block: Add 'base-node' parameter to the 'block-stream' command
The way to specify the node from which to copy data in the block-stream operation is by using the 'base' parameter. This parameter however takes a file name, not a node name. Since we want to be able to perform this operation using only node names, this patch adds a new 'base-node' parameter. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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