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#!/bin/sh
set -eu
mountpoint="/"
warning=20
critical=10
error() {
jq -cn --arg message "$1" '{
text: "N/A",
percentage: 0,
tooltip: $message,
class: "critical"
}'
exit 0
}
line=$(df -hP -l "$mountpoint" 2>/dev/null | tail -n 1) ||
error "Unable to read filesystem statistics"
# df -P guarantees a single line per filesystem.
set -- $line
[ "$#" -ge 6 ] || error "Unable to parse filesystem statistics"
filesystem=$1
size=$2
used=$3
available=$4
use=${5%\%}
mounted=$6
case "$use" in
''|*[!0-9]*) error "Invalid filesystem usage percentage: $use%" ;;
esac
free=$((100 - use))
if [ "$free" -le "$critical" ]; then
class="critical"
elif [ "$free" -le "$warning" ]; then
class="warning"
else
class=""
fi
jq -cn \
--arg text "${use}%" \
--argjson percentage "$use" \
--arg filesystem "$filesystem" \
--arg size "$size" \
--arg used "$used" \
--arg available "$available" \
--arg mounted "$mounted" \
--arg class "$class" \
'{
text: $text,
percentage: $percentage,
tooltip: (
"Filesystem: " + $filesystem +
"\rSize: " + $size +
"\rUsed: " + $used +
"\rAvail: " + $available +
"\rUse%: " + $text +
"\rMounted on: " + $mounted
),
class: $class
}'
|
