backup.sh

#!/bin/bash

set -e

. /etc/environment
DIR=$(mktemp -d)
TS=$(date +$TS_FORMAT)

if [ -z "$DBS" ]
then
	mysqldump -u$MYSQL_USERNAME -p$MYSQL_PASSWORD -h$MYSQL_HOST --all-databases | gzip > $DIR/all-databases-$TS.sql.gz
else
	for DB in $DBS
	do
		mysqldump -u$MYSQL_USERNAME -p$MYSQL_PASSWORD -h$MYSQL_HOST $DB | gzip > $DIR/$DB-$TS.sql.gz
	done
fi

COMMAND=${RSYNC_COMMAND//%DIR%/$DIR}

eval $( echo $COMMAND )

# Clean up
rm -rf $DIR

send_notification()
{
  NOTIFICATION_CONTENT="container-mysql-backup ${HOSTNAME} ${DIR}/{$DB}-{$TS}.sql.gz"
  if [ ! -z "${NOTIFICATION_SERVICE}" ]; then
    if [ "${NOTIFICATION_SERVICE}" = "slack" ]; then
      curl -X POST -H 'Content-type: application/json' --data "{\"text\": \"${NOTIFICATION_CONTENT}\", \"channel\": \"${SLACK_CHANNEL}\", \"username\": \"${SLACK_USERNAME}\", \"icon_emoji\": \":${SLACK_EMOJI}:\"}" "${SLACK_HOOK_URL}"
      echo -e "Slack notification sent to channel ${SLACK_CHANNEL}"
    fi
  fi
}

send_notification