#!/bin/bash
#
# This script is used to generate the update files for freewvs.
# You do not need it if you merely want to use freewvs.
#
# SPDX-License-Identifier: 0BSD

TARGETDIR="$HOME/websites/freewvsdb.schokokeks.org/htdocs/"
GITDIR="$HOME/gitmirror/freewvs/"

TIMESTAMP=$(git --git-dir $GITDIR.git --no-pager log --format=%ct -1)

TIMESTAMP_OLD=0
if [ -e "$TARGETDIR/freewvsdb.timestamp" ]; then
	TIMESTAMP_OLD=$(cat "$TARGETDIR/freewvsdb.timestamp")
fi

if [ "$TIMESTAMP" -lt "$TIMESTAMP_OLD" ]; then
	echo "ERROR: New timestamp is smaller than old timestamp"
	exit 1
fi

if [ "$TIMESTAMP" -eq "$TIMESTAMP_OLD" ]; then
	# nothing to do
	exit 0
fi

# We try to be as reproducible as possible, see
# https://h2.jaguarpaw.co.uk/posts/reproducible-tar/
pushd $GITDIR/freewvsdb >/dev/null
tar --sort=name --mtime="@$TIMESTAMP" --owner=0 --group=0 --numeric-owner \
	--strip-components=99 \
	-cJf $TARGETDIR/$TIMESTAMP.tar.xz \
	*.json
popd >/dev/null
echo -n $TIMESTAMP >$TARGETDIR/freewvsdb.timestamp