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✍️ Editing: cmd.py

            File: /opt/cloudlinux/venv/lib/python3.11/site-packages/git/cmd.py

            Size: 52.45 KB | 
            Last Modified: 2026-01-20 20:01:48        

# cmd.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
from __future__ import annotations
import re
from contextlib import contextmanager
import io
import logging
import os
import signal
from subprocess import call, Popen, PIPE, DEVNULL
import subprocess
import threading
from textwrap import dedent

from git.compat import (
    defenc,
    force_bytes,
    safe_decode,
    is_posix,
    is_win,
)
from git.exc import CommandError
from git.util import is_cygwin_git, cygpath, expand_path, remove_password_if_present

from .exc import GitCommandError, GitCommandNotFound, UnsafeOptionError, UnsafeProtocolError
from .util import (
    LazyMixin,
    stream_copy,
)

# typing ---------------------------------------------------------------------------

from typing import (
    Any,
    AnyStr,
    BinaryIO,
    Callable,
    Dict,
    IO,
    Iterator,
    List,
    Mapping,
    Sequence,
    TYPE_CHECKING,
    TextIO,
    Tuple,
    Union,
    cast,
    overload,
)

from git.types import PathLike, Literal, TBD

if TYPE_CHECKING:
    from git.repo.base import Repo
    from git.diff import DiffIndex

# ---------------------------------------------------------------------------------

execute_kwargs = {
    "istream",
    "with_extended_output",
    "with_exceptions",
    "as_process",
    "stdout_as_string",
    "output_stream",
    "with_stdout",
    "kill_after_timeout",
    "universal_newlines",
    "shell",
    "env",
    "max_chunk_size",
    "strip_newline_in_stdout",
}

log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())

__all__ = ("Git",)

# ==============================================================================
## @name Utilities
# ------------------------------------------------------------------------------
# Documentation
## @{

def handle_process_output(
    process: "Git.AutoInterrupt" | Popen,
    stdout_handler: Union[
        None,
        Callable[[AnyStr], None],
        Callable[[List[AnyStr]], None],
        Callable[[bytes, "Repo", "DiffIndex"], None],
    ],
    stderr_handler: Union[None, Callable[[AnyStr], None], Callable[[List[AnyStr]], None]],
    finalizer: Union[None, Callable[[Union[subprocess.Popen, "Git.AutoInterrupt"]], None]] = None,
    decode_streams: bool = True,
    kill_after_timeout: Union[None, float] = None,
) -> None:
    """Registers for notifications to learn that process output is ready to read, and dispatches lines to
    the respective line handlers.
    This function returns once the finalizer returns

:return: result of finalizer
    :param process: subprocess.Popen instance
    :param stdout_handler: f(stdout_line_string), or None
    :param stderr_handler: f(stderr_line_string), or None
    :param finalizer: f(proc) - wait for proc to finish
    :param decode_streams:
        Assume stdout/stderr streams are binary and decode them before pushing \
        their contents to handlers.
        Set it to False if `universal_newline == True` (then streams are in text-mode)
        or if decoding must happen later (i.e. for Diffs).
    :param kill_after_timeout:
        float or None, Default = None
        To specify a timeout in seconds for the git command, after which the process
        should be killed.
    """
    # Use 2 "pump" threads and wait for both to finish.
    def pump_stream(
        cmdline: List[str],
        name: str,
        stream: Union[BinaryIO, TextIO],
        is_decode: bool,
        handler: Union[None, Callable[[Union[bytes, str]], None]],
    ) -> None:
        try:
            for line in stream:
                if handler:
                    if is_decode:
                        assert isinstance(line, bytes)
                        line_str = line.decode(defenc)
                        handler(line_str)
                    else:
                        handler(line)

except Exception as ex:
            log.error(f"Pumping {name!r} of cmd({remove_password_if_present(cmdline)}) failed due to: {ex!r}")
            if "I/O operation on closed file" not in str(ex):
                # Only reraise if the error was not due to the stream closing
                raise CommandError([f"<{name}-pump>"] + remove_password_if_present(cmdline), ex) from ex
        finally:
            stream.close()

if hasattr(process, "proc"):
        process = cast("Git.AutoInterrupt", process)
        cmdline: str | Tuple[str, ...] | List[str] = getattr(process.proc, "args", "")
        p_stdout = process.proc.stdout if process.proc else None
        p_stderr = process.proc.stderr if process.proc else None
    else:
        process = cast(Popen, process)
        cmdline = getattr(process, "args", "")
        p_stdout = process.stdout
        p_stderr = process.stderr

if not isinstance(cmdline, (tuple, list)):
        cmdline = cmdline.split()

pumps: List[Tuple[str, IO, Callable[..., None] | None]] = []
    if p_stdout:
        pumps.append(("stdout", p_stdout, stdout_handler))
    if p_stderr:
        pumps.append(("stderr", p_stderr, stderr_handler))

threads: List[threading.Thread] = []

for name, stream, handler in pumps:
        t = threading.Thread(target=pump_stream, args=(cmdline, name, stream, decode_streams, handler))
        t.daemon = True
        t.start()
        threads.append(t)

## FIXME: Why Join??  Will block if `stdin` needs feeding...
    #
    for t in threads:
        t.join(timeout=kill_after_timeout)
        if t.is_alive():
            if isinstance(process, Git.AutoInterrupt):
                process._terminate()
            else:  # Don't want to deal with the other case
                raise RuntimeError(
                    "Thread join() timed out in cmd.handle_process_output()."
                    f" kill_after_timeout={kill_after_timeout} seconds"
                )
            if stderr_handler:
                error_str: Union[str, bytes] = (
                    "error: process killed because it timed out." f" kill_after_timeout={kill_after_timeout} seconds"
                )
                if not decode_streams and isinstance(p_stderr, BinaryIO):
                    #  Assume stderr_handler needs binary input
                    error_str = cast(str, error_str)
                    error_str = error_str.encode()
                # We ignore typing on the next line because mypy does not like
                # the way we inferred that stderr takes str or bytes
                stderr_handler(error_str)  # type: ignore

if finalizer:
        return finalizer(process)
    else:
        return None

def dashify(string: str) -> str:
    return string.replace("_", "-")

def slots_to_dict(self: object, exclude: Sequence[str] = ()) -> Dict[str, Any]:
    return {s: getattr(self, s) for s in self.__slots__ if s not in exclude}

def dict_to_slots_and__excluded_are_none(self: object, d: Mapping[str, Any], excluded: Sequence[str] = ()) -> None:
    for k, v in d.items():
        setattr(self, k, v)
    for k in excluded:
        setattr(self, k, None)

## -- End Utilities -- @}

# value of Windows process creation flag taken from MSDN
CREATE_NO_WINDOW = 0x08000000

## CREATE_NEW_PROCESS_GROUP is needed to allow killing it afterwards,
# see https://docs.python.org/3/library/subprocess.html#subprocess.Popen.send_signal
PROC_CREATIONFLAGS = (
    CREATE_NO_WINDOW | subprocess.CREATE_NEW_PROCESS_GROUP if is_win else 0  # type: ignore[attr-defined]
)  # mypy error if not windows

class Git(LazyMixin):

"""
    The Git class manages communication with the Git binary.

It provides a convenient interface to calling the Git binary, such as in::

g = Git( git_dir )
     g.init()                   # calls 'git init' program
     rval = g.ls_files()        # calls 'git ls-files' program

``Debugging``
        Set the GIT_PYTHON_TRACE environment variable print each invocation
        of the command to stdout.
        Set its value to 'full' to see details about the returned values.
    """

__slots__ = (
        "_working_dir",
        "cat_file_all",
        "cat_file_header",
        "_version_info",
        "_git_options",
        "_persistent_git_options",
        "_environment",
    )

_excluded_ = ("cat_file_all", "cat_file_header", "_version_info")

re_unsafe_protocol = re.compile("(.+)::.+")

def __getstate__(self) -> Dict[str, Any]:
        return slots_to_dict(self, exclude=self._excluded_)

def __setstate__(self, d: Dict[str, Any]) -> None:
        dict_to_slots_and__excluded_are_none(self, d, excluded=self._excluded_)

# CONFIGURATION

git_exec_name = "git"  # default that should work on linux and windows

# Enables debugging of GitPython's git commands
    GIT_PYTHON_TRACE = os.environ.get("GIT_PYTHON_TRACE", False)

# If True, a shell will be used when executing git commands.
    # This should only be desirable on Windows, see https://github.com/gitpython-developers/GitPython/pull/126
    # and check `git/test_repo.py:TestRepo.test_untracked_files()` TC for an example where it is required.
    # Override this value using `Git.USE_SHELL = True`
    USE_SHELL = False

# Provide the full path to the git executable. Otherwise it assumes git is in the path
    _git_exec_env_var = "GIT_PYTHON_GIT_EXECUTABLE"
    _refresh_env_var = "GIT_PYTHON_REFRESH"
    GIT_PYTHON_GIT_EXECUTABLE = None
    # note that the git executable is actually found during the refresh step in
    # the top level __init__

@classmethod
    def refresh(cls, path: Union[None, PathLike] = None) -> bool:
        """This gets called by the refresh function (see the top level
        __init__).
        """
        # discern which path to refresh with
        if path is not None:
            new_git = os.path.expanduser(path)
            new_git = os.path.abspath(new_git)
        else:
            new_git = os.environ.get(cls._git_exec_env_var, cls.git_exec_name)

# keep track of the old and new git executable path
        old_git = cls.GIT_PYTHON_GIT_EXECUTABLE
        cls.GIT_PYTHON_GIT_EXECUTABLE = new_git

# test if the new git executable path is valid

# - a GitCommandNotFound error is spawned by ourselves
        # - a PermissionError is spawned if the git executable provided
        #   cannot be executed for whatever reason

has_git = False
        try:
            cls().version()
            has_git = True
        except (GitCommandNotFound, PermissionError):
            pass

# warn or raise exception if test failed
        if not has_git:
            err = (
                dedent(
                    """\
                Bad git executable.
                The git executable must be specified in one of the following ways:
                    - be included in your $PATH
                    - be set via $%s
                    - explicitly set via git.refresh()
                """
                )
                % cls._git_exec_env_var
            )

# revert to whatever the old_git was
            cls.GIT_PYTHON_GIT_EXECUTABLE = old_git

if old_git is None:
                # on the first refresh (when GIT_PYTHON_GIT_EXECUTABLE is
                # None) we only are quiet, warn, or error depending on the
                # GIT_PYTHON_REFRESH value

# determine what the user wants to happen during the initial
                # refresh we expect GIT_PYTHON_REFRESH to either be unset or
                # be one of the following values:
                #   0|q|quiet|s|silence
                #   1|w|warn|warning
                #   2|r|raise|e|error

mode = os.environ.get(cls._refresh_env_var, "raise").lower()

quiet = ["quiet", "q", "silence", "s", "none", "n", "0"]
                warn = ["warn", "w", "warning", "1"]
                error = ["error", "e", "raise", "r", "2"]

if mode in quiet:
                    pass
                elif mode in warn or mode in error:
                    err = (
                        dedent(
                            """\
                        %s
                        All git commands will error until this is rectified.

This initial warning can be silenced or aggravated in the future by setting the
                        $%s environment variable. Use one of the following values:
                            - %s: for no warning or exception
                            - %s: for a printed warning
                            - %s: for a raised exception

Example:
                            export %s=%s
                        """
                        )
                        % (
                            err,
                            cls._refresh_env_var,
                            "|".join(quiet),
                            "|".join(warn),
                            "|".join(error),
                            cls._refresh_env_var,
                            quiet[0],
                        )
                    )

if mode in warn:
                        print("WARNING: %s" % err)
                    else:
                        raise ImportError(err)
                else:
                    err = (
                        dedent(
                            """\
                        %s environment variable has been set but it has been set with an invalid value.

Use only the following values:
                            - %s: for no warning or exception
                            - %s: for a printed warning
                            - %s: for a raised exception
                        """
                        )
                        % (
                            cls._refresh_env_var,
                            "|".join(quiet),
                            "|".join(warn),
                            "|".join(error),
                        )
                    )
                    raise ImportError(err)

# we get here if this was the init refresh and the refresh mode
                # was not error, go ahead and set the GIT_PYTHON_GIT_EXECUTABLE
                # such that we discern the difference between a first import
                # and a second import
                cls.GIT_PYTHON_GIT_EXECUTABLE = cls.git_exec_name
            else:
                # after the first refresh (when GIT_PYTHON_GIT_EXECUTABLE
                # is no longer None) we raise an exception
                raise GitCommandNotFound("git", err)

return has_git

@classmethod
    def is_cygwin(cls) -> bool:
        return is_cygwin_git(cls.GIT_PYTHON_GIT_EXECUTABLE)

@overload
    @classmethod
    def polish_url(cls, url: str, is_cygwin: Literal[False] = ...) -> str:
        ...

@overload
    @classmethod
    def polish_url(cls, url: str, is_cygwin: Union[None, bool] = None) -> str:
        ...

@classmethod
    def polish_url(cls, url: str, is_cygwin: Union[None, bool] = None) -> PathLike:
        if is_cygwin is None:
            is_cygwin = cls.is_cygwin()

if is_cygwin:
            url = cygpath(url)
        else:
            """Remove any backslahes from urls to be written in config files.

Windows might create config-files containing paths with backslashed,
            but git stops liking them as it will escape the backslashes.
            Hence we undo the escaping just to be sure.
            """
            url = os.path.expandvars(url)
            if url.startswith("~"):
                url = os.path.expanduser(url)
            url = url.replace("\\\\", "\\").replace("\\", "/")
        return url

@classmethod
    def check_unsafe_protocols(cls, url: str) -> None:
        """
        Check for unsafe protocols.

Apart from the usual protocols (http, git, ssh),
        Git allows "remote helpers" that have the form `<transport>::<address>`,
        one of these helpers (`ext::`) can be used to invoke any arbitrary command.

See:

- https://git-scm.com/docs/gitremote-helpers
        - https://git-scm.com/docs/git-remote-ext
        """
        match = cls.re_unsafe_protocol.match(url)
        if match:
            protocol = match.group(1)
            raise UnsafeProtocolError(
                f"The `{protocol}::` protocol looks suspicious, use `allow_unsafe_protocols=True` to allow it."
            )

@classmethod
    def check_unsafe_options(cls, options: List[str], unsafe_options: List[str]) -> None:
        """
        Check for unsafe options.

Some options that are passed to `git <command>` can be used to execute
        arbitrary commands, this are blocked by default.
        """
        # Options can be of the form `foo` or `--foo bar` `--foo=bar`,
        # so we need to check if they start with "--foo" or if they are equal to "foo".
        bare_unsafe_options = [
            option.lstrip("-")
            for option in unsafe_options
        ]
        for option in options:
            for unsafe_option, bare_option in zip(unsafe_options, bare_unsafe_options):
                if option.startswith(unsafe_option) or option == bare_option:
                    raise UnsafeOptionError(
                        f"{unsafe_option} is not allowed, use `allow_unsafe_options=True` to allow it."
                    )

class AutoInterrupt(object):
        """Kill/Interrupt the stored process instance once this instance goes out of scope. It is
        used to prevent processes piling up in case iterators stop reading.
        Besides all attributes are wired through to the contained process object.

The wait method was overridden to perform automatic status code checking
        and possibly raise."""

__slots__ = ("proc", "args", "status")

# If this is non-zero it will override any status code during
        # _terminate, used to prevent race conditions in testing
        _status_code_if_terminate: int = 0

def __init__(self, proc: Union[None, subprocess.Popen], args: Any) -> None:
            self.proc = proc
            self.args = args
            self.status: Union[int, None] = None

def _terminate(self) -> None:
            """Terminate the underlying process"""
            if self.proc is None:
                return

proc = self.proc
            self.proc = None
            if proc.stdin:
                proc.stdin.close()
            if proc.stdout:
                proc.stdout.close()
            if proc.stderr:
                proc.stderr.close()
            # did the process finish already so we have a return code ?
            try:
                if proc.poll() is not None:
                    self.status = self._status_code_if_terminate or proc.poll()
                    return None
            except OSError as ex:
                log.info("Ignored error after process had died: %r", ex)

# can be that nothing really exists anymore ...
            if os is None or getattr(os, "kill", None) is None:
                return None

# try to kill it
            try:
                proc.terminate()
                status = proc.wait()  # ensure process goes away

self.status = self._status_code_if_terminate or status
            except OSError as ex:
                log.info("Ignored error after process had died: %r", ex)
            except AttributeError:
                # try windows
                # for some reason, providing None for stdout/stderr still prints something. This is why
                # we simply use the shell and redirect to nul. Its slower than CreateProcess, question
                # is whether we really want to see all these messages. Its annoying no matter what.
                if is_win:
                    call(
                        ("TASKKILL /F /T /PID %s 2>nul 1>nul" % str(proc.pid)),
                        shell=True,
                    )
            # END exception handling

def __del__(self) -> None:
            self._terminate()

def __getattr__(self, attr: str) -> Any:
            return getattr(self.proc, attr)

# TODO: Bad choice to mimic `proc.wait()` but with different args.
        def wait(self, stderr: Union[None, str, bytes] = b"") -> int:
            """Wait for the process and return its status code.

:param stderr: Previously read value of stderr, in case stderr is already closed.
            :warn: may deadlock if output or error pipes are used and not handled separately.
            :raise GitCommandError: if the return status is not 0"""
            if stderr is None:
                stderr_b = b""
            stderr_b = force_bytes(data=stderr, encoding="utf-8")
            status: Union[int, None]
            if self.proc is not None:
                status = self.proc.wait()
                p_stderr = self.proc.stderr
            else:  # Assume the underlying proc was killed earlier or never existed
                status = self.status
                p_stderr = None

def read_all_from_possibly_closed_stream(stream: Union[IO[bytes], None]) -> bytes:
                if stream:
                    try:
                        return stderr_b + force_bytes(stream.read())
                    except (OSError, ValueError):
                        return stderr_b or b""
                else:
                    return stderr_b or b""

# END status handling

if status != 0:
                errstr = read_all_from_possibly_closed_stream(p_stderr)
                log.debug("AutoInterrupt wait stderr: %r" % (errstr,))
                raise GitCommandError(remove_password_if_present(self.args), status, errstr)
            return status

# END auto interrupt

class CatFileContentStream(object):

"""Object representing a sized read-only stream returning the contents of
        an object.
        It behaves like a stream, but counts the data read and simulates an empty
        stream once our sized content region is empty.
        If not all data is read to the end of the objects's lifetime, we read the
        rest to assure the underlying stream continues to work"""

__slots__: Tuple[str, ...] = ("_stream", "_nbr", "_size")

def __init__(self, size: int, stream: IO[bytes]) -> None:
            self._stream = stream
            self._size = size
            self._nbr = 0  # num bytes read

# special case: if the object is empty, has null bytes, get the
            # final newline right away.
            if size == 0:
                stream.read(1)
            # END handle empty streams

def read(self, size: int = -1) -> bytes:
            bytes_left = self._size - self._nbr
            if bytes_left == 0:
                return b""
            if size > -1:
                # assure we don't try to read past our limit
                size = min(bytes_left, size)
            else:
                # they try to read all, make sure its not more than what remains
                size = bytes_left
            # END check early depletion
            data = self._stream.read(size)
            self._nbr += len(data)

# check for depletion, read our final byte to make the stream usable by others
            if self._size - self._nbr == 0:
                self._stream.read(1)  # final newline
            # END finish reading
            return data

def readline(self, size: int = -1) -> bytes:
            if self._nbr == self._size:
                return b""

# clamp size to lowest allowed value
            bytes_left = self._size - self._nbr
            if size > -1:
                size = min(bytes_left, size)
            else:
                size = bytes_left
            # END handle size

data = self._stream.readline(size)
            self._nbr += len(data)

# handle final byte
            if self._size - self._nbr == 0:
                self._stream.read(1)
            # END finish reading

return data

def readlines(self, size: int = -1) -> List[bytes]:
            if self._nbr == self._size:
                return []

# leave all additional logic to our readline method, we just check the size
            out = []
            nbr = 0
            while True:
                line = self.readline()
                if not line:
                    break
                out.append(line)
                if size > -1:
                    nbr += len(line)
                    if nbr > size:
                        break
                # END handle size constraint
            # END readline loop
            return out

# skipcq: PYL-E0301
        def __iter__(self) -> "Git.CatFileContentStream":
            return self

def __next__(self) -> bytes:
            line = self.readline()
            if not line:
                raise StopIteration

return line

next = __next__

def __del__(self) -> None:
            bytes_left = self._size - self._nbr
            if bytes_left:
                # read and discard - seeking is impossible within a stream
                # includes terminating newline
                self._stream.read(bytes_left + 1)
            # END handle incomplete read

def __init__(self, working_dir: Union[None, PathLike] = None):
        """Initialize this instance with:

:param working_dir:
           Git directory we should work in. If None, we always work in the current
           directory as returned by os.getcwd().
           It is meant to be the working tree directory if available, or the
           .git directory in case of bare repositories."""
        super(Git, self).__init__()
        self._working_dir = expand_path(working_dir)
        self._git_options: Union[List[str], Tuple[str, ...]] = ()
        self._persistent_git_options: List[str] = []

# Extra environment variables to pass to git commands
        self._environment: Dict[str, str] = {}

# cached command slots
        self.cat_file_header: Union[None, TBD] = None
        self.cat_file_all: Union[None, TBD] = None

def __getattr__(self, name: str) -> Any:
        """A convenience method as it allows to call the command as if it was
        an object.

:return: Callable object that will execute call _call_process with your arguments."""
        if name[0] == "_":
            return LazyMixin.__getattr__(self, name)
        return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)

def set_persistent_git_options(self, **kwargs: Any) -> None:
        """Specify command line options to the git executable
        for subsequent subcommand calls

:param kwargs:
            is a dict of keyword arguments.
            these arguments are passed as in _call_process
            but will be passed to the git command rather than
            the subcommand.
        """

self._persistent_git_options = self.transform_kwargs(split_single_char_options=True, **kwargs)

def _set_cache_(self, attr: str) -> None:
        if attr == "_version_info":
            # We only use the first 4 numbers, as everything else could be strings in fact (on windows)
            process_version = self._call_process("version")  # should be as default *args and **kwargs used
            version_numbers = process_version.split(" ")[2]

self._version_info = cast(
                Tuple[int, int, int, int],
                tuple(int(n) for n in version_numbers.split(".")[:4] if n.isdigit()),
            )
        else:
            super(Git, self)._set_cache_(attr)
        # END handle version info

@property
    def working_dir(self) -> Union[None, PathLike]:
        """:return: Git directory we are working on"""
        return self._working_dir

@property
    def version_info(self) -> Tuple[int, int, int, int]:
        """
        :return: tuple(int, int, int, int) tuple with integers representing the major, minor
            and additional version numbers as parsed from git version.
            This value is generated on demand and is cached"""
        return self._version_info

@overload
    def execute(self, command: Union[str, Sequence[Any]], *, as_process: Literal[True]) -> "AutoInterrupt":
        ...

@overload
    def execute(
        self,
        command: Union[str, Sequence[Any]],
        *,
        as_process: Literal[False] = False,
        stdout_as_string: Literal[True],
    ) -> Union[str, Tuple[int, str, str]]:
        ...

@overload
    def execute(
        self,
        command: Union[str, Sequence[Any]],
        *,
        as_process: Literal[False] = False,
        stdout_as_string: Literal[False] = False,
    ) -> Union[bytes, Tuple[int, bytes, str]]:
        ...

@overload
    def execute(
        self,
        command: Union[str, Sequence[Any]],
        *,
        with_extended_output: Literal[False],
        as_process: Literal[False],
        stdout_as_string: Literal[True],
    ) -> str:
        ...

@overload
    def execute(
        self,
        command: Union[str, Sequence[Any]],
        *,
        with_extended_output: Literal[False],
        as_process: Literal[False],
        stdout_as_string: Literal[False],
    ) -> bytes:
        ...

def execute(
        self,
        command: Union[str, Sequence[Any]],
        istream: Union[None, BinaryIO] = None,
        with_extended_output: bool = False,
        with_exceptions: bool = True,
        as_process: bool = False,
        output_stream: Union[None, BinaryIO] = None,
        stdout_as_string: bool = True,
        kill_after_timeout: Union[None, float] = None,
        with_stdout: bool = True,
        universal_newlines: bool = False,
        shell: Union[None, bool] = None,
        env: Union[None, Mapping[str, str]] = None,
        max_chunk_size: int = io.DEFAULT_BUFFER_SIZE,
        strip_newline_in_stdout: bool = True,
        **subprocess_kwargs: Any,
    ) -> Union[str, bytes, Tuple[int, Union[str, bytes], str], AutoInterrupt]:
        """Handles executing the command on the shell and consumes and returns
        the returned information (stdout)

:param command:
            The command argument list to execute.
            It should be a string, or a sequence of program arguments. The
            program to execute is the first item in the args sequence or string.

:param istream:
            Standard input filehandle passed to subprocess.Popen.

:param with_extended_output:
            Whether to return a (status, stdout, stderr) tuple.

:param with_exceptions:
            Whether to raise an exception when git returns a non-zero status.

:param as_process:
            Whether to return the created process instance directly from which
            streams can be read on demand. This will render with_extended_output and
            with_exceptions ineffective - the caller will have
            to deal with the details himself.
            It is important to note that the process will be placed into an AutoInterrupt
            wrapper that will interrupt the process once it goes out of scope. If you
            use the command in iterators, you should pass the whole process instance
            instead of a single stream.

:param output_stream:
            If set to a file-like object, data produced by the git command will be
            output to the given stream directly.
            This feature only has any effect if as_process is False. Processes will
            always be created with a pipe due to issues with subprocess.
            This merely is a workaround as data will be copied from the
            output pipe to the given output stream directly.
            Judging from the implementation, you shouldn't use this flag !

:param stdout_as_string:
            if False, the commands standard output will be bytes. Otherwise, it will be
            decoded into a string using the default encoding (usually utf-8).
            The latter can fail, if the output contains binary data.

:param env:
            A dictionary of environment variables to be passed to `subprocess.Popen`.

:param max_chunk_size:
            Maximum number of bytes in one chunk of data passed to the output_stream in
            one invocation of write() method. If the given number is not positive then
            the default value is used.

:param subprocess_kwargs:
            Keyword arguments to be passed to subprocess.Popen. Please note that
            some of the valid kwargs are already set by this method, the ones you
            specify may not be the same ones.

:param with_stdout: If True, default True, we open stdout on the created process
        :param universal_newlines:
            if True, pipes will be opened as text, and lines are split at
            all known line endings.
        :param shell:
            Whether to invoke commands through a shell (see `Popen(..., shell=True)`).
            It overrides :attr:`USE_SHELL` if it is not `None`.
        :param kill_after_timeout:
            To specify a timeout in seconds for the git command, after which the process
            should be killed. This will have no effect if as_process is set to True. It is
            set to None by default and will let the process run until the timeout is
            explicitly specified. This feature is not supported on Windows. It's also worth
            noting that kill_after_timeout uses SIGKILL, which can have negative side
            effects on a repository. For example, stale locks in case of git gc could
            render the repository incapable of accepting changes until the lock is manually
            removed.
        :param strip_newline_in_stdout:
            Whether to strip the trailing ``\\n`` of the command stdout.
        :return:
            * str(output) if extended_output = False (Default)
            * tuple(int(status), str(stdout), str(stderr)) if extended_output = True

if output_stream is True, the stdout value will be your output stream:
            * output_stream if extended_output = False
            * tuple(int(status), output_stream, str(stderr)) if extended_output = True

Note git is executed with LC_MESSAGES="C" to ensure consistent
            output regardless of system language.

:raise GitCommandError:

:note:
           If you add additional keyword arguments to the signature of this method,
           you must update the execute_kwargs tuple housed in this module."""
        # Remove password for the command if present
        redacted_command = remove_password_if_present(command)
        if self.GIT_PYTHON_TRACE and (self.GIT_PYTHON_TRACE != "full" or as_process):
            log.info(" ".join(redacted_command))

# Allow the user to have the command executed in their working dir.
        try:
            cwd = self._working_dir or os.getcwd()  # type: Union[None, str]
            if not os.access(str(cwd), os.X_OK):
                cwd = None
        except FileNotFoundError:
            cwd = None

# Start the process
        inline_env = env
        env = os.environ.copy()
        # Attempt to force all output to plain ascii english, which is what some parsing code
        # may expect.
        # According to stackoverflow (http://goo.gl/l74GC8), we are setting LANGUAGE as well
        # just to be sure.
        env["LANGUAGE"] = "C"
        env["LC_ALL"] = "C"
        env.update(self._environment)
        if inline_env is not None:
            env.update(inline_env)

if is_win:
            cmd_not_found_exception = OSError
            if kill_after_timeout is not None:
                raise GitCommandError(
                    redacted_command,
                    '"kill_after_timeout" feature is not supported on Windows.',
                )
        else:
            cmd_not_found_exception = FileNotFoundError  # NOQA # exists, flake8 unknown @UndefinedVariable
        # end handle

stdout_sink = PIPE if with_stdout else getattr(subprocess, "DEVNULL", None) or open(os.devnull, "wb")
        istream_ok = "None"
        if istream:
            istream_ok = "<valid stream>"
        log.debug(
            "Popen(%s, cwd=%s, universal_newlines=%s, shell=%s, istream=%s)",
            redacted_command,
            cwd,
            universal_newlines,
            shell,
            istream_ok,
        )
        try:
            proc = Popen(
                command,
                env=env,
                cwd=cwd,
                bufsize=-1,
                stdin=istream or DEVNULL,
                stderr=PIPE,
                stdout=stdout_sink,
                shell=shell is not None and shell or self.USE_SHELL,
                close_fds=is_posix,  # unsupported on windows
                universal_newlines=universal_newlines,
                creationflags=PROC_CREATIONFLAGS,
                **subprocess_kwargs,
            )

except cmd_not_found_exception as err:
            raise GitCommandNotFound(redacted_command, err) from err
        else:
            # replace with a typeguard for Popen[bytes]?
            proc.stdout = cast(BinaryIO, proc.stdout)
            proc.stderr = cast(BinaryIO, proc.stderr)

if as_process:
            return self.AutoInterrupt(proc, command)

def _kill_process(pid: int) -> None:
            """Callback method to kill a process."""
            p = Popen(
                ["ps", "--ppid", str(pid)],
                stdout=PIPE,
                creationflags=PROC_CREATIONFLAGS,
            )
            child_pids = []
            if p.stdout is not None:
                for line in p.stdout:
                    if len(line.split()) > 0:
                        local_pid = (line.split())[0]
                        if local_pid.isdigit():
                            child_pids.append(int(local_pid))
            try:
                # Windows does not have SIGKILL, so use SIGTERM instead
                sig = getattr(signal, "SIGKILL", signal.SIGTERM)
                os.kill(pid, sig)
                for child_pid in child_pids:
                    try:
                        os.kill(child_pid, sig)
                    except OSError:
                        pass
                kill_check.set()  # tell the main routine that the process was killed
            except OSError:
                # It is possible that the process gets completed in the duration after timeout
                # happens and before we try to kill the process.
                pass
            return

# end

if kill_after_timeout is not None:
            kill_check = threading.Event()
            watchdog = threading.Timer(kill_after_timeout, _kill_process, args=(proc.pid,))

# Wait for the process to return
        status = 0
        stdout_value: Union[str, bytes] = b""
        stderr_value: Union[str, bytes] = b""
        newline = "\n" if universal_newlines else b"\n"
        try:
            if output_stream is None:
                if kill_after_timeout is not None:
                    watchdog.start()
                stdout_value, stderr_value = proc.communicate()
                if kill_after_timeout is not None:
                    watchdog.cancel()
                    if kill_check.is_set():
                        stderr_value = 'Timeout: the command "%s" did not complete in %d ' "secs." % (
                            " ".join(redacted_command),
                            kill_after_timeout,
                        )
                        if not universal_newlines:
                            stderr_value = stderr_value.encode(defenc)
                # strip trailing "\n"
                if stdout_value.endswith(newline) and strip_newline_in_stdout:  # type: ignore
                    stdout_value = stdout_value[:-1]
                if stderr_value.endswith(newline):  # type: ignore
                    stderr_value = stderr_value[:-1]

status = proc.returncode
            else:
                max_chunk_size = max_chunk_size if max_chunk_size and max_chunk_size > 0 else io.DEFAULT_BUFFER_SIZE
                stream_copy(proc.stdout, output_stream, max_chunk_size)
                stdout_value = proc.stdout.read()
                stderr_value = proc.stderr.read()
                # strip trailing "\n"
                if stderr_value.endswith(newline):  # type: ignore
                    stderr_value = stderr_value[:-1]
                status = proc.wait()
            # END stdout handling
        finally:
            proc.stdout.close()
            proc.stderr.close()

if self.GIT_PYTHON_TRACE == "full":
            cmdstr = " ".join(redacted_command)

def as_text(stdout_value: Union[bytes, str]) -> str:
                return not output_stream and safe_decode(stdout_value) or "<OUTPUT_STREAM>"

# end

if stderr_value:
                log.info(
                    "%s -> %d; stdout: '%s'; stderr: '%s'",
                    cmdstr,
                    status,
                    as_text(stdout_value),
                    safe_decode(stderr_value),
                )
            elif stdout_value:
                log.info("%s -> %d; stdout: '%s'", cmdstr, status, as_text(stdout_value))
            else:
                log.info("%s -> %d", cmdstr, status)
        # END handle debug printing

if with_exceptions and status != 0:
            raise GitCommandError(redacted_command, status, stderr_value, stdout_value)

if isinstance(stdout_value, bytes) and stdout_as_string:  # could also be output_stream
            stdout_value = safe_decode(stdout_value)

# Allow access to the command's status code
        if with_extended_output:
            return (status, stdout_value, safe_decode(stderr_value))
        else:
            return stdout_value

def environment(self) -> Dict[str, str]:
        return self._environment

def update_environment(self, **kwargs: Any) -> Dict[str, Union[str, None]]:
        """
        Set environment variables for future git invocations. Return all changed
        values in a format that can be passed back into this function to revert
        the changes:

``Examples``::

old_env = self.update_environment(PWD='/tmp')
            self.update_environment(**old_env)

:param kwargs: environment variables to use for git processes
        :return: dict that maps environment variables to their old values
        """
        old_env = {}
        for key, value in kwargs.items():
            # set value if it is None
            if value is not None:
                old_env[key] = self._environment.get(key)
                self._environment[key] = value
            # remove key from environment if its value is None
            elif key in self._environment:
                old_env[key] = self._environment[key]
                del self._environment[key]
        return old_env

@contextmanager
    def custom_environment(self, **kwargs: Any) -> Iterator[None]:
        """
        A context manager around the above ``update_environment`` method to restore the
        environment back to its previous state after operation.

``Examples``::

with self.custom_environment(GIT_SSH='/bin/ssh_wrapper'):
                repo.remotes.origin.fetch()

:param kwargs: see update_environment
        """
        old_env = self.update_environment(**kwargs)
        try:
            yield
        finally:
            self.update_environment(**old_env)

def transform_kwarg(self, name: str, value: Any, split_single_char_options: bool) -> List[str]:
        if len(name) == 1:
            if value is True:
                return ["-%s" % name]
            elif value not in (False, None):
                if split_single_char_options:
                    return ["-%s" % name, "%s" % value]
                else:
                    return ["-%s%s" % (name, value)]
        else:
            if value is True:
                return ["--%s" % dashify(name)]
            elif value is not False and value is not None:
                return ["--%s=%s" % (dashify(name), value)]
        return []

def transform_kwargs(self, split_single_char_options: bool = True, **kwargs: Any) -> List[str]:
        """Transforms Python style kwargs into git command line options."""
        args = []
        for k, v in kwargs.items():
            if isinstance(v, (list, tuple)):
                for value in v:
                    args += self.transform_kwarg(k, value, split_single_char_options)
            else:
                args += self.transform_kwarg(k, v, split_single_char_options)
        return args

@classmethod
    def _unpack_args(cls, arg_list: Sequence[str]) -> List[str]:

outlist = []
        if isinstance(arg_list, (list, tuple)):
            for arg in arg_list:
                outlist.extend(cls._unpack_args(arg))
        else:
            outlist.append(str(arg_list))

return outlist

def __call__(self, **kwargs: Any) -> "Git":
        """Specify command line options to the git executable
        for a subcommand call

:param kwargs:
            is a dict of keyword arguments.
            these arguments are passed as in _call_process
            but will be passed to the git command rather than
            the subcommand.

``Examples``::
            git(work_tree='/tmp').difftool()"""
        self._git_options = self.transform_kwargs(split_single_char_options=True, **kwargs)
        return self

@overload
    def _call_process(self, method: str, *args: None, **kwargs: None) -> str:
        ...  # if no args given, execute called with all defaults

@overload
    def _call_process(
        self,
        method: str,
        istream: int,
        as_process: Literal[True],
        *args: Any,
        **kwargs: Any,
    ) -> "Git.AutoInterrupt":
        ...

@overload
    def _call_process(
        self, method: str, *args: Any, **kwargs: Any
    ) -> Union[str, bytes, Tuple[int, Union[str, bytes], str], "Git.AutoInterrupt"]:
        ...

def _call_process(
        self, method: str, *args: Any, **kwargs: Any
    ) -> Union[str, bytes, Tuple[int, Union[str, bytes], str], "Git.AutoInterrupt"]:
        """Run the given git command with the specified arguments and return
        the result as a String

:param method:
            is the command. Contained "_" characters will be converted to dashes,
            such as in 'ls_files' to call 'ls-files'.

:param args:
            is the list of arguments. If None is included, it will be pruned.
            This allows your commands to call git more conveniently as None
            is realized as non-existent

:param kwargs:
            It contains key-values for the following:
            - the :meth:`execute()` kwds, as listed in :var:`execute_kwargs`;
            - "command options" to be converted by :meth:`transform_kwargs()`;
            - the `'insert_kwargs_after'` key which its value must match one of ``*args``
            and any cmd-options will be appended after the matched arg.

Examples::

git.rev_list('master', max_count=10, header=True)

turns into::

git rev-list max-count 10 --header master

:return: Same as ``execute``
                 if no args given used execute default (esp. as_process = False, stdout_as_string = True)
                 and return str"""
        # Handle optional arguments prior to calling transform_kwargs
        # otherwise these'll end up in args, which is bad.
        exec_kwargs = {k: v for k, v in kwargs.items() if k in execute_kwargs}
        opts_kwargs = {k: v for k, v in kwargs.items() if k not in execute_kwargs}

insert_after_this_arg = opts_kwargs.pop("insert_kwargs_after", None)

# Prepare the argument list

opt_args = self.transform_kwargs(**opts_kwargs)
        ext_args = self._unpack_args([a for a in args if a is not None])

if insert_after_this_arg is None:
            args_list = opt_args + ext_args
        else:
            try:
                index = ext_args.index(insert_after_this_arg)
            except ValueError as err:
                raise ValueError(
                    "Couldn't find argument '%s' in args %s to insert cmd options after"
                    % (insert_after_this_arg, str(ext_args))
                ) from err
            # end handle error
            args_list = ext_args[: index + 1] + opt_args + ext_args[index + 1 :]
        # end handle opts_kwargs

call = [self.GIT_PYTHON_GIT_EXECUTABLE]

# add persistent git options
        call.extend(self._persistent_git_options)

# add the git options, then reset to empty
        # to avoid side_effects
        call.extend(self._git_options)
        self._git_options = ()

call.append(dashify(method))
        call.extend(args_list)

return self.execute(call, **exec_kwargs)

def _parse_object_header(self, header_line: str) -> Tuple[str, str, int]:
        """
        :param header_line:
            <hex_sha> type_string size_as_int

:return: (hex_sha, type_string, size_as_int)

:raise ValueError: if the header contains indication for an error due to
            incorrect input sha"""
        tokens = header_line.split()
        if len(tokens) != 3:
            if not tokens:
                raise ValueError("SHA could not be resolved, git returned: %r" % (header_line.strip()))
            else:
                raise ValueError("SHA %s could not be resolved, git returned: %r" % (tokens[0], header_line.strip()))
            # END handle actual return value
        # END error handling

if len(tokens[0]) != 40:
            raise ValueError("Failed to parse header: %r" % header_line)
        return (tokens[0], tokens[1], int(tokens[2]))

def _prepare_ref(self, ref: AnyStr) -> bytes:
        # required for command to separate refs on stdin, as bytes
        if isinstance(ref, bytes):
            # Assume 40 bytes hexsha - bin-to-ascii for some reason returns bytes, not text
            refstr: str = ref.decode("ascii")
        elif not isinstance(ref, str):
            refstr = str(ref)  # could be ref-object
        else:
            refstr = ref

if not refstr.endswith("\n"):
            refstr += "\n"
        return refstr.encode(defenc)

def _get_persistent_cmd(self, attr_name: str, cmd_name: str, *args: Any, **kwargs: Any) -> "Git.AutoInterrupt":
        cur_val = getattr(self, attr_name)
        if cur_val is not None:
            return cur_val

options = {"istream": PIPE, "as_process": True}
        options.update(kwargs)

cmd = self._call_process(cmd_name, *args, **options)
        setattr(self, attr_name, cmd)
        cmd = cast("Git.AutoInterrupt", cmd)
        return cmd

def __get_object_header(self, cmd: "Git.AutoInterrupt", ref: AnyStr) -> Tuple[str, str, int]:
        if cmd.stdin and cmd.stdout:
            cmd.stdin.write(self._prepare_ref(ref))
            cmd.stdin.flush()
            return self._parse_object_header(cmd.stdout.readline())
        else:
            raise ValueError("cmd stdin was empty")

def get_object_header(self, ref: str) -> Tuple[str, str, int]:
        """Use this method to quickly examine the type and size of the object behind
        the given ref.

:note: The method will only suffer from the costs of command invocation
            once and reuses the command in subsequent calls.

:return: (hexsha, type_string, size_as_int)"""
        cmd = self._get_persistent_cmd("cat_file_header", "cat_file", batch_check=True)
        return self.__get_object_header(cmd, ref)

def get_object_data(self, ref: str) -> Tuple[str, str, int, bytes]:
        """As get_object_header, but returns object data as well

:return: (hexsha, type_string, size_as_int, data_string)
        :note: not threadsafe"""
        hexsha, typename, size, stream = self.stream_object_data(ref)
        data = stream.read(size)
        del stream
        return (hexsha, typename, size, data)

def stream_object_data(self, ref: str) -> Tuple[str, str, int, "Git.CatFileContentStream"]:
        """As get_object_header, but returns the data as a stream

:return: (hexsha, type_string, size_as_int, stream)
        :note: This method is not threadsafe, you need one independent Command instance per thread to be safe !"""
        cmd = self._get_persistent_cmd("cat_file_all", "cat_file", batch=True)
        hexsha, typename, size = self.__get_object_header(cmd, ref)
        cmd_stdout = cmd.stdout if cmd.stdout is not None else io.BytesIO()
        return (hexsha, typename, size, self.CatFileContentStream(size, cmd_stdout))

def clear_cache(self) -> "Git":
        """Clear all kinds of internal caches to release resources.

Currently persistent commands will be interrupted.

:return: self"""
        for cmd in (self.cat_file_all, self.cat_file_header):
            if cmd:
                cmd.__del__()

self.cat_file_all = None
        self.cat_file_header = None
        return self

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