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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 types import TracebackType from typing import Any from typing import Callable from typing import Generator 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: return importlib.resources.read_text('pre_commit.resources', filename) 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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