#!/bin/sh
#----------------------------------------------------------------------------
# /usr/lib/systemd/scripts/capi-init - start/stop script for capir modules
#
# Creation:     2023-12-06  hbfl
# Last Update:  $Id$
#
# Copyright (c) 2017-@@YEAR@@ Holger Bruenjes, holgerbruenjes(at)gmx(dot)net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------

package_name='capi'

#exec 2> /tmp/capi-trace$$.log
#set -x

# ---------------------------------------------------------------------------
# usage
# ---------------------------------------------------------------------------
usage()
{
cat <<EOF

 Usage:
 ${0}
                -q, --quiet      suppress all normal output
                [start]
                [stop]

EOF

}

# ---------------------------------------------------------------------------
# unload module
#
# recursively unload a module and its dependencies, if possible.
# where's modprobe -r when you need it?
# inputs: module to unload.
# returns: the result from
# ---------------------------------------------------------------------------
unload_module()
{
    module="${1}"
    line=$(/usr/bin/grep "^${module} " /proc/modules)

    if [ -z "${line}" ]
    then
        return
    fi # module was not loaded

    set -- ${line}
    # $1: the original module
    # $2: size
    # $3: refcount
    # $4: deps list
    # use newline here to can do 'grep -v' not a space
    mods=$(echo ${4} | /usr/bin/tr , '\n')

    for mod in ${mods}
    do
        # run in a subshell, so it won't step over our vars:
        (
            unload_module ${mod}
        )
        # TODO: the following is probably the error handling we want:
        # if [ $? != 0 ]; then return 1; fi
    done
    /usr/sbin/modprobe -r ${module} 2>/dev/null
}

# ---------------------------------------------------------------------------
# start misdn
# ---------------------------------------------------------------------------
capi_start()
{
    # but this module is required, but loading it is doubtful,
    # that's why it is loaded here explicitly
    /usr/sbin/modprobe kernelcapi 2>/dev/null
}

# ---------------------------------------------------------------------------
# stop misdn
# ---------------------------------------------------------------------------
capi_stop()
{
    # find packages that use ISDN and stop them when mISDN is stopped
    stop_pack="$(/usr/bin/find /etc/capi.d -maxdepth 1 -type f -name "*" -printf '%f\n' 2>/dev/null)"
    if [ -n "${stop_pack}" ]
    then
        for _pack in ${stop_pack}
        do
            /usr/sbin/service stop ${_pack}
        done

        if [ -f /etc/systemd/system/eisfax-c2faxrecv.service ] &&
           [ ! -f /etc/capi.d/eisfax-c2faxrecv.service ]
        then
            /usr/sbin/service stop eisfax-c2faxrecv.service
        fi

        > /run/capi_start
    fi
    /usr/bin/sleep 2

    unload_module kernelcapi
}

# ---------------------------------------------------------------------------
# main
# ---------------------------------------------------------------------------
while [ ${#} -gt 0 ]
do
    case "${1}" in
    -q|--quiet)
        _quiet=true
        shift
        ;;
    *)
        _action=${1}
        shift
        ;;
    esac
done

case "${_action}" in
    start)
        capi_start
    ;;
    stop)
        capi_stop
    ;;
esac

exit 0
# ---------------------------------------------------------------------------
# end
# ---------------------------------------------------------------------------