#!/bin/bash

set -eu
set -o pipefail

DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-}

[ -n "$DIB_DISTRIBUTION_MIRROR" ] || exit 0

sudo sed -ie "s&http://\(archive\|security\).ubuntu.com/ubuntu&$DIB_DISTRIBUTION_MIRROR&" \
    /etc/apt/sources.list