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#!/usr/bin/env python3
# ========================================================================== #
# #
# 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
import psutil
# =====
def _set_msd_image(gadget: str, path: str) -> None:
lun_file_path = os.path.join("/sys/kernel/config/usb_gadget", gadget, "functions/mass_storage.usb0/lun.0/file")
try:
with open(lun_file_path, "w") as lun_file:
lun_file.write(path + "\n")
except OSError as err:
if err.errno == errno.EBUSY:
raise SystemExit(f"Can't change image because device is locked: {str(err)}")
raise
def _reset_msd() -> None:
# https://github.com/torvalds/linux/blob/3039fadf2bfdc104dc963820c305778c7c1a6229/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:
SystemExit(f"Can't send SIGUSR1 to MSD kernel thread with pid={attrs['pid']}: {str(err)}")
if not found:
raise SystemExit("Can't find MSD kernel thread")
# =====
def main() -> None:
parser = argparse.ArgumentParser(description="KVMD OTG MSD Helper")
parser.add_argument("--reset", action="store_true", help="Send SIGUSR1 to MSD kernel thread")
parser.add_argument("--set-image", dest="image_path", default=None, help="Change active image path")
parser.add_argument("--gadget", default="kvmd", help="USB gadget name")
options = parser.parse_args()
if options.reset:
_reset_msd()
if options.image_path is not None:
_set_msd_image(options.gadget, options.image_path)
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