#!/bin/bash
# SPDX-License-Identifier: MIT

set -x

: ${LXC_IP_PREFIX:=10.0.8}

function install_docker() {
    if ! systemctl is-active --quiet docker; then
        echo deb http://deb.debian.org/debian bullseye-backports main | tee /etc/apt/sources.list.d/backports.list && apt-get update
        DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends --quiet -y -t bullseye-backports git docker.io
    fi
}

function install_lxc() {
    if ! systemctl is-active --quiet lxc-net; then
	apt-get update
	DEBIAN_FRONTEND=noninteractive apt-get install -y -qq make git libvirt0 libpam-cgfs bridge-utils uidmap dnsmasq-base dnsmasq dnsmasq-utils qemu-user-static
	systemctl disable --now dnsmasq
	apt-get install -y -qq lxc
	systemctl stop lxc-net
	cat >> /etc/default/lxc-net <<EOF
LXC_ADDR="$LXC_IP_PREFIX.1"
LXC_NETMASK="255.255.255.0"
LXC_NETWORK="$LXC_IP_PREFIX.0/24"
LXC_DHCP_RANGE="$LXC_IP_PREFIX.2,$LXC_IP_PREFIX.254"
LXC_DHCP_MAX="253"
EOF
	systemctl start lxc-net
    fi
}

function install_other() {
    local packages="sudo"
    if ! which $packages ; then
	apt-get install -y -qq $packages
    fi
}

function setup() {
    install_other
    install_docker
    install_lxc
}

setup