Add scripts to build python wheel for linux. (#2693)

* Add scripts to build python wheel for linux.
Followed PEP513.

* Fix dist check for new added files.

* Update README for usage example.

Makefile.am

@@ -964,9 +964,14 @@ EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   examples/list_people.py                \
   examples/list_people_test.go           \
   protobuf.bzl                           \
+  python/release/wheel/build_wheel_manylinux.sh  \
+  python/release/wheel/Dockerfile                \
+  python/release/wheel/protobuf_optimized_pip.sh \
+  python/release/wheel/README.md         \
   six.BUILD                              \
   util/python/BUILD
 
+
 # Deletes all the files generated by autogen.sh.
 MAINTAINERCLEANFILES =   \
   aclocal.m4             \

python/release/wheel/Dockerfile

+FROM quay.io/pypa/manylinux1_x86_64
+
+RUN yum install -y libtool
+RUN /opt/python/cp27-cp27mu/bin/pip install twine
+
+COPY protobuf_optimized_pip.sh /

python/release/wheel/README.md

+Description
+------------------------------
+This directory is used to build released wheels according to PEP513 and upload
+them to pypi.
+
+Usage
+------------------------------
+For example, to release 3.3.0:
+    ./protobuf_optimized_pip.sh 3.3.0 PYPI_USERNAME PYPI_PASSWORD
+
+Structure
+------------------------------
+| Source                    | Source                                                       |
+|--------------------------------------|---------------------------------------------------|
+| protobuf_optimized_pip.sh | Entry point. Calling Dockerfile and build_wheel_manylinux.sh |
+| Dockerfile                | Build docker image according to PEP513.                      |
+| build_wheel_manylinux.sh  | Build wheel packages in the docker container.                |

python/release/wheel/build_wheel_manylinux.sh

+#!/bin/bash
+
+# Print usage and fail.
+function usage() {
+  echo "Usage: protobuf_optimized_pip.sh PROTOBUF_VERSION PYPI_USERNAME PYPI_PASSWORD" >&2
+  exit 1   # Causes caller to exit because we use -e.
+}
+
+# Validate arguments.
+if [ $0 != ./build_wheel_manylinux.sh ]; then
+  echo "Please run this script from the directory in which it is located." >&2
+  exit 1
+fi
+
+if [ $# -lt 3 ]; then
+  usage
+  exit 1
+fi
+
+PROTOBUF_VERSION=$1
+PYPI_USERNAME=$2
+PYPI_PASSWORD=$3
+
+docker rmi protobuf-python-wheel
+docker build . -t protobuf-python-wheel
+docker run --rm protobuf-python-wheel ./protobuf_optimized_pip.sh $PROTOBUF_VERSION $PYPI_USERNAME $PYPI_PASSWORD
+docker rmi protobuf-python-wheel

python/release/wheel/protobuf_optimized_pip.sh

+#!/usr/bin/env bash
+
+# DO NOT use this script manually! Called by docker.
+
+set -ex
+
+# Print usage and fail.
+function usage() {
+  echo "Usage: protobuf_optimized_pip.sh PROTOBUF_VERSION PYPI_USERNAME PYPI_PASSWORD" >&2
+  exit 1   # Causes caller to exit because we use -e.
+}
+
+# Build wheel
+function build_wheel() {
+  PYTHON_VERSION=$1
+  PYTHON_BIN=/opt/python/${PYTHON_VERSION}/bin/python
+
+  $PYTHON_BIN setup.py bdist_wheel --cpp_implementation --compile_static_extension
+  auditwheel repair dist/protobuf-${PROTOBUF_VERSION}-${PYTHON_VERSION}-linux_x86_64.whl
+}
+
+# Validate arguments.
+if [ $0 != ./protobuf_optimized_pip.sh ]; then
+  echo "Please run this script from the directory in which it is located." >&2
+  exit 1
+fi
+
+if [ $# -lt 3 ]; then
+  usage
+  exit 1
+fi
+
+PROTOBUF_VERSION=$1
+PYPI_USERNAME=$2
+PYPI_PASSWORD=$3
+
+DIR=${PWD}/'protobuf-python-build'
+PYTHON_VERSIONS=('cp27-cp27mu' 'cp33-cp33m' 'cp34-cp34m' 'cp35-cp35m' 'cp36-cp36m')
+
+mkdir -p ${DIR}
+cd ${DIR}
+curl -SsL -O https://github.com/google/protobuf/archive/v${PROTOBUF_VERSION}.tar.gz
+tar xzf v${PROTOBUF_VERSION}.tar.gz
+cd $DIR/protobuf-${PROTOBUF_VERSION}
+
+# Autoconf on centos 5.11 cannot recognize AC_PROG_OBJC.
+sed -i '/AC_PROG_OBJC/d' configure.ac
+sed -i 's/conformance\/Makefile//g' configure.ac
+
+# Build protoc
+./autogen.sh
+CXXFLAGS="-fPIC -g -O2" ./configure
+make -j8
+export PROTOC=$DIR/src/protoc
+
+cd python
+
+for PYTHON_VERSION in "${PYTHON_VERSIONS[@]}"
+do
+  build_wheel $PYTHON_VERSION
+done
+
+/opt/python/cp27-cp27mu/bin/twine upload wheelhouse/* <<!
+$PYPI_USERNAME
+$PYPI_PASSWORD
+!