#!/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

w1_ - Plugin to monitor 1-wire temperature sensors (DS1820)

=head1 CONFIGURATION

The following environment variables are used by this plugin

 sensorid     - Sensor to check. By default taken from command name.
 t_warn       - Warning limit for nagios notification
 t_crit       - Critical limit for nagios notification


=head1 AUTHOR

Copyright (C) 2016 Roland Steinbach

=head1 LICENSE

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; version 2 dated June, 1991.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf suggest
=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

case $0 in
    *w1_*)
        sensor_id=${0##*/w1_}
        ;;
esac

if [ "$1" = "suggest" ]; then
    if [ -r /sys/bus/w1/devices ]; then
        ls /sys/bus/w1/devices|grep -v bus_master
    fi
    exit 0
fi

if [ "$1" = "autoconf" ]; then
        if [ -r /sys/bus/w1/devices ]; then
            echo yes
            exit 0
        else
            echo "no (/sys/bus/w1/devices not found)"
            exit 0
        fi
fi

if [ "$1" = "config" ]; then
        echo graph_title Temperature Sensor $sensor_id
        echo 'graph_args --base 1000 -l 0'
        echo 'graph_vlabel temperature (°C)'
        echo 'graph_category sensors'
        echo 'graph_info This graph shows 1-wire sensor temperature.'
        echo "w1.label $sensor_id"
        echo "w1.info Temperature at $sensor_id."
        print_warning w1
        print_critical w1
        exit 0
fi


sed  -n '/t=/ s/.*t=//p' /sys/bus/w1/devices/$sensor_id/w1_slave | awk '{print "w1.value", $1/1000}'