Add a script to check the last borg backup

borg_check_last.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# SPDX-License_identifier: BSD-3-Clause
+# Script to check the last known date of the backup and warn if too old
+# Requires jq and yq
+
+set -e
+set -o nounset
+set -o pipefail
+
+mailto="root"
+fromname="yournamehere"
+mailfrom="yournamehere <yourmail>"
+
+max_days=7
+
+last_bak=$(borgmatic list --last 1 --format "{end} {NEWLINE}" --successful --json | \
+           jq '.[].archives | sort_by(.end)[].end | gsub("\\.000000$"; "Z") | fromdate')
+
+repository_name=$(yq '.location.repositories[0]' /etc/borgmatic/config.yaml)
+
+current=$(date +%s)
+difference="$(( current - last_bak ))"
+diff_days="$(( difference / (3600 * 24) ))"
+host_name=$(hostname)
+
+if (( diff_days > max_days ));
+then
+sendmail "$mailto" <<EOF
+From: $mailfrom
+To: $fromname <$mailto>
+Subject:[borgbackup] Warning: backup older than $diff_days days.
+
+Hello,
+
+This is an automated message sent from $host_name.
+
+The backup in $repository_name has not been updated in more than $max_days
+days. It is advisable to check for errors or disabled services.
+
+--
+Automated report system
+
+EOF
+fi