mount_rootfs - Stripping a puppy

#!/bin/sh
curdir=`pwd`
rootfs="root_fs"
xinteractive =1
unmount_vfs(){
 umount -l $curdir/$rootfs/dev 2>/dev/null
 umount -l $curdir/$rootfs/sys 2>/dev/null
 umount -l $curdir/$rootfs/proc 2>/dev/null
 #umount /mnt/wktaz 2>/dev/null
 #umount /mnt/wksfs 2>/dev/null
}

trap unmount_vfs EXIT
trap unmount_vfs SIGKILL
trap unmount_vfs SIGTERM
xinteractive=1
echo "PUPMODE='2'" > $curdir/$rootfs$prefix/etc/rc.d/PUPSTATE
mkdir -p $curdir/$rootfs/proc;
mkdir -p $curdir/$rootfs/sys

mount -o rbind /proc $curdir/$rootfs/proc
mount -t sysfs none $curdir/$rootfs/sys
if [ $xinteractive -eq 1 ]; then
 echo "Removing block device files..."
 #rm -rf $curdir/$rootfs/dev/*
 #mount bind -t devtmpfs none $curdir/$rootfs/dev
 mount -o rbind /dev $curdir/$rootfs/dev
 cp -f /etc/resolv.conf $curdir/$rootfs/etc/resolv.conf
fi

chroot $curdir/$rootfs /bin/ash


if [ "$(mount | grep "$curdir/$rootfs/dev")" != "" ]; then
 umount -l $curdir/$rootfs/dev
fi

if [ "$(mount | grep "$curdir/$rootfs/sys")" != "" ]; then
 umount -l $curdir/$rootfs/sys
fi
if [ "$(mount | grep "$curdir$rootfs/proc")" != "" ]; then
 umount -l $curdir/$rootfs/proc
fi