diff options
Diffstat (limited to 'setuptools/build_meta.py')
| -rw-r--r-- | setuptools/build_meta.py | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/setuptools/build_meta.py b/setuptools/build_meta.py index 8e31a04d..e16f319e 100644 --- a/setuptools/build_meta.py +++ b/setuptools/build_meta.py @@ -40,6 +40,7 @@ __all__ = ['get_requires_for_build_sdist', 'prepare_metadata_for_build_wheel', 'build_wheel', 'build_sdist', + 'legacy', 'SetupRequirementsError'] class SetupRequirementsError(BaseException): @@ -187,6 +188,36 @@ class _BuildMetaBackend(object): return _file_with_extension(sdist_directory, '.tar.gz') +class _BuildMetaLegacyBackend(_BuildMetaBackend): + """Compatibility backend for setuptools + + This is a version of setuptools.build_meta that endeavors to maintain backwards + compatibility with pre-PEP 517 modes of invocation. It exists as a temporary + bridge between the old packaging mechanism and the new packaging mechanism, + and will eventually be removed. + """ + def run_setup(self, setup_script='setup.py'): + # In order to maintain compatibility with scripts assuming that + # the setup.py script is in a directory on the PYTHONPATH, inject + # '' into sys.path. (pypa/setuptools#1642) + sys_path = list(sys.path) # Save the original path + + script_dir = os.path.dirname(os.path.abspath(setup_script)) + if script_dir not in sys.path: + sys.path.insert(0, script_dir) + + try: + super(_BuildMetaLegacyBackend, + self).run_setup(setup_script=setup_script) + finally: + # While PEP 517 frontends should be calling each hook in a fresh + # subprocess according to the standard (and thus it should not be + # strictly necessary to restore the old sys.path), we'll restore + # the original path so that the path manipulation does not persist + # within the hook after run_setup is called. + sys.path[:] = sys_path + +# The primary backend _BACKEND = _BuildMetaBackend() get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel @@ -194,3 +225,7 @@ get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel build_wheel = _BACKEND.build_wheel build_sdist = _BACKEND.build_sdist + + +# The legacy backend +legacy = _BuildMetaLegacyBackend() |