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from __future__ import annotations
import contextlib
import errno
import importlib.resources
import os.path
import shutil
import stat
import subprocess
import sys
from collections.abc import Generator
from types import TracebackType
from typing import Any
from typing import Callable
from pre_commit import parse_shebang
def force_bytes(exc: Any) -> bytes:
with contextlib.suppress(TypeError):
return bytes(exc)
with contextlib.suppress(Exception):
return str(exc).encode()
return f'<unprintable {type(exc).__name__} object>'.encode()
@contextlib.contextmanager
def clean_path_on_failure(path: str) -> Generator[None]:
"""Cleans up the directory on an exceptional failure."""
try:
yield
except BaseException:
if os.path.exists(path):
rmtree(path)
raise
def resource_text(filename: str) -> str:
files = importlib.resources.files('pre_commit.resources')
return files.joinpath(filename).read_text()
def make_executable(filename: str) -> None:
original_mode = os.stat(filename).st_mode
new_mode = original_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH
os.chmod(filename, new_mode)
class CalledProcessError(RuntimeError):
def __init__(
self,
returncode: int,
cmd: tuple[str, ...],
stdout: bytes,
stderr: bytes | None,
) -> None:
super().__init__(returncode, cmd, stdout, stderr)
self.returncode = returncode
self.cmd = cmd
self.stdout = stdout
self.stderr = stderr
def __bytes__(self) -> bytes:
def _indent_or_none(part: bytes | None) -> bytes:
if part:
return b'\n ' + part.replace(b'\n', b'\n ').rstrip()
else:
return b' (none)'
return b''.join((
f'command: {self.cmd!r}\n'.encode(),
f'return code: {self.returncode}\n'.encode(),
b'stdout:', _indent_or_none(self.stdout), b'\n',
b'stderr:', _indent_or_none(self.stderr),
))
def __str__(self) -> str:
return self.__bytes__().decode()
def _setdefault_kwargs(kwargs: dict[str, Any]) -> None:
for arg in ('stdin', 'stdout', 'stderr'):
kwargs.setdefault(arg, subprocess.PIPE)
def _oserror_to_output(e: OSError) -> tuple[int, bytes, None]:
return 1, force_bytes(e).rstrip(b'\n') + b'\n', None
def cmd_output_b(
*cmd: str,
check: bool = True,
**kwargs: Any,
) -> tuple[int, bytes, bytes | None]:
_setdefault_kwargs(kwargs)
try:
cmd = parse_shebang.normalize_cmd(cmd, env=kwargs.get('env'))
except parse_shebang.ExecutableNotFoundError as e:
returncode, stdout_b, stderr_b = e.to_output()
else:
try:
proc = subprocess.Popen(cmd, **kwargs)
except OSError as e:
returncode, stdout_b, stderr_b = _oserror_to_output(e)
else:
stdout_b, stderr_b = proc.communicate()
returncode = proc.returncode
if check and returncode:
raise CalledProcessError(returncode, cmd, stdout_b, stderr_b)
return returncode, stdout_b, stderr_b
def cmd_output(*cmd: str, **kwargs: Any) -> tuple[int, str, str | None]:
returncode, stdout_b, stderr_b = cmd_output_b(*cmd, **kwargs)
stdout = stdout_b.decode() if stdout_b is not None else None
stderr = stderr_b.decode() if stderr_b is not None else None
return returncode, stdout, stderr
if sys.platform != 'win32': # pragma: win32 no cover
from os import openpty
import termios
class Pty:
def __init__(self) -> None:
self.r: int | None = None
self.w: int | None = None
def __enter__(self) -> Pty:
self.r, self.w = openpty()
# tty flags normally change \n to \r\n
attrs = termios.tcgetattr(self.w)
assert isinstance(attrs[1], int)
attrs[1] &= ~(termios.ONLCR | termios.OPOST)
termios.tcsetattr(self.w, termios.TCSANOW, attrs)
return self
def close_w(self) -> None:
if self.w is not None:
os.close(self.w)
self.w = None
def close_r(self) -> None:
assert self.r is not None
os.close(self.r)
self.r = None
def __exit__(
self,
exc_type: type[BaseException] | None,
exc_value: BaseException | None,
traceback: TracebackType | None,
) -> None:
self.close_w()
self.close_r()
def cmd_output_p(
*cmd: str,
check: bool = True,
**kwargs: Any,
) -> tuple[int, bytes, bytes | None]:
assert check is False
assert kwargs['stderr'] == subprocess.STDOUT, kwargs['stderr']
_setdefault_kwargs(kwargs)
try:
cmd = parse_shebang.normalize_cmd(cmd)
except parse_shebang.ExecutableNotFoundError as e:
return e.to_output()
with open(os.devnull) as devnull, Pty() as pty:
assert pty.r is not None
kwargs.update({'stdin': devnull, 'stdout': pty.w, 'stderr': pty.w})
try:
proc = subprocess.Popen(cmd, **kwargs)
except OSError as e:
return _oserror_to_output(e)
pty.close_w()
buf = b''
while True:
try:
bts = os.read(pty.r, 4096)
except OSError as e:
if e.errno == errno.EIO:
bts = b''
else:
raise
else:
buf += bts
if not bts:
break
return proc.wait(), buf, None
else: # pragma: no cover
cmd_output_p = cmd_output_b
def _handle_readonly(
func: Callable[[str], object],
path: str,
exc: BaseException,
) -> None:
if (
func in (os.rmdir, os.remove, os.unlink) and
isinstance(exc, OSError) and
exc.errno in {errno.EACCES, errno.EPERM}
):
for p in (path, os.path.dirname(path)):
os.chmod(p, os.stat(p).st_mode | stat.S_IWUSR)
func(path)
else:
raise
if sys.version_info < (3, 12): # pragma: <3.12 cover
def _handle_readonly_old(
func: Callable[[str], object],
path: str,
excinfo: tuple[type[BaseException], BaseException, TracebackType],
) -> None:
return _handle_readonly(func, path, excinfo[1])
def rmtree(path: str) -> None:
shutil.rmtree(path, ignore_errors=False, onerror=_handle_readonly_old)
else: # pragma: >=3.12 cover
def rmtree(path: str) -> None:
"""On windows, rmtree fails for readonly dirs."""
shutil.rmtree(path, ignore_errors=False, onexc=_handle_readonly)
def win_exe(s: str) -> str:
return s if sys.platform != 'win32' else f'{s}.exe'