mvn

#!/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.
#

# Determine the current working directory
_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
# Preserve the calling directory
_CALLING_DIR="$(pwd)"
# Options used during compilation
_COMPILE_JVM_OPTS="-Xms2g -Xmx2g -XX:ReservedCodeCacheSize=1g -Xss128m"

if [ "$CI" ]; then
  export MAVEN_CLI_OPTS="--no-transfer-progress --errors --fail-fast"
fi

# Installs any application tarball given a URL, the expected tarball name,
# and, optionally, a checkable binary path to determine if the binary has
# already been installed
## Arg1 - URL
## Arg2 - Tarball Name
## Arg3 - Checkable Binary
install_app() {
  local remote_tarball="$1/$2$4"
  local local_tarball="${_DIR}/$2"
  local binary="${_DIR}/$3"

  # setup `curl` and `wget` silent options if we're running on Jenkins
  local curl_opts="-L"
  local wget_opts=""
  curl_opts="--progress-bar ${curl_opts}"
  wget_opts="--progress=bar:force ${wget_opts}"

  if [ -z "$3" -o ! -f "$binary" ]; then
    # check if we already have the tarball
    # check if we have curl installed
    # download application
    [ ! -f "${local_tarball}" ] && [ $(command -v curl) ] && \
      echo "exec: curl ${curl_opts} ${remote_tarball}" 1>&2 && \
      curl ${curl_opts} "${remote_tarball}" > "${local_tarball}"
    # if the file still doesn't exist, lets try `wget` and cross our fingers
    [ ! -f "${local_tarball}" ] && [ $(command -v wget) ] && \
      echo "exec: wget ${wget_opts} ${remote_tarball}" 1>&2 && \
      wget ${wget_opts} -O "${local_tarball}" "${remote_tarball}"
    # if both were unsuccessful, exit
    [ ! -f "${local_tarball}" ] && \
      echo -n "ERROR: Cannot download $2 with cURL or wget; " && \
      echo "please install manually and try again." && \
      exit 2
    cd "${_DIR}" && tar -xzf "$2"
    rm -rf "$local_tarball"
  fi
}

# Determine the Maven version from the root pom.xml file and
# install maven under the build/ folder if needed.
install_mvn() {
  local MVN_VERSION=`grep "<maven.version>" "${_DIR}/../pom.xml" | head -n1 | awk -F '[<>]' '{print $3}'`
  MVN_BIN="$(command -v mvn)"
  if [ "$MVN_BIN" ]; then
    local MVN_DETECTED_VERSION="$(mvn --version | head -n1 | awk '{print $3}')"
  fi
  # See simple version normalization: http://stackoverflow.com/questions/16989598/bash-comparing-version-numbers
  function version { echo "$@" | awk -F. '{ printf("%03d%03d%03d\n", $1,$2,$3); }'; }
  if [ $(version $MVN_DETECTED_VERSION) -ne $(version $MVN_VERSION) ]; then
    local APACHE_MIRROR=${APACHE_MIRROR:-'https://www.apache.org/dyn/closer.lua'}
    local MIRROR_URL_QUERY="?action=download"
    local MVN_TARBALL="apache-maven-${MVN_VERSION}-bin.tar.gz"
    local FILE_PATH="maven/maven-3/${MVN_VERSION}/binaries"

    if [ $(command -v curl) ]; then
      if ! curl -L --output /dev/null --silent --head --fail "${APACHE_MIRROR}/${FILE_PATH}/${MVN_TARBALL}${MIRROR_URL_QUERY}" ; then
        # Fall back to archive.apache.org for older Maven
        echo "Falling back to archive.apache.org to download Maven"
        APACHE_MIRROR="https://archive.apache.org/dist"
        MIRROR_URL_QUERY=""
      fi
    fi

    install_app \
      "${APACHE_MIRROR}/${FILE_PATH}" \
      "${MVN_TARBALL}" \
      "apache-maven-${MVN_VERSION}/bin/mvn" \
      "${MIRROR_URL_QUERY}"

    MVN_BIN="${_DIR}/apache-maven-${MVN_VERSION}/bin/mvn"
  fi
}

install_mvn

cd "${_CALLING_DIR}"

# Set any `mvn` options if not already present
export MAVEN_OPTS=${MAVEN_OPTS:-"$_COMPILE_JVM_OPTS"}

echo "Using \`mvn\` from path: $MVN_BIN" 1>&2
${MVN_BIN} $MAVEN_CLI_OPTS "$@"