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ref: bb7cbd717363d9cc12430d406f63e9d6a7e64a62
dir: /sys/src/cmd/disk/test/basic.rc/

#!/bin/rc

# read fresh disk
../$O.qcowfs -n 4294967296 /tmp/qcow
dd -ibs 389120 -skip 1 -obs 8192 -count 1 < /mnt/qcow/data >/dev/null
../$O.qcowfs -n 4294967296 /tmp/qcow
dd -ibs 389120 -skip 1 -obs 15473 -count 1 < /mnt/qcow/data >/dev/null

# write
../$O.qcowfs -n 4294967296 /tmp/qcow
dd -ibs 389120 -skip 1 -obs 8192 -count 1 -if /dev/random -of /mnt/qcow/data # start, power of two
dd -ibs 389120 -skip 1 -obs 15473 -count 1 -if /dev/random -of /mnt/qcow/data # random prime
dd -ibs 389120 -skip 1 -obs 8192 -seek 524287 -count 1 -if /dev/random -of /mnt/qcow/data  # end

# read written disk
dd -ibs 389120 -skip 1 -obs 8192 -count 1 < /mnt/qcow/data >/dev/null
dd -ibs 389120 -skip 1 -obs 15473 -count 1 < /mnt/qcow/data >/dev/null

# read and write some data
cat /bin/cat > /mnt/qcow/data
sz = `{walk -es /bin/cat}
xhash=`{cat /bin/cat | sha1sum}
rhash=`{read -c $sz /mnt/qcow/data | sha1sum}
if(! ~ $xhash $rhash){
	>[1=2] echo mismatched data
	exit mishash
}
exit ''