948339-1-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>