tools/run_tests/build_python.sh

#!/bin/bash
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set -ex

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

root=`pwd`

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

make_virtualenv $1