#!/bin/bash

readonly DISTRIB=stretch
readonly INIT_DIR=$PWD
readonly ARCHS="amd64 i386 armhf armel arm64"

function main()
{
    for ARCH in $ARCHS
    do
        build_image $ARCH
    done
}

function build_image()
{
    local ARCH=$1
    local CHROOT=chroot-${DISTRIB}-${ARCH}

    echo ""
    echo "Starting build for $ARCH"
    echo ""

    cd /tmp/
    cdebootstrap --arch=${ARCH} --foreign ${DISTRIB} ./$CHROOT http://deb.debian.org/debian/
    cp /usr/bin/qemu-arm-static $CHROOT/usr/bin/
    cp /usr/bin/qemu-aarch64-static $CHROOT/usr/bin/
    cp /etc/resolv.conf $CHROOT/etc/resolv.conf 

    chroot $CHROOT apt-get update
    chroot $CHROOT apt-get dist-upgrade
    chroot $CHROOT apt-get install -y build-essential debhelper cmake wget devscripts

    if [ "$ARCH" == "amd64" ];
    then
        chroot $CHROOT wget -q -O /tmp/setup_nodejs https://deb.nodesource.com/setup_4.x
        chroot $CHROOT bash /tmp/setup_nodejs
        chroot $CHROOT apt-get install -y nodejs
    fi

    chroot $CHROOT apt-get clean

    cd $CHROOT
    tar -czf $INIT_DIR/${DISTRIB}-${ARCH}.tgz ./*

    echo ""
    echo "Output image should be available as $INIT_DIR/${DISTRIB}-${ARCH}.tgz"
    echo ""
}

main