enable_backups.sh

#!/bin/bash

BACKUP_LOG="/var/log/postgresql/backup.log"
touch $BACKUP_LOG

if [ -n "${CRON_TIME}" ]; then
    echo "=> Configuring cron schedule for database backups ..."

    PG_HOST=${POSTGRES_PORT_5432_TCP_ADDR:-${PG_HOST}}
    PG_PORT=${POSTGRES_PORT_5432_TCP_PORT:-${PG_PORT}}
    PG_USER=${PG_USER:-${PG_ENV_PG_USER}}
    PG_PASS=${PG_PASS:-${PG_ENV_PG_PASS}}

    [ -z "${PG_HOST}" ] && { echo "=> PG_HOST cannot be empty" && exit 1; }
    [ -z "${PG_PORT}" ] && { echo "=> PG_PORT cannot be empty" && exit 1; }
    [ -z "${PG_USER}" ] && { echo "=> PG_USER cannot be empty" && exit 1; }
    [ -z "${PG_PASS}" ] && { echo "=> PG_PASS cannot be empty" && exit 1; }
    [ -z "${PG_DB}" ] && { echo "=> PG_DB cannot be empty" && exit 1; }
    [ -z "${S3_BUCKET}" ] && { echo "=> S3_BUCKET cannot be empty" && exit 1; }
    [ -z "${AWS_ACCESS_KEY_ID}" ] && { echo "=> AWS_ACCESS_KEY_ID cannot be empty" && exit 1; }
    [ -z "${AWS_SECRET_ACCESS_KEY}" ] && { echo "=> AWS_SECRET_ACCESS_KEY cannot be empty" && exit 1; }
    [ -z "${AWS_DEFAULT_REGION}" ] && { echo "=> AWS_DEFAULT_REGION cannot be empty" && exit 1; }

    # Set environment variables to run cron job
    echo "AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID}" >> /etc/cron.d/postgres_backup
    echo "AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}" >> /etc/cron.d/postgres_backup
    echo "AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION}" >> /etc/cron.d/postgres_backup
    echo "PG_HOST=${PG_HOST}" >> /etc/cron.d/postgres_backup
    echo "PG_PORT=${PG_PORT}" >> /etc/cron.d/postgres_backup
    echo "PG_USER=${PG_USER}" >> /etc/cron.d/postgres_backup
    echo "PG_PASS=${PG_PASS}" >> /etc/cron.d/postgres_backup
    echo "PG_DB=${PG_DB}" >> /etc/cron.d/postgres_backup
    echo "S3_BUCKET=${S3_BUCKET}" >> /etc/cron.d/postgres_backup
    echo "${CRON_TIME} /backup.sh >> ${BACKUP_LOG} 2>&1" >> /etc/cron.d/postgres_backup

    # start cron if it's not running
    if [ ! -f /var/run/crond.pid ]; then
        exec /usr/sbin/cron -f &
    fi

    echo "=> Cron schedule set to ${CRON_TIME}. Tailing logs ..."

    tail -f $BACKUP_LOG
else
    echo "=> Backups not scheduled. No CRON_TIME found."
fi