#!/bin/sh -e

cmds="$(dirname "$(realpath -- "$0")")"
. "$cmds/env.rc"
cd "$1"
read url < url
[ -s etag ] && etag_compare="--etag-compare etag" || :
[ -r out ] && time_cond="--time-cond out" || :
[ -z "$FEEDER_CURL_VERBOSE" ] && silent="--silent" || silent="--verbose"
${CURL:-curl} --fail \
    --tcp-fastopen \
    --user-agent "$FEEDER_USER_AGENT" \
    --compressed \
    --location --max-redirs 2 \
    --dump-header hdr \
    --output out \
    --remote-time \
    --etag-save etag \
    --max-time $FEEDER_CURL_MAX_TIME \
    $etag_compare \
    $time_cond \
    $silent \
    "$url" >&2
if [ -s out ] ; then
    $ZSTD < out > feed.zst
    touch -r out feed.zst
    truncate -s 0 out
    touch -r feed.zst out
fi
$SHA512 < feed.zst > download.hash