#!/bin/bash


set -e


VIGIL_PATH=$(realpath $(dirname $0))


function run_in_container {
    CONTAINER=$1
    shift
    [ -f $CONTAINER ] && OPTION="--image" || OPTION="--directory"
    sudo systemd-nspawn --chdir=/vigil --overlay=$VIGIL_PATH:/vigil \
	 $OPTION=$CONTAINER $@
}


function build_ubuntu {
    sudo debootstrap --components=main,restricted,universe,multiverse \
	 zesty ubuntu.part
    run_in_container ubuntu.part \
		     ln -sf /lib/systemd/resolv.conf /etc/resolv.conf
    run_in_container ubuntu.part apt-get update
    mv ubuntu.part ubuntu
}


function build_fedora {
    IMAGE="Fedora-Cloud-Base-25-1.3.x86_64.raw"
    wget --continue "https://dl.fedoraproject.org/pub/fedora/linux/releases/25/CloudImages/x86_64/images/$IMAGE.xz"
    unxz $IMAGE.xz
    mv $IMAGE fedora
}


function build_debian {
    sudo debootstrap --components=main,contrib,non-free \
	 --include=sudo jessie debian.part
    run_in_container debian.part apt-get update
    mv debian.part debian
}


function build_archlinux {
    ARCHIVE="archlinux-bootstrap-2017.05.01-x86_64.tar.gz"
    wget --continue "http://mirrors.kernel.org/archlinux/iso/latest/$ARCHIVE"
    tar -zxf $ARCHIVE
    mv root.x86_64 archlinux.part
    run_in_container archlinux.part pacman-key --init
    run_in_container archlinux.part pacman-key --populate archlinux
    echo "Server = http://mirror.rackspace.com/archlinux/\$repo/os/\$arch" > \
	 archlinux.part/etc/pacman.d/mirrorlist
    run_in_container archlinux.part pacman -Syyu --noconfirm
    run_in_container archlinux.part pacman -S --noconfirm sudo grep
    rm $ARCHIVE
    mv archlinux.part archlinux
}


[ $# -eq 0 ] && WORK_PATH=$(mktemp -d --suffix=-vigil) || WORK_PATH="$1"
sudo apt-get install -y systemd-container debootstrap xz-utils wget
cd $WORK_PATH
for DISTRIBUTION in ubuntu fedora debian archlinux; do
    if [ -e $DISTRIBUTION ]; then
	echo "$DISTRIBUTION container already exists."
    else
	echo "Building $DISTRIBUTION container..."
	build_$DISTRIBUTION
    fi
    echo "Installing vigil's dependencies in $DISTRIBUTION..."
    run_in_container $DISTRIBUTION ./install-dependencies
    echo "Successfully installed vigil's dependencies in $DISTRIBUTION."
    echo "Removing $DISTRIBUTION container..."
    sudo rm -rf $DISTRIBUTION
done
rmdir $WORK_PATH
echo "Finished."