#!/bin/bash
# Backup script for Calibre-web in a kubernetes cluster

BACKUP_DEST='/mnt/PRIVATE_DOCS/BACKUPS/calibre-web'
DATABASE_FILE='/config/app.db'

# Create filename for database backup
database_backupfile="calibre-web-app_$(date +'%Y%m%d').db"

# Retrieve container name
base_container="$( docker ps --format '{{.Names}}' | grep tkioskje-calibre-web_tkioskje-calibre-web )"

# Abort entire script if any command fails
set -e

# Database backup
>&2 echo 'Backing up database'
docker cp "${base_container}":"${DATABASE_FILE}" "${BACKUP_DEST}/${database_backupfile}"

# Backup cleanup
# Only keep 30 most recent backups
>&2 echo 'Cleaning up old database backups'
pushd "${BACKUP_DEST}"
excess="$( ls -x  | head -n -30 )"
if [ -n "${excess}" ]; then
	>&2 echo "Removing ${excess}"
	rm "${excess}"
else
	>&2 echo 'Skipping: nothing to remove'
fi
popd

>&2 echo 'Done'