#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

. /scripts/functions
. /scripts/local

if grep "setup-snapshot=0" /proc/cmdline; then
	exit 0
fi

if [ "x$ROOT" = "x" ]; then
	echo "urbackup-setup-snapshot: root device not defined. Not setting up snapshotting." > /dev/kmsg
	exit 0
fi

if echo "$ROOT" | grep "root-98d1f8b1f435"; then
	panic "urbackup-setup-snapshot: Root device is snapshot (clobbered: $ROOT). Please edit root= boot parameter to be the root device and add 'setup-snapshot=0' to boot parameters to fix boot. Then run 'update-grub' to fix grub config."
	exit 0
fi

RBD=$(resolve_device "$ROOT")

if [ "x$RBD" = "x" ]; then
	echo "urbackup-setup-snapshot: root device not found. Not setting up snapshotting." > /dev/kmsg
	exit 0
fi

echo "urbackup-setup-snapshot: root block device $RBD" > /dev/kmsg

RBD_SIZE=$(blockdev --getsz $RBD)

echo "0 $RBD_SIZE linear $RBD 0" | dmsetup create root-98d1f8b1f435 2> /dev/kmsg

echo "export ROOT=/dev/mapper/root-98d1f8b1f435" > /conf/param.conf