#!/bin/sh
echo "please enter hostname (fqdn) of the system to restore (without spaces!)"
read HOST;

echo "overview of existing devices and partitions:"
echo ""
cat /proc/partitions
echo ""

cat /proc/partitions > partitions_temp

grep sda1 partitions_temp || grep cciss/c0d0p1 partitions_temp

if [ $? == 1 ]
then
        echo "no partitions on system found"
        rm partitions_temp
else
        echo "partitions on system found!"
	echo "Please delete system-partitions with fdisk (check Wiki for instructions) and rerun the restore.sh script."
        rm partitions_temp
        exit 1
fi

echo ""
echo "overview of existing LVM-setup:"
echo ""

pvscan
vgscan
lvscan
echo ""

pvscan > pv_temp
grep PV pv_temp

if [ $? == 1 ]
then
	echo "no physical volumes found"
	rm pv_temp
else
        echo "physical volumes found, please remove LVM-setup and rerun restore.sh"
        rm pv_temp
	exit 1
fi


echo "please enter device name to restore partition-table (without spaces!). example: sda , cciss/c0d0"
echo ""
read DEV;

DEV_FORM=`echo $DEV | sed 's/cciss\/c0d/cciss_c0d/g'`

cat /proc/partitions > /mnt/backup/${HOST}/check_part
grep cciss /mnt/backup/${HOST}/check_part

if [ $? == 1 ]
then
        echo "sda-device found"
	rm /mnt/backup/${HOST}/check_part
        sfdisk --force /dev/$DEV < /mnt/backup/${HOST}/dev_${DEV}_part_table
else
	echo "cciss-device found"
	rm /mnt/backup/${HOST}/check_part
	sfdisk --force /dev/$DEV < /mnt/backup/${HOST}/dev_${DEV_FORM}_part_table	
fi


echo "please enter the name of the partition to restore LVM (without spaces!). example: sda2 , cciss/c0d0p2 , cciss/c0d1p2 ..."
echo ""
read PART;
echo "please enter the name of the volume-group to restore (without spaces!). example: system, data .."
echo ""
read PV;
echo "please enter the name of the boot-device (without spaces!). example: sda1 , cciss/c0d0p1 .."
echo ""
read BOOT;

ID=`grep -m 2 "id = " /mnt/backup/${HOST}/${PV}_vgcfgbackup.bku |tail -n 1 | cut -f2 -d'"'`
echo "ID=$ID"
echo "PV=$PV"
echo "DEV=$DEV"
echo "PART=$PART"

echo "restoring PV"
pvcreate --uuid $ID --restorefile /mnt/backup/${HOST}/${PV}_vgcfgbackup.bku /dev/$PART	
echo "restoring VG/ LV"
vgcfgrestore --file /mnt/backup/${HOST}/${PV}_vgcfgbackup.bku $PV
vgchange -ay

lvscan

echo "format all devices:"

mkfs.ext3 -Lhome /dev/$PV/home
mkfs.ext3 -Lroot /dev/$PV/root
mkswap -Lswap /dev/$PV/swap
mkfs.ext3 -Ltmp /dev/$PV/tmp 
mkfs.ext3 -Lusr /dev/$PV/usr
mkfs.ext3 -Lvar /dev/$PV/var
mkfs.ext3 -Lboot /dev/${BOOT}

echo "creating root-mountpoint"
echo""

mkdir /mnt/root

mount /dev/$PV/root /mnt/root
cd /mnt/root
echo "restoring root:"
tar -xzf /mnt/backup/$HOST/root.tgz

if [ $? == 1 ]
then
	echo ################################################
        echo "restore of root-backup failed"
	echo ################################################
        exit
else
	echo ################################################
	echo "root-backup restored"
	echo ################################################
fi

echo "mounting var, usr, home, tmp, boot"

mount /dev/$PV/var var
mount /dev/$PV/usr usr
mount /dev/$PV/home home
mount /dev/$PV/tmp tmp
mount /dev/${BOOT} boot

echo ################################################
echo "restore var"
echo ################################################
tar -xzf /mnt/backup/$HOST/var.tgz
echo "var-backup restored"

echo ################################################
echo "restore usr"
echo ################################################
tar -xzf /mnt/backup/$HOST/usr.tgz
echo "usr-backup restored"

echo ################################################
echo "restore home"
echo ################################################
tar -xzf /mnt/backup/$HOST/home.tgz
echo "home-backup restored"

echo ################################################
echo "restore boot"
echo ################################################
tar -xzf /mnt/backup/$HOST/boot.tgz
echo "home-backup restored"

echo ################################################
echo "install mbr"
echo ################################################
grub --batch <<EOT
device (hd0) /dev/$DEV
root (hd0,0)
setup (hd0)
quit
EOT

echo ""

file=/mnt/root/etc/udev/rules.d/70-persistent-net.rules
if [  -e $file ]
then
	echo "edit "70-persistent-net.rules""
	echo "" > /mnt/root/etc/udev/rules.d/70-persistent-net.rules
	echo "70-persistent-net.rules edited"
fi

cd /

echo ""

umount /dev/$PV/var
umount /dev/$PV/usr
umount /dev/$PV/home
umount /dev/$PV/tmp
umount /dev/${BOOT}
umount /dev/$PV/root

echo ""

fsck /dev/$PV/var 
fsck /dev/$PV/usr
fsck /dev/$PV/home
fsck /dev/$PV/tmp
fsck /dev/${BOOT}
fsck /dev/$PV/root

echo ""


echo "restore of $HOST done"

mount /dev/$PV/root /mnt/root
mount /dev/$PV/var var
mount /dev/$PV/usr usr
mount /dev/$PV/home home
mount /dev/$PV/tmp tmp
mount /dev/${BOOT} boot

chmod 1777 tmp

echo ""

echo "please remove (out-commenting) all non-system /mnt/root/etc/fstab entries with vi before restart the system! example: /opt/oracle , /opt/whatever/ ..."