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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2021 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 signal
import psutil
# =====
_PROCESS_NAME = "file-storage"
# =====
def _log(msg: str) -> None:
print(msg, file=sys.stderr)
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") == _PROCESS_NAME and not attrs.get("exe"):
_log(f"Sending SIGUSR1 to MSD {_PROCESS_NAME!r} kernel thread with pid={attrs['pid']} ...")
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(f"Can't find MSD kernel thread {_PROCESS_NAME!r}")
# =====
def main() -> None:
if len(sys.argv) != 2 or sys.argv[1] != "unlock":
raise SystemExit(f"Usage: {sys.argv[0]} [unlock]")
_unlock()
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