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Squashed commits: [cd479ba] formatting and linting automation [7fbfabb] formatting and linting automation [c4f9505] fix after rebase [f506ad4] rename job [441d517] update doc (+7 squashed commits) [2e1b416] fix invoke and github action [6ae5bb4] doc for git blame [44b5461] add GitHub action [b07474f] add docs [4cd9a6f] more linter fixes [db71901] wip [540dc88] wip
81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import asyncio
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import pty
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import tty
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import io
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import atexit
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import os
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import logging
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from .common import Transport, StreamPacketSource, StreamPacketSink
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# -----------------------------------------------------------------------------
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# Logging
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# -----------------------------------------------------------------------------
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logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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async def open_pty_transport(spec):
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'''
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Open a PTY transport.
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The parameter string may be empty, or a path name where a symbolic link
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to the PTY will be created (the link will be removed when the transport
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is closed or when the process exits)
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'''
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primary, replica = pty.openpty()
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replica_path = os.ttyname(replica)
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logger.debug(f'pty open at {replica_path}')
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tty.setraw(primary)
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tty.setraw(replica)
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read_transport, packet_source = await asyncio.get_running_loop().connect_read_pipe(
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StreamPacketSource, io.open(primary, 'rb', closefd=False)
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)
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write_transport, _ = await asyncio.get_running_loop().connect_write_pipe(
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asyncio.BaseProtocol, io.open(primary, 'wb', closefd=False)
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)
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packet_sink = StreamPacketSink(write_transport)
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def cleanup():
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if spec:
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try:
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os.unlink(spec)
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except FileNotFoundError:
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pass
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# If required, create a symbolic link to the replica
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# NOTE: the link will be removed when this process exits
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if spec:
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os.symlink(replica_path, spec)
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logger.debug(f'linked pty at {spec}')
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atexit.register(cleanup)
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class PtyTransport(Transport):
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async def close(self):
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write_transport.close()
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read_transport.close()
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os.close(primary)
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os.close(replica)
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cleanup()
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return PtyTransport(packet_source, packet_sink)
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