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 "$SCRIPT_DIR")"
PATHS_TO_CHECK="./python/pyspark/ ./examples/src/main/python/ ./dev/sparktestsupport"
PATHS_TO_CHECK="$PATHS_TO_CHECK ./dev/run-tests.py ./python/run-tests.py ./dev/run-tests-jenkins.py"
PEP8_REPORT_PATH="$SPARK_ROOT_DIR/dev/pep8-report.txt"
PYLINT_REPORT_PATH="$SPARK_ROOT_DIR/dev/pylint-report.txt"
PYLINT_INSTALL_INFO="$SPARK_ROOT_DIR/dev/pylint-info.txt"
SPHINXBUILD=${SPHINXBUILD:=sphinx-build}
SPHINX_REPORT_PATH="$SPARK_ROOT_DIR/dev/sphinx-report.txt"

cd "$SPARK_ROOT_DIR"

# compileall: https://docs.python.org/2/library/compileall.html
python -B -m compileall -q -l $PATHS_TO_CHECK > "$PEP8_REPORT_PATH"
compile_status="${PIPESTATUS[0]}"

# 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:
#+  - Download pep8 from PyPI. It's more "official".
PEP8_VERSION="1.7.0"
PEP8_SCRIPT_PATH="$SPARK_ROOT_DIR/dev/pep8-$PEP8_VERSION.py"
PEP8_SCRIPT_REMOTE_PATH="https://raw.githubusercontent.com/jcrocholl/pep8/$PEP8_VERSION/pep8.py"

if [ ! -e "$PEP8_SCRIPT_PATH" ]; then
    curl --silent -o "$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
fi

# Easy install pylint in /dev/pylint. To easy_install into a directory, the PYTHONPATH should
# be set to the directory.
# dev/pylint should be appended to the PATH variable as well.
# Jenkins by default installs the pylint3 version, so for now this just checks the code quality
# of python3.
export "PYTHONPATH=$SPARK_ROOT_DIR/dev/pylint"
export "PYLINT_HOME=$PYTHONPATH"
export "PATH=$PYTHONPATH:$PATH"

# 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" --ignore=E402,E731,E241,W503,E226 --config=dev/tox.ini $PATHS_TO_CHECK >> "$PEP8_REPORT_PATH"
pep8_status="${PIPESTATUS[0]}"

if [ "$compile_status" -eq 0 -a "$pep8_status" -eq 0 ]; then
    lint_status=0
else
    lint_status=1
fi

if [ "$lint_status" -ne 0 ]; then
    echo "PEP8 checks failed."
    cat "$PEP8_REPORT_PATH"
    rm "$PEP8_REPORT_PATH"
    exit "$lint_status"
else
    echo "PEP8 checks passed."
    rm "$PEP8_REPORT_PATH"
fi

# Check that the documentation builds acceptably, skip check if sphinx is not installed.
if hash "$SPHINXBUILD" 2> /dev/null; then
  cd python/docs
  make clean
  # Treat warnings as errors so we stop correctly
  SPHINXOPTS="-a -W" make html &> "$SPHINX_REPORT_PATH" || lint_status=1
  if [ "$lint_status" -ne 0 ]; then
    echo "pydoc checks failed."
    cat "$SPHINX_REPORT_PATH"
    echo "re-running make html to print full warning list"
    make clean
    SPHINXOPTS="-a" make html
    rm "$SPHINX_REPORT_PATH"
    exit "$lint_status"
  else
    echo "pydoc checks passed."
    rm "$SPHINX_REPORT_PATH"
  fi
  cd ../..
else
  echo >&2 "The $SPHINXBUILD command was not found. Skipping pydoc checks for now"
fi