#!/bin/bash

# MySQL backup/restore hook for the `db` service. Invoked by backupbot-two via:
#   backupbot.backup.pre-hook   = "/mysql_backup.sh backup"
#   backupbot.backup.path       = "/var/lib/mysql/backup.sql.gz"
#   backupbot.restore.post-hook = "/mysql_backup.sh restore"
# Backup dumps the `ghost` DB to a single gzipped file inside the mysql data volume; backupbot
# archives it. Restore reimports it. The previous recipe shipped a `mysqldump --tab` backup with NO
# restore hook (and the mysql data volume itself was not backed up), so a restored backup silently
# kept the live, un-restored DB state — data loss on restore.

set -e

BACKUP_FILE="/var/lib/mysql/backup.sql.gz"
export MYSQL_PWD="$(cat "${MYSQL_ROOT_PASSWORD_FILE:-/run/secrets/db_password}")"
DB_NAME="ghost"

function backup {
  mysqldump -u root --single-transaction --routines --triggers --databases "$DB_NAME" | gzip > "$BACKUP_FILE"
}

function restore {
  # --databases dump carries CREATE DATABASE/USE + per-table DROP+CREATE (mysqldump default), so the
  # reimport deterministically rebuilds every table from the archived dump.
  gunzip -c "$BACKUP_FILE" | mysql -u root
}

$@