ch-mount.sh

#!/bin/bash
#
function mnt() {
        echo "MOUNTING"
        sudo mount -t proc /proc ${2}proc
        sudo mount -t sysfs /sys ${2}sys
        sudo mount -o bind /dev ${2}dev
        sudo mount -o bind /dev/pts ${2}dev/pts
        sudo chroot ${2}
}

function umnt() {
        echo "UNMOUNTING"
        sudo umount ${2}proc
        sudo umount ${2}sys
        sudo umount ${2}dev/pts
        sudo umount ${2}dev
}

if [ "$1" == "-m" ] && [ -n "$2" ] ;
then
        mnt $1 $2
elif [ "$1" == "-u" ] && [ -n "$2" ];
then
        umnt $1 $2
else
        echo ""
        echo "Either 1'st, 2'nd or both parameters were missing"
        echo ""
        echo "1'st parameter can be one of these: -m(mount) OR -u(umount)"
        echo "2'nd parameter is the full path of rootfs directory(with trailing '/')"
        echo ""
        echo "For example: ch-mount -m /media/sdcard/"
        echo ""
        echo 1st parameter : ${1}
        echo 2nd parameter : ${2}
fi