diff options
Diffstat (limited to 'setuptools/build_meta.py')
| -rw-r--r-- | setuptools/build_meta.py | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/setuptools/build_meta.py b/setuptools/build_meta.py index 46266814..37132187 100644 --- a/setuptools/build_meta.py +++ b/setuptools/build_meta.py @@ -75,6 +75,22 @@ class Distribution(setuptools.dist.Distribution): distutils.core.Distribution = orig +@contextlib.contextmanager +def no_install_setup_requires(): + """Temporarily disable installing setup_requires + + Under PEP 517, the backend reports build dependencies to the frontend, + and the frontend is responsible for ensuring they're installed. + So setuptools (acting as a backend) should not try to install them. + """ + orig = setuptools._install_setup_requires + setuptools._install_setup_requires = lambda attrs: None + try: + yield + finally: + setuptools._install_setup_requires = orig + + def _to_str(s): """ Convert a filename to a string (on Python 2, explicitly @@ -154,7 +170,8 @@ class _BuildMetaBackend(object): config_settings=None): sys.argv = sys.argv[:1] + ['dist_info', '--egg-base', _to_str(metadata_directory)] - self.run_setup() + with no_install_setup_requires(): + self.run_setup() dist_info_directory = metadata_directory while True: @@ -194,7 +211,8 @@ class _BuildMetaBackend(object): sys.argv = (sys.argv[:1] + setup_command + ['--dist-dir', tmp_dist_dir] + config_settings["--global-option"]) - self.run_setup() + with no_install_setup_requires(): + self.run_setup() result_basename = _file_with_extension( tmp_dist_dir, result_extension) |