#!/bin/bash

DISK_UUID="12E6B87AE6B86021"
IQN="iqn.2000-01.com.synology:SR3.VMs"
PORTAL_IP="192.168.0.3"
MOUNT_DIR="/home/dunestorm/VMs"

show_usage (){
	echo "Please use either '-m (--mount)' to mount or '-u (--umount)' to unmount this volume."
	echo "The use of '-s (--status)' is additionally an option."
	exit 1;
}

check_dir (){
	file_count=$(ls $MOUNT_DIR/. | wc -l)

	if [ "$file_count" -ge 1 ]
	then
		echo ""
		echo "Directory is mounted at:" $MOUNT_DIR
	else
		echo ""
		echo "Directory is un-mounted from:" $MOUNT_DIR
	fi
}

# Check for admin rights
if [[ $EUID -ne 0 ]]
then
	echo "You may only mount as root, please re-run with appropriate permissions."
	exit 1;
fi

# Process input parameters
while (( "$#" )); do
	case "$1" in
		-m|--mount)
			echo "[Attempting to mount iSCSI volume]"
			iscsiadm --mode node --targetname $IQN --portal $PORTAL_IP --login
			sleep 3
			mount /dev/disk/by-uuid/$DISK_UUID $MOUNT_DIR
			check_dir
			exit 0;
			;;
		-u|--umount)
			echo "[Attempting to un-mount iSCSI volume]"
			umount $MOUNT_DIR
			iscsiadm --mode node --targetname $IQN --portal $PORTAL_IP --logout
			check_dir
			exit 0;
			;;
		-s|--status)
			echo "[Showing status of mount-point]"
			check_dir
			exit 0;
			;;
		-*)
			show_usage
			;; 
		esac
	done

# Show usage if no parameters have been passed
if [[ $# -eq 0 ]]
then
	show_usage
fi