379 lines
13 KiB
Python
379 lines
13 KiB
Python
"""Tools for managing kernel specs"""
|
|
|
|
# Copyright (c) Jupyter Development Team.
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
import errno
|
|
import io
|
|
import json
|
|
import os
|
|
import re
|
|
import shutil
|
|
import warnings
|
|
|
|
pjoin = os.path.join
|
|
|
|
from traitlets import (
|
|
HasTraits, List, Unicode, Dict, Set, Bool, Type, CaselessStrEnum
|
|
)
|
|
from traitlets.config import LoggingConfigurable
|
|
|
|
from jupyter_core.paths import jupyter_data_dir, jupyter_path, SYSTEM_JUPYTER_PATH
|
|
|
|
|
|
NATIVE_KERNEL_NAME = 'python3'
|
|
|
|
|
|
class KernelSpec(HasTraits):
|
|
argv = List()
|
|
display_name = Unicode()
|
|
language = Unicode()
|
|
env = Dict()
|
|
resource_dir = Unicode()
|
|
interrupt_mode = CaselessStrEnum(
|
|
['message', 'signal'], default_value='signal'
|
|
)
|
|
metadata = Dict()
|
|
|
|
@classmethod
|
|
def from_resource_dir(cls, resource_dir):
|
|
"""Create a KernelSpec object by reading kernel.json
|
|
|
|
Pass the path to the *directory* containing kernel.json.
|
|
"""
|
|
kernel_file = pjoin(resource_dir, 'kernel.json')
|
|
with io.open(kernel_file, 'r', encoding='utf-8') as f:
|
|
kernel_dict = json.load(f)
|
|
return cls(resource_dir=resource_dir, **kernel_dict)
|
|
|
|
def to_dict(self):
|
|
d = dict(argv=self.argv,
|
|
env=self.env,
|
|
display_name=self.display_name,
|
|
language=self.language,
|
|
interrupt_mode=self.interrupt_mode,
|
|
metadata=self.metadata,
|
|
)
|
|
|
|
return d
|
|
|
|
def to_json(self):
|
|
"""Serialise this kernelspec to a JSON object.
|
|
|
|
Returns a string.
|
|
"""
|
|
return json.dumps(self.to_dict())
|
|
|
|
|
|
_kernel_name_pat = re.compile(r'^[a-z0-9._\-]+$', re.IGNORECASE)
|
|
|
|
def _is_valid_kernel_name(name):
|
|
"""Check that a kernel name is valid."""
|
|
# quote is not unicode-safe on Python 2
|
|
return _kernel_name_pat.match(name)
|
|
|
|
|
|
_kernel_name_description = "Kernel names can only contain ASCII letters and numbers and these separators:" \
|
|
" - . _ (hyphen, period, and underscore)."
|
|
|
|
|
|
def _is_kernel_dir(path):
|
|
"""Is ``path`` a kernel directory?"""
|
|
return os.path.isdir(path) and os.path.isfile(pjoin(path, 'kernel.json'))
|
|
|
|
|
|
def _list_kernels_in(dir):
|
|
"""Return a mapping of kernel names to resource directories from dir.
|
|
|
|
If dir is None or does not exist, returns an empty dict.
|
|
"""
|
|
if dir is None or not os.path.isdir(dir):
|
|
return {}
|
|
kernels = {}
|
|
for f in os.listdir(dir):
|
|
path = pjoin(dir, f)
|
|
if not _is_kernel_dir(path):
|
|
continue
|
|
key = f.lower()
|
|
if not _is_valid_kernel_name(key):
|
|
warnings.warn("Invalid kernelspec directory name (%s): %s"
|
|
% (_kernel_name_description, path), stacklevel=3,
|
|
)
|
|
kernels[key] = path
|
|
return kernels
|
|
|
|
|
|
class NoSuchKernel(KeyError):
|
|
def __init__(self, name):
|
|
self.name = name
|
|
|
|
def __str__(self):
|
|
return "No such kernel named {}".format(self.name)
|
|
|
|
|
|
class KernelSpecManager(LoggingConfigurable):
|
|
|
|
kernel_spec_class = Type(KernelSpec, config=True,
|
|
help="""The kernel spec class. This is configurable to allow
|
|
subclassing of the KernelSpecManager for customized behavior.
|
|
"""
|
|
)
|
|
|
|
ensure_native_kernel = Bool(True, config=True,
|
|
help="""If there is no Python kernelspec registered and the IPython
|
|
kernel is available, ensure it is added to the spec list.
|
|
"""
|
|
)
|
|
|
|
data_dir = Unicode()
|
|
def _data_dir_default(self):
|
|
return jupyter_data_dir()
|
|
|
|
user_kernel_dir = Unicode()
|
|
def _user_kernel_dir_default(self):
|
|
return pjoin(self.data_dir, 'kernels')
|
|
|
|
whitelist = Set(config=True,
|
|
help="""Whitelist of allowed kernel names.
|
|
|
|
By default, all installed kernels are allowed.
|
|
"""
|
|
)
|
|
kernel_dirs = List(
|
|
help="List of kernel directories to search. Later ones take priority over earlier."
|
|
)
|
|
def _kernel_dirs_default(self):
|
|
dirs = jupyter_path('kernels')
|
|
# At some point, we should stop adding .ipython/kernels to the path,
|
|
# but the cost to keeping it is very small.
|
|
try:
|
|
from IPython.paths import get_ipython_dir
|
|
except ImportError:
|
|
try:
|
|
from IPython.utils.path import get_ipython_dir
|
|
except ImportError:
|
|
# no IPython, no ipython dir
|
|
get_ipython_dir = None
|
|
if get_ipython_dir is not None:
|
|
dirs.append(os.path.join(get_ipython_dir(), 'kernels'))
|
|
return dirs
|
|
|
|
def find_kernel_specs(self):
|
|
"""Returns a dict mapping kernel names to resource directories."""
|
|
d = {}
|
|
for kernel_dir in self.kernel_dirs:
|
|
kernels = _list_kernels_in(kernel_dir)
|
|
for kname, spec in kernels.items():
|
|
if kname not in d:
|
|
self.log.debug("Found kernel %s in %s", kname, kernel_dir)
|
|
d[kname] = spec
|
|
|
|
if self.ensure_native_kernel and NATIVE_KERNEL_NAME not in d:
|
|
try:
|
|
from ipykernel.kernelspec import RESOURCES
|
|
self.log.debug("Native kernel (%s) available from %s",
|
|
NATIVE_KERNEL_NAME, RESOURCES)
|
|
d[NATIVE_KERNEL_NAME] = RESOURCES
|
|
except ImportError:
|
|
self.log.warning("Native kernel (%s) is not available", NATIVE_KERNEL_NAME)
|
|
|
|
if self.whitelist:
|
|
# filter if there's a whitelist
|
|
d = {name:spec for name,spec in d.items() if name in self.whitelist}
|
|
return d
|
|
# TODO: Caching?
|
|
|
|
def _get_kernel_spec_by_name(self, kernel_name, resource_dir):
|
|
""" Returns a :class:`KernelSpec` instance for a given kernel_name
|
|
and resource_dir.
|
|
"""
|
|
if kernel_name == NATIVE_KERNEL_NAME:
|
|
try:
|
|
from ipykernel.kernelspec import RESOURCES, get_kernel_dict
|
|
except ImportError:
|
|
# It should be impossible to reach this, but let's play it safe
|
|
pass
|
|
else:
|
|
if resource_dir == RESOURCES:
|
|
return self.kernel_spec_class(resource_dir=resource_dir, **get_kernel_dict())
|
|
|
|
return self.kernel_spec_class.from_resource_dir(resource_dir)
|
|
|
|
def _find_spec_directory(self, kernel_name):
|
|
"""Find the resource directory of a named kernel spec"""
|
|
for kernel_dir in self.kernel_dirs:
|
|
try:
|
|
files = os.listdir(kernel_dir)
|
|
except OSError as e:
|
|
if e.errno in (errno.ENOTDIR, errno.ENOENT):
|
|
continue
|
|
raise
|
|
for f in files:
|
|
path = pjoin(kernel_dir, f)
|
|
if f.lower() == kernel_name and _is_kernel_dir(path):
|
|
return path
|
|
|
|
if kernel_name == NATIVE_KERNEL_NAME:
|
|
try:
|
|
from ipykernel.kernelspec import RESOURCES
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
return RESOURCES
|
|
|
|
def get_kernel_spec(self, kernel_name):
|
|
"""Returns a :class:`KernelSpec` instance for the given kernel_name.
|
|
|
|
Raises :exc:`NoSuchKernel` if the given kernel name is not found.
|
|
"""
|
|
if not _is_valid_kernel_name(kernel_name):
|
|
self.log.warning("Kernelspec name %r is invalid: %s", kernel_name,
|
|
_kernel_name_description)
|
|
|
|
resource_dir = self._find_spec_directory(kernel_name.lower())
|
|
if resource_dir is None:
|
|
raise NoSuchKernel(kernel_name)
|
|
|
|
return self._get_kernel_spec_by_name(kernel_name, resource_dir)
|
|
|
|
def get_all_specs(self):
|
|
"""Returns a dict mapping kernel names to kernelspecs.
|
|
|
|
Returns a dict of the form::
|
|
|
|
{
|
|
'kernel_name': {
|
|
'resource_dir': '/path/to/kernel_name',
|
|
'spec': {"the spec itself": ...}
|
|
},
|
|
...
|
|
}
|
|
"""
|
|
d = self.find_kernel_specs()
|
|
res = {}
|
|
for kname, resource_dir in d.items():
|
|
try:
|
|
if self.__class__ is KernelSpecManager:
|
|
spec = self._get_kernel_spec_by_name(kname, resource_dir)
|
|
else:
|
|
# avoid calling private methods in subclasses,
|
|
# which may have overridden find_kernel_specs
|
|
# and get_kernel_spec, but not the newer get_all_specs
|
|
spec = self.get_kernel_spec(kname)
|
|
|
|
res[kname] = {
|
|
"resource_dir": resource_dir,
|
|
"spec": spec.to_dict()
|
|
}
|
|
except Exception:
|
|
self.log.warning("Error loading kernelspec %r", kname, exc_info=True)
|
|
return res
|
|
|
|
def remove_kernel_spec(self, name):
|
|
"""Remove a kernel spec directory by name.
|
|
|
|
Returns the path that was deleted.
|
|
"""
|
|
save_native = self.ensure_native_kernel
|
|
try:
|
|
self.ensure_native_kernel = False
|
|
specs = self.find_kernel_specs()
|
|
finally:
|
|
self.ensure_native_kernel = save_native
|
|
spec_dir = specs[name]
|
|
self.log.debug("Removing %s", spec_dir)
|
|
if os.path.islink(spec_dir):
|
|
os.remove(spec_dir)
|
|
else:
|
|
shutil.rmtree(spec_dir)
|
|
return spec_dir
|
|
|
|
def _get_destination_dir(self, kernel_name, user=False, prefix=None):
|
|
if user:
|
|
return os.path.join(self.user_kernel_dir, kernel_name)
|
|
elif prefix:
|
|
return os.path.join(os.path.abspath(prefix), 'share', 'jupyter', 'kernels', kernel_name)
|
|
else:
|
|
return os.path.join(SYSTEM_JUPYTER_PATH[0], 'kernels', kernel_name)
|
|
|
|
|
|
def install_kernel_spec(self, source_dir, kernel_name=None, user=False,
|
|
replace=None, prefix=None):
|
|
"""Install a kernel spec by copying its directory.
|
|
|
|
If ``kernel_name`` is not given, the basename of ``source_dir`` will
|
|
be used.
|
|
|
|
If ``user`` is False, it will attempt to install into the systemwide
|
|
kernel registry. If the process does not have appropriate permissions,
|
|
an :exc:`OSError` will be raised.
|
|
|
|
If ``prefix`` is given, the kernelspec will be installed to
|
|
PREFIX/share/jupyter/kernels/KERNEL_NAME. This can be sys.prefix
|
|
for installation inside virtual or conda envs.
|
|
"""
|
|
source_dir = source_dir.rstrip('/\\')
|
|
if not kernel_name:
|
|
kernel_name = os.path.basename(source_dir)
|
|
kernel_name = kernel_name.lower()
|
|
if not _is_valid_kernel_name(kernel_name):
|
|
raise ValueError("Invalid kernel name %r. %s" % (kernel_name, _kernel_name_description))
|
|
|
|
if user and prefix:
|
|
raise ValueError("Can't specify both user and prefix. Please choose one or the other.")
|
|
|
|
if replace is not None:
|
|
warnings.warn(
|
|
"replace is ignored. Installing a kernelspec always replaces an existing installation",
|
|
DeprecationWarning,
|
|
stacklevel=2,
|
|
)
|
|
|
|
destination = self._get_destination_dir(kernel_name, user=user, prefix=prefix)
|
|
self.log.debug('Installing kernelspec in %s', destination)
|
|
|
|
kernel_dir = os.path.dirname(destination)
|
|
if kernel_dir not in self.kernel_dirs:
|
|
self.log.warning("Installing to %s, which is not in %s. The kernelspec may not be found.",
|
|
kernel_dir, self.kernel_dirs,
|
|
)
|
|
|
|
if os.path.isdir(destination):
|
|
self.log.info('Removing existing kernelspec in %s', destination)
|
|
shutil.rmtree(destination)
|
|
|
|
shutil.copytree(source_dir, destination)
|
|
self.log.info('Installed kernelspec %s in %s', kernel_name, destination)
|
|
return destination
|
|
|
|
def install_native_kernel_spec(self, user=False):
|
|
"""DEPRECATED: Use ipykernel.kenelspec.install"""
|
|
warnings.warn("install_native_kernel_spec is deprecated."
|
|
" Use ipykernel.kernelspec import install.", stacklevel=2)
|
|
from ipykernel.kernelspec import install
|
|
install(self, user=user)
|
|
|
|
|
|
def find_kernel_specs():
|
|
"""Returns a dict mapping kernel names to resource directories."""
|
|
return KernelSpecManager().find_kernel_specs()
|
|
|
|
def get_kernel_spec(kernel_name):
|
|
"""Returns a :class:`KernelSpec` instance for the given kernel_name.
|
|
|
|
Raises KeyError if the given kernel name is not found.
|
|
"""
|
|
return KernelSpecManager().get_kernel_spec(kernel_name)
|
|
|
|
def install_kernel_spec(source_dir, kernel_name=None, user=False, replace=False,
|
|
prefix=None):
|
|
return KernelSpecManager().install_kernel_spec(source_dir, kernel_name,
|
|
user, replace, prefix)
|
|
|
|
install_kernel_spec.__doc__ = KernelSpecManager.install_kernel_spec.__doc__
|
|
|
|
def install_native_kernel_spec(user=False):
|
|
return KernelSpecManager().install_native_kernel_spec(user=user)
|
|
|
|
install_native_kernel_spec.__doc__ = KernelSpecManager.install_native_kernel_spec.__doc__
|