Eric Blake a7cd44bef3 qemu-img: Improve error for rebase without backing format
When removeing support for qemu-img being able to create backing
chains without embedded backing formats, we caused a poor error
message as caught by iotest 114.  Improve the situation to inform the
user what went wrong.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210708155228.2666172-1-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-07-09 13:19:09 +02:00
..
2021-07-04 14:04:12 +01:00
2021-03-22 18:58:19 -04:00
2021-06-03 14:09:03 -07:00
2021-07-06 08:33:51 +02:00