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Diffstat (limited to 'venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/pep517/wrappers.py')
| -rw-r--r-- | venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/pep517/wrappers.py | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/pep517/wrappers.py b/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/pep517/wrappers.py deleted file mode 100644 index b14b899..0000000 --- a/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/pep517/wrappers.py +++ /dev/null @@ -1,163 +0,0 @@ -from contextlib import contextmanager -import os -from os.path import dirname, abspath, join as pjoin -import shutil -from subprocess import check_call -import sys -from tempfile import mkdtemp - -from . import compat - -_in_proc_script = pjoin(dirname(abspath(__file__)), '_in_process.py') - - -@contextmanager -def tempdir(): - td = mkdtemp() - try: - yield td - finally: - shutil.rmtree(td) - - -class BackendUnavailable(Exception): - """Will be raised if the backend cannot be imported in the hook process.""" - - -class UnsupportedOperation(Exception): - """May be raised by build_sdist if the backend indicates that it can't.""" - - -def default_subprocess_runner(cmd, cwd=None, extra_environ=None): - """The default method of calling the wrapper subprocess.""" - env = os.environ.copy() - if extra_environ: - env.update(extra_environ) - - check_call(cmd, cwd=cwd, env=env) - - -class Pep517HookCaller(object): - """A wrapper around a source directory to be built with a PEP 517 backend. - - source_dir : The path to the source directory, containing pyproject.toml. - backend : The build backend spec, as per PEP 517, from pyproject.toml. - """ - def __init__(self, source_dir, build_backend): - self.source_dir = abspath(source_dir) - self.build_backend = build_backend - self._subprocess_runner = default_subprocess_runner - - # TODO: Is this over-engineered? Maybe frontends only need to - # set this when creating the wrapper, not on every call. - @contextmanager - def subprocess_runner(self, runner): - prev = self._subprocess_runner - self._subprocess_runner = runner - yield - self._subprocess_runner = prev - - def get_requires_for_build_wheel(self, config_settings=None): - """Identify packages required for building a wheel - - Returns a list of dependency specifications, e.g.: - ["wheel >= 0.25", "setuptools"] - - This does not include requirements specified in pyproject.toml. - It returns the result of calling the equivalently named hook in a - subprocess. - """ - 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): - """Prepare a *.dist-info folder with metadata for this project. - - Returns the name of the newly created folder. - - If the build backend defines a hook with this name, it will be called - in a subprocess. If not, the backend will be asked to build a wheel, - and the dist-info extracted from that. - """ - return self._call_hook('prepare_metadata_for_build_wheel', { - 'metadata_directory': abspath(metadata_directory), - 'config_settings': config_settings, - }) - - 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 file. - - In general, this will call the 'build_wheel' hook in the backend. - However, if that was previously called by - 'prepare_metadata_for_build_wheel', and the same metadata_directory is - used, the previously built wheel will be copied to wheel_directory. - """ - 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_sdist(self, config_settings=None): - """Identify packages required for building a wheel - - Returns a list of dependency specifications, e.g.: - ["setuptools >= 26"] - - This does not include requirements specified in pyproject.toml. - It returns the result of calling the equivalently named hook in a - subprocess. - """ - 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 file. - - This calls the 'build_sdist' backend hook in a subprocess. - """ - return self._call_hook('build_sdist', { - 'sdist_directory': abspath(sdist_directory), - 'config_settings': config_settings, - }) - - def _call_hook(self, hook_name, kwargs): - # On Python 2, pytoml returns Unicode values (which is correct) but the - # environment passed to check_call needs to contain string values. We - # convert here by encoding using ASCII (the backend can only contain - # letters, digits and _, . and : characters, and will be used as a - # Python identifier, so non-ASCII content is wrong on Python 2 in - # any case). - if sys.version_info[0] == 2: - build_backend = self.build_backend.encode('ASCII') - else: - build_backend = self.build_backend - - with tempdir() as td: - compat.write_json({'kwargs': kwargs}, pjoin(td, 'input.json'), - indent=2) - - # Run the hook in a subprocess - self._subprocess_runner( - [sys.executable, _in_proc_script, hook_name, td], - cwd=self.source_dir, - extra_environ={'PEP517_BUILD_BACKEND': build_backend} - ) - - data = compat.read_json(pjoin(td, 'output.json')) - if data.get('unsupported'): - raise UnsupportedOperation - if data.get('no_backend'): - raise BackendUnavailable - return data['return_val'] |