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lib/python3.9/site-packages/cockpit/_[ Not.Writable ]

File://lib/python3.9/site-packages/cockpit/beipack.py

# This file is part of Cockpit.
#
# Copyright (C) 2023 Red Hat, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import logging
import lzma
from typing import List, Sequence, Tuple

from cockpit._vendor import ferny
from cockpit._vendor.bei import beipack

from .data import read_cockpit_data_file
from .peer import Peer, PeerError

logger = logging.getLogger(__name__)


def get_bridge_beipack_xz() -> Tuple[str, bytes]:
    try:
        bridge_beipack_xz = read_cockpit_data_file('cockpit-bridge.beipack.xz')
        logger.debug('Got pre-built cockpit-bridge.beipack.xz')
    except FileNotFoundError:
        logger.debug('Pre-built cockpit-bridge.beipack.xz; building our own.')
        # beipack ourselves
        cockpit_contents = beipack.collect_module('cockpit', recursive=True)
        bridge_beipack = beipack.pack(cockpit_contents, entrypoint='cockpit.bridge:main', args='beipack=True')
        bridge_beipack_xz = lzma.compress(bridge_beipack.encode())
        logger.debug('  ... done!')

    return 'cockpit/data/cockpit-bridge.beipack.xz', bridge_beipack_xz


class BridgeBeibootHelper(ferny.InteractionHandler):
    # ferny.InteractionHandler ClassVar
    commands = ['beiboot.provide', 'beiboot.exc']

    peer: Peer
    payload: bytes
    steps: Sequence[Tuple[str, Sequence[object]]]

    def __init__(self, peer: Peer, args: Sequence[str] = ()) -> None:
        filename, payload = get_bridge_beipack_xz()

        self.peer = peer
        self.payload = payload
        self.steps = (('boot_xz', (filename, len(payload), tuple(args))),)

    async def run_command(self, command: str, args: Tuple, fds: List[int], stderr: str) -> None:
        logger.debug('Got ferny request %s %s %s %s', command, args, fds, stderr)
        if command == 'beiboot.provide':
            try:
                size, = args
                assert size == len(self.payload)
            except (AssertionError, ValueError) as exc:
                raise PeerError('internal-error', message=f'ferny interaction error {exc!s}') from exc

            assert self.peer.transport is not None
            logger.debug('Writing %d bytes of payload', len(self.payload))
            self.peer.transport.write(self.payload)
        elif command == 'beiboot.exc':
            raise PeerError('internal-error', message=f'Remote exception: {args[0]}')
        else:
            raise PeerError('internal-error', message=f'Unexpected ferny interaction command {command}')

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