#!/usr/bin/env bash

#set -o xtrace
set -o errexit -o nounset -o pipefail -o errtrace
IFS=$'\n\t'

cd /usr/lib/modules/saved-kernel-modules

running_kernel=$(uname -r)

# remove symlink if it exists as a precaution
if [ -L /usr/lib/modules/"$running_kernel" ] ; then
    rm -f /usr/lib/modules/"$running_kernel"
fi

# is it already saved?
if [ -e modules/"$running_kernel" ] ; then
    exit 0
fi

mkdir -p modules

# copy with hardlinks, much faster
cp --archive --link /usr/lib/modules/"$running_kernel" modules/