#!/usr/bin/env bash

export BACKUP_FREQUENCY=${BACKUP_FREQUENCY:-3h}
export BACKUPS_TO_RETAIN=${BACKUPS_TO_RETAIN:-5}

while true; do
    sleep "$BACKUP_FREQUENCY"
    echo "database: performing a backup..."
    if [[ -f /var/lib/postgresql/9.3/main/recovery.conf ]] ; then
        echo "database: database is currently recovering from a backup. Will try again next loop..."
    else
        # perform a backup
        envdir /etc/wal-e.d/env wal-e backup-push /var/lib/postgresql/9.3/main
        # only retain the latest BACKUPS_TO_RETAIN backups
        envdir /etc/wal-e.d/env wal-e delete --confirm retain "$BACKUPS_TO_RETAIN"
        echo "database: backup has been completed."
    fi
done