Qemu-nbd does not perform well with older versions of qemu due to
the lack of writeback caching mode. It also only builds qcow2 images
and there is a desire for raw image support. Finally, qemu-nbd makes
it very difficult to build images concurrently due to the somewhat
opaque nature of how it selects a /dev/nbd# device. losetup, on
the other hand, makes this process very straight forward.
Change-Id: I309fad8af4fd1e8d1720c17b65e1897a76d5e897
Co-Author: Clint Byrum <clint@fewbar.com>
The element vm is the only one creating a partition in the disk.
If not included, it will ask for sudo password to format or mount
the whole nbd disk or disks with multiple partitions.
Change-Id: Iac0987d2088433873b7cbb68deecc9254b2d0103
