version.sh

#! /bin/bash
#
# version.sh: create a version string for use by configure.ac
#
#  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; version 2 of the License.
#
#  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, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

version=
datefmt='%Y%m%d'

export GIT_DIR=$(dirname $0)/.git/

if head=$(git rev-parse --short=8 --verify HEAD 2>/dev/null); then

	suffix=''
	# Add a '-dirty' suffix for uncommitted changes.
	if git diff-index HEAD | read dummy; then
		suffix=-dirty
	fi

	if tag=$(git describe --tags --exact-match 2>/dev/null); then
		# use a tag; remove any 'v' prefix from v<VERSION> tags
		tag=${tag#v}
		version=$(printf "%s%s" ${tag} ${suffix})
	else
		# Use the git commit revision for the package version, and add
		# a date prefix for easy comparisons.
		date=$(git log --pretty=format:"%ct" -1 HEAD)
		version=$(printf "%($datefmt)T.g%s%s" ${date} ${head} ${suffix})
	fi
else
	# Check if a specific version is set, eg: by buildroot
	if [ ! -z "$PACKAGE_VERSION" ];
	then
		# Full git hash
		len=$(echo -n "${PACKAGE_VERSION}" | wc -c)
		if [[ ${len} == 40 ]]; then
			version=`echo -n ${PACKAGE_VERSION} | \
				sed "s/^\([0-9a-f]\{7\}\).*/\1/;"`
		else
			version="$PACKAGE_VERSION"
		fi
	else
		# Default to current date and time.
		version="$(date +dev.$datefmt)"
	fi
fi

echo $version