#!/bin/bash

# mkbootdisk
#
# Written by Erik Troan <ewt@redhat.com>

pause=yes
unset kernel
device=/dev/fd0
unset verbose
unset witheth
unset withdoc
unset mkinitrdargs

MOUNTDIR=/tmp/mkbootdisk
PATH=/sbin:$PATH
export PATH

VERSION=1.2

usage () {
    cat >&2 <<EOF
usage: `basename $0` [--version] [--noprompt] [--mkinitrdargs <args>] 
       [--device <devicefile>] [--verbose -v] <kernel>
       (ex: `basename $0` --device /dev/fd1 2.0.31)
EOF
    exit $1
}

while [ $# -gt 0 ]; do
    case $1 in
	--device)
	    shift
	    device=$1
	    ;;
	--mkinitrdargs)
	    shift
	    mkinitrdargs=$1
	    ;;
	--help)
	    usage 0
	    ;;
	--noprompt)
	    unset pause
	    ;;
	-v)
	    verbose=true
	    ;;
	--verbose)
	    verbose=true
	    ;;
	--version)
	    echo "mkbootdisk: version $VERSION"
	    exit 0
	    ;;
	*)
	    if [ -z "$kernel" ]; then
		kernel=$1
	    else
		usage
	    fi
	    ;;
    esac

    shift
done

[ -z "$kernel" ] && usage 1

[ -d /lib/modules/$kernel ] || {
    echo "/lib/modules/$kernel is not a directory." >&2
    exit 1
}

[ -f /boot/vmlinuz-$kernel ] || {
    echo "/boot/vmlinuz-$kernel does not exist." >&2
    exit 1
}

[ -f /etc/conf.modules -a -f /lib/modules/$kernel/modules.dep ] && {
    ethmodule=`sort -u /etc/conf.modules | awk '/^alias eth0/ { print $3 }'`
    [ $n "$ethmodule" ] && {
	if echo $ethmodule | grep '\.o$'; then
	    ethmodule=`echo ${ethmodule} | sed "s/\.o$//"`
	fi
	deps=`grep "/net/$ethmodule.o" /lib/modules/$kernel/modules.dep | head -1`
	deps=`echo $deps | cut -d: -f2`
	for n in $deps; do
	    mod=`basename $n | cut -d. -f1`
	    witheth="$witheth --with $mod"
	done
	witheth="$witheth --with $ethmodule"
    }
}

[ -f /lib/modules/$kernel/block/doc.o ] &&
	withdoc="--preload doc"

[ -f /lib/modules/$kernel/fs/isofs.o ] &&
	withfs="$withfs --with isofs"
[ -f /lib/modules/$kernel/fs/nfs.o ] &&
	withfs="$withfs --with nfs"
[ -f /lib/modules/$kernel/fs/fat.o ] &&
	withfs="$withfs --with fat"
[ -f /lib/modules/$kernel/fs/msdos.o ] &&
	withfs="$withfs --with msdos"

rootdev=`awk '$1 ~ /^[^#]/ && $2 ~ /^\/$/ { print $1 ; exit }' /etc/fstab`
[ -z $rootdev ] && {
    echo 'Cannot find root partition in /etc/fstab.' >&2
    exit 1
}

[ -n "$pause" ] && {
    echo "Insert a disk in $device. Any information on the disk will be lost."
    echo -n "Press <Enter> to continue or ^C to abort: "
    read aline
}

[ -n "$verbose" ] && echo -n "Formatting $device... "
mke2fs $device > /dev/null 2>/dev/null
[ -n "$verbose" ] && echo "done."

rm -rf $MOUNTDIR
mkdir $MOUNTDIR || {
    echo "Failed to create $MOUNTDIR" >&2
    exit 1
}
[ -d $MOUNTDIR ] || {
    echo "$MOUNTDIR is not a directory!" >&2
    exit 1
}

mount -t ext2 $device $MOUNTDIR || {
    rmdir $MOUNTDIR
    exit 1
}

[ -n "$verbose" ] && echo -n "Copying /boot/vmlinuz-$kernel... "
cp -a /boot/vmlinuz-$kernel $MOUNTDIR
[ -n "$verbose" ] && echo "done."

[ -n "$verbose" ] && echo -n "Creating initrd image... "
/sbin/mkinitrd $mkinitrdargs $withdoc $witheth --ifneeded $MOUNTDIR/initrd.img $kernel
[ -n "$verbose" ] && echo "done."

[ -n "$verbose" ] && echo -n "Setting up lilo... "
mkdir $MOUNTDIR/etc
mkdir $MOUNTDIR/dev
mkdir $MOUNTDIR/boot
cp -Pa $device $MOUNTDIR
cp -Pa $rootdev $MOUNTDIR
cp -a /boot/doc.b $MOUNTDIR/boot/boot.b

cat > $MOUNTDIR/etc/lilo.conf <<EOF
boot=$device
timeout=100
message=/boot/message
prompt
image=/vmlinuz-$kernel
	label=linux
	root=$rootdev
EOF
[ -f $MOUNTDIR/initrd.img ] && echo "	initrd=/initrd.img" >> $MOUNTDIR/etc/lilo.conf

chmod 644 $MOUNTDIR/etc/lilo.conf

cat >> $MOUNTDIR/boot/message <<EOF
Press <return> (or wait 10 seconds) to boot your Red Hat Linux system from
$rootdev. You may override the default linux kernel parameters by typing
"linux <params>", followed by <return> if you like.

EOF

[ -n "$verbose" ] && echo "done."

if [ -n "$verbose" ]; then
    /sbin/doc-lilo -r $MOUNTDIR
else
    /sbin/doc-lilo -r $MOUNTDIR > /dev/null
fi

umount $MOUNTDIR
rmdir $MOUNTDIR
