script for easy chrooting. adapted from an answer on stackoverflow which I can't find anymore

chroot.sh

#!/bin/bash

if [ -z "$1" ]; then
    echo "Usage: $0 CHROOT_PATH [PROGRAM]"
    exit 1
fi

CHROOT_PATH="$1"
PROGRAM="$2"

BIND_DIRS="/proc /dev /dev/pts /dev/shm"

start()
{
    for DIR in $BIND_DIRS; do
        echo "Binding $DIR to ${CHROOT_PATH}${DIR}"
        mkdir -p "${CHROOT_PATH}${DIR}"
        mount --bind "$DIR" "${CHROOT_PATH}${DIR}"
    done
}

stop()
{
    # Unmount in reverse order
    for DIR in `echo "$BIND_DIRS" | sed -e 's/ /\n/g' | tac`; do
        echo "Ubinding ${CHROOT_PATH}${DIR}"
        umount "${CHROOT_PATH}${DIR}"
    done
}


start

echo "Chroot..."

export LC_ALL=C
me=`whoami`
chroot --userspec=$me:$me "$CHROOT_PATH" "$PROGRAM"

stop