#!/bin/sh -e

BACKUP_PATH=${BACKUP_PATH:-$1}
INSTANCE="$(echo ${INSTANCE:-${TAG}} | envsubst)"
KEEP_ARGS=${KEEP_ARGS:-"--keep-hourly 12 --keep-daily 7 --keep-monthly 3"}
export RESTIC_REPOSITORY="$(echo ${RESTIC_REPOSITORY} | envsubst)"

echo -n > /tmp/metrics
ts_start=$(date +%s)

ts=$(date +%s)
restic cat config >/dev/null || restic init
echo "restic_init_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics

ts=$(date +%s)
restic backup --verbose --tag ${TAG} ${BACKUP_PATH}
echo "restic_backup_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics

ts=$(date +%s)
restic forget --prune --tag ${TAG} -g paths,tags ${KEEP_ARGS}
echo "restic_forget_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics


# Metrics
ts=$(date +%s)
restic stats --json latest > /tmp/stats.json
restic snapshots --json latest > /tmp/snapshots.json
echo "restic_stats_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics

echo "restic_total_duration $(echo "$(date +%s) - $ts_start" | bc)" >> /tmp/metrics

cat /tmp/stats.json | jq -r '"restic_stats_total_size_bytes \(.total_size)\nrestic_stats_total_file_count \(.total_file_count)"' >> /tmp/metrics
cat /tmp/snapshots.json | jq -r 'max_by(.time) | .time | sub(".[0-9]+Z$"; "Z") | fromdate | "restic_stats_last_snapshot_timestamp \(.)"' >> /tmp/metrics
cat /tmp/metrics | curl --data-binary @- "http://prometheus-pushgateway.monitoring.svc.cluster.local:9091/metrics/job/backup/instance/${INSTANCE}"