New update-prey to put on /etc/cron.daily

#!/bin/sh

# Instructions
# Just put this script on /etc/cron.daily and set eXecute permission

# ChangeLog
# Added $ARCH variable
# Added support for new Ubuntu which use Systemd instead of Upstart, so move initctl off and back is a workaround.
# Added a log message
# Fixed a bug. Originally "mv /sbin/initctl{,-hidden}" and "mv /sbin/initctl{-hidden,}" may be don't work, so I put the full command and all works now.

ARCH=amd64
CURRENT_VERSION=$(dpkg-query -W -f='${Version}\n' prey)
PACKAGE_VERSION=$(curl -s https://s3.amazonaws.com/prey-releases/node-client/latest.txt)
if [ "$CURRENT_VERSION" != "$PACKAGE_VERSION" ]; then
wget -q -O"/tmp/prey.deb" https://s3.amazonaws.com/prey-releases/node-client/"$PACKAGE_VERSION"/prey_"$PACKAGE_VERSION"_$ARCH.deb
mv /sbin/initctl /sbin/initctl-hidden
dpkg -i /tmp/prey.deb >/dev/null 2>/dev/null
mv /sbin/initctl-hidden /sbin/initctl
rm -f /tmp/prey.deb
logger "Prey Auto-Theft updated from $CURRENT_VERSION to $PACKAGE_VERSION"
fi
exit 0