#!/bin/bash

GOOD=$'\e[32;01m'
NORMAL=$'\e[0m'
BAD=$'\e[31;01m'

CURRENT_SYS=`uname -m`

[ "${CURRENT_SYS}" = "i686" ] && TARGET_SYS="x86_64"
[ "${CURRENT_SYS}" = "x86_64" ] && TARGET_SYS="i686"

[ "${TARGET_SYS}" = "i686" ] && LINUX="linux32"
[ "${TARGET_SYS}" = "x86_64" ] && LINUX="linux64"

if [ ! `which ${LINUX} > /dev/null 2>&1` ] 
then
	echo " ${BAD}*${NORMAL} Error : cannot find the ${LINUX} executable"
	exit 1
fi

echo -e " ${GOOD}*${NORMAL} Current system is : ${CURRENT_SYS}"
echo -e " ${GOOD}*${NORMAL} Target system is  : ${TARGET_SYS}"

#mkdir -p /emul/${TARGET_SYS}/emul/${CURRENT_SYS}

mount -o bind / /emul/${TARGET_SYS}/emul/${CURRENT_SYS}
mount -o bind /home /emul/${TARGET_SYS}/home
mount -o bind /root /emul/${TARGET_SYS}/root
mount -o bind /usr/portage /emul/${TARGET_SYS}/usr/portage

# Files that do not need to be duplicated are symlinked
for ETCFILE in resolv.conf passwd shadow shadow- group hosts mtab;
do
	echo "   >>> /etc/${ETCFILE} copied to /emul/${TARGET_SYS}/etc/${ETCFILE}"
	cp -f /etc/${ETCFILE} /emul/${TARGET_SYS}/etc/${ETCFILE}
done

echo -e " ${GOOD}*${NORMAL} Chroot-ing to /emul/${TARGET_SYS}"
${LINUX} chroot /emul/${TARGET_SYS} /bin/bash -l

# Unmounting stuff
umount /emul/${TARGET_SYS}/emul/${CURRENT_SYS}
umount /emul/${TARGET_SYS}/home
umount /emul/${TARGET_SYS}/root
umount /emul/${TARGET_SYS}/usr/portage