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#!/bin/bash
if [ -z "$1" ]; then
echo "$0: <image> <binary> [<initrdpath>]"
exit 1
fi
if [ ! -f $1 ]; then
echo "$1 doesn't exist"
exit 1
fi
MNTPOINT=/tmp/updboottree.$$
INITRD=/tmp/updboottree.$$.initrd
LOOPMNT=/tmp/updboottree.$$.initrdmnt
rm -rf $MNTPOINT $LOOPMNT
mkdir $MNTPOINT $LOOPMNT
mount -t vfat -o loop $1 $MNTPOINT
gunzip < $MNTPOINT/initrd.img > $INITRD
mount -o loop $INITRD $LOOPMNT
FROM=$2
TO=$FROM
if [ $(echo $FROM | cut -d- -f1) = loader ]; then
TO=loader
fi
if [ ! -x $LOOPMNT/sbin/$TO ]; then
echo "$LOOPMNT/sbin/$TO doesn't exist"
else
cp $FROM $FROM.foo
strip $FROM.foo
install $FROM.foo $LOOPMNT/sbin/$TO
rm -f $FROM.foo
fi
umount $LOOPMNT
gzip -9 < $INITRD > $INITRD.new
cp $INITRD.new $MNTPOINT/initrd.img
umount $MNTPOINT
if [ -n "$3" -a -f "$3" ]; then
echo "Replacing $3"
cp -f $INITRD.new $3
fi
rm -rf $MNTPOINT $LOOPMNT $INITRD $INITRD.new
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