#!/bin/sh
#
#
# Script to monitor disk usage.
#
# Parameters understood:
#
# 	config   (required)
# 	autoconf (optional - used by munin-config)
#
# Environment:
#       warning  Warning percentage, default 92
#       critical Critical percentage, default 98
#
# Magic markers (optional - used by munin-config and installation
# scripts):
#
#%# family=auto
#%# capabilities=autoconf

if [ "$1" = "autoconf" ]; then
	echo yes
	exit 0
fi

EXCLUDEDFS="-t noprocfs,devfs,fdescfs,linprocfs,linsysfs,sysfs,nfs,nullfs,cd9660"

if [ $(uname -s) = "GNU/kFreeBSD" ]; then
	# Debian ships df from GNU coreutils
	# use "-x" instead of "-t", split comma-separated list into single arguments
	EXCLUDEDFS=$(echo $EXCLUDEDFS | sed 's/^-t /-x /; s/,/ -x /g')
fi

if [ "$1" = "config" ]; then
	echo 'graph_title Disk usage in percent'
	echo 'graph_args --upper-limit 100 -l 0'
	echo 'graph_vlabel %'
	echo 'graph_category disk'
	echo 'graph_scale no'
	echo 'graph_info This graph shows disk usage on the machine.'
	mfs=0
	/bin/df -P $EXCLUDEDFS | tail -n +2 | sort | grep -v "//" | while read i; do
		case $i in
		mfs:*) name=mfs$mfs; mfs=`expr $mfs + 1`;;
		*) name=`echo $i | awk '{ gsub("[^a-zA-Z0-9_]", "_", $1); print $1 }'` ;;
		esac
		echo -n "$name.label "
		echo $i | awk '{ print $6 }'
		echo "$name.warning ${warning:-92}"
		echo "$name.critical ${critical:-98}"
	done
	exit 0
fi

mfs=0
/bin/df -P $EXCLUDEDFS | tail -n +2 | sort | grep -v "//" | while read i; do
	case $i in
	mfs:*) name=mfs$mfs; mfs=`expr $mfs + 1`;;
	*) name=`echo $i | awk '{ gsub("[^a-zA-Z0-9_]", "_", $1); print $1 }'` ;;
	esac
	echo -n "$name.value "
	echo $i | awk '{ if ($2 == 0) print 0; else printf("%.2f\n", 100.0 * ($2 - $4) / $2); }'
done