#!/usr/bin/env sh
set -eu

sources="/etc/apt/sources.list.d/debian.sources"

if [ ! -f "$sources" ]; then
    exit 0
fi

debian_mirror="${DEBIAN_APT_MIRROR:-}"
security_mirror="${DEBIAN_SECURITY_APT_MIRROR:-}"
disable_updates="${DEBIAN_APT_DISABLE_UPDATES:-false}"

if [ -n "$debian_mirror" ]; then
    sed -i \
        -e "s|^URIs: https\\?://deb\\.debian\\.org/debian$|URIs: $debian_mirror|g" \
        "$sources"
fi

if [ -n "$security_mirror" ]; then
    sed -i \
        -e "s|^URIs: https\\?://deb\\.debian\\.org/debian-security$|URIs: $security_mirror|g" \
        -e "s|^URIs: https\\?://security\\.debian\\.org/debian-security$|URIs: $security_mirror|g" \
        "$sources"
fi

case "$disable_updates" in
    1|true|TRUE|yes|YES)
        sed -i -e '/^Suites:/ s| bookworm-updates||g' "$sources"
        ;;
esac