#!/bin/bash
#
# This is an entrypoint that runs the MySQL server in the 'slave' mode.
#

export_vars=$(cgroup-limits); export $export_vars
source ${CONTAINER_SCRIPTS_PATH}/common.sh
set -eu
if [[ -v DEBUG_IGNORE_SCRIPT_FAILURES ]]; then
  set +e
fi

export_setting_variables

log_volume_info $MYSQL_DATADIR

export MYSQL_RUNNING_AS_SLAVE=1

# Generate the unique 'server-id' for this master
export MYSQL_SERVER_ID=$(server_id)
log_info "The 'slave' server-id is ${MYSQL_SERVER_ID}"

# pre-init files
process_extending_files ${APP_DATA}/mysql-pre-init/ ${CONTAINER_SCRIPTS_PATH}/pre-init/

if [ ! -e "${MYSQL_DATADIR}/mysql" ]; then
  # Initialize MySQL database and wait for the MySQL master to accept
  # connections.
  initialize_database "$@"
  wait_for_mysql_master

  # Get binlog file and position from master
  STATUS_INFO=$(mysql --host "$MYSQL_MASTER_SERVICE_NAME" "-u${MYSQL_MASTER_USER}" "-p${MYSQL_MASTER_PASSWORD}" replication -e 'SELECT gtid from replication limit 1\G')
  GTID_VALUE=$(echo "$STATUS_INFO" | grep 'gtid:' | head -n 1 | sed -e 's/^\s*gtid: //')

  # checking STATUS_INFO here because empty GTID_VALUE is valid value
  if [ -z "${STATUS_INFO}" ] ; then
    echo "Could not read GTID value from master"
    exit 1
  fi

  mysql $mysql_flags <<EOSQL
  STOP SLAVE;
  SET GLOBAL gtid_slave_pos = "${GTID_VALUE}";
  CHANGE MASTER TO MASTER_HOST='${MYSQL_MASTER_SERVICE_NAME}',MASTER_USER='${MYSQL_MASTER_USER}', MASTER_PASSWORD='${MYSQL_MASTER_PASSWORD}', MASTER_USE_GTID=slave_pos;
  START SLAVE;
EOSQL

  # init files
  process_extending_files ${APP_DATA}/mysql-init/ ${CONTAINER_SCRIPTS_PATH}/init/

  # Restart the MySQL server with public IP bindings
  shutdown_local_mysql
fi

unset_env_vars
log_volume_info $MYSQL_DATADIR
log_info 'Running final exec -- Only MySQL server logs after this point'
exec ${MYSQL_PREFIX}/libexec/mysqld --defaults-file=$MYSQL_DEFAULTS_FILE \
  --report-host=$(hostname -I) "$@" 2>&1