#!/bin/sh
# $Id$
if [ $(id -u) -ne 0 ];then
	printf "Installation is only possible as root\n"
	exit 1
fi

printf "Checking if grub is installed"
grub=$(which grub)

if [ ! -z $grub -a -x $grub ];then
	printf "...okay\n"
else
	printf "...failed\n"
	exit 1
fi

printf "Checking if sfdisk is installed"
sfdisk=$(which sfdisk)

if [ ! -z $sfdisk -a -x $sfdisk ];then
	printf "...okay\n"
else
	printf "...failed\n"
	exit 1
fi

printf "Checking if parted is installed"
parted=$(which parted)

if [ ! -z $parted -a -x $parted ];then
	printf "...okay\n"
else
	printf "...failed\n"
	exit 1
fi

printf "Checking if mke2fs is installed"
mke2fs=$(which mke2fs)

if [ ! -z $mke2fs -a -x $mke2fs ];then
	printf "...okay\n"
else
	printf "...failed\n"
	exit 1
fi

printf "Checking if tune2fs is installed"
tune2fs=$(which tune2fs)

if [ ! -z $tune2fs -a -x $tune2fs ];then
	printf "...okay\n"
else
	printf "...failed\n"
	exit 1
fi

cfgfs=1
while getopts "n" option
do
	case $option in
		n)
		cfgfs=0
		;;
		*)
		printf "Option not recognized\n"
		exit 1
		;;
	esac
done
shift $(($OPTIND - 1))


if [ -z $1 ];then
	printf "Please give your compact flash or USB device as first parameter\n"
	exit 1
else
	if [ -z $2 ];then
		printf "Please give your install tar as second parameter\n"
		exit 2
	fi
	if [ -f $2 ];then
		printf "Installing $2 on $1\n"
	else
		printf "$2 is not a file, Exiting\n"
		exit 1
	fi
	if [ -b $1 ];then
		printf "Using $1 as CF/USB disk for installation\n"
		printf "This will destroy all data on $1, are you sure?\n"
		printf "Type "y" to continue\n"
		read y
		if [ $y = "y" ];then
			$sfdisk -l $1 2>&1 |grep 'No medium'
			if [ $? -eq 0 ];then
				exit 1
			else
				printf "Starting with installation\n"
			fi
		else
			printf "Exiting.\n"
			exit 1
		fi
	else
		printf "Sorry $1 is not a block device\n"
		exit 1
	fi
fi
	

if [ $(mount | grep $1| wc -l) -ne 0 ];then
	printf "Block device $1 is in use, please umount first.\n"
	exit 1
fi


if [ $($sfdisk -l $1 2>/dev/null|grep Empty|wc -l) -ne 4 ];then
	printf "Partitions already exist, should I wipe them?\n"
	printf "Type y to continue\n"
	read y
	if [ $y = "y" ];then
		printf "Wiping existing partitions\n"
		dd if=/dev/zero of=$1 bs=512 count=1
	else
		printf "Exiting.\n"
		exit 1
	fi
fi

printf "Create partition and filesystem\n"
if [ $cfgfs -eq 0 ];then
$sfdisk $1 << EOF
,,L
;
;
;
y
EOF

$mke2fs ${1}1

else
$parted -s $1 mklabel msdos
sleep 2
declare -i maxsize
maxsize=$(parted $1 -s unit cyl print |awk '/^Disk/ { print $3 }'|sed -e 's/cyl//')
let rootsize=$maxsize-1

$parted -s $1 unit cyl mkpartfs primary ext2 0 $rootsize
$parted -s $1 unit cyl mkpart primary fat32 $rootsize $maxsize
$parted -s $1 set 1 boot on
$sfdisk --change-id $1 2 88
fi

if [ $? -eq 0 ];then
	printf "Successfully created partition ${1}1\n"
else
	printf "Partition creation failed, Exiting.\n"
	exit 1
fi

sleep 4
$tune2fs -c 0 -i 0 ${1}1 >/dev/null

if [ $? -eq 0 ];then
	printf "Successfully disabled filesystem checks on ${1}1\n"
else	
	printf "Disabling filesystem checks failed, Exiting.\n"
fi	

tmp=$(mktemp -d)
mount -t ext2 ${1}1 $tmp
printf "Extracting install archive\n"
tar -C $tmp -xzpf $2 
printf "Fixing permissions\n"
chmod 1777 $tmp/tmp
chmod 4755 $tmp/bin/busybox

printf "Copying grub files\n"
mkdir $tmp/boot/grub
cp /boot/grub/stage1 $tmp/boot/grub
cp /boot/grub/stage2 $tmp/boot/grub
cp /boot/grub/e2fs_stage1_5 $tmp/boot/grub

cat << EOF > $tmp/boot/grub/menu.lst
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=2 serial console
timeout 2
default 0
hiddenmenu
title linux
root (hd0,0)
kernel /boot/kernel root=/dev/sda1 init=/init console=ttyS0,115200 console=tty0 panic=10 rw
EOF

printf "Installing Grub bootloader\n"
$grub --batch --no-curses --no-floppy --device-map=/dev/null >/dev/null << EOF
device (hd0) $1
root (hd0,0)
setup (hd0)
quit
EOF

printf "Creating device nodes\n"
mknod -m 666 $tmp/dev/null c 1 3
mknod -m 622 $tmp/dev/console c 5 1
mknod -m 666 $tmp/dev/tty c 5 0

umount $tmp

printf "Successfully installed.\n"
exit 0
