#!/bin/sh

DEFAULT_VERSION=2.13.51
LVF=LUSTRE-VERSION-FILE

LF='
'

if test -d ${GIT_DIR:-.git} -o -f .git &&
        VN=$(git describe --match "[0-9]*" --abbrev=7 HEAD 2>/dev/null) &&
        case "$VN" in
        *$LF*) (exit 1) ;;
        [0-9]*)
                git update-index -q --refresh
                test -z "$(git diff-index --name-only HEAD --)" ||
                VN="$VN-dirty" ;;
        esac
then
        VN=$(echo "$VN" | sed -e 's/-/_/g');
elif test -r $LVF
then
        VN=$(sed -e 's/^LUSTRE_VERSION = //' <$LVF)
else
        VN="$DEFAULT_VERSION"
fi

if test -r $LVF
then
        VC=$(sed -e 's/^LUSTRE_VERSION = //' <$LVF)
else
        VC=unset
fi
test "$VN" = "$VC" || {
        echo "LUSTRE_VERSION = $VN" >$LVF
}

echo $VN