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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, None, 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 rmtree(path: str) -> None:

"""On windows, rmtree fails for readonly dirs."""

def handle_remove_readonly(

func: Callable[..., Any],

path: str,

exc: tuple[type[OSError], OSError, TracebackType],

) -> None:

excvalue = exc[1]

if (

func in (os.rmdir, os.remove, os.unlink) and

excvalue.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

shutil.rmtree(path, ignore_errors=False, onerror=handle_remove_readonly)

def win_exe(s: str) -> str:

return s if sys.platform != 'win32' else f'{s}.exe'

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