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294 lines
9.6 KiB
Python
294 lines
9.6 KiB
Python
"""The IPython kernel spec for Jupyter"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import annotations
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import errno
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import json
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import os
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import platform
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import shutil
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import stat
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import sys
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import tempfile
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from pathlib import Path
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from typing import Any
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from jupyter_client.kernelspec import KernelSpecManager
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from traitlets import Unicode
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from traitlets.config import Application
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pjoin = os.path.join
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KERNEL_NAME = "python%i" % sys.version_info[0]
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# path to kernelspec resources
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RESOURCES = pjoin(Path(__file__).parent, "resources")
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def make_ipkernel_cmd(
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mod: str = "ipykernel_launcher",
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executable: str | None = None,
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extra_arguments: list[str] | None = None,
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python_arguments: list[str] | None = None,
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) -> list[str]:
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"""Build Popen command list for launching an IPython kernel.
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Parameters
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----------
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mod : str, optional (default 'ipykernel')
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A string of an IPython module whose __main__ starts an IPython kernel
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executable : str, optional (default sys.executable)
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The Python executable to use for the kernel process.
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extra_arguments : list, optional
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A list of extra arguments to pass when executing the launch code.
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Returns
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-------
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A Popen command list
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"""
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if executable is None:
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executable = sys.executable
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extra_arguments = extra_arguments or []
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python_arguments = python_arguments or []
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return [executable, *python_arguments, "-m", mod, "-f", "{connection_file}", *extra_arguments]
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def get_kernel_dict(
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extra_arguments: list[str] | None = None, python_arguments: list[str] | None = None
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) -> dict[str, Any]:
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"""Construct dict for kernel.json"""
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return {
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"argv": make_ipkernel_cmd(
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extra_arguments=extra_arguments, python_arguments=python_arguments
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),
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"display_name": "Python %i (ipykernel)" % sys.version_info[0],
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"language": "python",
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"metadata": {"debugger": True},
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}
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def write_kernel_spec(
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path: Path | str | None = None,
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overrides: dict[str, Any] | None = None,
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extra_arguments: list[str] | None = None,
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python_arguments: list[str] | None = None,
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) -> str:
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"""Write a kernel spec directory to `path`
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If `path` is not specified, a temporary directory is created.
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If `overrides` is given, the kernelspec JSON is updated before writing.
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The path to the kernelspec is always returned.
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"""
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if path is None:
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path = Path(tempfile.mkdtemp(suffix="_kernels")) / KERNEL_NAME
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# stage resources
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shutil.copytree(RESOURCES, path)
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# ensure path is writable
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mask = Path(path).stat().st_mode
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if not mask & stat.S_IWUSR:
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Path(path).chmod(mask | stat.S_IWUSR)
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# write kernel.json
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kernel_dict = get_kernel_dict(extra_arguments, python_arguments)
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if overrides:
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kernel_dict.update(overrides)
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with open(pjoin(path, "kernel.json"), "w") as f:
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json.dump(kernel_dict, f, indent=1)
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return str(path)
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def install(
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kernel_spec_manager: KernelSpecManager | None = None,
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user: bool = False,
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kernel_name: str = KERNEL_NAME,
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display_name: str | None = None,
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prefix: str | None = None,
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profile: str | None = None,
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env: dict[str, str] | None = None,
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frozen_modules: bool = False,
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) -> str:
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"""Install the IPython kernelspec for Jupyter
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Parameters
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----------
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kernel_spec_manager : KernelSpecManager [optional]
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A KernelSpecManager to use for installation.
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If none provided, a default instance will be created.
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user : bool [default: False]
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Whether to do a user-only install, or system-wide.
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kernel_name : str, optional
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Specify a name for the kernelspec.
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This is needed for having multiple IPython kernels for different environments.
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display_name : str, optional
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Specify the display name for the kernelspec
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profile : str, optional
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Specify a custom profile to be loaded by the kernel.
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prefix : str, optional
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Specify an install prefix for the kernelspec.
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This is needed to install into a non-default location, such as a conda/virtual-env.
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env : dict, optional
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A dictionary of extra environment variables for the kernel.
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These will be added to the current environment variables before the
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kernel is started
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frozen_modules : bool, optional
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Whether to use frozen modules for potentially faster kernel startup.
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Using frozen modules prevents debugging inside of some built-in
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Python modules, such as io, abc, posixpath, ntpath, or stat.
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The frozen modules are used in CPython for faster interpreter startup.
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Ignored for cPython <3.11 and for other Python implementations.
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Returns
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-------
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The path where the kernelspec was installed.
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"""
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if kernel_spec_manager is None:
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kernel_spec_manager = KernelSpecManager()
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if env is None:
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env = {}
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if (kernel_name != KERNEL_NAME) and (display_name is None):
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# kernel_name is specified and display_name is not
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# default display_name to kernel_name
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display_name = kernel_name
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overrides: dict[str, Any] = {}
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if display_name:
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overrides["display_name"] = display_name
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if profile:
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extra_arguments = ["--profile", profile]
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if not display_name:
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# add the profile to the default display name
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overrides["display_name"] = "Python %i [profile=%s]" % (sys.version_info[0], profile)
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else:
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extra_arguments = None
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python_arguments = None
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# addresses the debugger warning from debugpy about frozen modules
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if sys.version_info >= (3, 11) and platform.python_implementation() == "CPython":
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if not frozen_modules:
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# disable frozen modules
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python_arguments = ["-Xfrozen_modules=off"]
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elif "PYDEVD_DISABLE_FILE_VALIDATION" not in env:
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# user opted-in to have frozen modules, and we warned them about
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# consequences for the - disable the debugger warning
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env["PYDEVD_DISABLE_FILE_VALIDATION"] = "1"
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if env:
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overrides["env"] = env
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path = write_kernel_spec(
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overrides=overrides, extra_arguments=extra_arguments, python_arguments=python_arguments
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)
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dest = kernel_spec_manager.install_kernel_spec(
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path, kernel_name=kernel_name, user=user, prefix=prefix
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)
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# cleanup afterward
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shutil.rmtree(path)
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return dest
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# Entrypoint
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class InstallIPythonKernelSpecApp(Application):
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"""Dummy app wrapping argparse"""
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name = Unicode("ipython-kernel-install")
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def initialize(self, argv: list[str] | None = None) -> None:
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"""Initialize the app."""
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if argv is None:
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argv = sys.argv[1:]
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self.argv = argv
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def start(self) -> None:
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"""Start the app."""
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import argparse
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parser = argparse.ArgumentParser(
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prog=self.name, description="Install the IPython kernel spec."
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)
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parser.add_argument(
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"--user",
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action="store_true",
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help="Install for the current user instead of system-wide",
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)
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parser.add_argument(
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"--name",
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type=str,
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default=KERNEL_NAME,
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help="Specify a name for the kernelspec."
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" This is needed to have multiple IPython kernels at the same time.",
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)
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parser.add_argument(
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"--display-name",
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type=str,
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help="Specify the display name for the kernelspec."
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" This is helpful when you have multiple IPython kernels.",
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)
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parser.add_argument(
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"--profile",
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type=str,
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help="Specify an IPython profile to load. "
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"This can be used to create custom versions of the kernel.",
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)
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parser.add_argument(
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"--prefix",
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type=str,
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help="Specify an install prefix for the kernelspec."
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" This is needed to install into a non-default location, such as a conda/virtual-env.",
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)
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parser.add_argument(
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"--sys-prefix",
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action="store_const",
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const=sys.prefix,
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dest="prefix",
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help="Install to Python's sys.prefix."
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" Shorthand for --prefix='%s'. For use in conda/virtual-envs." % sys.prefix,
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)
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parser.add_argument(
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"--env",
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action="append",
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nargs=2,
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metavar=("ENV", "VALUE"),
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help="Set environment variables for the kernel.",
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)
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parser.add_argument(
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"--frozen_modules",
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action="store_true",
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help="Enable frozen modules for potentially faster startup."
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" This has a downside of preventing the debugger from navigating to certain built-in modules.",
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)
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opts = parser.parse_args(self.argv)
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if opts.env:
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opts.env = dict(opts.env)
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try:
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dest = install(
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user=opts.user,
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kernel_name=opts.name,
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profile=opts.profile,
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prefix=opts.prefix,
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display_name=opts.display_name,
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env=opts.env,
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)
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except OSError as e:
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if e.errno == errno.EACCES:
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print(e, file=sys.stderr)
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if opts.user:
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print("Perhaps you want `sudo` or `--user`?", file=sys.stderr)
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self.exit(1)
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raise
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print(f"Installed kernelspec {opts.name} in {dest}")
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if __name__ == "__main__":
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InstallIPythonKernelSpecApp.launch_instance()
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