51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
# Copyright 2021 The Pigweed Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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"""Generates nanopb_pb2.py by importing the Nanopb proto module.
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The Nanopb repository generates nanopb_pb2.py dynamically when its Python
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package is imported if it does not exist. If multiple processes try to use
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Nanopb to compile simultaneously on a clean build, they can interfere with each
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other. One process might rewrite nanopb_pb2.py as another process is trying to
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access it, resulting in import errors.
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This script imports the Nanopb module so that nanopb_pb2.py is generated if it
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doesn't exist. All Nanopb proto compilation targets depend on this script so
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that nanopb_pb2.py is guaranteed to exist before they need it.
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"""
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import argparse
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import importlib.util
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from pathlib import Path
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import sys
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def generate_nanopb_proto(root: Path) -> None:
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sys.path.append(str(root / 'generator'))
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spec = importlib.util.spec_from_file_location(
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'proto', root / 'generator' / 'proto' / '__init__.py')
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assert spec is not None
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proto_module = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(proto_module) # type: ignore[union-attr]
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def _parse_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('root', type=Path, help='Nanopb root')
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return parser.parse_args()
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if __name__ == '__main__':
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generate_nanopb_proto(**vars(_parse_args()))
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