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由 Max Reitz 提交于
It does not make much sense to use a backing image for the target when you concatenate multiple images (because then there is no correspondence between the source images' backing files and the target's); but it was still possible to give one by using -o backing_file=X instead of -B X. Fix this by moving the check. (Also, change the error message because -B is not the only way to specify the backing file, evidently.) Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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