#!/bin/sh

: <<=cut

=head1 NAME

parse Chrony Tracking output for timeserver status information

=head1 APPLICABLE SYSTEMS

Any system with a local chronyd service.

=head1 CONFIGURATION

No configuration.

=head1 MAGIC MARKERS

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

=head1 VERSION

Revision 0.1 2008/08/23 13:06:00 joti

  First version only chronyc tracking, autodetection included.

Revision 0.2 2008/10/11 16:09:00 joti

  Added scaling of other values to match with frequency, added more description to fields

Revision 0.3 2014/02/16 zjttoefs

  reduce forking by using awk
  do not limit output precision
  add stratum monitoring
  detect slow/fast time or freqency and adjust sign of value accordingly
  remove commented out code

=head1 AUTHOR

  joti
  zjttoefs

=cut

# Modify this to fit other chronyc path
CHRONYC=/usr/bin/chronyc

# Frequency has extremely higher values than other. Therefore they are fitted by scaling. Adjust the factors here
fieldfactors="1 1000 1 100 100 1000 1000"
fields="stratum systime frequency residualfreq skew rootdelay rootdispersion"
fieldnames="Stratum (=System Time (seconds,x=Frequency (ppm,x=Residual Freq (ppm,x=Skew (ppm,x=Root delay(seconds,x=Root dispersion (seconds,x"

if [ "$1" = "autoconf" ]; then
	if [ -f "$CHRONYC" ]; then 
		echo yes
		exit 0
	else
		echo "no (no $CHRONYC)"
		exit 1
	fi
fi

if [ "$1" = "config" ]; then
        echo 'graph_title Chrony Tracking Stats'
        echo 'graph_args --base 1000 -l 0'
        echo 'units (seconds,ppm)'
	echo 'graph_category time'    
		i=0
		for a in $fields ; do
			i=$((i + 1))
			word="$(echo "$fieldnames" | cut -f "$i" -d '=')"
			factor="$(echo "$fieldfactors" | cut -f "$i" -d ' ')"
			echo "$a.label $word$factor)";
			echo "$a.type GAUGE"
		done
        exit 0
fi

# remove non-needed output lines, remove labels, rescale and label values while detecting slow/fast keywords
chronyc tracking | sed -e 1d -e 3d -e "s/.*://" | \
	awk -v FAC="$fieldfactors" -v NAM="$fields" \
	'BEGIN { split(FAC,factors," "); split(NAM,names," "); } 
	{ /slow/ ? SIGN=-1 : SIGN=1 ; print names[NR]".value ",SIGN*$1*factors[NR]}'