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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <[email protected]> #
# #
# 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 sys
import os
import signal
import asyncio
import asyncio.subprocess
import argparse
import aiohttp
from ...logging import get_logger
from ... import tools
from ... import aiotools
from ... import aioproc
from ... import htclient
from ... import htserver
from .. import init
# =====
def _preexec() -> None:
os.setpgrp()
if os.isatty(0):
try:
os.tcsetpgrp(0, os.getpgid(0))
except Exception as err:
get_logger(0).info("Can't perform tcsetpgrp(0): %s", tools.efmt(err))
async def _run_process(cmd: list[str], data_path: str) -> asyncio.subprocess.Process: # pylint: disable=no-member
# https://stackoverflow.com/questions/58918188/why-is-stdin-not-propagated-to-child-process-of-different-process-group
if os.isatty(0):
signal.signal(signal.SIGTTOU, signal.SIG_IGN)
return (await asyncio.create_subprocess_exec(
*cmd,
preexec_fn=_preexec,
env={
**os.environ,
"KVMD_PST_DATA": data_path,
},
))
async def _run_cmd_ws(cmd: list[str], ws: aiohttp.ClientWebSocketResponse) -> int: # pylint: disable=too-many-branches
logger = get_logger(0)
receive_task: (asyncio.Task | None) = None
proc_task: (asyncio.Task | None) = None
proc: (asyncio.subprocess.Process | None) = None # pylint: disable=no-member
try: # pylint: disable=too-many-nested-blocks
while True:
if receive_task is None:
receive_task = asyncio.create_task(ws.receive())
if proc_task is None and proc is not None:
proc_task = asyncio.create_task(proc.wait())
tasks = list(filter(None, [receive_task, proc_task]))
done = (await aiotools.wait_first(*tasks))[0]
if receive_task in done:
msg = receive_task.result()
if msg.type == aiohttp.WSMsgType.TEXT:
(event_type, event) = htserver.parse_ws_event(msg.data)
if event_type == "storage_state":
if event["data"]["write_allowed"] and proc is None:
logger.info("PST write is allowed: %s", event["data"]["path"])
logger.info("Running the process ...")
proc = await _run_process(cmd, event["data"]["path"])
elif not event["data"]["write_allowed"]:
logger.error("PST write is not allowed")
break
elif msg.type == aiohttp.WSMsgType.CLOSED:
logger.error("PST connection closed")
break
else:
logger.error("Unknown PST message type: %r", msg)
break
receive_task = None
if proc_task in done:
break
except Exception:
logger.exception("Unhandled exception")
if receive_task is not None:
receive_task.cancel()
if proc_task is not None:
proc_task.cancel()
if proc is not None:
await aioproc.kill_process(proc, 1, logger)
assert proc.returncode is not None
logger.info("Process finished: returncode=%d", proc.returncode)
return proc.returncode
return 1
async def _run_cmd(cmd: list[str], unix_path: str) -> None:
get_logger(0).info("Opening PST session ...")
async with aiohttp.ClientSession(
headers={"User-Agent": htclient.make_user_agent("KVMD-PSTRun")},
connector=aiohttp.UnixConnector(path=unix_path),
timeout=aiohttp.ClientTimeout(total=5),
) as session:
async with session.ws_connect("http://localhost:0/ws") as ws:
sys.exit(await _run_cmd_ws(cmd, ws))
# =====
def main(argv: (list[str] | None)=None) -> None:
(parent_parser, argv, config) = init(
add_help=False,
cli_logging=True,
argv=argv,
)
parser = argparse.ArgumentParser(
prog="kvmd-pstrun",
description="Request the access to KVMD persistent storage and run the script",
parents=[parent_parser],
)
parser.add_argument("cmd", nargs="+", help="Script with arguments to run")
options = parser.parse_args(argv[1:])
aiotools.run(_run_cmd(options.cmd, config.pst.server.unix))
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