#!/bin/bash -e

# pass your docker hub login name as $1, defaults to your user name
# you should have a repositories named ubuntu and debian
# if you have your own repository, you can also prepend it:
# my.repo.url:5000/myname the script will then append ubuntu or debian
# e.g. to my.repo.url:5000/myname/ubuntu:trusty-amd64
# please login to docker before you start this script
docker_user=${1:-${docker_user:-$(id -un)}}

if test -f /etc/setup-debootstrap.conf; then
    . /etc/setup-debootstrap.conf
fi

archs=${archs:-"i386 amd64"}

ubuntu=${ubuntu:-"wily vivid trusty precise"}
debian=${debian:-"jessie wheezy squeeze sid"}
distros="${ubuntu} ${debian}"
tmpdir=${tmpdir:-"/var/tmp"}
packages=(${packages:-"python-software-properties software-properties-common|software-properties-common|python-software-properties" "apt-transport-https dpkg-dev lsb-release"})

for arch in ${archs}; do
    for distro in ${distros}; do
        if test "${ubuntu//${distro}/}" != "${ubuntu}"; then
            type="ubuntu"
        else
            type="debian"
        fi
        echo "******** process $type $distro $arch ********" 1>&2
        if test -d "${tmpdir}/${distro}-${arch}"; then
            echo " ++++    already exists ${tmpdir}/${distro}-${arch}" 1>&2
        else
            echo " ----    install ${tmpdir}/${distro}-${arch}" 1>&2
            sudo debootstrap --arch="$arch" "$distro" "${tmpdir}/${distro}-${arch}"
        fi
        echo " ----    upgrade ${tmpdir}/${distro}-${arch}" 1>&2
        sudo chroot "${tmpdir}/${distro}-${arch}" apt-get update
        sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -y upgrade
        sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -y dist-upgrade
        for package in "${packages[@]}"; do
            echo " ----    install ${package//|/ or } to ${tmpdir}/${distro}-${arch}" 1>&2
            IFS='|' read -r -a pkgs <<< "$package"
            success=0
            for pkg in "${pkgs[@]}"; do
                if sudo chroot "${tmpdir}/${distro}-${arch}" apt-get install -y ${pkg}; then
                    success=1;
                    break;
                fi
            done
            test $success -eq 1
        done
        echo " ----    import ${tmpdir}/${distro}-${arch} to ${docker_user}/${type}:${distro}-${arch}" 1>&2
        cd "${tmpdir}/${distro}-${arch}"
        sudo tar c . | docker import - "${docker_user}/${type}:${distro}-${arch}"
        echo " ----    push ${tmpdir}/${distro}-${arch} to ${docker_user}/${type}:${distro}-${arch}" 1>&2
        docker push "${docker_user}/${type}:${distro}-${arch}"
    done
done