check-license

#!/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.

# Checks that all source files contain the ASF license header
# using Apache RAT (Release Audit Tool).

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
REPO_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
RAT_VERSION="0.17"
RAT_JAR="$SCRIPT_DIR/lib/apache-rat-${RAT_VERSION}.jar"
RAT_URL="https://repo1.maven.org/maven2/org/apache/rat/apache-rat/${RAT_VERSION}/apache-rat-${RAT_VERSION}.jar"

# Download RAT if not cached
if [ ! -f "$RAT_JAR" ]; then
  echo "Downloading Apache RAT ${RAT_VERSION}..."
  mkdir -p "$SCRIPT_DIR/lib"
  curl -sSfL -o "$RAT_JAR" "$RAT_URL"
fi

# Ensure Java is available
if ! command -v java &> /dev/null; then
  echo "ERROR: Java is required to run Apache RAT."
  echo "Install Java 11+ and ensure it is on PATH."
  exit 1
fi

echo "Running Apache RAT license header check..."
java -jar "$RAT_JAR" \
  --input-exclude-file "$SCRIPT_DIR/.rat-excludes" \
  --input-exclude-std GIT IDEA MAC \
  --output-style missing-headers \
  --log-level ERROR \
  -- "$REPO_DIR"

echo "License header check passed."