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

#!/usr/bin/env bash
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# The ASF licenses this file to You under the Apache License, Version 2.0
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#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
cd "$DIR/../../.." || exit 1

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'

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