Add license checker (#34)

.github/workflows/check-licensing.yml

@@ -0,0 +1,38 @@
+################################################################################
+#  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.
+################################################################################
+
+name: Check licensing
+
+on: [push, pull_request]
+
+jobs:
+  rat-check:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set JDK
+        uses: actions/setup-java@v2
+        with:
+          java-version: 8
+          distribution: 'adopt'
+
+      - name: Check licensing
+        run: ./dev/check-licensing.sh

dev/.rat-excludes

@@ -0,0 +1,21 @@
+################################################################################
+#  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.
+################################################################################
+
+paimon-python-java-bridge/*
+.gitignore
+rat-results.txt

dev/check-licensing.sh

@@ -0,0 +1,80 @@
+#!/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.
+################################################################################
+
+download_rat_jar () {
+    URL="https://repo.maven.apache.org/maven2/org/apache/rat/apache-rat/${RAT_VERSION}/apache-rat-${RAT_VERSION}.jar"
+    JAR="$rat_jar"
+
+    # Download rat launch jar
+    echo "Attempting to fetch rat"
+    wget --quiet ${URL} -O "$JAR"
+}
+
+CURR_DIR=`pwd`
+SOURCE_PACKAGE=${SOURCE_PACKAGE}
+
+export RAT_VERSION=0.15
+export rat_jar=rat/apache-rat-${RAT_VERSION}.jar
+
+if [ -z "${SOURCE_PACKAGE}" ]; then
+    BASE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+    PROJECT_ROOT="${BASE_DIR}/../"
+    cd ${PROJECT_ROOT}
+
+    # Sanity check to ensure that resolved paths are valid; a LICENSE file should always exist in project root
+    if [ ! -f ${PROJECT_ROOT}/LICENSE ]; then
+        echo "Project root path ${PROJECT_ROOT} is not valid; script may be in the wrong directory."
+        exit 1
+    fi
+
+	  RUN_RAT="java -jar ${rat_jar} -E ${PROJECT_ROOT}/dev/.rat-excludes -d ${PROJECT_ROOT}"
+else
+    EXTENSION='.tar.gz'
+    # get unzipped directory
+    PACKAGE_DIR="${SOURCE_PACKAGE:0:$((${#SOURCE_PACKAGE} - ${#EXTENSION}))}"
+    tar -xf ${SOURCE_PACKAGE}
+
+    RUN_RAT="java -jar ${rat_jar} -e PKG-INFO -e setup.cfg -e pypaimon.egg-info/* -d ${PACKAGE_DIR}"
+fi
+
+mkdir -p rat
+download_rat_jar
+
+$RUN_RAT > rat/rat-results.txt
+
+if [ $? -ne 0 ]; then
+    echo "RAT exited abnormally"
+    exit 1
+fi
+
+ERRORS="$(cat rat/rat-results.txt | grep -e "??")"
+
+# clean
+rm -rf rat
+if [ -d "$PACKAGE_DIR" ]; then
+    rm -rf $PACKAGE_DIR
+fi
+
+if [[ -n "${ERRORS}" ]]; then
+    echo "Could not find Apache license headers in the following files:"
+    echo ${ERRORS}
+    exit 1
+else
+    echo -e "RAT checks passed."
+fi