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#!/usr/bin/env bash
set -euo pipefail
sizeWarn=''
sizeCrit=''
timeWarn=''
timeCrit=''
bucket=''
key=''
usage() {
cat <<USAGE
$0: check objects size and time at Amazon S3
Usage:
$0 [options]
Options:
-f <path> AWS CLI credentials file
-b <bucket> S3 bucket name, required
-k <key> object key, e. g. "hosts/foo/bar.gz"
-s <spec in bytes> object size warning threshold
-S <spec in bytes> object size critical threshold
-t <spec in sec> object age warning threshold
-T <spec in sec> object age critical threshold
Examples:
$0 -b foobucket # check the bucket is available
$0 -b foobucket -k hosts/foo/file.gz
$0 -b foobucket -k hosts/foo/file.gz -t 86400
$0 -b foobucket -k hosts/foo/file.gz -t 3600: -s 1000:
USAGE
}
die () {
echo "$0: " "$@" >&2
exit 1
}
while [ $# -gt 0 ]; do
case "$1" in
-f) export AWS_SHARED_CREDENTIALS_FILE="$2"; shift 2;;
-b) bucket="$2"; shift 2;;
-k) key="$2"; shift 2;;
-s) sizeWarn="$2"; shift 2;;
-S) sizeCrit="$2"; shift 2;;
-t) timeWarn="$2"; shift 2;;
-T) timeCrit="$2"; shift 2;;
-h|--help) usage; exit 1;;
*) die "unsupported argument: $1";;
esac
done
inrange () {
local r v
local v1 v2
local outter
local sIFS
r="$1"
v="$2"
case "$r" in
@*) outter=true; r="${r/@/}";;
*) outter=false;;
esac
sIFS=$IFS
IFS=:
set -- $r
v1=${1-}
v2=${2-}
IFS=$sIFS
case "$v1" in
$r) v2=$v1; v1=0;;
~*) v1=;;
esac
if $outter; then
{ [ -n "$v1" ] && [ "$v" -le "$v1" ]; } || { [ -n "$v2" ] && [ "$v" -ge "$v2" ]; }
else
{ [ -z "$v1" ] || [ "$v" -ge "$v1" ]; } && { [ -z "$v2" ] || [ "$v" -le "$v2" ]; }
fi
}
humanSize() {
local n u
n=$1
for u in B KiB MiB GiB TiB; do
if (( n > 1024 )); then
(( n /= 1024 ))
else
break
fi
done
echo "${n} ${u}"
}
[ -n "$bucket" ] || die "missing S3 bucket"
if [ -z "$key" ]; then
if out=$(aws s3api head-bucket --bucket "$bucket" 2>&1); then
echo "OK: bucket $bucket exists and is accessible"
exit 0
else
printf 'CRITICAL: %s\n' "$(echo "$out" | grep .)"
exit 2
fi
fi
if ! out=$(aws s3api head-object --bucket "$bucket" --key "$key" 2>&1); then
printf 'UNKNOWN: %s\n' "$(echo "$out" | grep .)"
exit 3
fi
json=$out
size=$(echo "$json" | jq -r .ContentLength)
date=$(echo "$json" | jq -r .LastModified)
date_s=$(date -d "$date" +%s)
now_s=$(date -d now +%s)
age_s=$((now_s - date_s))
size_h=$(humanSize "$size")
stat="size=${size}B;${sizeWarn};${sizeCrit};0 age=${age_s}s;${timeWarn};${timeCrit}"
if [ -n "$timeCrit" ] && ! inrange "$timeCrit" "$age_s"; then
echo "CRITICAL: last modified $date|$stat"
exit 2
fi
if [ -n "$sizeCrit" ] && ! inrange "$sizeCrit" "$size"; then
echo "CRITICAL: size $size_h|$stat"
exit 2
fi
if [ -n "$timeWarn" ] && ! inrange "$timeWarn" "$age_s"; then
echo "WARNING: last modified $date|$stat"
exit 1
fi
if [ -n "$sizeWarn" ] && ! inrange "$sizeWarn" "$size"; then
echo "WARNING: size $size_h|$stat"
exit 1
fi
echo "OK: size $size_h, last modified $date|$stat"
exit 0
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