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_impl.py
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import json import os import sys import tempfile from contextlib import contextmanager from os.path import abspath from os.path import join as pjoin from subprocess import STDOUT, check_call, check_output from ._in_process import _in_proc_script_path def write_json(obj, path, **kwargs): with open(path, 'w', encoding='utf-8') as f: json.dump(obj, f, **kwargs) def read_json(path): with open(path, encoding='utf-8') as f: return json.load(f) class BackendUnavailable(Exception): """Will be raised if the backend cannot be imported in the hook process.""" def __init__(self, traceback): self.traceback = traceback class BackendInvalid(Exception): """Will be raised if the backend is invalid.""" def __init__(self, backend_name, backend_path, message): super().__init__(message) self.backend_name = backend_name self.backend_path = backend_path class HookMissing(Exception): """Will be raised on missing hooks (if a fallback can't be used).""" def __init__(self, hook_name): super().__init__(hook_name) self.hook_name = hook_name class UnsupportedOperation(Exception): """May be raised by build_sdist if the backend indicates that it can't.""" def __init__(self, traceback): self.traceback = traceback def default_subprocess_runner(cmd, cwd=None, extra_environ=None): """The default method of calling the wrapper subprocess. This uses :func:`subprocess.check_call` under the hood. """ env = os.environ.copy() if extra_environ: env.update(extra_environ) check_call(cmd, cwd=cwd, env=env) def quiet_subprocess_runner(cmd, cwd=None, extra_environ=None): """Call the subprocess while suppressing output. This uses :func:`subprocess.check_output` under the hood. """ env = os.environ.copy() if extra_environ: env.update(extra_environ) check_output(cmd, cwd=cwd, env=env, stderr=STDOUT) def norm_and_check(source_tree, requested): """Normalise and check a backend path. Ensure that the requested backend path is specified as a relative path, and resolves to a location under the given source tree. Return an absolute version of the requested path. """ if os.path.isabs(requested): raise ValueError("paths must be relative") abs_source = os.path.abspath(source_tree) abs_requested = os.path.normpath(os.path.join(abs_source, requested)) # We have to use commonprefix for Python 2.7 compatibility. So we # normalise case to avoid problems because commonprefix is a character # based comparison :-( norm_source = os.path.normcase(abs_source) norm_requested = os.path.normcase(abs_requested) if os.path.commonprefix([norm_source, norm_requested]) != norm_source: raise ValueError("paths must be inside source tree") return abs_requested class BuildBackendHookCaller: """A wrapper to call the build backend hooks for a source directory. """ def __init__( self, source_dir, build_backend, backend_path=None, runner=None, python_executable=None, ): """ :param source_dir: The source directory to invoke the build backend for :param build_backend: The build backend spec :param backend_path: Additional path entries for the build backend spec :param runner: The :ref:`subprocess runner <Subprocess Runners>` to use :param python_executable: The Python executable used to invoke the build backend """ if runner is None: runner = default_subprocess_runner self.source_dir = abspath(source_dir) self.build_backend = build_backend if backend_path: backend_path = [ norm_and_check(self.source_dir, p) for p in backend_path ] self.backend_path = backend_path self._subprocess_runner = runner if not python_executable: python_executable = sys.executable self.python_executable = python_executable @contextmanager def subprocess_runner(self, runner): """A context manager for temporarily overriding the default :ref:`subprocess runner <Subprocess Runners>`. .. code-block:: python hook_caller = BuildBackendHookCaller(...) with hook_caller.subprocess_runner(quiet_subprocess_runner): ... """ prev = self._subprocess_runner self._subprocess_runner = runner try: yield finally: self._subprocess_runner = prev def _supported_features(self): """Return the list of optional features supported by the backend.""" return self._call_hook('_supported_features', {}) def get_requires_for_build_wheel(self, config_settings=None): """Get additional dependencies required for building a wheel. :returns: A list of :pep:`dependency specifiers <508>`. :rtype: list[str] .. admonition:: Fallback If the build backend does not defined a hook with this name, an empty list will be returned. """ return self._call_hook('get_requires_for_build_wheel', { 'config_settings': config_settings }) def prepare_metadata_for_build_wheel( self, metadata_directory, config_settings=None, _allow_fallback=True): """Prepare a ``*.dist-info`` folder with metadata for this project. :returns: Name of the newly created subfolder within ``metadata_directory``, containing the metadata. :rtype: str .. admonition:: Fallback If the build backend does not define a hook with this name and ``_allow_fallback`` is truthy, the backend will be asked to build a wheel via the ``build_wheel`` hook and the dist-info extracted from that will be returned. """ return self._call_hook('prepare_metadata_for_build_wheel', { 'metadata_directory': abspath(metadata_directory), 'config_settings': config_settings, '_allow_fallback': _allow_fallback, }) def build_wheel( self, wheel_directory, config_settings=None, metadata_directory=None): """Build a wheel from this project. :returns: The name of the newly created wheel within ``wheel_directory``. .. admonition:: Interaction with fallback If the ``build_wheel`` hook was called in the fallback for :meth:`prepare_metadata_for_build_wheel`, the build backend would not be invoked. Instead, the previously built wheel will be copied to ``wheel_directory`` and the name of that file will be returned. """ if metadata_directory is not None: metadata_directory = abspath(metadata_directory) return self._call_hook('build_wheel', { 'wheel_directory': abspath(wheel_directory), 'config_settings': config_settings, 'metadata_directory': metadata_directory, }) def get_requires_for_build_editable(self, config_settings=None): """Get additional dependencies required for building an editable wheel. :returns: A list of :pep:`dependency specifiers <508>`. :rtype: list[str] .. admonition:: Fallback If the build backend does not defined a hook with this name, an empty list will be returned. """ return self._call_hook('get_requires_for_build_editable', { 'config_settings': config_settings }) def prepare_metadata_for_build_editable( self, metadata_directory, config_settings=None, _allow_fallback=True): """Prepare a ``*.dist-info`` folder with metadata for this project. :returns: Name of the newly created subfolder within ``metadata_directory``, containing the metadata. :rtype: str .. admonition:: Fallback If the build backend does not define a hook with this name and ``_allow_fallback`` is truthy, the backend will be asked to build a wheel via the ``build_editable`` hook and the dist-info extracted from that will be returned. """ return self._call_hook('prepare_metadata_for_build_editable', { 'metadata_directory': abspath(metadata_directory), 'config_settings': config_settings, '_allow_fallback': _allow_fallback, }) def build_editable( self, wheel_directory, config_settings=None, metadata_directory=None): """Build an editable wheel from this project. :returns: The name of the newly created wheel within ``wheel_directory``. .. admonition:: Interaction with fallback If the ``build_editable`` hook was called in the fallback for :meth:`prepare_metadata_for_build_editable`, the build backend would not be invoked. Instead, the previously built wheel will be copied to ``wheel_directory`` and the name of that file will be returned. """ if metadata_directory is not None: metadata_directory = abspath(metadata_directory) return self._call_hook('build_editable', { 'wheel_directory': abspath(wheel_directory), 'config_settings': config_settings, 'metadata_directory': metadata_directory, }) def get_requires_for_build_sdist(self, config_settings=None): """Get additional dependencies required for building an sdist. :returns: A list of :pep:`dependency specifiers <508>`. :rtype: list[str] """ return self._call_hook('get_requires_for_build_sdist', { 'config_settings': config_settings }) def build_sdist(self, sdist_directory, config_settings=None): """Build an sdist from this project. :returns: The name of the newly created sdist within ``wheel_directory``. """ return self._call_hook('build_sdist', { 'sdist_directory': abspath(sdist_directory), 'config_settings': config_settings, }) def _call_hook(self, hook_name, kwargs): extra_environ = {'PEP517_BUILD_BACKEND': self.build_backend} if self.backend_path: backend_path = os.pathsep.join(self.backend_path) extra_environ['PEP517_BACKEND_PATH'] = backend_path with tempfile.TemporaryDirectory() as td: hook_input = {'kwargs': kwargs} write_json(hook_input, pjoin(td, 'input.json'), indent=2) # Run the hook in a subprocess with _in_proc_script_path() as script: python = self.python_executable self._subprocess_runner( [python, abspath(str(script)), hook_name, td], cwd=self.source_dir, extra_environ=extra_environ ) data = read_json(pjoin(td, 'output.json')) if data.get('unsupported'): raise UnsupportedOperation(data.get('traceback', '')) if data.get('no_backend'): raise BackendUnavailable(data.get('traceback', '')) if data.get('backend_invalid'): raise BackendInvalid( backend_name=self.build_backend, backend_path=self.backend_path, message=data.get('backend_error', '') ) if data.get('hook_missing'): raise HookMissing(data.get('missing_hook_name') or hook_name) return data['return_val']