#!/bin/bash
	
if [ "$UID" != "0" ]; then
	echo "chroot need root access!"
	exit 1
fi

LFS=$1

if [ -z $1 ]; then
	echo "Please set mount point for chroot!"
	exit 1
fi

if [ ! -d $LFS ]; then
	echo "Dir $LFS not exist"
	exit 1
fi

pushd $LFS

mount -v --bind /dev $LFS/dev
mount -vt devpts devpts $LFS/dev/pts -o gid=5,mode=620
mount -vt proc proc $LFS/proc
mount -vt sysfs sysfs $LFS/sys
mount -vt tmpfs tmpfs $LFS/run

if [ -h $LFS/dev/shm ]; then
  mkdir -pv $LFS/$(readlink $LFS/dev/shm)
fi

if [ -d $LFS/tools ]; then
	chroot "$LFS" /tools/bin/env -i HOME=/root TERM="$TERM" PS1='\u:\w\$ ' PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin /tools/bin/bash --login +h
else
	chroot "$LFS" /usr/bin/env -i HOME=/root TERM="$TERM" PS1='\u:\w\$ ' PATH=/bin:/usr/bin:/sbin:/usr/sbin /bin/bash --login
fi

popd
echo chroot exited

echo "Unmounting virtual filesystem"
umount -v $LFS/dev/pts
umount -v $LFS/dev
umount -v $LFS/run
umount -v $LFS/proc
umount -v $LFS/sys