import threading
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from contextlib import contextmanager
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import os
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from os.path import dirname, abspath, join as pjoin
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import shutil
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from subprocess import check_call, check_output, STDOUT
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import sys
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from tempfile import mkdtemp
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from . import compat
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try:
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import importlib.resources as resources
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def _in_proc_script_path():
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return resources.path(__package__, '_in_process.py')
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except ImportError:
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@contextmanager
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def _in_proc_script_path():
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yield pjoin(dirname(abspath(__file__)), '_in_process.py')
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@contextmanager
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def tempdir():
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td = mkdtemp()
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try:
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yield td
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finally:
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shutil.rmtree(td)
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class BackendUnavailable(Exception):
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"""Will be raised if the backend cannot be imported in the hook process."""
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def __init__(self, traceback):
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self.traceback = traceback
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class BackendInvalid(Exception):
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"""Will be raised if the backend is invalid."""
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def __init__(self, backend_name, backend_path, message):
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self.backend_name = backend_name
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self.backend_path = backend_path
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self.message = message
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class HookMissing(Exception):
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"""Will be raised on missing hooks."""
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def __init__(self, hook_name):
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super(HookMissing, self).__init__(hook_name)
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self.hook_name = hook_name
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class UnsupportedOperation(Exception):
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"""May be raised by build_sdist if the backend indicates that it can't."""
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def __init__(self, traceback):
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self.traceback = traceback
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def default_subprocess_runner(cmd, cwd=None, extra_environ=None):
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"""The default method of calling the wrapper subprocess."""
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env = os.environ.copy()
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if extra_environ:
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env.update(extra_environ)
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check_call(cmd, cwd=cwd, env=env)
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def quiet_subprocess_runner(cmd, cwd=None, extra_environ=None):
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"""A method of calling the wrapper subprocess while suppressing output."""
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env = os.environ.copy()
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if extra_environ:
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env.update(extra_environ)
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check_output(cmd, cwd=cwd, env=env, stderr=STDOUT)
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def norm_and_check(source_tree, requested):
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"""Normalise and check a backend path.
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Ensure that the requested backend path is specified as a relative path,
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and resolves to a location under the given source tree.
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Return an absolute version of the requested path.
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"""
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if os.path.isabs(requested):
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raise ValueError("paths must be relative")
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abs_source = os.path.abspath(source_tree)
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abs_requested = os.path.normpath(os.path.join(abs_source, requested))
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# We have to use commonprefix for Python 2.7 compatibility. So we
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# normalise case to avoid problems because commonprefix is a character
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# based comparison :-(
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norm_source = os.path.normcase(abs_source)
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norm_requested = os.path.normcase(abs_requested)
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if os.path.commonprefix([norm_source, norm_requested]) != norm_source:
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raise ValueError("paths must be inside source tree")
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return abs_requested
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class Pep517HookCaller(object):
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"""A wrapper around a source directory to be built with a PEP 517 backend.
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source_dir : The path to the source directory, containing pyproject.toml.
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build_backend : The build backend spec, as per PEP 517, from
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pyproject.toml.
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backend_path : The backend path, as per PEP 517, from pyproject.toml.
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runner : A callable that invokes the wrapper subprocess.
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The 'runner', if provided, must expect the following:
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cmd : a list of strings representing the command and arguments to
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execute, as would be passed to e.g. 'subprocess.check_call'.
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cwd : a string representing the working directory that must be
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used for the subprocess. Corresponds to the provided source_dir.
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extra_environ : a dict mapping environment variable names to values
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which must be set for the subprocess execution.
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"""
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def __init__(
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self,
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source_dir,
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build_backend,
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backend_path=None,
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runner=None,
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):
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if runner is None:
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runner = default_subprocess_runner
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self.source_dir = abspath(source_dir)
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self.build_backend = build_backend
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if backend_path:
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backend_path = [
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norm_and_check(self.source_dir, p) for p in backend_path
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]
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self.backend_path = backend_path
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self._subprocess_runner = runner
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@contextmanager
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def subprocess_runner(self, runner):
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"""A context manager for temporarily overriding the default subprocess
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runner.
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"""
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prev = self._subprocess_runner
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self._subprocess_runner = runner
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try:
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yield
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finally:
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self._subprocess_runner = prev
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def get_requires_for_build_wheel(self, config_settings=None):
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"""Identify packages required for building a wheel
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Returns a list of dependency specifications, e.g.:
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["wheel >= 0.25", "setuptools"]
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This does not include requirements specified in pyproject.toml.
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It returns the result of calling the equivalently named hook in a
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subprocess.
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"""
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return self._call_hook('get_requires_for_build_wheel', {
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'config_settings': config_settings
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})
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def prepare_metadata_for_build_wheel(
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self, metadata_directory, config_settings=None,
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_allow_fallback=True):
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"""Prepare a *.dist-info folder with metadata for this project.
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Returns the name of the newly created folder.
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If the build backend defines a hook with this name, it will be called
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in a subprocess. If not, the backend will be asked to build a wheel,
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and the dist-info extracted from that (unless _allow_fallback is
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False).
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"""
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return self._call_hook('prepare_metadata_for_build_wheel', {
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'metadata_directory': abspath(metadata_directory),
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'config_settings': config_settings,
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'_allow_fallback': _allow_fallback,
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})
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def build_wheel(
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self, wheel_directory, config_settings=None,
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metadata_directory=None):
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"""Build a wheel from this project.
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Returns the name of the newly created file.
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In general, this will call the 'build_wheel' hook in the backend.
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However, if that was previously called by
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'prepare_metadata_for_build_wheel', and the same metadata_directory is
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used, the previously built wheel will be copied to wheel_directory.
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"""
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if metadata_directory is not None:
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metadata_directory = abspath(metadata_directory)
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return self._call_hook('build_wheel', {
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'wheel_directory': abspath(wheel_directory),
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'config_settings': config_settings,
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'metadata_directory': metadata_directory,
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})
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def get_requires_for_build_sdist(self, config_settings=None):
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"""Identify packages required for building a wheel
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Returns a list of dependency specifications, e.g.:
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["setuptools >= 26"]
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This does not include requirements specified in pyproject.toml.
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It returns the result of calling the equivalently named hook in a
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subprocess.
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"""
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return self._call_hook('get_requires_for_build_sdist', {
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'config_settings': config_settings
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})
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def build_sdist(self, sdist_directory, config_settings=None):
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"""Build an sdist from this project.
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Returns the name of the newly created file.
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This calls the 'build_sdist' backend hook in a subprocess.
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"""
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return self._call_hook('build_sdist', {
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'sdist_directory': abspath(sdist_directory),
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'config_settings': config_settings,
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})
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def _call_hook(self, hook_name, kwargs):
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# On Python 2, pytoml returns Unicode values (which is correct) but the
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# environment passed to check_call needs to contain string values. We
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# convert here by encoding using ASCII (the backend can only contain
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# letters, digits and _, . and : characters, and will be used as a
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# Python identifier, so non-ASCII content is wrong on Python 2 in
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# any case).
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# For backend_path, we use sys.getfilesystemencoding.
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if sys.version_info[0] == 2:
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build_backend = self.build_backend.encode('ASCII')
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else:
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build_backend = self.build_backend
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extra_environ = {'PEP517_BUILD_BACKEND': build_backend}
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if self.backend_path:
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backend_path = os.pathsep.join(self.backend_path)
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if sys.version_info[0] == 2:
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backend_path = backend_path.encode(sys.getfilesystemencoding())
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extra_environ['PEP517_BACKEND_PATH'] = backend_path
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with tempdir() as td:
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hook_input = {'kwargs': kwargs}
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compat.write_json(hook_input, pjoin(td, 'input.json'),
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indent=2)
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# Run the hook in a subprocess
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with _in_proc_script_path() as script:
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self._subprocess_runner(
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[sys.executable, str(script), hook_name, td],
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cwd=self.source_dir,
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extra_environ=extra_environ
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)
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data = compat.read_json(pjoin(td, 'output.json'))
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if data.get('unsupported'):
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raise UnsupportedOperation(data.get('traceback', ''))
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if data.get('no_backend'):
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raise BackendUnavailable(data.get('traceback', ''))
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if data.get('backend_invalid'):
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raise BackendInvalid(
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backend_name=self.build_backend,
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backend_path=self.backend_path,
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message=data.get('backend_error', '')
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)
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if data.get('hook_missing'):
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raise HookMissing(hook_name)
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return data['return_val']
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class LoggerWrapper(threading.Thread):
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"""
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Read messages from a pipe and redirect them
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to a logger (see python's logging module).
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"""
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def __init__(self, logger, level):
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threading.Thread.__init__(self)
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self.daemon = True
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self.logger = logger
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self.level = level
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# create the pipe and reader
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self.fd_read, self.fd_write = os.pipe()
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self.reader = os.fdopen(self.fd_read)
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self.start()
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def fileno(self):
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return self.fd_write
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@staticmethod
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def remove_newline(msg):
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return msg[:-1] if msg.endswith(os.linesep) else msg
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def run(self):
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for line in self.reader:
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self._write(self.remove_newline(line))
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def _write(self, message):
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self.logger.log(self.level, message)
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