dev/lint-python

#!/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.
#

SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
SPARK_ROOT_DIR="$(dirname $SCRIPT_DIR)"
PEP8_REPORT_PATH="$SPARK_ROOT_DIR/dev/pep8-report.txt"

cd $SPARK_ROOT_DIR

# Get pep8 at runtime so that we don't rely on it being installed on the build server.
#+ See: https://github.com/apache/spark/pull/1744#issuecomment-50982162
#+ TODOs:
#+  - Dynamically determine latest release version of pep8 and use that.
#+  - Download this from a more reliable source. (GitHub raw can be flaky, apparently. (?))
PEP8_SCRIPT_PATH="$SPARK_ROOT_DIR/dev/pep8.py"
PEP8_SCRIPT_REMOTE_PATH="https://raw.githubusercontent.com/jcrocholl/pep8/1.5.7/pep8.py"

curl --silent -o "$PEP8_SCRIPT_PATH" "$PEP8_SCRIPT_REMOTE_PATH"    
curl_status=$?

if [ $curl_status -ne 0 ]; then
    echo "Failed to download pep8.py from \"$PEP8_SCRIPT_REMOTE_PATH\"."
    exit $curl_status
fi


# There is no need to write this output to a file
#+ first, but we do so so that the check status can
#+ be output before the report, like with the
#+ scalastyle and RAT checks.
python $PEP8_SCRIPT_PATH ./python > "$PEP8_REPORT_PATH"
pep8_status=${PIPESTATUS[0]} #$?

if [ $pep8_status -ne 0 ]; then
    echo "PEP 8 checks failed."
    cat "$PEP8_REPORT_PATH"
else
    echo "PEP 8 checks passed."
fi

rm -f "$PEP8_REPORT_PATH"
rm "$PEP8_SCRIPT_PATH"

exit $pep8_status