changeRoot.sh

#!/bin/sh
# Taken mostly from Gentoo's handbok

newRoot="$1"
printf "chroot into '$newRoot'?(y/N) "
read confirm

[ "$confirm" = "y" ] && {
	# Mount required filesystems
	mkdir -p "$newRoot"
	mount --types proc /proc "$newRoot/proc"
	mount --rbind /sys "$newRoot/sys"
	mount --make-rslave "$newRoot/sys"
	mount --rbind /dev "$newRoot/dev"
	mount --make-rslave "$newRoot/dev"
	mount --bind /run "$newRoot/run"
	mount --make-slave "$newRoot/run "

	# Check if /dev/shm isn't just a link
	test -L /dev/shm && rm /dev/shm && mkdir /dev/shm
	mount --types tmpfs --options nosuid,nodev,noexec shm /dev/shm
	chmod 1777 /dev/shm /run/shm

	# Chroot
	chroot "$newRoot" /bin/bash
	source /etc/profile
	export PS1="(*) ${PS1}"
}