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#!/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.
#


acquire_rat_jar () {

  URL1="http://search.maven.org/remotecontent?filepath=org/apache/rat/apache-rat/${RAT_VERSION}/apache-rat-${RAT_VERSION}.jar"
  URL2="http://repo1.maven.org/maven2/org/apache/rat/apache-rat/${RAT_VERSION}/apache-rat-${RAT_VERSION}.jar"

  JAR=$rat_jar
  
  if [[ ! -f "$rat_jar" ]]; then
    # Download rat launch jar if it hasn't been downloaded yet
    if [ ! -f "$JAR" ]; then
    # Download
    printf "Attempting to fetch rat\n"
    JAR_DL=${JAR}.part
    if hash curl 2>/dev/null; then
      (curl --progress-bar ${URL1} > "$JAR_DL" || curl --progress-bar ${URL2} > "$JAR_DL") && mv "$JAR_DL" "$JAR"
    elif hash wget 2>/dev/null; then
      (wget --progress=bar ${URL1} -O "$JAR_DL" || wget --progress=bar ${URL2} -O "$JAR_DL") && mv "$JAR_DL" "$JAR"
    else
      printf "You do not have curl or wget installed, please install rat manually.\n"
      exit -1
    fi
    fi
    if [ ! -f "$JAR" ]; then
      # We failed to download
      printf "Our attempt to download rat locally to ${JAR} failed. Please install rat manually.\n"
      exit -1
    fi
    printf "Launching rat from ${JAR}\n"
  fi
}

# Go to the Spark project root directory
FWDIR="$(cd `dirname $0`/..; pwd)"
cd "$FWDIR"

if test -x "$JAVA_HOME/bin/java"; then
    declare java_cmd="$JAVA_HOME/bin/java"
else 
    declare java_cmd=java
fi

export RAT_VERSION=0.10
export rat_jar=$FWDIR/lib/apache-rat-${RAT_VERSION}.jar
mkdir -p $FWDIR/lib

[[ -f "$rat_jar" ]] || acquire_rat_jar || {
    echo "Download failed. Obtain the rat jar manually and place it at $rat_jar"
    exit 1
}

$java_cmd -jar $rat_jar -E $FWDIR/.rat-excludes  -d $FWDIR > rat-results.txt

ERRORS=$(cat rat-results.txt | grep -e "??")

if test ! -z "$ERRORS"; then 
    echo "Could not find Apache license headers in the following files:"
    echo "$ERRORS"
    exit 1
else 
    echo -e "RAT checks passed."
fi