---
# Forgejo pg_dump → restic → Hetzner Object Storage (DEV-514).
#
# Replaces the legacy volume-based backup that wrote pg_dump files to
# an RWO PVC (`platform-backup-data`). The hcloud volume backing that
# PVC was deleted externally on 2026-08-17; rather than re-provision
# the same legacy pattern, this migrates to the restic→S3 pipeline
# already used for loki/grafana/prometheus (DEV-485…DEV-492).
#
# initContainer runs pg_dump -F c into an emptyDir; main container
# runs `restic backup --stdin-from-command` isn't used here because
# the dump has to complete before restic starts (need a proper exit
# code, and the custom-format dump is not resumable). Instead we
# stage the dump on emptyDir and let restic dedup it into
# `s3:${S3_ENDPOINT}/${S3_BUCKET}/restic/forgejo`.
apiVersion: batch/v1
kind: CronJob
metadata:
  name: forgejo-backup
  namespace: forgejo
  labels:
    app: forgejo-backup
    backend: restic
spec:
  schedule: "0 3 * * *"
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 3
  jobTemplate:
    metadata:
      labels:
        app: forgejo-backup
        backend: restic
    spec:
      backoffLimit: 2
      activeDeadlineSeconds: 3600
      template:
        metadata:
          labels:
            app: forgejo-backup
            backend: restic
        spec:
          restartPolicy: OnFailure
          initContainers:
            - name: pgdump
              image: postgres:16-alpine
              imagePullPolicy: IfNotPresent
              command:
                - /bin/sh
                - -c
                - |
                  set -eu
                  echo "=== forgejo pg_dump started at $(date -u +%FT%TZ) ==="
                  mkdir -p /dump
                  PGPASSWORD="${POSTGRES_PASSWORD}" pg_dump \
                    -h forgejo-postgres.forgejo.svc.cluster.local \
                    -U "${POSTGRES_USER}" \
                    -d "${POSTGRES_DB}" \
                    -F c \
                    -f /dump/forgejo-db.dump
                  echo "pg_dump size: $(wc -c < /dump/forgejo-db.dump) bytes"
                  # Manifest lets a restic-restore consumer identify the
                  # dump without touching the binary.
                  {
                    echo "backup_timestamp=$(date -u +%Y%m%dT%H%M%SZ)"
                    echo "type=postgresql_custom_dump"
                    echo "database=${POSTGRES_DB}"
                    echo "restore_cmd=PGPASSWORD=<pass> pg_restore -h <host> -U ${POSTGRES_USER} -d ${POSTGRES_DB} -F c forgejo-db.dump"
                  } > /dump/manifest.txt
                  echo "=== forgejo pg_dump finished at $(date -u +%FT%TZ) ==="
              env:
                - name: POSTGRES_USER
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-postgres-secret
                      key: POSTGRES_USER
                - name: POSTGRES_PASSWORD
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-postgres-secret
                      key: POSTGRES_PASSWORD
                - name: POSTGRES_DB
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-postgres-secret
                      key: POSTGRES_DB
              volumeMounts:
                - name: dump
                  mountPath: /dump
              resources:
                requests:
                  cpu: 100m
                  memory: 128Mi
                limits:
                  cpu: 1000m
                  memory: 512Mi
          containers:
            - name: restic
              image: harbor.basicstack.de/library/restic:0.19.1
              env:
                - name: AWS_ACCESS_KEY_ID
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-s3-backup
                      key: access-key
                - name: AWS_SECRET_ACCESS_KEY
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-s3-backup
                      key: secret-key
                - name: RESTIC_PASSWORD
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-s3-backup
                      key: restic-password
                - name: S3_ENDPOINT
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-s3-backup
                      key: endpoint
                - name: S3_BUCKET
                  valueFrom:
                    secretKeyRef:
                      name: forgejo-s3-backup
                      key: bucket
                - name: RESTIC_REPOSITORY
                  value: "s3:$(S3_ENDPOINT)/$(S3_BUCKET)/restic/forgejo"
              command:
                - /bin/sh
                - -c
                - |
                  set -eu
                  echo "=== backup-forgejo-restic started at $(date -u +%FT%TZ) ==="
                  echo "Repository: ${RESTIC_REPOSITORY}"

                  if restic snapshots >/dev/null 2>&1; then
                    echo "Repo exists, skipping init."
                  else
                    echo "Repo missing, initialising..."
                    restic init
                  fi

                  echo "--- restic backup /source ---"
                  restic backup /source \
                    --tag forgejo \
                    --host k3s

                  echo "--- restic forget/prune ---"
                  restic forget --tag forgejo \
                    --keep-daily 7 \
                    --keep-weekly 4 \
                    --keep-monthly 6 \
                    --prune

                  echo "--- restic check --read-data-subset=5% ---"
                  CHECK_STATUS=0
                  restic check --read-data-subset=5% || CHECK_STATUS=$?
                  echo "restic check exit: ${CHECK_STATUS}"

                  echo "--- restic stats (repo size) ---"
                  REPO_SIZE_BYTES=$(restic stats --json --mode raw-data 2>/dev/null \
                    | grep -oE '"total_size":[0-9]+' \
                    | head -1 \
                    | cut -d: -f2)
                  REPO_SIZE_BYTES=${REPO_SIZE_BYTES:-0}
                  echo "restic repo size: ${REPO_SIZE_BYTES} bytes"

                  # Textfile-collector metrics, same wiring as
                  # loki/grafana siblings (DEV-494). Atomic write.
                  {
                    echo "backup_forgejo_success $([ ${CHECK_STATUS} -eq 0 ] && echo 1 || echo 0)"
                    echo "backup_forgejo_timestamp_seconds $(date +%s)"
                    echo "backup_forgejo_check_status ${CHECK_STATUS}"
                    echo "restic_repo_size_bytes{repo=\"forgejo\"} ${REPO_SIZE_BYTES}"
                  } > /metrics/backup_forgejo.prom.tmp
                  mv /metrics/backup_forgejo.prom.tmp /metrics/backup_forgejo.prom

                  echo "=== backup-forgejo-restic finished at $(date -u +%FT%TZ) ==="
                  exit ${CHECK_STATUS}
              volumeMounts:
                - name: dump
                  mountPath: /source
                  readOnly: true
                - name: metrics
                  mountPath: /metrics
                - name: cache
                  mountPath: /root/.cache/restic
              resources:
                requests:
                  cpu: 100m
                  memory: 128Mi
                limits:
                  cpu: 1500m
                  memory: 1Gi
          volumes:
            - name: dump
              emptyDir:
                sizeLimit: 5Gi
            - name: metrics
              hostPath:
                path: /var/lib/node_exporter/textfile_collector
                type: DirectoryOrCreate
            - name: cache
              emptyDir: {}