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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 errno
from .. import MsdOperationError
# =====
class MsdDriveLockedError(MsdOperationError):
def __init__(self) -> None:
super().__init__("MSD drive is locked on IO operation")
# =====
class Drive:
def __init__(self, gadget: str, instance: int, lun: int) -> None:
self.__path = os.path.join(
"/sys/kernel/config/usb_gadget",
gadget,
f"functions/mass_storage.usb{instance}/lun.{lun}",
)
def get_sysfs_path(self) -> str:
return self.__path
# =====
def set_image_path(self, path: str) -> None:
self.__set_param("file", path)
def get_image_path(self) -> str:
return self.__get_param("file")
def set_cdrom_flag(self, flag: bool) -> None:
self.__set_param("cdrom", str(int(flag)))
def get_cdrom_flag(self) -> bool:
return bool(int(self.__get_param("cdrom")))
def set_rw_flag(self, flag: bool) -> None:
self.__set_param("ro", str(int(not flag)))
def get_rw_flag(self) -> bool:
return (not int(self.__get_param("ro")))
# =====
def __get_param(self, param: str) -> str:
with open(os.path.join(self.__path, param)) as param_file:
return param_file.read().strip()
def __set_param(self, param: str, value: str) -> None:
try:
with open(os.path.join(self.__path, param), "w") as param_file:
param_file.write(value + "\n")
except OSError as err:
if err.errno == errno.EBUSY:
raise MsdDriveLockedError()
raise
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