#!/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.

set -e               # exit on error

cd "$(dirname "$0")" # connect to root

docker build -t hadoop-build dev-support/docker

if [ "$(uname -s)" = "Linux" ]; then
  USER_NAME=${SUDO_USER:=$USER}
  USER_ID=$(id -u "${USER_NAME}")
  GROUP_ID=$(id -g "${USER_NAME}")
  # man docker-run
  # When using SELinux, mounted directories may not be accessible
  # to the container. To work around this, with Docker prior to 1.7
  # one needs to run the "chcon -Rt svirt_sandbox_file_t" command on
  # the directories. With Docker 1.7 and later the z mount option
  # does this automatically.
  if command -v selinuxenabled >/dev/null && selinuxenabled; then
    DCKR_VER=$(docker -v|
    awk '$1 == "Docker" && $2 == "version" {split($3,ver,".");print ver[1]"."ver[2]}')
    DCKR_MAJ=${DCKR_VER%.*}
    DCKR_MIN=${DCKR_VER#*.}
    if [ "${DCKR_MAJ}" -eq 1 ] && [ "${DCKR_MIN}" -ge 7 ] ||
        [ "${DCKR_MAJ}" -gt 1 ]; then
      V_OPTS=:z
    else
      for d in "${PWD}" "${HOME}/.m2"; do
        ctx=$(stat --printf='%C' "$d"|cut -d':' -f3)
        if [ "$ctx" != svirt_sandbox_file_t ] && [ "$ctx" != container_file_t ]; then
          printf 'INFO: SELinux is enabled.\n'
          printf '\tMounted %s may not be accessible to the container.\n' "$d"
          printf 'INFO: If so, on the host, run the following command:\n'
          printf '\t# chcon -Rt svirt_sandbox_file_t %s\n' "$d"
        fi
      done
    fi
  fi
else # boot2docker uid and gid
  USER_NAME=$USER
  USER_ID=1000
  GROUP_ID=50
fi

docker build -t "hadoop-build-${USER_ID}" - <<UserSpecificDocker
FROM hadoop-build
RUN groupadd --non-unique -g ${GROUP_ID} ${USER_NAME}
RUN useradd -g ${GROUP_ID} -u ${USER_ID} -k /root -m ${USER_NAME}
RUN echo "${USER_NAME}\tALL=NOPASSWD: ALL" > "/etc/sudoers.d/hadoop-build-${USER_ID}"
ENV HOME /home/${USER_NAME}

UserSpecificDocker

# By mapping the .m2 directory you can do an mvn install from
# within the container and use the result on your normal
# system.  And this also is a significant speedup in subsequent
# builds because the dependencies are downloaded only once.
docker run --rm=true -t -i \
  -v "${PWD}:/home/${USER_NAME}/hadoop${V_OPTS:-}" \
  -w "/home/${USER_NAME}/hadoop" \
  -v "${HOME}/.m2:/home/${USER_NAME}/.m2${V_OPTS:-}" \
  -u "${USER_NAME}" \
  "hadoop-build-${USER_ID}"
