#!/bin/bash
#these are symbols that will be in /proc/ksyms, if a module is loaded
#or compiled in the kernel
cat << ENDBEG
                           BACKPACK LINUX DIAGNOSIS PROGRAM

	This program will attempt to see if your backpack drive is
	functioning correctly.  When this program is done you will want
	to find out how to use cdrecord and mount.

ENDBEG

PARPORT="parport_register_driver"
PARPORT_PC="parport_pc_probe_port"
PARIDE="pi_init"
BPCK6="bpck6_connect"
BPCK5="bpck_connect"
PG="pg_init"
PCD="pcd_init"
CDROM="register_cdrom"

#these are the respective modules to be loaded for each subsystem
PARPORT_MOD="parport"
PARPORT_PC_MOD="parport_pc"
PARIDE_MOD="paride"
BPCK6_MOD="bpck6"
PG_MOD="pg"
PCD_MOD="pcd"
CDROM_MOD="cdrom"

LOAD_MODULES=""

# GET DISTRIBUTION -----------------------------------------------------
PLATFORM="unknown"

if [ -e /etc/redhat-release ]
then
	PLATFORM="redhat"
elif [ -e /etc/debian ] 
then
	PLATFORM="debian"
fi

echo "Platform is $PLATFORM"

# GET KERNEL VERSION -----------------------------------------------------

KERNVER="unknown"

if which uname >/dev/null
then
	KERNVER=`uname -r`
fi

echo "Kernel version is $KERNVER"

#Check if root

if [ "$UID" != "0" ]
then
	echo "This script needs to be run as root"
	exit 1	
fi


# FIND LSMOD -----------------------------------------------------
#try finding lsmod in path otherwise try in /sbin, fail out if not found

LSMODPATH=`which lsmod >/dev/null 2>/dev/null`
if LSMODPATH=""
then
	if [ -x /sbin/lsmod ]
	then
		LSMODPATH="/sbin/lsmod"
	else
		echo "Cannot locate lsmod!"
		echo "have you installed modutils?"
		exit 1
	fi
fi


# TEST FOR MODULES INSTALLED------------------------------------------
#for each module of the kernel check to see if it is compiled in
#this requires the proc filesystem

for i in PARPORT PARPORT_PC PARIDE BPCK6 BPCK PG CDROM PCD
do
	MODNAME="${i}_MOD"
	if $LSMODPATH |grep "^${!MODNAME}" >/dev/null
	then
		echo "$i is already loaded as a module"
	elif grep "${!i}" /proc/ksyms >/dev/null
	then
		echo "$i is already compiled in the kernel"
	else
		LOAD_MODULES="$LOAD_MODULES ${i}_MOD"
	fi
done	

# FIND INSMOD -----------------------------------------------------
#try finding insmod in path otherwise try in /sbin, fail out if not found

INSMODPATH=`which insmod >/dev/null 2>/dev/null`
if INSMODPATH=""
then
	if [ -x /sbin/insmod ]
	then
		INSMODPATH="/sbin/insmod"
	else
		echo "Cannot locate insmod!"
		echo "have you installed modutils?"
		exit 1
	fi
fi

# LOAD MISSING MODULES -----------------------------------------------

FAILED_FLAG="n"
PG_MOD_FAILED="n"
PCD_MOD_FAILED="n"
for i in $LOAD_MODULES
do
	echo -n "Attempting to load ${!i}: "
	if $INSMODPATH ${!i} >/dev/null 2>/dev/null
	then 
		echo Success
	else
		echo Failed
		if [ "$i" == "PG_MOD" ]
		then
			echo "	Is the drive connected to the parallel port?"
			PG_MOD_FAILED="y"
		elif [ "$i" == "PCD_MOD" ]
		then
			echo "	Is the drive connected to the parallel port?"
			PCD_MOD_FAILED="y"			
		elif [ "$i" == "BPCK6_MOD ]
		then
			echo "We will be unable to work with series 6 backpacks"
		elif [ "$i" == "BPCK_MOD ]
		then
			echo "We will be unable to work with series 5 backpacks"
		else
			FAILED_FLAG="y"
		fi
	fi
done

if [ "FAILED_FLAG" == "y" ]
then 
	echo "Machine is incorrectly configured for parallel port drive usage"
	exit 1
elif [ "$PG_MOD_FAILED" = "y" ] && [ "$PCD_MOD_FAILED" == "y" ] 
then
	echo "Kernel modules are configured, but backpack drive could not be detected"
	exit 1
else
	echo "Kernel modules are configured and backpack is detected"
fi