munin plugin for freebsd for monitoring fan rotation ibm_acpi

ibm_acpi_fan

#!/usr/bin/env bash
# -*- sh -*-
: <<=cut

=head1 NAME

acpi_ibm - Munin plugin to monitor the fan speed returned by ACPI probe.

=head1 APPLICABLE SYSTEMS

FreeBSD systems with ACPI support. man acpi_ibm(4)

=head1 CONFIGURATION

add ibm_acpi in loader.conf

=head1 USAGE

Link this plugin to @@CONFDIR@@/plugins/ and restart the munin-node.

=head1 INTERPRETATION

The plugin shows the fans' speeds.

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=head1 BUGS

None known.

=head1 VERSION

v1.1 - 2024-03-24

=head1 AUTHOR

Julien Tayon (julien@tayon.net)

=head1 LICENSE

GPLv2

=cut

NB_FAN=$( sysctl -a | grep fan_speed | wc -l )

do_ () { # Fetch
    if sysctl dev.acpi_ibm.0.fan_speed &> /dev/null; then
	    # man acpi_ibm
	    for ((i=0;i<$NB_FAN;i++)); do 
		    echo -n "FAN_$i.value ";  
		    sysctl dev.acpi_ibm.$i.fan_speed | cut -d " " -f2; 
	    done
    fi

    exit 0
}

do_config () {
    echo "graph_title ACPI Fan rotation"
    echo "graph_vlabel rotations per minute"
    echo "graph_category sensors"
    echo "graph_info This graph gives rotation per minutes for each fans in ACPI table"
    for ((i=0;i<$NB_FAN;i++)); do 
             echo "FAN_$i.label fan_$i"
    done
    # print values immediately if dirtyconfig is supported
    if [ "${MUNIN_CAP_DIRTYCONFIG:-0}" = 1 ]; then do_; fi
}

do_autoconf () {
    if [[ $NB_FAN == 0 ]]; then
        echo "no (sysctl dev.acpi_ibm.0.fan_speed not found)"
	exit 0
    fi
    echo yes
    exit 0
}

case $1 in
    config|autoconf|'')
	"do_$1"
esac

exit $?