run-backups

#!/bin/bash
source /etc/b2-backup/local.conf
CONF_DIR=${CONF_DIR:-/etc/b2-backup}
STATE_DIR=${STATE_DIR:-/var/lib/b2-backup}
LOG_DIR=${LOG_DIR:-/var/log/b2-backup}
PROM_EXPORTER_DIR=${PROM_EXPORTER_DIR:-/var/lib/prometheus/node-exporter}

host=$(hostname -s)

echo "Launching backups in background (parallel):"
let count=0
while read path name; do
	/usr/sbin/do-backup "${path}" "${name}" "$$" &>"${LOG_DIR}/${backup}.execlog" &
	echo "+ ${name}"
	let count=count+1
done < "${CONF_DIR}/backups"

echo -n "Waiting for backup jobs to complete... "
wait
echo "Done."

prom=$(mktemp)
echo "# HELP b2_backup_timestamp Timestamp that B2 Backup last reported data">$prom
echo "# TYPE b2_backup_timestamp gauge">>$prom
echo "b2_backup_timestamp $(date +%s)">>$prom

echo "# HELP b2_backup_status B2 Backup status by name">>$prom
echo "# TYPE b2_backup_status gauge">>$prom

email=$(mktemp)
echo "SUMMARY:" >$email

echo "Backup Results:"
let ok=0
while read path name; do
	backup="${host}-${name}"
	status=$(cat "${LOG_DIR}/${backup}.success" 2>/dev/null)
	if [ "$status" == "$$" ]; then
		echo "- ${name} SUCCEEDED" | tee -a $email
		let ok=ok+1
		echo "b2_backup_status{backup=\"${name}\"} 1">>$prom
	else
		echo "- ${name} FAILED (check logs)" | tee -a $email
		echo "b2_backup_status{backup=\"${name}\"} 0">>$prom
	fi
done < "${CONF_DIR}/backups"

if [ -w "${PROM_EXPORTER_DIR}" ]; then
	cp "${prom}" "${PROM_EXPORTER_DIR}"/b2_backup.prom
	chmod 644 "${PROM_EXPORTER_DIR}"/b2_backup.prom
fi
rm -f $prom

while read path name; do
  backup="${host}-${name}"
  echo -e "\n\n" >>$email
  echo "== $name ($path) ==" >>$email
  status=$(cat "${LOG_DIR}/${backup}.success" 2>/dev/null)
  if [ "$status" != "$$" ]; then
		latest=$(find "${LOG_DIR}" \
			-regextype grep \
		 	-regex ".*${backup}-[[:digit:]]\{8\}-[[:digit:]]\{6\}$" |
			sort | tail -n1)
		if [ -e "$latest" ]; then
			echo -e "Last 10 lines of $latest ...\n" >>$email
			tail -n 10 $latest >>$email
			echo -e "\n--\n" >>$email
		fi
	fi
	cat "${LOG_DIR}/${backup}.status" >>$email
done  < "${CONF_DIR}/backups"

if [ ! -z "$BACKUP_EMAIL_TO" ]; then
	mail -s "Backup Status ($host): $ok/$count succeeded" \
		$BACKUP_EMAIL_TO <$email
fi
rm -f $email

# Clean-up logs
find "${LOG_DIR}" \
 -regextype grep \
 -regex '.*[[:digit:]]\{8\}-[[:digit:]]\{6\}$' \
 -type f \
 -mtime +1 \
 -execdir gzip '{}' \;
find "${LOG_DIR}" \
 -type f \
 -not -name *-status \
 -mtime +62 \
 -delete