unbox/unbox.sh

#!/bin/bash


source $(dirname $(realpath $0))/utils.sh

function unbox_outer_stage(){
	echo "-----------FIRST STAGE-----------"

	apt install git util-linux

	if [ -e .repo_cache ]; then
		select chosen_repo in other $(cat .repo_cache | sort | uniq); do
			if [ "${chosen_repo}" = "other" ]; then
				echo -n "git repository url: "
				read REMOTE
			else
				REMOTE=$chosen_repo
			fi
			break
		done
	else
		echo -n "git repository url: "
		read REMOTE
	fi

	echo $REMOTE
	URL_CACHE=$( ( cat .repo_cache; echo $REMOTE;)  )
	for LINE in $URL_CACHE; do echo $LINE; done | sort | uniq > .repo_cache

	if [ -e repo ]; then
		(cd repo; git pull)
	else
		git clone "$REMOTE" repo
	fi

	if [[ ! -e repo/entry.sh ]]; then
		echo no entry found;
		exit 1;
	fi

	source repo/entry.sh

	mkdir -p target
	export TARGET=$(pwd)/target
	export UNBOX_ENV_FILE=$(pwd)/.env
	
	if [ -e .env ]; then
		rm .env
	fi
	

	if type -t first_stage > /dev/null; then
		first_stage
	else
		echo first stage not found
	fi

	if type -t chroot > /dev/null; then
		CHROOT=chroot
	else
		echo ERROR: no chroot found 1>&2
		exit 1
	fi

	mkdir -p target/root/unbox
	mount -o bind . target/root/unbox
	mkdir -p target/root/unbox_data
	mount -o bind /data target/root/unbox_data
	(
		mount -obind /sys target/sys
		mount -obind /proc target/proc
		mount -obind /dev target/dev
		mount -obind /dev/pts target/dev/pts
		
		resolv_conf=target/etc/resolv.conf

		if [[ -L target/etc/resolv.conf ]]; then
		
			resolv_conf=$(readlink "target/etc/resolv.conf")
			if [[ $resolv_conf = /* ]]; then
			  resolv_conf=target$resolv_conf
			else
			  resolv_conf=target/etc/$resolv_conf
			fi

			# ensure file exists to bind mount over
			if [[ ! -f $resolv_conf ]]; then
			  install -Dm644 /dev/null "$resolv_conf" || return 1
			fi
		fi
		
		if [[ -e target/etc/resolv.conf ]]; then
			cp -L /etc/resolv.conf $resolv_conf
		fi
		
		$CHROOT target /root/unbox/unbox.sh unbox_inner_stage
		umount /dev/pts
		umount /dev /sys /proc
	)
	umount target/root/unbox target/root/unbox_data
	
	if type -t post_install_stage > /dev/null; then
		post_install_stage
	else
		echo no post_install_stage found
	fi
	if [ -e ${UNBOX_ENV_FILE} ]; then
		rm ${UNBOX_ENV_FILE}
	fi
	exit 0
}

function unbox_inner_stage(){
	echo "-----------SECOND STAGE-----------"
	export UNBOX_ENV_FILE=$(pwd)/.env
	if [ -e ${UNBOX_ENV_FILE} ]; then
		source ${UNBOX_ENV_FILE}
	fi
	if [ -e repo/entry.sh ]; then
		source repo/entry.sh
	else
		echo chosen repository does not contain entry.sh file
	fi
	if type -t second_stage > /dev/null; then
		second_stage
	else
		echo second stage not found
	fi
	if [ -e ${UNBOX_ENV_FILE} ]; then
		rm ${UNBOX_ENV_FILE}
	fi
	exit 0
}

cd $(dirname $(realpath $0))
if [[ $# -ge 1 ]]; then 
	CMD=$1
	shift
	if type -t $CMD > /dev/null; then
		$CMD $@
	else
		echo command $CMD found
		exit 1
	fi
else
	git pull
	$0 unbox_outer_stage
fi