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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 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 os
import signal
import errno
import argparse
from typing import List
from typing import Optional
import psutil
from ...validators.basic import valid_bool
from ...validators.basic import valid_int_f0
from ...validators.os import valid_abs_file
from .. import init
# =====
def _make_param_path(gadget: str, instance: int, param: str) -> str:
return os.path.join(
"/sys/kernel/config/usb_gadget",
gadget,
f"functions/mass_storage.usb{instance}/lun.0",
param,
)
def _get_param(gadget: str, instance: int, param: str) -> str:
with open(_make_param_path(gadget, instance, param)) as param_file:
return param_file.read().strip()
def _set_param(gadget: str, instance: int, param: str, value: str) -> None:
try:
with open(_make_param_path(gadget, instance, param), "w") as param_file:
param_file.write(value + "\n")
except OSError as err:
if err.errno == errno.EBUSY:
raise SystemExit(f"Can't change {param!r} value because device is locked: {err}")
raise
def _unlock() -> None:
# https://github.com/torvalds/linux/blob/3039fad/drivers/usb/gadget/function/f_mass_storage.c#L2924
found = False
for proc in psutil.process_iter():
attrs = proc.as_dict(attrs=["name", "exe", "pid"])
if attrs.get("name") == "file-storage" and not attrs.get("exe"):
try:
proc.send_signal(signal.SIGUSR1)
found = True
except Exception as err:
raise SystemExit(f"Can't send SIGUSR1 to MSD kernel thread with pid={attrs['pid']}: {err}")
if not found:
raise SystemExit("Can't find MSD kernel thread")
# =====
def main(argv: Optional[List[str]]=None) -> None:
(parent_parser, argv, config) = init(
add_help=False,
argv=argv,
load_msd=True,
)
parser = argparse.ArgumentParser(
prog="kvmd-otgmsd",
description="KVMD OTG-MSD low-level hand tool",
parents=[parent_parser],
)
parser.add_argument("-i", "--instance", default=0, type=valid_int_f0,
metavar="<N>", help="Drive instance (0 for KVMD drive)")
parser.add_argument("--unlock", action="store_true",
help="Send SIGUSR1 to MSD kernel thread")
parser.add_argument("--set-cdrom", default=None, type=valid_bool,
metavar="<1|0|yes|no>", help="Set CD-ROM flag")
parser.add_argument("--set-rw", default=None, type=valid_bool,
metavar="<1|0|yes|no>", help="Set RW flag")
parser.add_argument("--set-image", default=None, type=valid_abs_file,
metavar="<path>", help="Set the image file")
parser.add_argument("--eject", action="store_true",
help="Eject the image")
options = parser.parse_args(argv[1:])
if config.kvmd.msd.type != "otg":
raise SystemExit(f"Error: KVMD MSD not using 'otg'"
f" (now configured {config.kvmd.msd.type!r})")
set_param = (lambda param, value: _set_param(config.otg.gadget, options.instance, param, value))
get_param = (lambda param: _get_param(config.otg.gadget, options.instance, param))
if options.unlock:
_unlock()
if options.eject:
set_param("file", "")
if options.set_cdrom is not None:
set_param("cdrom", str(int(options.set_cdrom)))
if options.set_rw is not None:
set_param("ro", str(int(not options.set_rw)))
if options.set_image:
if not os.path.isfile(options.set_image):
raise SystemExit(f"Not a file: {options.set_image}")
set_param("file", options.set_image)
print("Image file: ", (get_param("file") or "<none>"))
print("CD-ROM flag:", ("yes" if int(get_param("cdrom")) else "no"))
print("RW flag: ", ("no" if int(get_param("ro")) else "yes"))
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