#!/bin/bash

# We're passed the version of the kernel being installed
inst_kern=$1

uname_s=$(uname -s)

_get_kernel_dir() {
    KVER=$1
    case ${uname_s} in
       Linux)          DIR="/lib/modules/$KVER/build" ;;
       GNU/kFreeBSD)   DIR="/usr/src/kfreebsd-headers-$KVER/sys" ;;
    esac
    echo $DIR
}

_check_kernel_dir() {
    DIR=$(_get_kernel_dir $1)
    case ${uname_s} in
       Linux)          test -e $DIR/include ;;
       GNU/kFreeBSD)   test -e $DIR/kern && test -e $DIR/conf/kmod.mk ;;
       *)              return 1 ;;
    esac
    return $?
}

case "${uname_s}" in
    Linux)
        header_pkg="linux-headers-$inst_kern"
        kernel="Linux"
    ;;
    GNU/kFreeBSD)
        header_pkg="kfreebsd-headers-$inst_kern"
        kernel="kFreeBSD"
    ;;
esac

if [ -x /usr/lib/dkms/dkms_autoinstaller ]; then
    exec /usr/lib/dkms/dkms_autoinstaller start $inst_kern > /dev/null
fi

if ! _check_kernel_dir $inst_kern ; then
    echo "dkms: WARNING: $kernel headers are missing, which may explain the above failures." >&2
    echo "      please install the $header_pkg package to fix this." >&2
fi