#!/bin/bash
HDD="/dev/sda"
DATA="${HDD}2"
SWAP="${HDD}1"
DATAMOUNT="/data"
PART_TABLE="/root/ClusterPartitions.sfdisk"
HDD_WHIPE_KEYWORD="KillHDD"

# First, we check the kernel command line to make sure we want to mangle the HDDs:
dmesg | grep -q "^Kernel command line.*${HDD_WHIPE_KEYWORD}"
if [ $? != 0 ]
then
	echo "Quitting HDD whipe procedure since ${HDD_WHIPE_KEYWORD} is not in kernel command line"
	exit 2
fi

# check to see if the disk exists
if [ -b $HDD ]
then
	mount ${DATA} ${DATAMOUNT}
	if [ ! -e /data/$(echo $HOSTNAME) ]
	then
		# The HDD is not tagged therefore:
		# 0- We unmount, just in case there was another FS
		umount ${DATAMOUNT}
		# 1- We partition it:
		sfdisk --force /dev/sda < ${PART_TABLE}
		# 2- We format the partition we want to use as data
		mkreiserfs -f -f --label "DATA" -q ${DATA}
		# 3- We also kept some spare space for eventual use of swap
		mkswap ${SWAP}
		# 4- Now we mount the disk
		mount ${DATA} ${DATAMOUNT}
		# 5- We tag the disk with the hostname
		touch /data/$(echo $HOSTNAME)
	else
		echo "Found the file tag /data/$(echo $HOSTNAME), not formatting the drive!"
	fi
else
	echo "The data disk (${HDD}) is missing!"
	echo "Removing ${DATAMOUNT} so no one fills up the ram (unionfs here)"
	rmdir ${DATAMOUNT}
	exit 1
fi

#swapon ${SWAP}