grpc/tools/run_tests/build_python.sh

#!/bin/bash
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set -ex

# change to grpc repo root
cd $(dirname $0)/../..

ROOT=`pwd`
GRPCIO=$ROOT/src/python/grpcio
GRPCIO_TEST=$ROOT/src/python/grpcio_test

make_virtualenv() {
  virtualenv_name="python"$1"_virtual_environment"
  if [ ! -d $virtualenv_name ]
  then
    # Build the entire virtual environment
    virtualenv -p `which "python"$1` $virtualenv_name
    source $virtualenv_name/bin/activate

    # Install grpcio
    cd $GRPCIO
    pip install -r requirements.txt
    CFLAGS="-I$ROOT/include -std=c89" LDFLAGS=-L$ROOT/libs/$CONFIG GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install $GRPCIO

    # Install grpcio_test
    cd $GRPCIO_TEST
    pip install -r requirements.txt
    pip install $GRPCIO_TEST
  else
    source $virtualenv_name/bin/activate
    # Uninstall and re-install the packages we care about. Don't use
    # --force-reinstall or --ignore-installed to avoid propagating this
    # unnecessarily to dependencies. Don't use --no-deps to avoid missing
    # dependency upgrades.
    (yes | pip uninstall grpcio) || true
    (yes | pip uninstall grpcio_test) || true
    (CFLAGS="-I$ROOT/include -std=c89" LDFLAGS=-L$ROOT/libs/$CONFIG GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install $GRPCIO) || (
      # Fall back to rebuilding the entire environment
      rm -rf $virtualenv_name
      make_virtualenv $1
    )
    pip install $GRPCIO_TEST
  fi
}

make_virtualenv $1