Munin contributed plugins

#! /bin/sh

# -*- sh -*-

: <<=cut

=head1 NAME

ntp_drift - Munin plugin to monitor the NTP drift value.

=head1 APPLICABLE SYSTEMS

Any ntpd host.

=head1 CONFIGURATION

The following configuration parameters are used by this plugin:

 [ntp_drift]

 env.driftfile - Path to driftfile.

=head2 DEFAULT CONFIGURATION

 [ntp_drift]

 env.driftfile "/var/lib/ntp/ntp.drift"

=head1 USAGE

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

=head1 AUTHOR

HORINOUCHI Masato <thermes+github@confei.to> 2019-07-16

=head1 LICENSE

Same as munin.

=head1 MAGIC MARKERS

#%# family=auto

#%# capabilities=autoconf

=cut

driftfile=${driftfile:-'/var/lib/ntp/ntp.drift'}

do_autoconf () {

    if [ -r "$driftfile" ]; then

        echo "yes"

    else

        echo "no (could not read driftfile '$driftfile'.)"

    fi

}

do_config () {

    cat <<'EOM'

graph_title NTP drift

graph_args --base 1000

graph_vlabel Parts Per Million

graph_category time

drift.label Frequency Offset

graph_info The frequency of the local clock oscillator. A single floating point number, which records the frequency offset measured in parts-per-million (PPM).

EOM

}

do_ () {

    if [ -r "$driftfile" ]; then

        echo "drift.value $(cat "$driftfile")"

    else

        echo "drift.value U"

    fi

}

case $1 in

    autoconf|config|'')

        do_"$1"

        ;;

    *)

        echo "Don't know how to do that" >&2

        exit 1

        ;;

esac