#!/bin/sh

tarball_version_file=VERSION

# Use tarball version file (included in release tarballs) if present,
# otherwise, try git-describe
if test -f $tarball_version_file
then
    v=$(cat $tarball_version_file) || v=
fi

if test "x$v" != "x"
then
    : # use $v
# Make sure it's a Git tree
elif test "$(git log -1 --pretty=format:x 2>&1)" = "x"
then
    v=$(git describe --match 'v[0-9]*' HEAD 2>/dev/null | sed -e 's/^v//') \
        || v="UNKNOWN"

    # Append "-dirty" suffix if there is local change
    git update-index --refresh > /dev/null 2>&1
    if test "x$(git diff-index --name-only HEAD 2>/dev/null)" != "x"
    then
        v="$v-dirty"
    fi
fi

printf "%s" "$v"