#!/bin/bash
#
# Invoked upon installation or removal of a kernel package, the following
# tasks are/can be done here:
# creation/removal of initrd
# run of depmod/removal of depmod generated files
# addition/removal of kernel images from grub/lilo configuration (via grubby)
#
# Copyright (C) 2002, 2003 Red Hat, Inc.
# 

PATH=/sbin:/bin:$PATH

lilo=/sbin/lilo

# some defaults that are sane for most arches
kernelName=elf-memtest86+

if [ -x ./grubby ]; then
    grubby=./grubby
else
    grubby=/sbin/grubby
fi

cfgGrub=""
cfgLilo=""
runLilo=""
grubConfig=""

ARCH=$(uname -m)

if [ $ARCH = 'ia64' ]; then
    liloConfig=/boot/efi/EFI/redhat/elilo.conf
    bootPrefix=/boot/efi/EFI/redhat
    liloFlag=elilo
    isx86=""
elif [ $ARCH = 'ppc64' -o $ARCH = 'ppc' ]; then
    liloConfig=/etc/yaboot.conf
    bootPrefix=/boot
    lilo=/sbin/ybin
    kernelName=vmlinux
    liloFlag=yaboot
    runLilo="yes"
    isx86=""
elif [ $ARCH = 'sparc' -o $ARCH = 'sparc64' ]; then
    liloConfig=/etc/silo.conf
    bootPrefix=/boot
    liloFlag=silo
    lilo=/sbin/silo
    isx86=""
elif [ $ARCH = 's390' -o $ARCH = 's390x' ]; then
    liloConfig=/etc/zipl.conf
    bootPrefix=/boot
    liloFlag=zipl
    lilo=/sbin/zipl
    runLilo="yes"
    isx86=""
else
    # this leaves i?86 and x86_64
    liloConfig=/etc/lilo.conf
    grubConfig=/boot/grub/grub.conf
    bootPrefix=/boot
    liloFlag=lilo
    isx86="yes"
fi

mode=""
version=""
initrd=""
initrdfile=""
moddep=""
verbose=""

usage() {
    echo "Usage: `basename $0` [-v] [--mkinitrd] [--rminitrd]" >&2 
    echo "       [--initrdfile=<initrd-image>] [--depmod] [--rmmoddep]" >&2
    echo "       [--kernel-args=<args>] [--banner=<banner>]" >&2
    echo "       <--install | --remove> <kernel-version>" >&2
    echo "       (ex: `basename $0` --mkinitrd --depmod --install 2.4.7-2)" >&2
    exit 1
}

install() {
    # XXX kernel should be able to be specified also (or work right on ia64)
    if [ ! -f $bootPrefix/$kernelName-$version ] ; then
	[ -n "$verbose" ] && echo "kernel for $version does not exist, not running grubby"
	return
    fi
    
    INITRD=""
    if [ -f $initrdfile ]; then
	[ -n "$verbose" ] && echo "found $initrdfile and using it with grubby"
	INITRD="--initrd $initrdfile"
    fi

    # FIXME: is this a good heuristic to find out if we're on iSeries?
    if [ -d /proc/iSeries ]; then
	[ -n "$verbose" ] && echo "On an iSeries, just making img file"
	if [ -z $initrdfile  ]; then
	    [ -n "$verbose" ] && echo "No initrd, just adding system map"
	    /sbin/addSystemMap $bootPrefix/System.map-$version $bootPrefix/$kernelName-$version $bootPrefix/vmlinitrd-$version
	else
	    /sbin/addSystemMap $bootPrefix/System.map-$version $bootPrefix/$kernelName-$version $bootPrefix/vmlinux.sm-$version
	    /sbin/addRamDisk $initrdfile $bootPrefix/System.map-$version $bootPrefix/vmlinux.sm-$version $bootPrefix/vmlinitrd-$version 2>/dev/null
	    rm $bootPrefix/vmlinux.sm-$version
	fi
	return
    fi

    # get the root filesystem to use; if it's on a label/uuid make sure it's
    # been configured. if not, get the root device from mount
    rootdevice=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $1; }}' /etc/fstab)
    short=$(echo $rootdevice | cut -d= -f1)
    if [ "$short" == "LABEL" -o "$short" == "UUID" ]; then
	if ! /sbin/findfs "$rootdevice" &> /dev/null; then
	    rootdevice=$(mount | awk '$3 == "/" { print $1 }')
	fi
    fi

    if [ -n "$cfgGrub" ]; then
	[ -n "$verbose" ] && echo "adding $version to $grubConfig"

	if [ -n "$banner" ]; then
            title="$banner ($version)"
	elif [ -f /etc/redhat-release ]; then
	    title="$(sed 's/ release.*$//' < /etc/redhat-release) ($version)"
	else
	    title="Red Hat Linux ($version)"
	fi
	/sbin/grubby --add-kernel=$bootPrefix/$kernelName-$version $INITRD    \
		     --copy-default --title "$title"		    \
		     --args="root=$rootdevice $kernargs"			    \
		     --remove-kernel="TITLE=$title"
    else
	[ -n "$verbose" ] && echo "$grubConfig does not exist, not running grubby"
    fi

    if [ -n "$cfgLilo" ]; then
	[ -n "$verbose" ] && echo "adding $version to $liloConfig"

	/sbin/grubby --add-kernel=$bootPrefix/$kernelName-$version $INITRD    \
		     --copy-default --title $version		    \
		     --args="root=$rootdevice $kernargs"			    \
		     --remove-kernel="TITLE=$version"		    \
		     --$liloFlag

	if [ -n "$runLilo" ]; then 
	    [ -n "$verbose" ] && echo "running $lilo"
	    if [ ! -x $lilo ] ; then
		[ -n "$verbose" ] && echo "$lilo does not exist"
	    else
		$lilo > /dev/null
	    fi
	fi
    else
	[ -n "$verbose" ] && echo "$liloConfig does not exist, not running grubby"
    fi

}

remove() {
    # FIXME: is this a good heuristic to find out if we're on iSeries?
    if [ -d /proc/iSeries ]; then
	[ -n "$verbose" ] && echo "On an iSeries, remove img file"
	rm -f $bootPrefix/$kernelName-$version.img 2>/dev/null
	return
    fi

    if [ -n "$cfgGrub" ]; then
	[ -n "$verbose" ] && echo "removing $version from $grubConfig"
	/sbin/grubby --remove-kernel=$bootPrefix/$kernelName-$version
    else
	[ -n "$verbose" ] && echo "$grubConfig does not exist, not running grubby"
    fi

    if [ -n "$cfgLilo" ]; then
	[ -n "$verbose" ] && echo "removing $version from $liloConfig"
	/sbin/grubby --remove-kernel=$bootPrefix/$kernelName-$version	    \
		     --$liloFlag

	if [ -n "$runLilo" ]; then 
	    [ -n "$verbose" ] && echo "running $lilo"
	    if [ ! -x $lilo ] ; then
		[ -n "$verbose" ] && echo "$lilo does not exist"
	    else
		$lilo > /dev/null
	    fi
	fi
    else
	[ -n "$verbose" ] && echo "$liloConfig does not exist, not running grubby"
    fi
}

mkinitrd() {
    [ -n "$verbose" ] && echo "creating initrd $initrdfile using $version"
    /sbin/mkinitrd -f $initrdfile $version
    rc=$?
    if [ $rc != 0 ]; then
	echo "mkinitrd failed" >&2
	exit 1
    fi
}

rminitrd() {
    [ -n "$verbose" ] && echo "removing initrd $initrdfile"
    [ -f $initrdfile ] && rm -f $initrdfile
}

doDepmod() {
    [ -n "$verbose" ] && echo "running depmod for $version"
    depmod -ae -F /boot/System.map-$version $version
}

doRmmoddep() {
    [ -n "$verbose" ] && echo "removing modules.dep info for $version"
    [ -d /lib/modules/$version ] && rm -f /lib/modules/$version/modules.*    
}


while [ $# -gt 0 ]; do
    case $1 in
	--mkinitrd)
	    initrd="make"
	    ;;

	--rminitrd)
	    initrd="remove"
	    ;;

	--initrdfile*)
	    if echo $1 | grep '=' >/dev/null ; then
	    	initrdfile=`echo $1 | sed 's/^--initrdfile=//'`
	    else
		initrdfile=$2
		shift
	    fi		    
	    ;;

	--kernel-args*)
	    if echo $1 | grep '=' >/dev/null ; then
	    	kernargs=`echo $1 | sed 's/^--kernel-args=//'`
	    else
		kernargs=$2
		shift
	    fi		    
	    ;;

	--banner*)
	    if echo $1 | grep '=' >/dev/null ; then
	    	banner=`echo $1 | sed 's/^--banner=//'`
	    else
		banner=$2
		shift
	    fi		    
	    ;;

	--depmod)
	    moddep="make"
	    ;;

	--rmmoddep)
	    moddep="remove"
	    ;;

	-v)
	    verbose=-v
	    ;;

	*)
	    if [ -z "$mode" ]; then
		mode=$1
	    elif [ -z "$version" ]; then
		version=$1
	    else
		usage
	    fi
	    ;;
    esac

    shift
done

# make sure the mode is valid
if [ "$mode" != "--install" -a "$mode" != "--remove" ] ; then
    usage
fi

if [ -z "$version" ]; then
    usage
fi

# set the initrd file based on arch; ia64 is the only currently known oddball
if [ -z "$initrdfile" ]; then
    if [ `uname -m` = "ia64" ]; then
	initrdfile="/boot/efi/EFI/redhat/initrd-$version.img"
    else
	initrdfile="/boot/initrd-$version.img"
    fi

fi
[ -n "$verbose" ] && echo "initrdfile is $initrdfile"

if [ "$moddep" == "make" ]; then
    doDepmod
elif [ "$moddep" == "remove" ]; then
    doRmmoddep
fi

if [ "$initrd" == "make" ]; then
    mkinitrd
elif [ "$initrd" == "remove" ]; then
    rminitrd
fi

if [ ! -x $grubby ] ; then
    [ -n "$verbose" ] && echo "$grubby does not exist"
    exit 0
fi


[ -n "$grubConfig" ] && [ -f "$grubConfig" ] && cfgGrub=1;
[ -n "$liloConfig" ] && [ -f "$liloConfig" ] && cfgLilo=1;

# if we have a lilo config on an x86 box, see if the default boot loader
# is lilo to determine if it should be run
if [ -n "$cfgLilo" -a -n "$isx86" ]; then
    runLilo=$($grubby --bootloader-probe | grep lilo)
fi

if [ "$mode" == "--install" ]; then
    install
elif [ "$mode" == "--remove" ]; then
    remove
fi

exit 0