#!/bin/sh
#
# Script to monitor CPU usage of Xen domains
#
# Author: unknown
# Modifications: Sebastian Wyder <sebastian.wyder@me.com>, Matthias Pfafferodt, syntron@web.de, Roland Mohrbacher
# License: GPL v. 2
#
# Parameters understood:
#
#     conifg    (required)
#     autoconf  (optional - used by munin-config)
#
#%# family=auto
#%# capabilities=autoconf

# statefile: name of seen xen domains
statefile="$MUNIN_PLUGSTATE/munin-plugin-xen.state"

if [ "$1" = "autoconf" ]; then
        if which xm > /dev/null ; then
                echo yes
                exit 0
        fi
        echo "no (xm not found)"
        exit 1
fi

if [ "$1" = "config" ]; then

	if [ ! -e $statefile ]; then
		touch $statefile
	fi

        echo 'graph_title Xen Domain Utilisation'
        echo 'graph_args --base 1000 -l 0 --upper-limit 100 --rigid'
        echo 'graph_scale no'
        echo 'graph_vlabel %'
        echo 'graph_category Virtualization'
        echo 'graph_info This graph shows how many percent of the CPU time was used by each domain'

	xm list | grep -v "^Name .* Time(s)$" | \
        while read name domid mem cpu state time console; do
                name=`echo $name | sed -e"s/[-.]/_/g"`
		TEST=`less $statefile | grep "^${name}$" | wc -l`
		if [ $TEST -ne 1 ]; then
		    echo "$name" >> $statefile
		fi
	done

	FIRST=1
	cat $statefile | sort | \
        while read name; do
                echo "$name.label $name"
                echo "$name.type COUNTER"
		if [ $FIRST -eq 1 ]; then
            	    echo "$name.draw AREA"
		    FIRST=0
		else
            	    echo "$name.draw STACK"
		fi
                echo "$name.min 0"
                echo "$name.max 100"
                echo "$name.info % of the CPU time spent for $name"
        done
        exit 0
fi

xm list | grep -v "^Name .* Time(s)$" | \
while read name domid mem cpu state time console; do
        name=`echo $name | sed -e "s/[-.]/_/g"`
	# only seconds
        time=`echo $time | sed -e "s/\..//"`
	# scale 60s/60s => 100%/60s
	time=`echo "$time*100/60" | bc`
        echo "$name.value $time"
done
