#!/bin/sh

if test $# -lt 1
then
    echo 1>&2 "Usage: $0 \$srcdir/.tarball-version"
    exit 1
fi

VF=$1

# First see if there is a version file,
# then try git-describe, otherwise fail.
if test -f $VF
then
    VN=$(cat $VF)
elif test -d ${GIT_DIR:-.git} -o -f .git &&
    V=$(git describe --match "[0-9]*" --abbrev=7 --tags 2>/dev/null)
then
    VN=$V
else
    echo 1>&2 "$0: Failed to determine revision"
    exit 1
fi

# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$VN" | tr -d '\012'