#!/bin/sh
set -eu

if [ "$#" -ne 1 ]; then
  echo "Usage: $0 ABSOLUTE_BACKUP_DIRECTORY" >&2
  exit 2
fi

case "$1" in
  /*) ;;
  *) echo "Backup directory must be an absolute path" >&2; exit 2 ;;
esac

backup_root=${1%/}
stamp=$(date -u +%Y%m%dT%H%M%SZ)
target="$backup_root/$stamp"
mkdir -p "$target"
chmod 700 "$target"
export BACKUP_DIRECTORY="$backup_root"

compose="docker compose --env-file .env.production -f compose.production.yaml"
$compose exec -T db sh -c 'pg_dump --format=custom --no-owner --no-acl -U "$POSTGRES_USER" -d "$POSTGRES_DB"' > "$target/postgres.dump"
$compose run --rm storage-tool tar -czf "/backup/$stamp/minio.tar.gz" -C /data .
sha256sum "$target/postgres.dump" "$target/minio.tar.gz" > "$target/SHA256SUMS"
chmod 600 "$target/postgres.dump" "$target/minio.tar.gz" "$target/SHA256SUMS"
echo "Backup created: $target"