stitch xva's Ref/* files into raw image

xva2raw.sh

#!/bin/bash
# stolen from now defunct http://wiki.sysconfig.org.uk/display/howto/Convert+Citrix+XenServer+images+to+plain+Xen
#
# To summarize the .xva format:
# - it's a tar file
# - it contains a folder
# - the folder contains chunks of 1MB each
# - they can be concatenated, but blank space needs to be filled

dd if=/dev/zero of=blank bs=1024 count=1k
test -f image.img && rm -f image.img
touch image.img

max=`ls ???????? | sort | tail -n1`

for i in `seq 0 $max`; do
    fn=`printf "%08d" $i`
    echo -n "$fn of $max"
    if [ -f "$fn" ]; then
        echo " - appending chunk"
        cat $fn >> image.img
    else
        echo " - filling blank"
        cat blank >> image.img
    fi
done

rm -f blank

echo "Done."