#!/bin/sh
# Updates an installer initrd with a new loader and init binary 
# Usage: upd-initrd <initrd>
#
# Jeremy Katz <katzj@redhat.com>
# Copyright 2005   Red Hat, Inc.
# Modified 21-Feb-2006 by David Cantrell <dcantrell@redhat.com>

if [ $# -ne 1 ]; then
    echo "Usage: $0 <initrd>"
    exit 1
fi

CWD=$(pwd)

INITRD=$(readlink -f $1)
TMPINITRD=initrd.img-$$

tmpdir=$(mktemp -d)
pushd $tmpdir
gzip -dc $INITRD |cpio -id

ismainframe=no
if [ -f $CWD/loader ]; then
    if [ ! -z "$(file $CWD/loader | grep "S/390")" ]; then
        ismainframe=yes
    fi
fi

if [ -f $CWD/loader ]; then
    strip -s -o sbin/loader $CWD/loader
fi

if [ "$ismainframe" = "yes" ]; then
    if [ -f $CWD/linuxrc.s390 ]; then
        cat $CWD/linuxrc.s390 > sbin/init
    fi
else
    if [ -f $CWD/init ]; then
        strip -s -o sbin/init $CWD/init
    fi
fi

(sudo find . |cpio -c -o |gzip -9) > $CWD/$TMPINITRD
mv $CWD/$TMPINITRD $INITRD
popd
rm -rf $tmpdir