#!/bin/sh
#
# Copies the contents out of a romfs image into an ext3-image
# and sets up a lilo boot sector on it.
# Need to be root to do this.
#
# Usage: make-ext3-image CYLS HEADS SECTORS CONFIG

CYLS="$1"
HEADS="$2"
SECTORS="$3"
CONFIG="$4"

count=`expr $CYLS \\* $HEADS \\* $SECTORS - $CONFIG - 1`

# First make an MBR with the appropriate partition table
dd if=/dev/zero of=mbr.img bs=512 count=1
echo -e "1,$count,L,*\n,,61,-" | /sbin/sfdisk -uS -C $CYLS -H $HEADS -S $SECTORS mbr.img

# Create an empty ext3 image
dd if=/dev/zero of=ext3.img bs=512 count=$count
/sbin/mke2fs -F -m0 -v ext3.img
/sbin/tune2fs -i 0 -j ext3.img

rm -rf romfs.mnt ext3.mnt
mkdir romfs.mnt ext3.mnt

trap "umount romfs.mnt; umount ext3.mnt; sleep 1"

# Now mount it and copy in the contents of the romfs image
mount -t romfs -o loop romfs.img romfs.mnt
mount -t ext2 -o loop ext3.img ext3.mnt
( cd romfs.mnt; find . -print | cpio -pdum ../ext3.mnt )

chmod -R go-w ext3.mnt
chgrp -hR root ext3.mnt
chown -hR root ext3.mnt

# And finally write the lilo boot sector
DEV=`mount | grep ext3.img | sed 's?.*loop=/dev/loop\([0-9]\).*$?\1?'`

echo "#Device Bios    Sectors Heads   Cyls    Start" > disktab
echo "0x70$DEV	0x80	$SECTORS	$HEADS	$CYLS 1" >> disktab

./lilo -s /dev/null -C build.lilo.conf -f disktab

umount romfs.mnt
umount ext3.mnt
sleep 1

rm -rf romfs.mnt ext3.mnt
rm -f disktab lilo.conf