89 lines
3.4 KiB
Python
89 lines
3.4 KiB
Python
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
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# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
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"""Invasive patches for coverage.py"""
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from __future__ import annotations
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import atexit
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import os
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from typing import Any, Callable, NoReturn, TYPE_CHECKING
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from coverage import env
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from coverage.exceptions import ConfigError, CoverageException
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from coverage.files import create_pth_file
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if TYPE_CHECKING:
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from coverage import Coverage
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from coverage.config import CoverageConfig
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def apply_patches(cov: Coverage, config: CoverageConfig) -> None:
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"""Apply invasive patches requested by `[run] patch=`."""
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for patch in sorted(set(config.patch)):
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if patch == "_exit":
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def make_exit_patch(
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old_exit: Callable[[int], NoReturn],
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) -> Callable[[int], NoReturn]:
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def coverage_os_exit_patch(status: int) -> NoReturn:
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try:
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cov.save()
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except: # pylint: disable=bare-except
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pass
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old_exit(status)
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return coverage_os_exit_patch
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os._exit = make_exit_patch(os._exit) # type: ignore[assignment]
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elif patch == "execv":
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if env.WINDOWS:
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raise CoverageException("patch=execv isn't supported yet on Windows.")
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def make_execv_patch(fname: str, old_execv: Any) -> Any:
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def coverage_execv_patch(*args: Any, **kwargs: Any) -> Any:
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try:
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cov.save()
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except: # pylint: disable=bare-except
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pass
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if fname.endswith("e"):
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# Assume the `env` argument is passed positionally.
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new_env = args[-1]
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# Pass our environment variable in the new environment.
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new_env["COVERAGE_PROCESS_START"] = config.config_file
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if env.TESTING:
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# The subprocesses need to use the same core as the main process.
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new_env["COVERAGE_CORE"] = os.getenv("COVERAGE_CORE")
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# When testing locally, we need to honor the pyc file location
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# or they get written to the .tox directories and pollute the
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# next run with a different core.
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if (
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cache_prefix := os.getenv("PYTHONPYCACHEPREFIX")
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) is not None:
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new_env["PYTHONPYCACHEPREFIX"] = cache_prefix
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# Without this, it fails on PyPy and Ubuntu.
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new_env["PATH"] = os.getenv("PATH")
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old_execv(*args, **kwargs)
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return coverage_execv_patch
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# All the exec* and spawn* functions eventually call execv or execve.
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os.execv = make_execv_patch("execv", os.execv)
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os.execve = make_execv_patch("execve", os.execve)
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elif patch == "subprocess":
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pth_file = create_pth_file()
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assert pth_file is not None
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atexit.register(pth_file.unlink, missing_ok=True)
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assert config.config_file is not None
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os.environ["COVERAGE_PROCESS_START"] = config.config_file
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else:
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raise ConfigError(f"Unknown patch {patch!r}")
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