mysql-backup/restore-mysql.sh

#!/usr/bin/env bash

USER="root"
PASSWORD="secretpass"
OUTPUT_DIR="./output"
HOSTNAME="127.0.0.1"
GZIP_ENABLED="1"

USE_PASSWORD="0"
USE_HOSTNAME="0"

set -a # automatically export all variables
source .env
set +a

if [ "${DEBUG}" -gt "0" ]
then
	        set -x
fi

PASSWORD_OPTIONS="-p${PASSWORD}"
HOST_OPTIONS="-h ${HOSTNAME}"

if [ "${USE_HOSTNAME}" -eq "0" ]
then
	HOST_OPTIONS=""
fi

if [ "${USE_PASSWORD}" -eq "0" ]
then
	PASSWORD_OPTIONS=""
fi

databases=$(ls ${OUTPUT_DIR})

for db in ${databases}; do
    if [[ "${db}" != "information_schema" ]] && [[ "${db}" != "performance_schema" ]] && [[ "${db}" != "mysql" ]] && [[ "${db}" != _* ]] 
    then
	GZIP="0"
	DUMP_DIR="${OUTPUT_DIR}/${db}"
	NEWEST_DUMP_FILENAME="$(ls -Art ${OUTPUT_DIR}/${db} | tail -n 1)"
	DUMP_FILENAME="${DUMP_DIR}/${NEWEST_DUMP_FILENAME}"

	file "${DUMP_FILENAME}" | grep "gzip compressed data" >/dev/null
	if [ "$?" -eq "0" ]
	then
		GZIP_ENABLED="1"
	else
		GZIP_ENABLED="0"
	fi
        echo "Restoring database: ${db} from: ${DUMP_FILENAME}"
	echo "Trying to create the DB:"
	mysql ${HOST_OPTIONS} -u ${USER} ${PASSWORD_OPTIONS} --default-character-set=utf8mb4 -e "CREATE DATABASE ${db} CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"

	echo "Restoring DB from backup file"
	if [ "${GZIP_ENABLED}" -gt "0" ]
	then
	        gunzip "${DUMP_FILENAME}" | mysql ${HOST_OPTIONS} -u ${USER} ${PASSWORD_OPTIONS} --default-character-set=utf8mb4 ${db}
 	else
	        cat "${DUMP_FILENAME}" | mysql ${HOST_OPTIONS} -u ${USER} ${PASSWORD_OPTIONS} --default-character-set=utf8mb4 ${db}
	fi
    fi
done

set +x