#!/bin/sh

GVF=GIT-VERSION-FILE
DEF_VER=v1.9.2

LF='
'

describe () {
	VN=$(git describe --match "v[0-9]*" --abbrev=7 HEAD 2>/dev/null) || return 1
	case "$VN" in
	*$LF*)
		return 1
		;;
	v[0-9]*)
		git update-index -q --refresh
		test -z "$(git diff-index --name-only HEAD --)" ||
		VN="$VN-dirty"
		return 0
		;;
	esac
}

# First see if there is a version file (included in release tarballs),
# then try 'git describe', then default.
if test -f version
then
	VN=$(cat version) || VN="$DEF_VER"
elif test -d ${GIT_DIR:-.git} -o -f .git && describe
then
	VN=$(echo "$VN" | sed -e 's/-/~/g')
else
	VN="$DEF_VER"
fi

VN=$(expr "$VN" : v*'\(.*\)')

if test -r $GVF
then
	VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
else
	VC=unset
fi
test "$VN" = "$VC" && exit
echo >&2 "GIT_VERSION = $VN"
echo "GIT_VERSION = $VN" >$GVF