1942 lines
75 KiB
Python
1942 lines
75 KiB
Python
# subprocess - Subprocesses with accessible I/O streams
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#
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# For more information about this module, see PEP 324.
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#
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# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
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#
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# Licensed to PSF under a Contributor Agreement.
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# See http://www.python.org/2.4/license for licensing details.
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r"""Subprocesses with accessible I/O streams
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This module allows you to spawn processes, connect to their
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input/output/error pipes, and obtain their return codes.
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For a complete description of this module see the Python documentation.
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Main API
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========
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run(...): Runs a command, waits for it to complete, then returns a
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CompletedProcess instance.
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Popen(...): A class for flexibly executing a command in a new process
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Constants
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---------
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DEVNULL: Special value that indicates that os.devnull should be used
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PIPE: Special value that indicates a pipe should be created
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STDOUT: Special value that indicates that stderr should go to stdout
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Older API
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=========
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call(...): Runs a command, waits for it to complete, then returns
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the return code.
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check_call(...): Same as call() but raises CalledProcessError()
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if return code is not 0
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check_output(...): Same as check_call() but returns the contents of
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stdout instead of a return code
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getoutput(...): Runs a command in the shell, waits for it to complete,
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then returns the output
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getstatusoutput(...): Runs a command in the shell, waits for it to complete,
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then returns a (exitcode, output) tuple
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"""
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import builtins
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import errno
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import io
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import os
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import time
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import signal
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import sys
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import threading
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import warnings
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import contextlib
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from time import monotonic as _time
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__all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", "getstatusoutput",
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"getoutput", "check_output", "run", "CalledProcessError", "DEVNULL",
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"SubprocessError", "TimeoutExpired", "CompletedProcess"]
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# NOTE: We intentionally exclude list2cmdline as it is
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# considered an internal implementation detail. issue10838.
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try:
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import msvcrt
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import _winapi
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_mswindows = True
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except ModuleNotFoundError:
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_mswindows = False
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import _posixsubprocess
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import select
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import selectors
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else:
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from _winapi import (CREATE_NEW_CONSOLE, CREATE_NEW_PROCESS_GROUP,
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STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
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STD_ERROR_HANDLE, SW_HIDE,
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STARTF_USESTDHANDLES, STARTF_USESHOWWINDOW,
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ABOVE_NORMAL_PRIORITY_CLASS, BELOW_NORMAL_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS, IDLE_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS, REALTIME_PRIORITY_CLASS,
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CREATE_NO_WINDOW, DETACHED_PROCESS,
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CREATE_DEFAULT_ERROR_MODE, CREATE_BREAKAWAY_FROM_JOB)
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__all__.extend(["CREATE_NEW_CONSOLE", "CREATE_NEW_PROCESS_GROUP",
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"STD_INPUT_HANDLE", "STD_OUTPUT_HANDLE",
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"STD_ERROR_HANDLE", "SW_HIDE",
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"STARTF_USESTDHANDLES", "STARTF_USESHOWWINDOW",
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"STARTUPINFO",
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"ABOVE_NORMAL_PRIORITY_CLASS", "BELOW_NORMAL_PRIORITY_CLASS",
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"HIGH_PRIORITY_CLASS", "IDLE_PRIORITY_CLASS",
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"NORMAL_PRIORITY_CLASS", "REALTIME_PRIORITY_CLASS",
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"CREATE_NO_WINDOW", "DETACHED_PROCESS",
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"CREATE_DEFAULT_ERROR_MODE", "CREATE_BREAKAWAY_FROM_JOB"])
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# Exception classes used by this module.
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class SubprocessError(Exception): pass
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class CalledProcessError(SubprocessError):
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"""Raised when run() is called with check=True and the process
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returns a non-zero exit status.
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Attributes:
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cmd, returncode, stdout, stderr, output
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"""
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def __init__(self, returncode, cmd, output=None, stderr=None):
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self.returncode = returncode
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self.cmd = cmd
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self.output = output
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self.stderr = stderr
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def __str__(self):
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if self.returncode and self.returncode < 0:
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try:
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return "Command '%s' died with %r." % (
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self.cmd, signal.Signals(-self.returncode))
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except ValueError:
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return "Command '%s' died with unknown signal %d." % (
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self.cmd, -self.returncode)
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else:
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return "Command '%s' returned non-zero exit status %d." % (
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self.cmd, self.returncode)
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@property
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def stdout(self):
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"""Alias for output attribute, to match stderr"""
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return self.output
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@stdout.setter
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def stdout(self, value):
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# There's no obvious reason to set this, but allow it anyway so
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# .stdout is a transparent alias for .output
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self.output = value
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class TimeoutExpired(SubprocessError):
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"""This exception is raised when the timeout expires while waiting for a
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child process.
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Attributes:
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cmd, output, stdout, stderr, timeout
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"""
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def __init__(self, cmd, timeout, output=None, stderr=None):
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self.cmd = cmd
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self.timeout = timeout
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self.output = output
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self.stderr = stderr
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def __str__(self):
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return ("Command '%s' timed out after %s seconds" %
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(self.cmd, self.timeout))
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@property
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def stdout(self):
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return self.output
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@stdout.setter
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def stdout(self, value):
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# There's no obvious reason to set this, but allow it anyway so
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# .stdout is a transparent alias for .output
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self.output = value
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if _mswindows:
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class STARTUPINFO:
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def __init__(self, *, dwFlags=0, hStdInput=None, hStdOutput=None,
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hStdError=None, wShowWindow=0, lpAttributeList=None):
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self.dwFlags = dwFlags
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self.hStdInput = hStdInput
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self.hStdOutput = hStdOutput
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self.hStdError = hStdError
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self.wShowWindow = wShowWindow
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self.lpAttributeList = lpAttributeList or {"handle_list": []}
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def copy(self):
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attr_list = self.lpAttributeList.copy()
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if 'handle_list' in attr_list:
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attr_list['handle_list'] = list(attr_list['handle_list'])
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return STARTUPINFO(dwFlags=self.dwFlags,
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hStdInput=self.hStdInput,
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hStdOutput=self.hStdOutput,
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hStdError=self.hStdError,
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wShowWindow=self.wShowWindow,
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lpAttributeList=attr_list)
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class Handle(int):
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closed = False
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def Close(self, CloseHandle=_winapi.CloseHandle):
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if not self.closed:
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self.closed = True
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CloseHandle(self)
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def Detach(self):
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if not self.closed:
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self.closed = True
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return int(self)
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raise ValueError("already closed")
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def __repr__(self):
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return "%s(%d)" % (self.__class__.__name__, int(self))
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__del__ = Close
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else:
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# When select or poll has indicated that the file is writable,
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# we can write up to _PIPE_BUF bytes without risk of blocking.
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# POSIX defines PIPE_BUF as >= 512.
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_PIPE_BUF = getattr(select, 'PIPE_BUF', 512)
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# poll/select have the advantage of not requiring any extra file
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# descriptor, contrarily to epoll/kqueue (also, they require a single
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# syscall).
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if hasattr(selectors, 'PollSelector'):
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_PopenSelector = selectors.PollSelector
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else:
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_PopenSelector = selectors.SelectSelector
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if _mswindows:
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# On Windows we just need to close `Popen._handle` when we no longer need
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# it, so that the kernel can free it. `Popen._handle` gets closed
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# implicitly when the `Popen` instance is finalized (see `Handle.__del__`,
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# which is calling `CloseHandle` as requested in [1]), so there is nothing
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# for `_cleanup` to do.
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#
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# [1] https://docs.microsoft.com/en-us/windows/desktop/ProcThread/
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# creating-processes
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_active = None
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def _cleanup():
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pass
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else:
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# This lists holds Popen instances for which the underlying process had not
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# exited at the time its __del__ method got called: those processes are
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# wait()ed for synchronously from _cleanup() when a new Popen object is
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# created, to avoid zombie processes.
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_active = []
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def _cleanup():
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if _active is None:
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return
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for inst in _active[:]:
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res = inst._internal_poll(_deadstate=sys.maxsize)
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if res is not None:
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try:
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_active.remove(inst)
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except ValueError:
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# This can happen if two threads create a new Popen instance.
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# It's harmless that it was already removed, so ignore.
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pass
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PIPE = -1
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STDOUT = -2
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DEVNULL = -3
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# XXX This function is only used by multiprocessing and the test suite,
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# but it's here so that it can be imported when Python is compiled without
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# threads.
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def _optim_args_from_interpreter_flags():
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"""Return a list of command-line arguments reproducing the current
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optimization settings in sys.flags."""
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args = []
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value = sys.flags.optimize
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if value > 0:
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args.append('-' + 'O' * value)
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return args
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def _args_from_interpreter_flags():
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"""Return a list of command-line arguments reproducing the current
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settings in sys.flags, sys.warnoptions and sys._xoptions."""
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flag_opt_map = {
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'debug': 'd',
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# 'inspect': 'i',
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# 'interactive': 'i',
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'dont_write_bytecode': 'B',
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'no_site': 'S',
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'verbose': 'v',
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'bytes_warning': 'b',
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'quiet': 'q',
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# -O is handled in _optim_args_from_interpreter_flags()
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}
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args = _optim_args_from_interpreter_flags()
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for flag, opt in flag_opt_map.items():
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v = getattr(sys.flags, flag)
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if v > 0:
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args.append('-' + opt * v)
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if sys.flags.isolated:
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args.append('-I')
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else:
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if sys.flags.ignore_environment:
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args.append('-E')
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if sys.flags.no_user_site:
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args.append('-s')
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# -W options
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warnopts = sys.warnoptions[:]
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bytes_warning = sys.flags.bytes_warning
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xoptions = getattr(sys, '_xoptions', {})
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dev_mode = ('dev' in xoptions)
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if bytes_warning > 1:
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warnopts.remove("error::BytesWarning")
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elif bytes_warning:
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warnopts.remove("default::BytesWarning")
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if dev_mode:
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warnopts.remove('default')
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for opt in warnopts:
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args.append('-W' + opt)
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# -X options
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if dev_mode:
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args.extend(('-X', 'dev'))
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for opt in ('faulthandler', 'tracemalloc', 'importtime',
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'showalloccount', 'showrefcount', 'utf8'):
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if opt in xoptions:
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value = xoptions[opt]
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if value is True:
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arg = opt
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else:
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arg = '%s=%s' % (opt, value)
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args.extend(('-X', arg))
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return args
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def call(*popenargs, timeout=None, **kwargs):
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"""Run command with arguments. Wait for command to complete or
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timeout, then return the returncode attribute.
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The arguments are the same as for the Popen constructor. Example:
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retcode = call(["ls", "-l"])
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"""
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with Popen(*popenargs, **kwargs) as p:
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try:
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return p.wait(timeout=timeout)
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except: # Including KeyboardInterrupt, wait handled that.
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p.kill()
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# We don't call p.wait() again as p.__exit__ does that for us.
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raise
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def check_call(*popenargs, **kwargs):
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"""Run command with arguments. Wait for command to complete. If
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the exit code was zero then return, otherwise raise
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CalledProcessError. The CalledProcessError object will have the
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return code in the returncode attribute.
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The arguments are the same as for the call function. Example:
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check_call(["ls", "-l"])
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"""
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retcode = call(*popenargs, **kwargs)
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if retcode:
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cmd = kwargs.get("args")
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if cmd is None:
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cmd = popenargs[0]
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raise CalledProcessError(retcode, cmd)
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return 0
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def check_output(*popenargs, timeout=None, **kwargs):
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r"""Run command with arguments and return its output.
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If the exit code was non-zero it raises a CalledProcessError. The
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CalledProcessError object will have the return code in the returncode
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attribute and output in the output attribute.
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The arguments are the same as for the Popen constructor. Example:
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>>> check_output(["ls", "-l", "/dev/null"])
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b'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
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The stdout argument is not allowed as it is used internally.
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To capture standard error in the result, use stderr=STDOUT.
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>>> check_output(["/bin/sh", "-c",
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... "ls -l non_existent_file ; exit 0"],
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... stderr=STDOUT)
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b'ls: non_existent_file: No such file or directory\n'
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There is an additional optional argument, "input", allowing you to
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pass a string to the subprocess's stdin. If you use this argument
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you may not also use the Popen constructor's "stdin" argument, as
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it too will be used internally. Example:
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>>> check_output(["sed", "-e", "s/foo/bar/"],
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... input=b"when in the course of fooman events\n")
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b'when in the course of barman events\n'
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By default, all communication is in bytes, and therefore any "input"
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should be bytes, and the return value will be bytes. If in text mode,
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any "input" should be a string, and the return value will be a string
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decoded according to locale encoding, or by "encoding" if set. Text mode
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is triggered by setting any of text, encoding, errors or universal_newlines.
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"""
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if 'stdout' in kwargs:
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raise ValueError('stdout argument not allowed, it will be overridden.')
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if 'input' in kwargs and kwargs['input'] is None:
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# Explicitly passing input=None was previously equivalent to passing an
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# empty string. That is maintained here for backwards compatibility.
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kwargs['input'] = '' if kwargs.get('universal_newlines', False) else b''
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return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
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**kwargs).stdout
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class CompletedProcess(object):
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"""A process that has finished running.
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This is returned by run().
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Attributes:
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args: The list or str args passed to run().
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returncode: The exit code of the process, negative for signals.
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stdout: The standard output (None if not captured).
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stderr: The standard error (None if not captured).
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"""
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def __init__(self, args, returncode, stdout=None, stderr=None):
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self.args = args
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self.returncode = returncode
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self.stdout = stdout
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self.stderr = stderr
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def __repr__(self):
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args = ['args={!r}'.format(self.args),
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'returncode={!r}'.format(self.returncode)]
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if self.stdout is not None:
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args.append('stdout={!r}'.format(self.stdout))
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if self.stderr is not None:
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args.append('stderr={!r}'.format(self.stderr))
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return "{}({})".format(type(self).__name__, ', '.join(args))
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def check_returncode(self):
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"""Raise CalledProcessError if the exit code is non-zero."""
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if self.returncode:
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raise CalledProcessError(self.returncode, self.args, self.stdout,
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self.stderr)
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def run(*popenargs,
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input=None, capture_output=False, timeout=None, check=False, **kwargs):
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"""Run command with arguments and return a CompletedProcess instance.
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The returned instance will have attributes args, returncode, stdout and
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stderr. By default, stdout and stderr are not captured, and those attributes
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will be None. Pass stdout=PIPE and/or stderr=PIPE in order to capture them.
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If check is True and the exit code was non-zero, it raises a
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CalledProcessError. The CalledProcessError object will have the return code
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in the returncode attribute, and output & stderr attributes if those streams
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were captured.
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If timeout is given, and the process takes too long, a TimeoutExpired
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exception will be raised.
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There is an optional argument "input", allowing you to
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pass bytes or a string to the subprocess's stdin. If you use this argument
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you may not also use the Popen constructor's "stdin" argument, as
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it will be used internally.
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By default, all communication is in bytes, and therefore any "input" should
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be bytes, and the stdout and stderr will be bytes. If in text mode, any
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"input" should be a string, and stdout and stderr will be strings decoded
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according to locale encoding, or by "encoding" if set. Text mode is
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triggered by setting any of text, encoding, errors or universal_newlines.
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The other arguments are the same as for the Popen constructor.
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"""
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if input is not None:
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if kwargs.get('stdin') is not None:
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raise ValueError('stdin and input arguments may not both be used.')
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kwargs['stdin'] = PIPE
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if capture_output:
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if kwargs.get('stdout') is not None or kwargs.get('stderr') is not None:
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raise ValueError('stdout and stderr arguments may not be used '
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'with capture_output.')
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kwargs['stdout'] = PIPE
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kwargs['stderr'] = PIPE
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with Popen(*popenargs, **kwargs) as process:
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try:
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stdout, stderr = process.communicate(input, timeout=timeout)
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except TimeoutExpired as exc:
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process.kill()
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if _mswindows:
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# Windows accumulates the output in a single blocking
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# read() call run on child threads, with the timeout
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# being done in a join() on those threads. communicate()
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# _after_ kill() is required to collect that and add it
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# to the exception.
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exc.stdout, exc.stderr = process.communicate()
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else:
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# POSIX _communicate already populated the output so
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# far into the TimeoutExpired exception.
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process.wait()
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raise
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except: # Including KeyboardInterrupt, communicate handled that.
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process.kill()
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# We don't call process.wait() as .__exit__ does that for us.
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raise
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retcode = process.poll()
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if check and retcode:
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raise CalledProcessError(retcode, process.args,
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output=stdout, stderr=stderr)
|
|
return CompletedProcess(process.args, retcode, stdout, stderr)
|
|
|
|
|
|
def list2cmdline(seq):
|
|
"""
|
|
Translate a sequence of arguments into a command line
|
|
string, using the same rules as the MS C runtime:
|
|
|
|
1) Arguments are delimited by white space, which is either a
|
|
space or a tab.
|
|
|
|
2) A string surrounded by double quotation marks is
|
|
interpreted as a single argument, regardless of white space
|
|
contained within. A quoted string can be embedded in an
|
|
argument.
|
|
|
|
3) A double quotation mark preceded by a backslash is
|
|
interpreted as a literal double quotation mark.
|
|
|
|
4) Backslashes are interpreted literally, unless they
|
|
immediately precede a double quotation mark.
|
|
|
|
5) If backslashes immediately precede a double quotation mark,
|
|
every pair of backslashes is interpreted as a literal
|
|
backslash. If the number of backslashes is odd, the last
|
|
backslash escapes the next double quotation mark as
|
|
described in rule 3.
|
|
"""
|
|
|
|
# See
|
|
# http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
|
|
# or search http://msdn.microsoft.com for
|
|
# "Parsing C++ Command-Line Arguments"
|
|
result = []
|
|
needquote = False
|
|
for arg in map(os.fsdecode, seq):
|
|
bs_buf = []
|
|
|
|
# Add a space to separate this argument from the others
|
|
if result:
|
|
result.append(' ')
|
|
|
|
needquote = (" " in arg) or ("\t" in arg) or not arg
|
|
if needquote:
|
|
result.append('"')
|
|
|
|
for c in arg:
|
|
if c == '\\':
|
|
# Don't know if we need to double yet.
|
|
bs_buf.append(c)
|
|
elif c == '"':
|
|
# Double backslashes.
|
|
result.append('\\' * len(bs_buf)*2)
|
|
bs_buf = []
|
|
result.append('\\"')
|
|
else:
|
|
# Normal char
|
|
if bs_buf:
|
|
result.extend(bs_buf)
|
|
bs_buf = []
|
|
result.append(c)
|
|
|
|
# Add remaining backslashes, if any.
|
|
if bs_buf:
|
|
result.extend(bs_buf)
|
|
|
|
if needquote:
|
|
result.extend(bs_buf)
|
|
result.append('"')
|
|
|
|
return ''.join(result)
|
|
|
|
|
|
# Various tools for executing commands and looking at their output and status.
|
|
#
|
|
|
|
def getstatusoutput(cmd):
|
|
"""Return (exitcode, output) of executing cmd in a shell.
|
|
|
|
Execute the string 'cmd' in a shell with 'check_output' and
|
|
return a 2-tuple (status, output). The locale encoding is used
|
|
to decode the output and process newlines.
|
|
|
|
A trailing newline is stripped from the output.
|
|
The exit status for the command can be interpreted
|
|
according to the rules for the function 'wait'. Example:
|
|
|
|
>>> import subprocess
|
|
>>> subprocess.getstatusoutput('ls /bin/ls')
|
|
(0, '/bin/ls')
|
|
>>> subprocess.getstatusoutput('cat /bin/junk')
|
|
(1, 'cat: /bin/junk: No such file or directory')
|
|
>>> subprocess.getstatusoutput('/bin/junk')
|
|
(127, 'sh: /bin/junk: not found')
|
|
>>> subprocess.getstatusoutput('/bin/kill $$')
|
|
(-15, '')
|
|
"""
|
|
try:
|
|
data = check_output(cmd, shell=True, text=True, stderr=STDOUT)
|
|
exitcode = 0
|
|
except CalledProcessError as ex:
|
|
data = ex.output
|
|
exitcode = ex.returncode
|
|
if data[-1:] == '\n':
|
|
data = data[:-1]
|
|
return exitcode, data
|
|
|
|
def getoutput(cmd):
|
|
"""Return output (stdout or stderr) of executing cmd in a shell.
|
|
|
|
Like getstatusoutput(), except the exit status is ignored and the return
|
|
value is a string containing the command's output. Example:
|
|
|
|
>>> import subprocess
|
|
>>> subprocess.getoutput('ls /bin/ls')
|
|
'/bin/ls'
|
|
"""
|
|
return getstatusoutput(cmd)[1]
|
|
|
|
|
|
def _use_posix_spawn():
|
|
"""Check if posix_spawn() can be used for subprocess.
|
|
|
|
subprocess requires a posix_spawn() implementation that properly reports
|
|
errors to the parent process, & sets errno on the following failures:
|
|
|
|
* Process attribute actions failed.
|
|
* File actions failed.
|
|
* exec() failed.
|
|
|
|
Prefer an implementation which can use vfork() in some cases for best
|
|
performance.
|
|
"""
|
|
if _mswindows or not hasattr(os, 'posix_spawn'):
|
|
# os.posix_spawn() is not available
|
|
return False
|
|
|
|
if sys.platform == 'darwin':
|
|
# posix_spawn() is a syscall on macOS and properly reports errors
|
|
return True
|
|
|
|
# Check libc name and runtime libc version
|
|
try:
|
|
ver = os.confstr('CS_GNU_LIBC_VERSION')
|
|
# parse 'glibc 2.28' as ('glibc', (2, 28))
|
|
parts = ver.split(maxsplit=1)
|
|
if len(parts) != 2:
|
|
# reject unknown format
|
|
raise ValueError
|
|
libc = parts[0]
|
|
version = tuple(map(int, parts[1].split('.')))
|
|
|
|
if sys.platform == 'linux' and libc == 'glibc' and version >= (2, 24):
|
|
# glibc 2.24 has a new Linux posix_spawn implementation using vfork
|
|
# which properly reports errors to the parent process.
|
|
return True
|
|
# Note: Don't use the implementation in earlier glibc because it doesn't
|
|
# use vfork (even if glibc 2.26 added a pipe to properly report errors
|
|
# to the parent process).
|
|
except (AttributeError, ValueError, OSError):
|
|
# os.confstr() or CS_GNU_LIBC_VERSION value not available
|
|
pass
|
|
|
|
# By default, assume that posix_spawn() does not properly report errors.
|
|
return False
|
|
|
|
|
|
_USE_POSIX_SPAWN = _use_posix_spawn()
|
|
|
|
|
|
class Popen(object):
|
|
""" Execute a child program in a new process.
|
|
|
|
For a complete description of the arguments see the Python documentation.
|
|
|
|
Arguments:
|
|
args: A string, or a sequence of program arguments.
|
|
|
|
bufsize: supplied as the buffering argument to the open() function when
|
|
creating the stdin/stdout/stderr pipe file objects
|
|
|
|
executable: A replacement program to execute.
|
|
|
|
stdin, stdout and stderr: These specify the executed programs' standard
|
|
input, standard output and standard error file handles, respectively.
|
|
|
|
preexec_fn: (POSIX only) An object to be called in the child process
|
|
just before the child is executed.
|
|
|
|
close_fds: Controls closing or inheriting of file descriptors.
|
|
|
|
shell: If true, the command will be executed through the shell.
|
|
|
|
cwd: Sets the current directory before the child is executed.
|
|
|
|
env: Defines the environment variables for the new process.
|
|
|
|
text: If true, decode stdin, stdout and stderr using the given encoding
|
|
(if set) or the system default otherwise.
|
|
|
|
universal_newlines: Alias of text, provided for backwards compatibility.
|
|
|
|
startupinfo and creationflags (Windows only)
|
|
|
|
restore_signals (POSIX only)
|
|
|
|
start_new_session (POSIX only)
|
|
|
|
pass_fds (POSIX only)
|
|
|
|
encoding and errors: Text mode encoding and error handling to use for
|
|
file objects stdin, stdout and stderr.
|
|
|
|
Attributes:
|
|
stdin, stdout, stderr, pid, returncode
|
|
"""
|
|
_child_created = False # Set here since __del__ checks it
|
|
|
|
def __init__(self, args, bufsize=-1, executable=None,
|
|
stdin=None, stdout=None, stderr=None,
|
|
preexec_fn=None, close_fds=True,
|
|
shell=False, cwd=None, env=None, universal_newlines=None,
|
|
startupinfo=None, creationflags=0,
|
|
restore_signals=True, start_new_session=False,
|
|
pass_fds=(), *, encoding=None, errors=None, text=None):
|
|
"""Create new Popen instance."""
|
|
_cleanup()
|
|
# Held while anything is calling waitpid before returncode has been
|
|
# updated to prevent clobbering returncode if wait() or poll() are
|
|
# called from multiple threads at once. After acquiring the lock,
|
|
# code must re-check self.returncode to see if another thread just
|
|
# finished a waitpid() call.
|
|
self._waitpid_lock = threading.Lock()
|
|
|
|
self._input = None
|
|
self._communication_started = False
|
|
if bufsize is None:
|
|
bufsize = -1 # Restore default
|
|
if not isinstance(bufsize, int):
|
|
raise TypeError("bufsize must be an integer")
|
|
|
|
if _mswindows:
|
|
if preexec_fn is not None:
|
|
raise ValueError("preexec_fn is not supported on Windows "
|
|
"platforms")
|
|
else:
|
|
# POSIX
|
|
if pass_fds and not close_fds:
|
|
warnings.warn("pass_fds overriding close_fds.", RuntimeWarning)
|
|
close_fds = True
|
|
if startupinfo is not None:
|
|
raise ValueError("startupinfo is only supported on Windows "
|
|
"platforms")
|
|
if creationflags != 0:
|
|
raise ValueError("creationflags is only supported on Windows "
|
|
"platforms")
|
|
|
|
self.args = args
|
|
self.stdin = None
|
|
self.stdout = None
|
|
self.stderr = None
|
|
self.pid = None
|
|
self.returncode = None
|
|
self.encoding = encoding
|
|
self.errors = errors
|
|
|
|
# Validate the combinations of text and universal_newlines
|
|
if (text is not None and universal_newlines is not None
|
|
and bool(universal_newlines) != bool(text)):
|
|
raise SubprocessError('Cannot disambiguate when both text '
|
|
'and universal_newlines are supplied but '
|
|
'different. Pass one or the other.')
|
|
|
|
# Input and output objects. The general principle is like
|
|
# this:
|
|
#
|
|
# Parent Child
|
|
# ------ -----
|
|
# p2cwrite ---stdin---> p2cread
|
|
# c2pread <--stdout--- c2pwrite
|
|
# errread <--stderr--- errwrite
|
|
#
|
|
# On POSIX, the child objects are file descriptors. On
|
|
# Windows, these are Windows file handles. The parent objects
|
|
# are file descriptors on both platforms. The parent objects
|
|
# are -1 when not using PIPEs. The child objects are -1
|
|
# when not redirecting.
|
|
|
|
(p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
|
|
|
|
# We wrap OS handles *before* launching the child, otherwise a
|
|
# quickly terminating child could make our fds unwrappable
|
|
# (see #8458).
|
|
|
|
if _mswindows:
|
|
if p2cwrite != -1:
|
|
p2cwrite = msvcrt.open_osfhandle(p2cwrite.Detach(), 0)
|
|
if c2pread != -1:
|
|
c2pread = msvcrt.open_osfhandle(c2pread.Detach(), 0)
|
|
if errread != -1:
|
|
errread = msvcrt.open_osfhandle(errread.Detach(), 0)
|
|
|
|
self.text_mode = encoding or errors or text or universal_newlines
|
|
|
|
# How long to resume waiting on a child after the first ^C.
|
|
# There is no right value for this. The purpose is to be polite
|
|
# yet remain good for interactive users trying to exit a tool.
|
|
self._sigint_wait_secs = 0.25 # 1/xkcd221.getRandomNumber()
|
|
|
|
self._closed_child_pipe_fds = False
|
|
|
|
if self.text_mode:
|
|
if bufsize == 1:
|
|
line_buffering = True
|
|
# Use the default buffer size for the underlying binary streams
|
|
# since they don't support line buffering.
|
|
bufsize = -1
|
|
else:
|
|
line_buffering = False
|
|
|
|
try:
|
|
if p2cwrite != -1:
|
|
self.stdin = io.open(p2cwrite, 'wb', bufsize)
|
|
if self.text_mode:
|
|
self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
|
|
line_buffering=line_buffering,
|
|
encoding=encoding, errors=errors)
|
|
if c2pread != -1:
|
|
self.stdout = io.open(c2pread, 'rb', bufsize)
|
|
if self.text_mode:
|
|
self.stdout = io.TextIOWrapper(self.stdout,
|
|
encoding=encoding, errors=errors)
|
|
if errread != -1:
|
|
self.stderr = io.open(errread, 'rb', bufsize)
|
|
if self.text_mode:
|
|
self.stderr = io.TextIOWrapper(self.stderr,
|
|
encoding=encoding, errors=errors)
|
|
|
|
self._execute_child(args, executable, preexec_fn, close_fds,
|
|
pass_fds, cwd, env,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite,
|
|
restore_signals, start_new_session)
|
|
except:
|
|
# Cleanup if the child failed starting.
|
|
for f in filter(None, (self.stdin, self.stdout, self.stderr)):
|
|
try:
|
|
f.close()
|
|
except OSError:
|
|
pass # Ignore EBADF or other errors.
|
|
|
|
if not self._closed_child_pipe_fds:
|
|
to_close = []
|
|
if stdin == PIPE:
|
|
to_close.append(p2cread)
|
|
if stdout == PIPE:
|
|
to_close.append(c2pwrite)
|
|
if stderr == PIPE:
|
|
to_close.append(errwrite)
|
|
if hasattr(self, '_devnull'):
|
|
to_close.append(self._devnull)
|
|
for fd in to_close:
|
|
try:
|
|
if _mswindows and isinstance(fd, Handle):
|
|
fd.Close()
|
|
else:
|
|
os.close(fd)
|
|
except OSError:
|
|
pass
|
|
|
|
raise
|
|
|
|
@property
|
|
def universal_newlines(self):
|
|
# universal_newlines as retained as an alias of text_mode for API
|
|
# compatibility. bpo-31756
|
|
return self.text_mode
|
|
|
|
@universal_newlines.setter
|
|
def universal_newlines(self, universal_newlines):
|
|
self.text_mode = bool(universal_newlines)
|
|
|
|
def _translate_newlines(self, data, encoding, errors):
|
|
data = data.decode(encoding, errors)
|
|
return data.replace("\r\n", "\n").replace("\r", "\n")
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, value, traceback):
|
|
if self.stdout:
|
|
self.stdout.close()
|
|
if self.stderr:
|
|
self.stderr.close()
|
|
try: # Flushing a BufferedWriter may raise an error
|
|
if self.stdin:
|
|
self.stdin.close()
|
|
finally:
|
|
if exc_type == KeyboardInterrupt:
|
|
# https://bugs.python.org/issue25942
|
|
# In the case of a KeyboardInterrupt we assume the SIGINT
|
|
# was also already sent to our child processes. We can't
|
|
# block indefinitely as that is not user friendly.
|
|
# If we have not already waited a brief amount of time in
|
|
# an interrupted .wait() or .communicate() call, do so here
|
|
# for consistency.
|
|
if self._sigint_wait_secs > 0:
|
|
try:
|
|
self._wait(timeout=self._sigint_wait_secs)
|
|
except TimeoutExpired:
|
|
pass
|
|
self._sigint_wait_secs = 0 # Note that this has been done.
|
|
return # resume the KeyboardInterrupt
|
|
|
|
# Wait for the process to terminate, to avoid zombies.
|
|
self.wait()
|
|
|
|
def __del__(self, _maxsize=sys.maxsize, _warn=warnings.warn):
|
|
if not self._child_created:
|
|
# We didn't get to successfully create a child process.
|
|
return
|
|
if self.returncode is None:
|
|
# Not reading subprocess exit status creates a zombie process which
|
|
# is only destroyed at the parent python process exit
|
|
_warn("subprocess %s is still running" % self.pid,
|
|
ResourceWarning, source=self)
|
|
# In case the child hasn't been waited on, check if it's done.
|
|
self._internal_poll(_deadstate=_maxsize)
|
|
if self.returncode is None and _active is not None:
|
|
# Child is still running, keep us alive until we can wait on it.
|
|
_active.append(self)
|
|
|
|
def _get_devnull(self):
|
|
if not hasattr(self, '_devnull'):
|
|
self._devnull = os.open(os.devnull, os.O_RDWR)
|
|
return self._devnull
|
|
|
|
def _stdin_write(self, input):
|
|
if input:
|
|
try:
|
|
self.stdin.write(input)
|
|
except BrokenPipeError:
|
|
pass # communicate() must ignore broken pipe errors.
|
|
except OSError as exc:
|
|
if exc.errno == errno.EINVAL:
|
|
# bpo-19612, bpo-30418: On Windows, stdin.write() fails
|
|
# with EINVAL if the child process exited or if the child
|
|
# process is still running but closed the pipe.
|
|
pass
|
|
else:
|
|
raise
|
|
|
|
try:
|
|
self.stdin.close()
|
|
except BrokenPipeError:
|
|
pass # communicate() must ignore broken pipe errors.
|
|
except OSError as exc:
|
|
if exc.errno == errno.EINVAL:
|
|
pass
|
|
else:
|
|
raise
|
|
|
|
def communicate(self, input=None, timeout=None):
|
|
"""Interact with process: Send data to stdin and close it.
|
|
Read data from stdout and stderr, until end-of-file is
|
|
reached. Wait for process to terminate.
|
|
|
|
The optional "input" argument should be data to be sent to the
|
|
child process, or None, if no data should be sent to the child.
|
|
communicate() returns a tuple (stdout, stderr).
|
|
|
|
By default, all communication is in bytes, and therefore any
|
|
"input" should be bytes, and the (stdout, stderr) will be bytes.
|
|
If in text mode (indicated by self.text_mode), any "input" should
|
|
be a string, and (stdout, stderr) will be strings decoded
|
|
according to locale encoding, or by "encoding" if set. Text mode
|
|
is triggered by setting any of text, encoding, errors or
|
|
universal_newlines.
|
|
"""
|
|
|
|
if self._communication_started and input:
|
|
raise ValueError("Cannot send input after starting communication")
|
|
|
|
# Optimization: If we are not worried about timeouts, we haven't
|
|
# started communicating, and we have one or zero pipes, using select()
|
|
# or threads is unnecessary.
|
|
if (timeout is None and not self._communication_started and
|
|
[self.stdin, self.stdout, self.stderr].count(None) >= 2):
|
|
stdout = None
|
|
stderr = None
|
|
if self.stdin:
|
|
self._stdin_write(input)
|
|
elif self.stdout:
|
|
stdout = self.stdout.read()
|
|
self.stdout.close()
|
|
elif self.stderr:
|
|
stderr = self.stderr.read()
|
|
self.stderr.close()
|
|
self.wait()
|
|
else:
|
|
if timeout is not None:
|
|
endtime = _time() + timeout
|
|
else:
|
|
endtime = None
|
|
|
|
try:
|
|
stdout, stderr = self._communicate(input, endtime, timeout)
|
|
except KeyboardInterrupt:
|
|
# https://bugs.python.org/issue25942
|
|
# See the detailed comment in .wait().
|
|
if timeout is not None:
|
|
sigint_timeout = min(self._sigint_wait_secs,
|
|
self._remaining_time(endtime))
|
|
else:
|
|
sigint_timeout = self._sigint_wait_secs
|
|
self._sigint_wait_secs = 0 # nothing else should wait.
|
|
try:
|
|
self._wait(timeout=sigint_timeout)
|
|
except TimeoutExpired:
|
|
pass
|
|
raise # resume the KeyboardInterrupt
|
|
|
|
finally:
|
|
self._communication_started = True
|
|
|
|
sts = self.wait(timeout=self._remaining_time(endtime))
|
|
|
|
return (stdout, stderr)
|
|
|
|
|
|
def poll(self):
|
|
"""Check if child process has terminated. Set and return returncode
|
|
attribute."""
|
|
return self._internal_poll()
|
|
|
|
|
|
def _remaining_time(self, endtime):
|
|
"""Convenience for _communicate when computing timeouts."""
|
|
if endtime is None:
|
|
return None
|
|
else:
|
|
return endtime - _time()
|
|
|
|
|
|
def _check_timeout(self, endtime, orig_timeout, stdout_seq, stderr_seq,
|
|
skip_check_and_raise=False):
|
|
"""Convenience for checking if a timeout has expired."""
|
|
if endtime is None:
|
|
return
|
|
if skip_check_and_raise or _time() > endtime:
|
|
raise TimeoutExpired(
|
|
self.args, orig_timeout,
|
|
output=b''.join(stdout_seq) if stdout_seq else None,
|
|
stderr=b''.join(stderr_seq) if stderr_seq else None)
|
|
|
|
|
|
def wait(self, timeout=None):
|
|
"""Wait for child process to terminate; returns self.returncode."""
|
|
if timeout is not None:
|
|
endtime = _time() + timeout
|
|
try:
|
|
return self._wait(timeout=timeout)
|
|
except KeyboardInterrupt:
|
|
# https://bugs.python.org/issue25942
|
|
# The first keyboard interrupt waits briefly for the child to
|
|
# exit under the common assumption that it also received the ^C
|
|
# generated SIGINT and will exit rapidly.
|
|
if timeout is not None:
|
|
sigint_timeout = min(self._sigint_wait_secs,
|
|
self._remaining_time(endtime))
|
|
else:
|
|
sigint_timeout = self._sigint_wait_secs
|
|
self._sigint_wait_secs = 0 # nothing else should wait.
|
|
try:
|
|
self._wait(timeout=sigint_timeout)
|
|
except TimeoutExpired:
|
|
pass
|
|
raise # resume the KeyboardInterrupt
|
|
|
|
def _close_pipe_fds(self,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite):
|
|
# self._devnull is not always defined.
|
|
devnull_fd = getattr(self, '_devnull', None)
|
|
|
|
with contextlib.ExitStack() as stack:
|
|
if _mswindows:
|
|
if p2cread != -1:
|
|
stack.callback(p2cread.Close)
|
|
if c2pwrite != -1:
|
|
stack.callback(c2pwrite.Close)
|
|
if errwrite != -1:
|
|
stack.callback(errwrite.Close)
|
|
else:
|
|
if p2cread != -1 and p2cwrite != -1 and p2cread != devnull_fd:
|
|
stack.callback(os.close, p2cread)
|
|
if c2pwrite != -1 and c2pread != -1 and c2pwrite != devnull_fd:
|
|
stack.callback(os.close, c2pwrite)
|
|
if errwrite != -1 and errread != -1 and errwrite != devnull_fd:
|
|
stack.callback(os.close, errwrite)
|
|
|
|
if devnull_fd is not None:
|
|
stack.callback(os.close, devnull_fd)
|
|
|
|
# Prevent a double close of these handles/fds from __init__ on error.
|
|
self._closed_child_pipe_fds = True
|
|
|
|
if _mswindows:
|
|
#
|
|
# Windows methods
|
|
#
|
|
def _get_handles(self, stdin, stdout, stderr):
|
|
"""Construct and return tuple with IO objects:
|
|
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
|
|
"""
|
|
if stdin is None and stdout is None and stderr is None:
|
|
return (-1, -1, -1, -1, -1, -1)
|
|
|
|
p2cread, p2cwrite = -1, -1
|
|
c2pread, c2pwrite = -1, -1
|
|
errread, errwrite = -1, -1
|
|
|
|
if stdin is None:
|
|
p2cread = _winapi.GetStdHandle(_winapi.STD_INPUT_HANDLE)
|
|
if p2cread is None:
|
|
p2cread, _ = _winapi.CreatePipe(None, 0)
|
|
p2cread = Handle(p2cread)
|
|
_winapi.CloseHandle(_)
|
|
elif stdin == PIPE:
|
|
p2cread, p2cwrite = _winapi.CreatePipe(None, 0)
|
|
p2cread, p2cwrite = Handle(p2cread), Handle(p2cwrite)
|
|
elif stdin == DEVNULL:
|
|
p2cread = msvcrt.get_osfhandle(self._get_devnull())
|
|
elif isinstance(stdin, int):
|
|
p2cread = msvcrt.get_osfhandle(stdin)
|
|
else:
|
|
# Assuming file-like object
|
|
p2cread = msvcrt.get_osfhandle(stdin.fileno())
|
|
p2cread = self._make_inheritable(p2cread)
|
|
|
|
if stdout is None:
|
|
c2pwrite = _winapi.GetStdHandle(_winapi.STD_OUTPUT_HANDLE)
|
|
if c2pwrite is None:
|
|
_, c2pwrite = _winapi.CreatePipe(None, 0)
|
|
c2pwrite = Handle(c2pwrite)
|
|
_winapi.CloseHandle(_)
|
|
elif stdout == PIPE:
|
|
c2pread, c2pwrite = _winapi.CreatePipe(None, 0)
|
|
c2pread, c2pwrite = Handle(c2pread), Handle(c2pwrite)
|
|
elif stdout == DEVNULL:
|
|
c2pwrite = msvcrt.get_osfhandle(self._get_devnull())
|
|
elif isinstance(stdout, int):
|
|
c2pwrite = msvcrt.get_osfhandle(stdout)
|
|
else:
|
|
# Assuming file-like object
|
|
c2pwrite = msvcrt.get_osfhandle(stdout.fileno())
|
|
c2pwrite = self._make_inheritable(c2pwrite)
|
|
|
|
if stderr is None:
|
|
errwrite = _winapi.GetStdHandle(_winapi.STD_ERROR_HANDLE)
|
|
if errwrite is None:
|
|
_, errwrite = _winapi.CreatePipe(None, 0)
|
|
errwrite = Handle(errwrite)
|
|
_winapi.CloseHandle(_)
|
|
elif stderr == PIPE:
|
|
errread, errwrite = _winapi.CreatePipe(None, 0)
|
|
errread, errwrite = Handle(errread), Handle(errwrite)
|
|
elif stderr == STDOUT:
|
|
errwrite = c2pwrite
|
|
elif stderr == DEVNULL:
|
|
errwrite = msvcrt.get_osfhandle(self._get_devnull())
|
|
elif isinstance(stderr, int):
|
|
errwrite = msvcrt.get_osfhandle(stderr)
|
|
else:
|
|
# Assuming file-like object
|
|
errwrite = msvcrt.get_osfhandle(stderr.fileno())
|
|
errwrite = self._make_inheritable(errwrite)
|
|
|
|
return (p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
|
|
def _make_inheritable(self, handle):
|
|
"""Return a duplicate of handle, which is inheritable"""
|
|
h = _winapi.DuplicateHandle(
|
|
_winapi.GetCurrentProcess(), handle,
|
|
_winapi.GetCurrentProcess(), 0, 1,
|
|
_winapi.DUPLICATE_SAME_ACCESS)
|
|
return Handle(h)
|
|
|
|
|
|
def _filter_handle_list(self, handle_list):
|
|
"""Filter out console handles that can't be used
|
|
in lpAttributeList["handle_list"] and make sure the list
|
|
isn't empty. This also removes duplicate handles."""
|
|
# An handle with it's lowest two bits set might be a special console
|
|
# handle that if passed in lpAttributeList["handle_list"], will
|
|
# cause it to fail.
|
|
return list({handle for handle in handle_list
|
|
if handle & 0x3 != 0x3
|
|
or _winapi.GetFileType(handle) !=
|
|
_winapi.FILE_TYPE_CHAR})
|
|
|
|
|
|
def _execute_child(self, args, executable, preexec_fn, close_fds,
|
|
pass_fds, cwd, env,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite,
|
|
unused_restore_signals, unused_start_new_session):
|
|
"""Execute program (MS Windows version)"""
|
|
|
|
assert not pass_fds, "pass_fds not supported on Windows."
|
|
|
|
if isinstance(args, str):
|
|
pass
|
|
elif isinstance(args, bytes):
|
|
if shell:
|
|
raise TypeError('bytes args is not allowed on Windows')
|
|
args = list2cmdline([args])
|
|
elif isinstance(args, os.PathLike):
|
|
if shell:
|
|
raise TypeError('path-like args is not allowed when '
|
|
'shell is true')
|
|
args = list2cmdline([args])
|
|
else:
|
|
args = list2cmdline(args)
|
|
|
|
if executable is not None:
|
|
executable = os.fsdecode(executable)
|
|
|
|
# Process startup details
|
|
if startupinfo is None:
|
|
startupinfo = STARTUPINFO()
|
|
else:
|
|
# bpo-34044: Copy STARTUPINFO since it is modified above,
|
|
# so the caller can reuse it multiple times.
|
|
startupinfo = startupinfo.copy()
|
|
|
|
use_std_handles = -1 not in (p2cread, c2pwrite, errwrite)
|
|
if use_std_handles:
|
|
startupinfo.dwFlags |= _winapi.STARTF_USESTDHANDLES
|
|
startupinfo.hStdInput = p2cread
|
|
startupinfo.hStdOutput = c2pwrite
|
|
startupinfo.hStdError = errwrite
|
|
|
|
attribute_list = startupinfo.lpAttributeList
|
|
have_handle_list = bool(attribute_list and
|
|
"handle_list" in attribute_list and
|
|
attribute_list["handle_list"])
|
|
|
|
# If we were given an handle_list or need to create one
|
|
if have_handle_list or (use_std_handles and close_fds):
|
|
if attribute_list is None:
|
|
attribute_list = startupinfo.lpAttributeList = {}
|
|
handle_list = attribute_list["handle_list"] = \
|
|
list(attribute_list.get("handle_list", []))
|
|
|
|
if use_std_handles:
|
|
handle_list += [int(p2cread), int(c2pwrite), int(errwrite)]
|
|
|
|
handle_list[:] = self._filter_handle_list(handle_list)
|
|
|
|
if handle_list:
|
|
if not close_fds:
|
|
warnings.warn("startupinfo.lpAttributeList['handle_list'] "
|
|
"overriding close_fds", RuntimeWarning)
|
|
|
|
# When using the handle_list we always request to inherit
|
|
# handles but the only handles that will be inherited are
|
|
# the ones in the handle_list
|
|
close_fds = False
|
|
|
|
if shell:
|
|
startupinfo.dwFlags |= _winapi.STARTF_USESHOWWINDOW
|
|
startupinfo.wShowWindow = _winapi.SW_HIDE
|
|
comspec = os.environ.get("COMSPEC", "cmd.exe")
|
|
args = '{} /c "{}"'.format (comspec, args)
|
|
|
|
if cwd is not None:
|
|
cwd = os.fsdecode(cwd)
|
|
|
|
sys.audit("subprocess.Popen", executable, args, cwd, env)
|
|
|
|
# Start the process
|
|
try:
|
|
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
|
|
# no special security
|
|
None, None,
|
|
int(not close_fds),
|
|
creationflags,
|
|
env,
|
|
cwd,
|
|
startupinfo)
|
|
finally:
|
|
# Child is launched. Close the parent's copy of those pipe
|
|
# handles that only the child should have open. You need
|
|
# to make sure that no handles to the write end of the
|
|
# output pipe are maintained in this process or else the
|
|
# pipe will not close when the child process exits and the
|
|
# ReadFile will hang.
|
|
self._close_pipe_fds(p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
# Retain the process handle, but close the thread handle
|
|
self._child_created = True
|
|
self._handle = Handle(hp)
|
|
self.pid = pid
|
|
_winapi.CloseHandle(ht)
|
|
|
|
def _internal_poll(self, _deadstate=None,
|
|
_WaitForSingleObject=_winapi.WaitForSingleObject,
|
|
_WAIT_OBJECT_0=_winapi.WAIT_OBJECT_0,
|
|
_GetExitCodeProcess=_winapi.GetExitCodeProcess):
|
|
"""Check if child process has terminated. Returns returncode
|
|
attribute.
|
|
|
|
This method is called by __del__, so it can only refer to objects
|
|
in its local scope.
|
|
|
|
"""
|
|
if self.returncode is None:
|
|
if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0:
|
|
self.returncode = _GetExitCodeProcess(self._handle)
|
|
return self.returncode
|
|
|
|
|
|
def _wait(self, timeout):
|
|
"""Internal implementation of wait() on Windows."""
|
|
if timeout is None:
|
|
timeout_millis = _winapi.INFINITE
|
|
else:
|
|
timeout_millis = int(timeout * 1000)
|
|
if self.returncode is None:
|
|
# API note: Returns immediately if timeout_millis == 0.
|
|
result = _winapi.WaitForSingleObject(self._handle,
|
|
timeout_millis)
|
|
if result == _winapi.WAIT_TIMEOUT:
|
|
raise TimeoutExpired(self.args, timeout)
|
|
self.returncode = _winapi.GetExitCodeProcess(self._handle)
|
|
return self.returncode
|
|
|
|
|
|
def _readerthread(self, fh, buffer):
|
|
buffer.append(fh.read())
|
|
fh.close()
|
|
|
|
|
|
def _communicate(self, input, endtime, orig_timeout):
|
|
# Start reader threads feeding into a list hanging off of this
|
|
# object, unless they've already been started.
|
|
if self.stdout and not hasattr(self, "_stdout_buff"):
|
|
self._stdout_buff = []
|
|
self.stdout_thread = \
|
|
threading.Thread(target=self._readerthread,
|
|
args=(self.stdout, self._stdout_buff))
|
|
self.stdout_thread.daemon = True
|
|
self.stdout_thread.start()
|
|
if self.stderr and not hasattr(self, "_stderr_buff"):
|
|
self._stderr_buff = []
|
|
self.stderr_thread = \
|
|
threading.Thread(target=self._readerthread,
|
|
args=(self.stderr, self._stderr_buff))
|
|
self.stderr_thread.daemon = True
|
|
self.stderr_thread.start()
|
|
|
|
if self.stdin:
|
|
self._stdin_write(input)
|
|
|
|
# Wait for the reader threads, or time out. If we time out, the
|
|
# threads remain reading and the fds left open in case the user
|
|
# calls communicate again.
|
|
if self.stdout is not None:
|
|
self.stdout_thread.join(self._remaining_time(endtime))
|
|
if self.stdout_thread.is_alive():
|
|
raise TimeoutExpired(self.args, orig_timeout)
|
|
if self.stderr is not None:
|
|
self.stderr_thread.join(self._remaining_time(endtime))
|
|
if self.stderr_thread.is_alive():
|
|
raise TimeoutExpired(self.args, orig_timeout)
|
|
|
|
# Collect the output from and close both pipes, now that we know
|
|
# both have been read successfully.
|
|
stdout = None
|
|
stderr = None
|
|
if self.stdout:
|
|
stdout = self._stdout_buff
|
|
self.stdout.close()
|
|
if self.stderr:
|
|
stderr = self._stderr_buff
|
|
self.stderr.close()
|
|
|
|
# All data exchanged. Translate lists into strings.
|
|
if stdout is not None:
|
|
stdout = stdout[0]
|
|
if stderr is not None:
|
|
stderr = stderr[0]
|
|
|
|
return (stdout, stderr)
|
|
|
|
def send_signal(self, sig):
|
|
"""Send a signal to the process."""
|
|
# Don't signal a process that we know has already died.
|
|
if self.returncode is not None:
|
|
return
|
|
if sig == signal.SIGTERM:
|
|
self.terminate()
|
|
elif sig == signal.CTRL_C_EVENT:
|
|
os.kill(self.pid, signal.CTRL_C_EVENT)
|
|
elif sig == signal.CTRL_BREAK_EVENT:
|
|
os.kill(self.pid, signal.CTRL_BREAK_EVENT)
|
|
else:
|
|
raise ValueError("Unsupported signal: {}".format(sig))
|
|
|
|
def terminate(self):
|
|
"""Terminates the process."""
|
|
# Don't terminate a process that we know has already died.
|
|
if self.returncode is not None:
|
|
return
|
|
try:
|
|
_winapi.TerminateProcess(self._handle, 1)
|
|
except PermissionError:
|
|
# ERROR_ACCESS_DENIED (winerror 5) is received when the
|
|
# process already died.
|
|
rc = _winapi.GetExitCodeProcess(self._handle)
|
|
if rc == _winapi.STILL_ACTIVE:
|
|
raise
|
|
self.returncode = rc
|
|
|
|
kill = terminate
|
|
|
|
else:
|
|
#
|
|
# POSIX methods
|
|
#
|
|
def _get_handles(self, stdin, stdout, stderr):
|
|
"""Construct and return tuple with IO objects:
|
|
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
|
|
"""
|
|
p2cread, p2cwrite = -1, -1
|
|
c2pread, c2pwrite = -1, -1
|
|
errread, errwrite = -1, -1
|
|
|
|
if stdin is None:
|
|
pass
|
|
elif stdin == PIPE:
|
|
p2cread, p2cwrite = os.pipe()
|
|
elif stdin == DEVNULL:
|
|
p2cread = self._get_devnull()
|
|
elif isinstance(stdin, int):
|
|
p2cread = stdin
|
|
else:
|
|
# Assuming file-like object
|
|
p2cread = stdin.fileno()
|
|
|
|
if stdout is None:
|
|
pass
|
|
elif stdout == PIPE:
|
|
c2pread, c2pwrite = os.pipe()
|
|
elif stdout == DEVNULL:
|
|
c2pwrite = self._get_devnull()
|
|
elif isinstance(stdout, int):
|
|
c2pwrite = stdout
|
|
else:
|
|
# Assuming file-like object
|
|
c2pwrite = stdout.fileno()
|
|
|
|
if stderr is None:
|
|
pass
|
|
elif stderr == PIPE:
|
|
errread, errwrite = os.pipe()
|
|
elif stderr == STDOUT:
|
|
if c2pwrite != -1:
|
|
errwrite = c2pwrite
|
|
else: # child's stdout is not set, use parent's stdout
|
|
errwrite = sys.__stdout__.fileno()
|
|
elif stderr == DEVNULL:
|
|
errwrite = self._get_devnull()
|
|
elif isinstance(stderr, int):
|
|
errwrite = stderr
|
|
else:
|
|
# Assuming file-like object
|
|
errwrite = stderr.fileno()
|
|
|
|
return (p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
|
|
def _posix_spawn(self, args, executable, env, restore_signals,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite):
|
|
"""Execute program using os.posix_spawn()."""
|
|
if env is None:
|
|
env = os.environ
|
|
|
|
kwargs = {}
|
|
if restore_signals:
|
|
# See _Py_RestoreSignals() in Python/pylifecycle.c
|
|
sigset = []
|
|
for signame in ('SIGPIPE', 'SIGXFZ', 'SIGXFSZ'):
|
|
signum = getattr(signal, signame, None)
|
|
if signum is not None:
|
|
sigset.append(signum)
|
|
kwargs['setsigdef'] = sigset
|
|
|
|
file_actions = []
|
|
for fd in (p2cwrite, c2pread, errread):
|
|
if fd != -1:
|
|
file_actions.append((os.POSIX_SPAWN_CLOSE, fd))
|
|
for fd, fd2 in (
|
|
(p2cread, 0),
|
|
(c2pwrite, 1),
|
|
(errwrite, 2),
|
|
):
|
|
if fd != -1:
|
|
file_actions.append((os.POSIX_SPAWN_DUP2, fd, fd2))
|
|
if file_actions:
|
|
kwargs['file_actions'] = file_actions
|
|
|
|
self.pid = os.posix_spawn(executable, args, env, **kwargs)
|
|
self._child_created = True
|
|
|
|
self._close_pipe_fds(p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
def _execute_child(self, args, executable, preexec_fn, close_fds,
|
|
pass_fds, cwd, env,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite,
|
|
restore_signals, start_new_session):
|
|
"""Execute program (POSIX version)"""
|
|
|
|
if isinstance(args, (str, bytes)):
|
|
args = [args]
|
|
elif isinstance(args, os.PathLike):
|
|
if shell:
|
|
raise TypeError('path-like args is not allowed when '
|
|
'shell is true')
|
|
args = [args]
|
|
else:
|
|
args = list(args)
|
|
|
|
if shell:
|
|
# On Android the default shell is at '/system/bin/sh'.
|
|
unix_shell = ('/system/bin/sh' if
|
|
hasattr(sys, 'getandroidapilevel') else '/bin/sh')
|
|
args = [unix_shell, "-c"] + args
|
|
if executable:
|
|
args[0] = executable
|
|
|
|
if executable is None:
|
|
executable = args[0]
|
|
|
|
sys.audit("subprocess.Popen", executable, args, cwd, env)
|
|
|
|
if (_USE_POSIX_SPAWN
|
|
and os.path.dirname(executable)
|
|
and preexec_fn is None
|
|
and not close_fds
|
|
and not pass_fds
|
|
and cwd is None
|
|
and (p2cread == -1 or p2cread > 2)
|
|
and (c2pwrite == -1 or c2pwrite > 2)
|
|
and (errwrite == -1 or errwrite > 2)
|
|
and not start_new_session):
|
|
self._posix_spawn(args, executable, env, restore_signals,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
return
|
|
|
|
orig_executable = executable
|
|
|
|
# For transferring possible exec failure from child to parent.
|
|
# Data format: "exception name:hex errno:description"
|
|
# Pickle is not used; it is complex and involves memory allocation.
|
|
errpipe_read, errpipe_write = os.pipe()
|
|
# errpipe_write must not be in the standard io 0, 1, or 2 fd range.
|
|
low_fds_to_close = []
|
|
while errpipe_write < 3:
|
|
low_fds_to_close.append(errpipe_write)
|
|
errpipe_write = os.dup(errpipe_write)
|
|
for low_fd in low_fds_to_close:
|
|
os.close(low_fd)
|
|
try:
|
|
try:
|
|
# We must avoid complex work that could involve
|
|
# malloc or free in the child process to avoid
|
|
# potential deadlocks, thus we do all this here.
|
|
# and pass it to fork_exec()
|
|
|
|
if env is not None:
|
|
env_list = []
|
|
for k, v in env.items():
|
|
k = os.fsencode(k)
|
|
if b'=' in k:
|
|
raise ValueError("illegal environment variable name")
|
|
env_list.append(k + b'=' + os.fsencode(v))
|
|
else:
|
|
env_list = None # Use execv instead of execve.
|
|
executable = os.fsencode(executable)
|
|
if os.path.dirname(executable):
|
|
executable_list = (executable,)
|
|
else:
|
|
# This matches the behavior of os._execvpe().
|
|
executable_list = tuple(
|
|
os.path.join(os.fsencode(dir), executable)
|
|
for dir in os.get_exec_path(env))
|
|
fds_to_keep = set(pass_fds)
|
|
fds_to_keep.add(errpipe_write)
|
|
self.pid = _posixsubprocess.fork_exec(
|
|
args, executable_list,
|
|
close_fds, tuple(sorted(map(int, fds_to_keep))),
|
|
cwd, env_list,
|
|
p2cread, p2cwrite, c2pread, c2pwrite,
|
|
errread, errwrite,
|
|
errpipe_read, errpipe_write,
|
|
restore_signals, start_new_session, preexec_fn)
|
|
self._child_created = True
|
|
finally:
|
|
# be sure the FD is closed no matter what
|
|
os.close(errpipe_write)
|
|
|
|
self._close_pipe_fds(p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
# Wait for exec to fail or succeed; possibly raising an
|
|
# exception (limited in size)
|
|
errpipe_data = bytearray()
|
|
while True:
|
|
part = os.read(errpipe_read, 50000)
|
|
errpipe_data += part
|
|
if not part or len(errpipe_data) > 50000:
|
|
break
|
|
finally:
|
|
# be sure the FD is closed no matter what
|
|
os.close(errpipe_read)
|
|
|
|
if errpipe_data:
|
|
try:
|
|
pid, sts = os.waitpid(self.pid, 0)
|
|
if pid == self.pid:
|
|
self._handle_exitstatus(sts)
|
|
else:
|
|
self.returncode = sys.maxsize
|
|
except ChildProcessError:
|
|
pass
|
|
|
|
try:
|
|
exception_name, hex_errno, err_msg = (
|
|
errpipe_data.split(b':', 2))
|
|
# The encoding here should match the encoding
|
|
# written in by the subprocess implementations
|
|
# like _posixsubprocess
|
|
err_msg = err_msg.decode()
|
|
except ValueError:
|
|
exception_name = b'SubprocessError'
|
|
hex_errno = b'0'
|
|
err_msg = 'Bad exception data from child: {!r}'.format(
|
|
bytes(errpipe_data))
|
|
child_exception_type = getattr(
|
|
builtins, exception_name.decode('ascii'),
|
|
SubprocessError)
|
|
if issubclass(child_exception_type, OSError) and hex_errno:
|
|
errno_num = int(hex_errno, 16)
|
|
child_exec_never_called = (err_msg == "noexec")
|
|
if child_exec_never_called:
|
|
err_msg = ""
|
|
# The error must be from chdir(cwd).
|
|
err_filename = cwd
|
|
else:
|
|
err_filename = orig_executable
|
|
if errno_num != 0:
|
|
err_msg = os.strerror(errno_num)
|
|
raise child_exception_type(errno_num, err_msg, err_filename)
|
|
raise child_exception_type(err_msg)
|
|
|
|
|
|
def _handle_exitstatus(self, sts, _WIFSIGNALED=os.WIFSIGNALED,
|
|
_WTERMSIG=os.WTERMSIG, _WIFEXITED=os.WIFEXITED,
|
|
_WEXITSTATUS=os.WEXITSTATUS, _WIFSTOPPED=os.WIFSTOPPED,
|
|
_WSTOPSIG=os.WSTOPSIG):
|
|
"""All callers to this function MUST hold self._waitpid_lock."""
|
|
# This method is called (indirectly) by __del__, so it cannot
|
|
# refer to anything outside of its local scope.
|
|
if _WIFSIGNALED(sts):
|
|
self.returncode = -_WTERMSIG(sts)
|
|
elif _WIFEXITED(sts):
|
|
self.returncode = _WEXITSTATUS(sts)
|
|
elif _WIFSTOPPED(sts):
|
|
self.returncode = -_WSTOPSIG(sts)
|
|
else:
|
|
# Should never happen
|
|
raise SubprocessError("Unknown child exit status!")
|
|
|
|
|
|
def _internal_poll(self, _deadstate=None, _waitpid=os.waitpid,
|
|
_WNOHANG=os.WNOHANG, _ECHILD=errno.ECHILD):
|
|
"""Check if child process has terminated. Returns returncode
|
|
attribute.
|
|
|
|
This method is called by __del__, so it cannot reference anything
|
|
outside of the local scope (nor can any methods it calls).
|
|
|
|
"""
|
|
if self.returncode is None:
|
|
if not self._waitpid_lock.acquire(False):
|
|
# Something else is busy calling waitpid. Don't allow two
|
|
# at once. We know nothing yet.
|
|
return None
|
|
try:
|
|
if self.returncode is not None:
|
|
return self.returncode # Another thread waited.
|
|
pid, sts = _waitpid(self.pid, _WNOHANG)
|
|
if pid == self.pid:
|
|
self._handle_exitstatus(sts)
|
|
except OSError as e:
|
|
if _deadstate is not None:
|
|
self.returncode = _deadstate
|
|
elif e.errno == _ECHILD:
|
|
# This happens if SIGCLD is set to be ignored or
|
|
# waiting for child processes has otherwise been
|
|
# disabled for our process. This child is dead, we
|
|
# can't get the status.
|
|
# http://bugs.python.org/issue15756
|
|
self.returncode = 0
|
|
finally:
|
|
self._waitpid_lock.release()
|
|
return self.returncode
|
|
|
|
|
|
def _try_wait(self, wait_flags):
|
|
"""All callers to this function MUST hold self._waitpid_lock."""
|
|
try:
|
|
(pid, sts) = os.waitpid(self.pid, wait_flags)
|
|
except ChildProcessError:
|
|
# This happens if SIGCLD is set to be ignored or waiting
|
|
# for child processes has otherwise been disabled for our
|
|
# process. This child is dead, we can't get the status.
|
|
pid = self.pid
|
|
sts = 0
|
|
return (pid, sts)
|
|
|
|
|
|
def _wait(self, timeout):
|
|
"""Internal implementation of wait() on POSIX."""
|
|
if self.returncode is not None:
|
|
return self.returncode
|
|
|
|
if timeout is not None:
|
|
endtime = _time() + timeout
|
|
# Enter a busy loop if we have a timeout. This busy loop was
|
|
# cribbed from Lib/threading.py in Thread.wait() at r71065.
|
|
delay = 0.0005 # 500 us -> initial delay of 1 ms
|
|
while True:
|
|
if self._waitpid_lock.acquire(False):
|
|
try:
|
|
if self.returncode is not None:
|
|
break # Another thread waited.
|
|
(pid, sts) = self._try_wait(os.WNOHANG)
|
|
assert pid == self.pid or pid == 0
|
|
if pid == self.pid:
|
|
self._handle_exitstatus(sts)
|
|
break
|
|
finally:
|
|
self._waitpid_lock.release()
|
|
remaining = self._remaining_time(endtime)
|
|
if remaining <= 0:
|
|
raise TimeoutExpired(self.args, timeout)
|
|
delay = min(delay * 2, remaining, .05)
|
|
time.sleep(delay)
|
|
else:
|
|
while self.returncode is None:
|
|
with self._waitpid_lock:
|
|
if self.returncode is not None:
|
|
break # Another thread waited.
|
|
(pid, sts) = self._try_wait(0)
|
|
# Check the pid and loop as waitpid has been known to
|
|
# return 0 even without WNOHANG in odd situations.
|
|
# http://bugs.python.org/issue14396.
|
|
if pid == self.pid:
|
|
self._handle_exitstatus(sts)
|
|
return self.returncode
|
|
|
|
|
|
def _communicate(self, input, endtime, orig_timeout):
|
|
if self.stdin and not self._communication_started:
|
|
# Flush stdio buffer. This might block, if the user has
|
|
# been writing to .stdin in an uncontrolled fashion.
|
|
try:
|
|
self.stdin.flush()
|
|
except BrokenPipeError:
|
|
pass # communicate() must ignore BrokenPipeError.
|
|
if not input:
|
|
try:
|
|
self.stdin.close()
|
|
except BrokenPipeError:
|
|
pass # communicate() must ignore BrokenPipeError.
|
|
|
|
stdout = None
|
|
stderr = None
|
|
|
|
# Only create this mapping if we haven't already.
|
|
if not self._communication_started:
|
|
self._fileobj2output = {}
|
|
if self.stdout:
|
|
self._fileobj2output[self.stdout] = []
|
|
if self.stderr:
|
|
self._fileobj2output[self.stderr] = []
|
|
|
|
if self.stdout:
|
|
stdout = self._fileobj2output[self.stdout]
|
|
if self.stderr:
|
|
stderr = self._fileobj2output[self.stderr]
|
|
|
|
self._save_input(input)
|
|
|
|
if self._input:
|
|
input_view = memoryview(self._input)
|
|
|
|
with _PopenSelector() as selector:
|
|
if self.stdin and input:
|
|
selector.register(self.stdin, selectors.EVENT_WRITE)
|
|
if self.stdout:
|
|
selector.register(self.stdout, selectors.EVENT_READ)
|
|
if self.stderr:
|
|
selector.register(self.stderr, selectors.EVENT_READ)
|
|
|
|
while selector.get_map():
|
|
timeout = self._remaining_time(endtime)
|
|
if timeout is not None and timeout < 0:
|
|
self._check_timeout(endtime, orig_timeout,
|
|
stdout, stderr,
|
|
skip_check_and_raise=True)
|
|
raise RuntimeError( # Impossible :)
|
|
'_check_timeout(..., skip_check_and_raise=True) '
|
|
'failed to raise TimeoutExpired.')
|
|
|
|
ready = selector.select(timeout)
|
|
self._check_timeout(endtime, orig_timeout, stdout, stderr)
|
|
|
|
# XXX Rewrite these to use non-blocking I/O on the file
|
|
# objects; they are no longer using C stdio!
|
|
|
|
for key, events in ready:
|
|
if key.fileobj is self.stdin:
|
|
chunk = input_view[self._input_offset :
|
|
self._input_offset + _PIPE_BUF]
|
|
try:
|
|
self._input_offset += os.write(key.fd, chunk)
|
|
except BrokenPipeError:
|
|
selector.unregister(key.fileobj)
|
|
key.fileobj.close()
|
|
else:
|
|
if self._input_offset >= len(self._input):
|
|
selector.unregister(key.fileobj)
|
|
key.fileobj.close()
|
|
elif key.fileobj in (self.stdout, self.stderr):
|
|
data = os.read(key.fd, 32768)
|
|
if not data:
|
|
selector.unregister(key.fileobj)
|
|
key.fileobj.close()
|
|
self._fileobj2output[key.fileobj].append(data)
|
|
|
|
self.wait(timeout=self._remaining_time(endtime))
|
|
|
|
# All data exchanged. Translate lists into strings.
|
|
if stdout is not None:
|
|
stdout = b''.join(stdout)
|
|
if stderr is not None:
|
|
stderr = b''.join(stderr)
|
|
|
|
# Translate newlines, if requested.
|
|
# This also turns bytes into strings.
|
|
if self.text_mode:
|
|
if stdout is not None:
|
|
stdout = self._translate_newlines(stdout,
|
|
self.stdout.encoding,
|
|
self.stdout.errors)
|
|
if stderr is not None:
|
|
stderr = self._translate_newlines(stderr,
|
|
self.stderr.encoding,
|
|
self.stderr.errors)
|
|
|
|
return (stdout, stderr)
|
|
|
|
|
|
def _save_input(self, input):
|
|
# This method is called from the _communicate_with_*() methods
|
|
# so that if we time out while communicating, we can continue
|
|
# sending input if we retry.
|
|
if self.stdin and self._input is None:
|
|
self._input_offset = 0
|
|
self._input = input
|
|
if input is not None and self.text_mode:
|
|
self._input = self._input.encode(self.stdin.encoding,
|
|
self.stdin.errors)
|
|
|
|
|
|
def send_signal(self, sig):
|
|
"""Send a signal to the process."""
|
|
# Skip signalling a process that we know has already died.
|
|
if self.returncode is None:
|
|
os.kill(self.pid, sig)
|
|
|
|
def terminate(self):
|
|
"""Terminate the process with SIGTERM
|
|
"""
|
|
self.send_signal(signal.SIGTERM)
|
|
|
|
def kill(self):
|
|
"""Kill the process with SIGKILL
|
|
"""
|
|
self.send_signal(signal.SIGKILL)
|