#!/bin/sh

set -eu

umask 022

cd /srv/web/oob.foo.sh/routeros

verbose=false
if [ "${1:-}" = "-v" ]; then
    verbose=true
    shift
fi

if [ $# -gt 0 ]; then
    echo "Usage: $(basename "$0") [-v]" 1>&2
    exit 1
fi

packageurl="$(curl -sSf "https://mikrotik.com/download" | \
    sed -n 's/.*<a href="\(.*routeros-[0-9\.]*-arm\.npk\)">.*/\1/p')"
packagename="$(basename "$packageurl")"
if [ -f "$packagename" ]; then
    "$verbose" && echo "Already up to date"
    exit 0
fi

checksum="$(curl -sSf "https://mikrotik.com/download" | \
	sed -n 's/.*routeros-[0-9\.]*-arm\.npk<\/td>.*<td>SHA256<\/td><td>\(.*\)<\/td>.*/\1/p')"

echo "Downloading new package '${packagename}'"
trap 'rm -f -- "${packagename}.tmp"' EXIT
curl -sSf -o "${packagename}.tmp" "$packageurl"

if [ "$(sha256sum "${packagename}.tmp" | cut -d " " -f 1)" != "$checksum" ]; then
    echo "ERR: Checksum check failed, not saving package" 1>&2
    exit 1
fi

mv "${packagename}.tmp" "$packagename"