osbmk/resources/scripts/misc/versioncheck

#!/usr/bin/env bash

#	Copyright (C) 2021 Leah Rowe <info@minifree.org>
#
#	This program is free software: you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation, either version 3 of the License, or
#	(at your option) any later version.
#
#	This program is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#	GNU General Public License for more details.
#
#	You should have received a copy of the GNU General Public License
#	along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

version="version-unknown"
if [ -f version ]; then
	version="$(cat version)"
fi
version_="${version}"
if [ -e ".git" ]; then
	version="$(git describe --tags HEAD 2>&1)" \
	|| version="git-$(git rev-parse HEAD 2>&1)" \
	|| version="${version_}"
	printf "%s\n" "${version}" > version
fi

versiondate="version-date-unknown"
if [ -f versiondate ]; then
	versiondate="$(cat versiondate)"
fi
versiondate_="${versiondate}"
if [ -e ".git" ]; then
	versiondate="$(git show --no-patch --no-notes --pretty='%ct' HEAD)" \
	|| versiondate="${versiondate_}"
	printf "%s\n" "${versiondate}" > versiondate
fi