#!/bin/bash
set -Ceuo pipefail
PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin

cd /var/www/html/rrd

rrd=disk.rrd
if ! test -f $rrd
then
  rrdcreate $rrd \
    DS:droot:DERIVE:600:U:U \
    RRA:AVERAGE:0.5:1:512 RRA:AVERAGE:0.5:12:512 RRA:AVERAGE:0.5:288:512 \
    DS:kroot:GAUGE:600:U:U \
    RRA:AVERAGE:0.5:1:512 RRA:AVERAGE:0.5:12:512 RRA:AVERAGE:0.5:288:512
fi
set -- $(LANG=C df -k --output=used / )
rrdupdate $rrd N:$2:$2

rrdtool graph disk.png \
  -t disk \
  DEF:droot=${rrd}:droot:AVERAGE \
  LINE1:droot#FF0000 \
  > /dev/null

rrdtool graph diskd10.png \
  --end now --start now-864000s \
  -t disk \
  DEF:droot=${rrd}:droot:AVERAGE \
  LINE1:droot#FF0000 \
  > /dev/null

ROOTSIZE=1030825

rrdtool graph diskk.png \
  -t disk \
  DEF:kroot=${rrd}:kroot:AVERAGE \
  CDEF:rroot=kroot,${ROOTSIZE},/ \
  LINE1:rroot#FF0000 \
  > /dev/null

rrdtool graph diskkd10.png \
  --end now --start now-864000s \
  -t disk \
  DEF:kroot=${rrd}:kroot:AVERAGE \
  CDEF:rroot=kroot,${ROOTSIZE},/ \
  LINE1:rroot#FF0000 \
  > /dev/null