#!/bin/bash
#################################################################################
#                                                                               #
# iscsi-ha - High Availability framework for iSCSI cluster used in conjunction  #
# with XAPI based Xen Virtualization Environment (Xen Cloud Platform/XenServer) #
# Copyright 2021 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/>.          #
#                                                                               #
#################################################################################
clear
echo "#################################################################################################"
echo "#################################################################################################"
echo "## iscsi-ha uninstaller - removes iscsi-ha, mail and sendmail (if chosen)                      ##"
echo "##                                                                                             ##"
echo "#################################################################################################"
echo "#################################################################################################"

############################
# Make sure this is an XCP
# or XenServer host
# before continuing
############################
RELEASE=`cat /etc/redhat-release`
if [ $? != "0" ]
then
	RELEASE=UNKNOWN
fi

if [[ $RELEASE == XCP* ]] || [[ $RELEASE == XenServer* ]]
then
	echo "Host relese version = $RELEASE"
else
        echo "This host release ($RELEASE) not detected as an XCP or XenServer host"
        echo "continue anyway? <CTRL + C> to exit OR <Enter> to continue"
        read n1
fi

#############################
# Check if sendmail and mailx
#############################

echo "Checking if sendmail is installed"
CHECK_SENDMAIL=`rpm -qa | grep sendmail`
if [ $CHECK_SENDMAIL ]
then
	echo "sendmail installation found: $CHECK_SENDMAIL"
	echo "Sendmail may have been installed with iscsi-ha. Would you like to remove sendmail from this host? <yes or no>"
	read UNINSTALL_SENDMAIL
	if [ $UNINSTALL_SENDMAIL = "yes" ]
        then
                ((yum remove sendmail -y) 1>/dev/null)
                if [ $? = "0" ]
                then
                        echo "Successfully removed sendmail"
                else
                        echo "Error removing sendmail"
                fi
        else
                echo "Skipping sendmail removal"
        fi
else
	echo "Sendmail not install on this host"
fi
	
echo "Checking if mailx is installed"
CHECK_MAILX=`rpm -qa | grep mailx`
if [ $CHECK_MAILX ]
then
        echo "mailx installation found: $CHECK_MAILX"
        echo "mailx may have been intalled with iscsi-ha. Would you like to remove mailx from this host? <yes or no>"
        read UNINSTALL_MAILX
        if [ $UNINSTALL_MAILX = "yes" ]
        then
                ((yum remove mailx -y) 1>/dev/null)
                if [ $? = "0" ]
                then
                        echo "Successfully removed mailx"
                else
                        echo "Error removing mailx"
                fi
        else
                echo "Skipping mailx removal"
        fi
else
        echo "mailx not install on this host"
fi

echo "Would you like to keep a copy of the iscsi-ha configuration file in /tmp? <yes or no>"
read KEEP_CONFIG
if [ $KEEP_CONFIG = "yes" ]
then
	cp /etc/iscsi-ha/iscsi-ha.conf /tmp
	if [ $? = "0" ]
	then
		echo "Configuration file saved in /tmp"
	fi
fi

echo "Removing all iscsi-ha files and application. Continue? <yes or no>"
read REMOVE
if [ $REMOVE = "yes" ]
then
	rm -f /etc/bash_completion.d/iscsi-cfg.tab
        if [ -h /bin/iscsi-cfg ]
        then
                echo "Removing symbolic link for CLI tool"
                rm -f /bin/iscsi-cfg
        fi

	chkconfig --del iscsi-ha
	chkconfig --del iscsi-ha-watchdog
	service iscsi-ha stop -w
	rm -rf /etc/iscsi-ha && rm -f /etc/init.d/iscsi-ha && rm -f /etc/init.d/iscsi-ha-watchdog
	if [ $? = 0 ] 
	then
		echo "iscsi-ha successfully removed"
	fi
fi

echo "Finished"