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#!/bin/sh
help()
{
echo " The scope of this script is to setup an environment for 32b legacy applications."
echo " This is a replacement for MULTILIB mechanism which is not available yet for aarch64."
echo " chroot is used to setup an isolated environment for 32b applications"
echo " "
echo " Prerequisites:"
echo " - user must build a 32b amrv7 rootfs (e.q. build a image for qemuarm)"
echo " - user must copy 32b armv7 rootfs under 64b rootfs (e.q. /mnt/rootfs32)"
echo " - user must copy 32b application under 32b rootfs (e.q. /mnt/rootfs32/myapp)"
echo ""
echo " Run setup script to prepare the environment for 32b applications"
echo " > set_32b_env_chroot -r /mnt/rootfs32"
echo ""
echo " Run 32b applications"
echo " @> ./myapp/myexec"
echo ""
echo " In order to return to default root just type <exit>"
echo " @> exit"
exit
}
usage()
{
echo "set_32b_env_chroot OPTIONS"
echo "OPTIONS:"
echo ""
echo " -r <32b_rootfs> : path to a 32b rootfs."
echo " -h : display help"
echo ""
exit
}
if [[ $# -eq 0 ]] ; then
echo "[ERR]: Missing script parameters!"
echo ""
usage
fi
while getopts "hr:" OPTION;
do
case $OPTION in
r)
ROOTFS32b_PATH="$OPTARG"
;;
?)
help
;;
esac
done
ABS_PATH=`cd "${ROOTFS32b_PATH}"; pwd`
ROOTFS32b_PATH=${ABS_PATH}
if [[ ! -d ${ROOTFS32b_PATH} ]] ; then
usage
fi
if [[ ! -d ${ROOTFS32b_PATH}/dev ]] ; then
mkdir ${ROOTFS32b_PATH}/dev
fi
if [[ ! -d ${ROOTFS32b_PATH}/proc ]] ; then
mkdir ${ROOTFS32b_PATH}/proc
fi
if [[ ! -d ${ROOTFS32b_PATH}/sys ]] ; then
mkdir ${ROOTFS32b_PATH}/sys
fi
if [[ ! -d ${ROOTFS32b_PATH}/etc ]] ; then
mkdir ${ROOTFS32b_PATH}/etc
fi
umount ${ROOTFS32b_PATH}/dev/pts 2>/dev/null
umount ${ROOTFS32b_PATH}/dev 2>/dev/null
mount --bind /dev ${ROOTFS32b_PATH}/dev
if [[ "$?" != "0" ]] ; then
echo "Failed to mount /dev folder"
exit
fi
umount ${ROOTFS32b_PATH}/proc 2>/dev/null
mount --bind /proc ${ROOTFS32b_PATH}/proc
if [[ "$?" != "0" ]] ; then
echo "Failed to mount /proc folder"
exit
fi
umount ${ROOTFS32b_PATH}/sys 2>/dev/null
mount --bind /sys ${ROOTFS32b_PATH}/sys
if [[ "$?" != "0" ]] ; then
echo "Failed to mount /sys folder"
exit
fi
mount --bind /dev/pts ${ROOTFS32b_PATH}/dev/pts
if [[ "$?" != "0" ]] ; then
echo "Failed to mount /dev/pts folder"
exit
fi
cp /etc/resolv.conf ${ROOTFS32b_PATH}/etc/resolv.conf
if [[ "$?" != "0" ]] ; then
echo "Failed to copy resolv.conf file"
exit
fi
PATH=/bin:/sbin:/usr/bin:/usr/sbin
echo "New root will be ${ROOTFS32b_PATH}/ type \"exit\" to return to /"
chroot ${ROOTFS32b_PATH}/ /bin/sh
if [[ "$?" != "0" ]] ; then
echo "Failed to start chroot!"
fi
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