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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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 | xargs 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'

violations=$(grep -r error --include checkstyle-errors.xml .| wc -l)
if [[ $violations -gt 0 ]]; then
    echo "There are $violations checkstyle violations"
    exit -1
fi
exit 0