Edit: _core_metadata.py
""" Handling of Core Metadata for Python packages (including reading and writing). See: https://packaging.python.org/en/latest/specifications/core-metadata/ """ import os import stat import textwrap from email import message_from_file from email.message import Message from tempfile import NamedTemporaryFile from typing import Optional, List from distutils.util import rfc822_escape from . import _normalization, _reqs from .extern.packaging.markers import Marker from .extern.packaging.requirements import Requirement from .extern.packaging.version import Version from .warnings import SetuptoolsDeprecationWarning def get_metadata_version(self): mv = getattr(self, 'metadata_version', None) if mv is None: mv = Version('2.1') self.metadata_version = mv return mv def rfc822_unescape(content: str) -> str: """Reverse RFC-822 escaping by removing leading whitespaces from content.""" lines = content.splitlines() if len(lines) == 1: return lines[0].lstrip() return '\n'.join((lines[0].lstrip(), textwrap.dedent('\n'.join(lines[1:])))) def _read_field_from_msg(msg: Message, field: str) -> Optional[str]: """Read Message header field.""" value = msg[field] if value == 'UNKNOWN': return None return value def _read_field_unescaped_from_msg(msg: Message, field: str) -> Optional[str]: """Read Message header field and apply rfc822_unescape.""" value = _read_field_from_msg(msg, field) if value is None: return value return rfc822_unescape(value) def _read_list_from_msg(msg: Message, field: str) -> Optional[List[str]]: """Read Message header field and return all results as list.""" values = msg.get_all(field, None) if values == []: return None return values def _read_payload_from_msg(msg: Message) -> Optional[str]: value = msg.get_payload().strip() if value == 'UNKNOWN' or not value: return None return value def read_pkg_file(self, file): """Reads the metadata values from a file object.""" msg = message_from_file(file) self.metadata_version = Version(msg['metadata-version']) self.name = _read_field_from_msg(msg, 'name') self.version = _read_field_from_msg(msg, 'version') self.description = _read_field_from_msg(msg, 'summary') # we are filling author only. self.author = _read_field_from_msg(msg, 'author') self.maintainer = None self.author_email = _read_field_from_msg(msg, 'author-email') self.maintainer_email = None self.url = _read_field_from_msg(msg, 'home-page') self.download_url = _read_field_from_msg(msg, 'download-url') self.license = _read_field_unescaped_from_msg(msg, 'license') self.long_description = _read_field_unescaped_from_msg(msg, 'description') if self.long_description is None and self.metadata_version >= Version('2.1'): self.long_description = _read_payload_from_msg(msg) self.description = _read_field_from_msg(msg, 'summary') if 'keywords' in msg: self.keywords = _read_field_from_msg(msg, 'keywords').split(',') self.platforms = _read_list_from_msg(msg, 'platform') self.classifiers = _read_list_from_msg(msg, 'classifier') # PEP 314 - these fields only exist in 1.1 if self.metadata_version == Version('1.1'): self.requires = _read_list_from_msg(msg, 'requires') self.provides = _read_list_from_msg(msg, 'provides') self.obsoletes = _read_list_from_msg(msg, 'obsoletes') else: self.requires = None self.provides = None self.obsoletes = None self.license_files = _read_list_from_msg(msg, 'license-file') def single_line(val): """ Quick and dirty validation for Summary pypa/setuptools#1390. """ if '\n' in val: # TODO: Replace with `raise ValueError("newlines not allowed")` # after reviewing #2893. msg = "newlines are not allowed in `summary` and will break in the future" SetuptoolsDeprecationWarning.emit("Invalid config.", msg) # due_date is undefined. Controversial change, there was a lot of push back. val = val.strip().split('\n')[0] return val def write_pkg_info(self, base_dir): """Write the PKG-INFO file into the release tree.""" temp = "" final = os.path.join(base_dir, 'PKG-INFO') try: # Use a temporary file while writing to avoid race conditions # (e.g. `importlib.metadata` reading `.egg-info/PKG-INFO`): with NamedTemporaryFile("w", encoding="utf-8", dir=base_dir, delete=False) as f: temp = f.name self.write_pkg_file(f) permissions = stat.S_IMODE(os.lstat(temp).st_mode) os.chmod(temp, permissions | stat.S_IRGRP | stat.S_IROTH) os.replace(temp, final) # atomic operation. finally: if temp and os.path.exists(temp): os.remove(temp) # Based on Python 3.5 version def write_pkg_file(self, file): # noqa: C901 # is too complex (14) # FIXME """Write the PKG-INFO format data to a file object.""" version = self.get_metadata_version() def write_field(key, value): file.write("%s: %s\n" % (key, value)) write_field('Metadata-Version', str(version)) write_field('Name', self.get_name()) write_field('Version', self.get_version()) summary = self.get_description() if summary: write_field('Summary', single_line(summary)) optional_fields = ( ('Home-page', 'url'), ('Download-URL', 'download_url'), ('Author', 'author'), ('Author-email', 'author_email'), ('Maintainer', 'maintainer'), ('Maintainer-email', 'maintainer_email'), ) for field, attr in optional_fields: attr_val = getattr(self, attr, None) if attr_val is not None: write_field(field, attr_val) license = self.get_license() if license: write_field('License', rfc822_escape(license)) for project_url in self.project_urls.items(): write_field('Project-URL', '%s, %s' % project_url) keywords = ','.join(self.get_keywords()) if keywords: write_field('Keywords', keywords) platforms = self.get_platforms() or [] for platform in platforms: write_field('Platform', platform) self._write_list(file, 'Classifier', self.get_classifiers()) # PEP 314 self._write_list(file, 'Requires', self.get_requires()) self._write_list(file, 'Provides', self.get_provides()) self._write_list(file, 'Obsoletes', self.get_obsoletes()) # Setuptools specific for PEP 345 if hasattr(self, 'python_requires'): write_field('Requires-Python', self.python_requires) # PEP 566 if self.long_description_content_type: write_field('Description-Content-Type', self.long_description_content_type) self._write_list(file, 'License-File', self.license_files or []) _write_requirements(self, file) long_description = self.get_long_description() if long_description: file.write("\n%s" % long_description) if not long_description.endswith("\n"): file.write("\n") def _write_requirements(self, file): for req in _reqs.parse(self.install_requires): file.write(f"Requires-Dist: {req}\n") processed_extras = {} for augmented_extra, reqs in self.extras_require.items(): # Historically, setuptools allows "augmented extras": `<extra>:<condition>` unsafe_extra, _, condition = augmented_extra.partition(":") unsafe_extra = unsafe_extra.strip() extra = _normalization.safe_extra(unsafe_extra) if extra: _write_provides_extra(file, processed_extras, extra, unsafe_extra) for req in _reqs.parse_strings(reqs): r = _include_extra(req, extra, condition.strip()) file.write(f"Requires-Dist: {r}\n") return processed_extras def _include_extra(req: str, extra: str, condition: str) -> Requirement: r = Requirement(req) # create a fresh object that can be modified parts = ( f"({r.marker})" if r.marker else None, f"({condition})" if condition else None, f"extra == {extra!r}" if extra else None, ) r.marker = Marker(" and ".join(x for x in parts if x)) return r def _write_provides_extra(file, processed_extras, safe, unsafe): previous = processed_extras.get(safe) if previous == unsafe: SetuptoolsDeprecationWarning.emit( 'Ambiguity during "extra" normalization for dependencies.', f""" {previous!r} and {unsafe!r} normalize to the same value:\n {safe!r}\n In future versions, setuptools might halt the build process. """, see_url="https://peps.python.org/pep-0685/", ) else: processed_extras[safe] = unsafe file.write(f"Provides-Extra: {safe}\n")
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