#!/bin/bash
#################################################################################
#                                                                               #
# iscsi-ha - High Availability framework for iSCSI cluster used in conjunction  #
# with XAPI based Xen Virtualization Environment (Xen Cloud Platform/XenServer) #
# Copyright 2017 Salvatore Costantino                                           #
# ha@pulsesupply.com                                                            #
#                                                                               #
#                                                                               #
#    iscsi-ha is free software: you can redistribute it and/or modify           #
#    it under the terms of the GNU General Public License as published by       #
#    the Free Software Foundation, either version 3 of the License, or          #
#    (at your option) any later version.                                        #
#                                                                               #
#    iscsi-ha is distributed in the hope that it will be useful,                #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of             #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
#    GNU General Public License for more details.                               #
#                                                                               #
#    You should have received a copy of the GNU General Public License          #
#    along with iscsi-ha.  If not, see <http://www.gnu.org/licenses/>.          #
#                                                                               #
#################################################################################

ERROR_MESSAGE_LIST=""
DEVICE_LIST=$(smartctl --scan | awk {'print $1'})

for disk in ${DEVICE_LIST}
do
	echo "Found device $disk"
done

############################
## Bit mask error messages
############################
BIT_0='Command line did not parse.'
BIT_1='Device open failed, device did not return an IDENTIFY DEVICE structure, or device is in a low-power mode (see ´-n´ option above).'
BIT_2='Some SMART or other ATA command to the disk failed, or there was a checksum error in a SMART data structure (see ´-b´ option above).'
BIT_3='SMART status check returned "DISK FAILING".'
BIT_4='We found prefail Attributes <= threshold.'
BIT_5='SMART status check returned "DISK OK" but we found that some (usage or prefail) Attributes have been <= threshold at some time in the past.'
BIT_6='The device error log contains records of errors.'
BIT_7='The device self-test log contains records of errors.  [ATA only] Failed self-tests outdated by a newer successful extended self-test are ignored.'

for device in ${DEVICE_LIST[@]}
do
	smartctl -q silent $device
	RETVAL=$?
	for ((i=0; i<8; i++))
	do
		THIS_BIT_VALUE=$((RETVAL & 2**i && 1))
		if [ $THIS_BIT_VALUE -ne 0  -a $i -ne 0 -a $i -ne 1 ]
		then
			ERROR_MESSAGE="BIT_$i"
			ERROR_MESSAGE_LIST+="${!ERROR_MESSAGE}\n"
		fi
		echo "$device: Bit $i = [ $THIS_BIT_VALUE ]"
	done
done

if [ ${#ERROR_MESSAGE_LIST} -gt 0 ]
then
	## We have errors - log, print, email?
	echo -e $ERROR_MESSAGE_LIST
	exit 1
fi