hadoop/hadoop-ozone/dev-support/checks/checkstyle.sh

#!/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,
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
cd "$DIR/../../.." || exit 1

REPORT_DIR=${OUTPUT_DIR:-"$DIR/../../../target/checkstyle"}
mkdir -p "$REPORT_DIR"
REPORT_FILE="$REPORT_DIR/summary.txt"

mvn -B -fn checkstyle:check -f pom.ozone.xml

#Print out the exact violations with parsing XML results with sed
find "." -name checkstyle-errors.xml -print0  | xargs -0 sed  '$!N; /<file.*\n<\/file/d;P;D' | sed '/<\/.*/d;/<checkstyle.*/d;s/<error.*line="\([[:digit:]]*\)".*message="\([^"]\+\).*/ \1: \2/;s/<file name="\([^"]*\)".*/\1/;/<\?xml.*>/d' | tee "$REPORT_FILE"

## generate counter
wc -l "$REPORT_DIR/summary.txt" | awk '{print $1}'> "$REPORT_DIR/failures"

if [[ -s "${REPORT_FILE}" ]]; then
   exit 1
fi