#!/bin/bash

[ -f /.dockerenv ] || { echo "please run in supplied container"; exit 1; }
set -e

ARCH=$(uname -m)

cp /config/* /etc/apt/
apt update -o Acquire::Check-Valid-Until=false

until apt-get install \
    --download-only \
    --allow-downgrades \
    -o Acquire::Check-Valid-Until=false \
    -y $(cat /etc/apt/apt-pins-${ARCH}.list);
do
    echo "apt install failed. Likely throttled. Retrying in 10 mins...";
    sleep 600;
done;

(
	cd /var/cache/apt/archives \
		&& find . -type f \( -iname \*.deb \) -exec sha256sum {} \; \
		| sed 's/.\///g' \
		| LC_ALL=C sort
) > /etc/apt/apt-hashes-${ARCH}-compare.list

diff /etc/apt/apt-hashes-${ARCH}{,-compare}.list

mkdir -p /fetch/apt

mv /var/cache/apt/archives/*.deb /fetch/apt/
apt-get install -y dpkg-dev
env -C /fetch dpkg-scanpackages apt | gzip > /fetch/apt/Packages.gz