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# SPDX-License-Identifier: Apache-2.0
# Copyright 2012-2021 The Meson development team
# Copyright © 2021-2023 Intel Corporation
from __future__ import annotations
"""Posix specific implementations of mesonlib functionality."""
import fcntl
import typing as T
from .core import MesonException
from .platform import DirectoryLockBase, DirectoryLockAction
__all__ = ['DirectoryLock', 'DirectoryLockAction']
class DirectoryLock(DirectoryLockBase):
def __enter__(self) -> None:
self.lockfile = open(self.lockpath, 'w+', encoding='utf-8')
try:
flags = fcntl.LOCK_EX
if self.action != DirectoryLockAction.WAIT:
flags = flags | fcntl.LOCK_NB
fcntl.flock(self.lockfile, flags)
except BlockingIOError:
self.lockfile.close()
if self.action == DirectoryLockAction.IGNORE:
return
raise MesonException(self.err)
except PermissionError:
self.lockfile.close()
raise MesonException(self.err)
except OSError as e:
self.lockfile.close()
raise MesonException(f'Failed to lock directory {self.lockpath}: {e.strerror}')
def __exit__(self, *args: T.Any) -> None:
if self.lockfile is None or self.lockfile.closed:
return
fcntl.flock(self.lockfile, fcntl.LOCK_UN)
self.lockfile.close()
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