#!/bin/sh -e

DVHTOOL=/usr/sbin/dvhtool
ARCBOOT_IMG=/usr/lib/arcboot/arcboot.ip22
ARCBOOT_CONF=/etc/arcboot.conf

# system type		: RM200-C40
SYSTYPE=`sed -ne '/^system type/ { s/.*: //; p; }' </proc/cpuinfo`

case "$SYSTYPE" in
	SGI\ IP32*|SGI\ O2*)
		ARCBOOT_IMG=/usr/lib/arcboot/arcboot.ip32
		VHNAME=arcboot
		;;
	RM*)
		# We make it aboot as the SNI RM environment in the prom is 
		# limited to very little chars so we need to make it shorter
		ARCBOOT_IMG=/usr/lib/arcboot/arcboot.snirm
		VHNAME=aboot
		;;
	*)
		ARCBOOT_IMG=/usr/lib/arcboot/arcboot.ip22
		VHNAME=arcboot
esac

if [ ! -r $ARCBOOT_CONF ]; then
	echo "No $ARCBOOT_CONF - giving up!"
	exit 1
fi

if [ ! -x $DVHTOOL ]; then
	echo "Can't find dvhtool - giving up!"
	exit 1
fi

if [ -z "$1" ]; then
	echo "Usage: arcboot <name_of_disk>"
	exit 1
fi

echo -n "Putting `basename $ARCBOOT_IMG` into the volume header of $1 as $VHNAME ..."
$DVHTOOL -d $1 --unix-to-vh $ARCBOOT_IMG $VHNAME
echo "done."

# check if the "image=" lines in $ARCBOOT_IMG refer to valid ELF images
for i in `grep "^[[:space:]]*image="  $ARCBOOT_CONF`; do
 	IMAGE=`echo $i | cut -d'=' -f2`;
	if [ -L $IMAGE ]; then	# if it's a symlink, follow it
		IMAGE=`dirname $IMAGE`/`readlink $IMAGE`
	fi
	if [ "$(dd if=$IMAGE bs=4 count=1 2>/dev/null)" != "$(printf '\177ELF')" ]; then
		echo "Warning: $IMAGE is not an ELF image. Booting it will fail!"
	fi
done

# TODO: better sanity checking of $ARCBOOT_CONF