log (){
	date +"[%T] $@" | tee -a ${LOG_FILE}
}

bootstrap(){
	ARCH=$(dpkg --print-architecture)

	export http_proxy=${APT_PROXY}

	if [ "$ARCH" !=  "armhf" ]; then
		BOOTSTRAP_CMD=qemu-debootstrap
	else
		BOOTSTRAP_CMD=debootstrap
	fi

	${BOOTSTRAP_CMD} --components=main,contrib,non-free \
		--arch armhf\
		--no-check-gpg \
		$1 $2 $3
}

copy_previous(){
	if [ ! -d ${PREV_ROOTFS_DIR} ]; then
		echo "Previous stage rootfs not found"
		false
	fi
	mkdir -p ${ROOTFS_DIR}
	rsync -aHAX ${PREV_ROOTFS_DIR}/ ${ROOTFS_DIR}/
}

unmount(){
	if [ -z "$1" ]; then
		DIR=$PWD
	else
		DIR=$1
	fi

	while mount | grep -q $DIR; do
		LOCS=`mount | grep $DIR | cut -f 3 -d ' ' | sort -r`
		for loc in $LOCS; do
			sudo umount $loc
		done
	done
}

on_chroot() {
	if ! mount | grep -q `realpath ${ROOTFS_DIR}/proc`; then
		mount -t proc proc ${ROOTFS_DIR}/proc
	fi

	if ! mount | grep -q `realpath ${ROOTFS_DIR}/dev`; then
		mount --bind /dev ${ROOTFS_DIR}/dev
	fi
	
	if ! mount | grep -q `realpath ${ROOTFS_DIR}/dev/pts`; then
		mount --bind /dev/pts ${ROOTFS_DIR}/dev/pts
	fi

	if ! mount | grep -q `realpath ${ROOTFS_DIR}/sys`; then
		mount --bind /sys ${ROOTFS_DIR}/sys
	fi

	chroot ${ROOTFS_DIR}/ "$@"
}

# This should be used if building on a system that uses systemd (?)
on_chroot2() {
	systemd-nspawn -D ${ROOTFS_DIR}/ "$@"
}

update_issue() {
	echo -e "Raspberry Pi reference ${DATE}\nGenerated using Pi-gen, https://github.com/RPi-Distro/Pi-gen, ${1}" > ${ROOTFS_DIR}/etc/rpi-issue
}