#! /bin/sh

#
# MySQL Backup
# Do backup of one or all databases of a given MySQL server
#

#
# List Databases
#

# only argument is a database url
DB_URL="$1";

# load database values as environment variables while checking URL validity
dburl-parser.sh ${DB_URL} > /tmp/ofelia.dotenv;
source /tmp/ofelia.dotenv;
rm /tmp/ofelia.dotenv;

# set backup destination
## directory path
BACKUP_DATABASES_PATH=${BACKUP_DATABASES_PATH:-/var/data/backup-databases};
mkdir -p ${BACKUP_DATABASES_PATH};
## file name
BACKUP_DATABASES_PREFIX="backup-";
BACKUP_DATABASES_SUFFIX="SQL";

if test "${DB_NAME}" = '*'; then
    databases=$(mysql\
        --user=${DB_USERNAME}\
        --password=${DB_PASSWORD}\
        --host="${DB_HOST}"\
        --execute="SHOW DATABASES;"\
        --vertical\
        --column-names=false\
        | grep -ve ^\*\
        | xargs
    );
else
    databases="${DB_NAME:-:ALL_DATABASES:}";
fi

for database_item in ${databases}; do
    if test -z "${database_item}"; then
        continue;
    elif test "${database_item}" = ":ALL_DATABASES:"; then
        database="--all-databases";
        filename_database="all-databases";
    else
        database="--databases ${database_item}";
        filename_database="${database_item}";
    fi
    cat | xargs mysqldump << HEREDOC
$(test -n ${DB_USERNAME} && echo "--user=${DB_USERNAME}")
$(test -n ${DB_PASSWORD} && echo "--password=${DB_PASSWORD}")
$(test -n ${DB_HOST} && echo "--host=${DB_HOST}")
$(test -n ${DB_PORT} && echo "--port=${DB_PORT}")
--result-file=$(
    printf '%s/%s%s-%s_%s.%s'\
    ${BACKUP_DATABASES_PATH}\
    ${BACKUP_DATABASES_PREFIX}\
    ${DB_HOST}\
    ${filename_database}\
    $(date +%s)\
    ${BACKUP_DATABASES_SUFFIX}
)
${database}
HEREDOC
done