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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 BuildDirLock as BuildDirLockBase
__all__ = ['BuildDirLock']
class BuildDirLock(BuildDirLockBase):
def __enter__(self) -> None:
self.lockfile = open(self.lockfilename, 'w', encoding='utf-8')
try:
fcntl.flock(self.lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
except (BlockingIOError, PermissionError):
self.lockfile.close()
raise MesonException('Some other Meson process is already using this build directory. Exiting.')
except OSError as e:
self.lockfile.close()
raise MesonException(f'Failed to lock the build directory: {e.strerror}')
def __exit__(self, *args: T.Any) -> None:
fcntl.flock(self.lockfile, fcntl.LOCK_UN)
self.lockfile.close()
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