#!/bin/sh

set -e

VERSION="$1"

if [ x"$VERSION" = x"" ]; then
    echo "Usage: $0 <version>"
    echo
    echo "  Example:   $0 arping-2.11"
    exit 1
fi

if [ x"$VERSION" = x"latest" ]; then
    VERSION="$(git tag | tail -1)"
fi

if [ x"$VERSION" = x"HEAD" ]; then
    VERSION="$(git describe)"
fi

OUTPUT="$VERSION.tar.gz"
echo "Writing $OUTPUT"

GITDIR="$(realpath .)"
TMPDIR="$(mktemp -d)"

(
    cd "$TMPDIR"
    mkdir "$VERSION"
    cd "$VERSION"
    git init
    git fetch "$GITDIR"
    git fetch --tags "$GITDIR"
    git checkout "$VERSION"
    rm -fr .git
    autoreconf -i
    cd ..
    tar cfz - "$VERSION" > "$GITDIR/$OUTPUT"
)
rm -fr -- "$TMPDIR"