1# Copyright 2019 The gRPC Authors 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15import os 16import site 17import sys 18 19_GRPC_BAZEL_RUNTIME_ENV = "GRPC_BAZEL_RUNTIME" 20 21 22# TODO(https://github.com/bazelbuild/bazel/issues/6844) Bazel failed to 23# interpret namespace packages correctly. This monkey patch will force the 24# Python process to parse the .pth file in the sys.path to resolve namespace 25# package in the right place. 26# Analysis in depth: https://github.com/bazelbuild/rules_python/issues/55 27def sys_path_to_site_dir_hack(): 28 """Add valid sys.path item to site directory to parse the .pth files.""" 29 # Only run within our Bazel environment 30 if not os.environ.get(_GRPC_BAZEL_RUNTIME_ENV): 31 return 32 items = [] 33 for item in sys.path: 34 if os.path.exists(item): 35 # The only difference between sys.path and site-directory is 36 # whether the .pth file will be parsed or not. A site-directory 37 # will always exist in sys.path, but not another way around. 38 items.append(item) 39 for item in items: 40 site.addsitedir(item) 41