#!/usr/bin/env bash
# ----------------------------------------------------------------------------
# forgejo-backup.sh — dump the live Forgejo instance and copy the archive to
# the host. Run on the VPS via forgejo-backup.timer (see this dir).
#
# `forgejo dump` produces a single archive of the database, repositories,
# config, and the data dir (attachments + the container registry blobs). It is
# safe to run against a live instance.
#
# Install:
#   sudo install -m 0755 forgejo-backup.sh /usr/local/bin/forgejo-backup.sh
# ----------------------------------------------------------------------------
set -euo pipefail

CONTAINER=forgejo
BACKUP_DIR=/opt/backups/forgejo
RETAIN_DAYS=14
STAMP="$(date +%Y%m%d-%H%M%S)"
NAME="forgejo-${STAMP}.tar.zst"

mkdir -p "$BACKUP_DIR"

# Dump as the git user inside the container (writes to /tmp), then copy out.
# Add --skip-package to exclude the registry blobs if dumps get too large
# (they grow with per-commit :sha image tags — see registry GC in the README).
docker exec -u git "$CONTAINER" \
  forgejo dump --type tar.zst --skip-log --file "/tmp/${NAME}"
docker cp "${CONTAINER}:/tmp/${NAME}" "${BACKUP_DIR}/${NAME}"
docker exec "$CONTAINER" rm -f "/tmp/${NAME}"

# Retention: drop dumps older than RETAIN_DAYS.
find "$BACKUP_DIR" -maxdepth 1 -name 'forgejo-*.tar.zst' -mtime +"${RETAIN_DAYS}" -delete

echo "Backup written: ${BACKUP_DIR}/${NAME}"