mirror of
https://github.com/mofeng-git/One-KVM.git
synced 2025-12-12 17:20:30 +08:00
128 lines
4.9 KiB
Python
128 lines
4.9 KiB
Python
# ========================================================================== #
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# #
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# KVMD - The main Pi-KVM daemon. #
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# #
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# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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# ========================================================================== #
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import os
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import signal
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import errno
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import argparse
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from typing import List
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from typing import Optional
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import psutil
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import yaml
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from ...validators.kvm import valid_msd_image_name
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from .. import init
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# =====
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def _make_param_path(gadget: str, param: str) -> str:
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return os.path.join(
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"/sys/kernel/config/usb_gadget",
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gadget,
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"functions/mass_storage.usb0/lun.0",
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param,
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)
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def _get_param(gadget: str, param: str) -> str:
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with open(_make_param_path(gadget, param)) as param_file:
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return param_file.read().strip()
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def _set_param(gadget: str, param: str, value: str) -> None:
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try:
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with open(_make_param_path(gadget, param), "w") as param_file:
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param_file.write(value + "\n")
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except OSError as err:
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if err.errno == errno.EBUSY:
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raise SystemExit(f"Can't change {param!r} value because device is locked: {err}")
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raise
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def _reset_msd() -> None:
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# https://github.com/torvalds/linux/blob/3039fad/drivers/usb/gadget/function/f_mass_storage.c#L2924
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found = False
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for proc in psutil.process_iter():
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attrs = proc.as_dict(attrs=["name", "exe", "pid"])
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if attrs.get("name") == "file-storage" and not attrs.get("exe"):
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try:
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proc.send_signal(signal.SIGUSR1)
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found = True
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except Exception as err:
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raise SystemExit(f"Can't send SIGUSR1 to MSD kernel thread with pid={attrs['pid']}: {err}")
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if not found:
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raise SystemExit("Can't find MSD kernel thread")
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# =====
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def main(argv: Optional[List[str]]=None) -> None:
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(parent_parser, argv, config) = init(
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add_help=False,
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argv=argv,
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load_msd=True,
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)
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parser = argparse.ArgumentParser(
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prog="kvmd-otg-msd",
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description="KVMD OTG MSD Helper",
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parents=[parent_parser],
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)
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parser.add_argument("--reset", action="store_true", help="Send SIGUSR1 to MSD kernel thread")
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parser.add_argument("--set-cdrom", default=None, choices=["0", "1"], help="Set CD-ROM flag")
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parser.add_argument("--set-ro", default=None, choices=["0", "1"], help="Set read-only flag")
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parser.add_argument("--set-image", default=None, type=valid_msd_image_name, help="Change the image")
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parser.add_argument("--eject", action="store_true", help="Eject the image")
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options = parser.parse_args(argv[1:])
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if config.kvmd.msd.type != "otg":
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raise SystemExit(f"Error: KVMD MSD not using 'otg'"
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f" (now configured {config.kvmd.msd.type!r})")
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if options.reset:
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_reset_msd()
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if options.eject:
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_set_param(config.otg.gadget, "file", "")
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if options.set_cdrom is not None:
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_set_param(config.otg.gadget, "cdrom", options.set_cdrom)
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if options.set_ro is not None:
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_set_param(config.otg.gadget, "ro", options.set_ro)
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if options.set_image:
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path = os.path.join(config.kvmd.msd.storage, "images", options.set_image)
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if not os.path.isfile(path):
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raise SystemExit(f"Can't find image {path!r}")
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_set_param(config.otg.gadget, "file", path)
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print(yaml.dump({ # type: ignore
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name: _get_param(config.otg.gadget, param)
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for (param, name) in [
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("file", "image"),
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("cdrom", "cdrom"),
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("ro", "ro"),
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]
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}, default_flow_style=False, sort_keys=False), end="")
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