bootstrap a GCE persistent disk w/ raw data

pdstrap.sh

#!/bin/bash
set -ex

USAGE='usage: dd if=<source> | DISK= BUCKET= [ZONE= SIZE=] pdstrap.sh'
DISK=${DISK:?missing ${USAGE}}
BUCKET=${BUCKET:?missing ${USAGE}}
ZONE=${ZONE:-us-central1-a}
SIZE=${SIZE:-200}
TMPDIR=$(mktemp -d)

dd of=${TMPDIR}/disk.raw
tar -Szcf ${TMPDIR}/${DISK}.tar.gz -C ${TMPDIR} disk.raw
gsutil cp ${TMPDIR}/${DISK}.tar.gz gs://${BUCKET}/
gcutil addimage ${DISK} gs://${BUCKET}/${DISK}.tar.gz
gcutil adddisk ${DISK} --size=${SIZE} --source_image=${DISK} --zone=${ZONE}
echo disk ${DISK} created
echo "create similar disk with: \`gcutil adddisk <disk name> --size=<disk size> --source_image=${DISK}\`"