#!/bin/sh
# Filename:      blacklist / unblacklist
# Purpose:       blacklist module via module-init-tools
# Authors:       grml-team (grml.org), (c) Michael Prokop <mika@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2.
################################################################################

PN="$(basename "$0")"
[ -n "$MODPROBEFILE" ] || MODPROBEFILE=/etc/modprobe.d/grml.conf
# shellcheck disable=SC1091
[ -r /etc/grml/lsb-functions ] && . /etc/grml/lsb-functions

if [ -z "$1" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
  echo "Usage: $PN <module>"
  echo "$PN (un)blacklists module via $MODPROBEFILE"
  exit 1
fi

if [ "$(id -ru)" != "0" ] ; then
  echo "Error: become root before starting $0" >& 2
  exit 100
fi

[ -f "$MODPROBEFILE" ] || touch "$MODPROBEFILE"

if [ "$PN" = 'blacklist' ] ; then
  if grep -q "^blacklist $1\$" $MODPROBEFILE ; then
    eerror "Module $1 already on blacklist in $MODPROBEFILE" ; eend 1
  else
    einfo "Adding module $1 to blacklist $MODPROBEFILE"

    if ! modinfo "${1}" >/dev/null 2>&1 ; then
      ewarn "Notice: module $1 does not seem to exist. Adding anyway."
      eend 0
    fi

    echo "blacklist $1" >> $MODPROBEFILE
    echo "alias $1 off" >> $MODPROBEFILE ; eend $?
  fi
fi

if [ "$PN" = 'unblacklist' ] ; then
  if grep -q "^blacklist $1" $MODPROBEFILE ; then
    einfo "Removing module $1 from blacklist $MODPROBEFILE"
    sed -i "s/^blacklist.*$1$/# &/" $MODPROBEFILE
    sed -i "s/^alias.*$1 off$/# &/" $MODPROBEFILE ; eend $?
  else
    eerror "Module $1 not blacklisted in $MODPROBEFILE" ; eend 1
  fi
fi

## END OF FILE #################################################################