#!/usr/bin/env bash

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Run as root to start secure datanodes in a security-enabled cluster.


function hadoop_usage {
  echo "Usage: start-secure-dns.sh"
}

this="${BASH_SOURCE-$0}"
bin=$(cd -P -- "$(dirname -- "${this}")" >/dev/null && pwd -P)

# let's locate libexec...
if [[ -n "${HADOOP_PREFIX}" ]]; then
  HADOOP_DEFAULT_LIBEXEC_DIR="${HADOOP_PREFIX}/libexec"
else
  HADOOP_DEFAULT_LIBEXEC_DIR="${bin}/../libexec"
fi

HADOOP_LIBEXEC_DIR="${HADOOP_LIBEXEC_DIR:-$HADOOP_DEFAULT_LIBEXEC_DIR}"
# shellcheck disable=SC2034
HADOOP_NEW_CONFIG=true
if [[ -f "${HADOOP_LIBEXEC_DIR}/hdfs-config.sh" ]]; then
  . "${HADOOP_LIBEXEC_DIR}/hdfs-config.sh"
else
  echo "ERROR: Cannot execute ${HADOOP_LIBEXEC_DIR}/hdfs-config.sh." 2>&1
  exit 1
fi

if [[ "${EUID}" -eq 0 ]] && [[ -n "${HADOOP_SECURE_DN_USER}" ]]; then
  exec "${HADOOP_HDFS_HOME}/bin/hdfs" \
     --config "${HADOOP_CONF_DIR}" \
     --slaves \
     --daemon start \
     datanode
else
  echo hadoop_usage_and_exit 1
fi