#!/bin/sh

set -e

cache_dir='/var/cache/buff-di-wuff'

mkdir -p "${cache_dir}"

grep '^[^#]' '/etc/buff-di-wuff.list' | \
  while read -r url; do
    if ! wget -O "${cache_dir}/tmp" "${url}" 2> /dev/null; then
      continue
    fi
    sum512="$(
      sha512sum "${cache_dir}/tmp" | \
        cut -d' ' -f1
    )"
    sum256="$(
      sha256sum "${cache_dir}/tmp" | \
        cut -d' ' -f1
    )"
    if [ ! -f "${cache_dir}/${sum512}" ]; then
      mv "${cache_dir}/tmp" "${cache_dir}/${sum512}"
    else
      rm "${cache_dir}/tmp"
    fi
    if [ ! -f "${cache_dir}/${sum256}" ]; then
      ln "${cache_dir}/${sum512}" "${cache_dir}/${sum256}"
    fi
  done