#!/bin/sh

# This script is called by "systemctl enable/disable" when the given unit is a

# SysV init.d script. It needs to call the distribution's mechanism for

# enabling/disabling those, such as chkconfig, update-rc.d, or similar. This

# can optionally take a --root argument for enabling a SysV init script

# in a chroot or similar.

set -e

usage() {

    echo "Usage: $0 [--root=path] enable|disable|is-enabled <sysv script name>" >&2

    exit 1

}

unset ROOT

# parse options

eval set -- "$(getopt -o r: --long root: -- "$@")"

while true; do

    case "$1" in

        -r|--root)

            ROOT="$2"

            shift 2 ;

        --) shift ; break ;

        *) usage ;

    esac

done

NAME="$2"

[ -n "$NAME" ] || usage

case "$1" in

    enable)

        # call the command to enable SysV init script $NAME here

        # (consider optional $ROOT)

        update-rc.d -f $NAME defaults

        ;

    disable)

        # call the command to disable SysV init script $NAME here

        # (consider optional $ROOT)

        update-rc.d -f $NAME remove

        ;

    is-enabled)

        # exit with 0 if $NAME is enabled, non-zero if it is disabled

        # (consider optional $ROOT)

        /etc/init.d/$NAME status

        ;

    *)

        usage ;

esac