anchor.diff:  
   
   # explicitly set user/group IDs
  -RUN addgroup -S "${MARIADB_USER}" -g 9999 && adduser -S -G "${MARIADB_USER}" -u 9999 "${MARIADB_USER}"
  +RUN addgroup -S "${MARIADB_GROUP}" -g 9999 && adduser -S -G "${MARIADB_GROUP}" -u 9999 "${MARIADB_USER}"
   
   RUN \
     set -ex; \
  
positive.code: 
  ENV \
    MARIADB_USER=mysql \
    MARIADB_BASE_DIR=/usr \
    MARIADB_DATA_DIR=/var/lib/mysql \
    MARIADB_RUN_DIR=/run/mysqld \
  
negative.code: 
  RUN \
    chmod 644 /etc/mysql/my.cnf && \
    chown "${MARIADB_USER}":"${MARIADB_GROUP}" /etc/mysql/my.cnf && \
    chmod 644 /etc/mysql/mysqld_charset.cnf && \
    chown "${MARIADB_USER}":"${MARIADB_GROUP}" /etc/mysql/mysqld_charset.cnf && \
    chmod 755 docker-entrypoint.sh
  
  EXPOSE 3306
  