ch-mount.sh

#!/bin/bash
 
function mnt() {
    echo "MOUNTING"
#    sudo chown -R root:root ${2}
    sudo mount -t proc /proc ${2}/proc
    sudo mount -t sysfs /sys ${2}/sys
    sudo mount -o bind /dev ${2}/dev
 
    sudo chroot ${2}
}
 
function umnt() {
    echo "UNMOUNTING"
	sudo sync
	sleep 3
    sudo umount ${2}/proc
    sudo umount ${2}/sys
    sudo umount ${2}/dev
 
}
 
 
if [ "$1" == "-m" ] && [ -n "$2" ] ;
then
    mnt $1 $2
    umnt $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