#!/bin/sh -eux

case "$PACKER_BUILDER_TYPE" in
  qemu) exit 0 ;;
esac

major_version="`uname -r | awk -F. '{print $1}'`";

if [ "$major_version" -eq 10 ]; then
  ZROOT="zroot"
else
  ZROOT="zroot/ROOT/default"
fi

COMPRESSION=$(zfs get -H compression $ZROOT | cut -f3);

zfs set compression=off $ZROOT;
dd if=/dev/zero of=/EMPTY bs=1m &
PID=$!;

avail=$(zfs get -pH avail $ZROOT | cut -f3);
while [ "$avail" -ne 0 ]; do
  sleep 15;
  avail=$(zfs get -pH avail $ZROOT | cut -f3);
done

kill $PID || echo "dd already exited";

rm -f /EMPTY;
# Block until the empty file has been removed, otherwise, Packer
# will try to kill the box while the disk is still full and that's bad
sync;
zfs set compression=$COMPRESSION $ZROOT;