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

cat /etc/apt/packages-old.list | sed 's/=.*//g' \
	> /etc/apt/packages.list

apt-get update
apt-get install -y --download-only $(cat /etc/apt/packages.list)

snapshot_date=$(date -d @${GIT_EPOCH} +"%Y%m%dT000000Z")
cat <<-EOF > /etc/apt/sources.list
deb https://deb.debian.org/debian buster main
deb https://snapshot.debian.org/archive/debian/${snapshot_date} buster main
deb http://security.debian.org/debian-security buster/updates main
deb https://snapshot.debian.org/archive/debian-security/${snapshot_date} buster/updates main
deb http://deb.debian.org/debian buster-updates main
deb https://snapshot.debian.org/archive/debian/${snapshot_date} buster-updates main
EOF

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

cp /dev/null /etc/apt/packages.list
for deb in /var/cache/apt/archives/*.deb; do
	package=$(dpkg-deb -f $deb Package);
	version=$(dpkg --info ${deb} | grep "^ Version: " | sed 's/^ Version: //g');
	echo "${package}=${version}" >> /etc/apt/packages.list;
done