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parent_kernel.py
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parent_kernel.py
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#!/usr/bin/python
#
# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Does some intialization that must happen before "swift_kernel.py" runs, and
# then launches "swift_kernel.py" as a subprocess.
import os
import signal
import subprocess
import sys
import tempfile
# The args to launch "swift_kernel.py" are the same as the args we received,
# except with "parent_kernel.py" replaced with "swift_kernel.py".
args = [
sys.executable,
os.path.join(os.path.dirname(sys.argv[0]), 'swift_kernel.py')
]
args += sys.argv[1:]
# Construct a temporary directory for package installation scratchwork. This
# must happen in the parent process because we need to set the
# SWIFT_IMPORT_SEARCH_PATH environment in the child to tell LLDB where module
# files go.
package_install_scratchwork_base = tempfile.mkdtemp()
package_install_scratchwork_base = os.path.join(package_install_scratchwork_base, 'swift-install')
swift_import_search_path = os.path.join(package_install_scratchwork_base,
'modules')
# Launch "swift_kernel.py".
process = subprocess.Popen(
args, env=dict(os.environ,
SWIFT_IMPORT_SEARCH_PATH=swift_import_search_path))
# Forward SIGINT to the subprocess so that it can handle interrupt requests
# from Jupyter.
def handle_sigint(sig, frame):
process.send_signal(signal.SIGINT)
signal.signal(signal.SIGINT, handle_sigint)
process.wait()