Re: [Libguestfs] [PATCH nbdkit] tests: Convert some tests to use nbdsh instead of qemu-io.

nbdsh has some advantages over qemu-io: - scriptable - allows us to more finely control NBD commands, such as making subsector-sized requests and controlling how many commands are sent on the wire - can write controlled patterns - can read NBD export flags

# Because error rate is 0%, reads should never fail. -qemu-io -r -f raw "nbd+unix://?socket=$sock" \ - -c "r 0M 10M" \ - -c "r 20M 10M" \ - -c "r 40M 10M" \ - -c "r 60M 10M" +nbdsh --connect "nbd+unix://?socket=$sock" \ + -c 'mbytes = 2**20' \ + -c 'h.pread(10*mbytes, 0)' \ + -c 'h.pread(10*mbytes, 20*mbytes)' \ + -c 'h.pread(10*mbytes, 40*mbytes)' \ + -c 'h.pread(10*mbytes, 60*mbytes)'