mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-18 16:53:38 +00:00
47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
from __future__ import annotations
|
|
|
|
import os
|
|
import sys
|
|
from errno import EACCES, EEXIST, ENOENT
|
|
|
|
from ._api import BaseFileLock
|
|
from ._util import raise_on_exist_ro_file
|
|
|
|
|
|
class SoftFileLock(BaseFileLock):
|
|
"""Simply watches the existence of the lock file."""
|
|
|
|
def _acquire(self) -> None:
|
|
raise_on_exist_ro_file(self._lock_file)
|
|
# first check for exists and read-only mode as the open will mask this case as EEXIST
|
|
mode = (
|
|
os.O_WRONLY # open for writing only
|
|
| os.O_CREAT
|
|
| os.O_EXCL # together with above raise EEXIST if the file specified by filename exists
|
|
| os.O_TRUNC # truncate the file to zero byte
|
|
)
|
|
try:
|
|
fd = os.open(self._lock_file, mode)
|
|
except OSError as exception:
|
|
if exception.errno == EEXIST: # expected if cannot lock
|
|
pass
|
|
elif exception.errno == ENOENT: # No such file or directory - parent directory is missing
|
|
raise
|
|
elif exception.errno == EACCES and sys.platform != "win32": # pragma: win32 no cover
|
|
# Permission denied - parent dir is R/O
|
|
raise # note windows does not allow you to make a folder r/o only files
|
|
else:
|
|
self._lock_file_fd = fd
|
|
|
|
def _release(self) -> None:
|
|
os.close(self._lock_file_fd) # type: ignore # the lock file is definitely not None
|
|
self._lock_file_fd = None
|
|
try:
|
|
os.remove(self._lock_file)
|
|
except OSError: # the file is already deleted and that's what we want
|
|
pass
|
|
|
|
|
|
__all__ = [
|
|
"SoftFileLock",
|
|
]
|