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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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 dataclasses
from typing import Optional
from ....logging import get_logger
from .... import aiohelpers
from .. import MsdError
# =====
@dataclasses.dataclass(frozen=True)
class _Image:
name: str
path: str
storage: Optional["Storage"] = dataclasses.field(compare=False)
complete: bool = dataclasses.field(init=False, compare=False)
in_storage: bool = dataclasses.field(init=False, compare=False)
size: int = dataclasses.field(init=False, compare=False)
mod_ts: float = dataclasses.field(init=False, compare=False)
class Image(_Image):
@property
def complete(self) -> bool:
if self.storage is not None:
return os.path.exists(self.__get_complete_path())
return True
@property
def in_storage(self) -> bool:
return (self.storage is not None)
@property
def size(self) -> int:
try:
return os.stat(self.path).st_size
except Exception:
return 0
@property
def mod_ts(self) -> float:
try:
return os.stat(self.path).st_mtime
except Exception:
return 0
def exists(self) -> bool:
return os.path.exists(self.path)
async def remount_rw(self, rw: bool, fatal: bool=True) -> None:
assert self.storage
await self.storage.remount_rw(rw, fatal)
def remove(self, fatal: bool) -> None:
assert self.storage is not None
try:
os.remove(self.path)
except FileNotFoundError:
pass
except Exception:
if fatal:
raise
self.set_complete(False)
def set_complete(self, flag: bool) -> None:
assert self.storage is not None
path = self.__get_complete_path()
if flag:
open(path, "w").close() # pylint: disable=consider-using-with
else:
try:
os.remove(path)
except FileNotFoundError:
pass
def __get_complete_path(self) -> str:
return os.path.join(os.path.dirname(self.path), f".__{self.name}.complete")
@dataclasses.dataclass(frozen=True)
class StorageSpace:
size: int
free: int
class Storage:
def __init__(self, path: str, remount_cmd: list[str]) -> None:
self.__path = path
self.__remount_cmd = remount_cmd
def get_watchable_paths(self) -> list[str]:
return [self.__path]
def get_images(self) -> dict[str, Image]:
return {
name: self.get_image_by_name(name)
for name in os.listdir(self.__path)
if not name.startswith(".__") and name != "lost+found"
}
def get_image_by_name(self, name: str) -> Image:
assert name
path = os.path.join(self.__path, name)
return self.__get_image(name, path)
def get_image_by_path(self, path: str) -> Image:
assert path
name = os.path.basename(path)
return self.__get_image(name, path)
def __get_image(self, name: str, path: str) -> Image:
assert name
assert not name.startswith(".__")
assert name != "lost+found"
assert path
in_storage = (os.path.dirname(path) == self.__path)
return Image(name, path, (self if in_storage else None))
def get_space(self, fatal: bool) -> (StorageSpace | None):
try:
st = os.statvfs(self.__path)
except Exception as err:
if fatal:
raise
get_logger().warning("Can't get free space of filesystem %s: %s", self.__path, err)
return None
return StorageSpace(
size=(st.f_blocks * st.f_frsize),
free=(st.f_bavail * st.f_frsize),
)
async def remount_rw(self, rw: bool, fatal: bool=True) -> None:
if not (await aiohelpers.remount("MSD", self.__remount_cmd, rw)):
if fatal:
raise MsdError("Can't execute remount helper")
|
