#!/bin/bash

used=`df /export | tail -n1 | awk '{print $3}'`
md_dev=`df /export | tail -n1 | awk '{print $1}'`
free=`df /export | tail -n1 | awk '{print $4}'`
total=`echo "$used + $free" | bc` 

tmp_file=/tmp/directory_size.prom.$$
real_file=/srv/docker/container/node-exporter/textfile_collector/directory_size.prom

echo "# HELP node_filesystem_avail_bytes Filesystem space available to non-root users in bytes." > $tmp_file
echo "# TYPE node_filesystem_avail_bytes gauge" >> $tmp_file

echo "# HELP node_filesystem_size_bytes Filesystem size in bytes." >> $tmp_file
echo "# TYPE node_filesystem_size_bytes gauge" >> $tmp_file

echo "node_filesystem_avail_bytes{device=\"$md_dev\",fstype=\"ext4\",mountpoint=\"/export\"} $free" >> $tmp_file
echo "node_filesystem_size_bytes{device=\"$md_dev\",fstype=\"ext4\",mountpoint=\"/export\"} $total" >> $tmp_file

used=`df / | tail -n1 | awk '{print $3}'`
root_dev=`df / | tail -n1 | awk '{print $1}'`
free=`df / | tail -n1 | awk '{print $4}'`
total=`echo "$used + $free" | bc` 

echo "node_filesystem_avail_bytes{device=\"$root_dev\",fstype=\"ext4\",mountpoint=\"/\"} $free" >> $tmp_file
echo "node_filesystem_size_bytes{device=\"$root_dev\",fstype=\"ext4\",mountpoint=\"/\"} $total" >> $tmp_file
mv $tmp_file $real_file