95 lines
3 KiB
Python
95 lines
3 KiB
Python
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from __future__ import absolute_import
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import logging
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from email.parser import FeedParser
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from pip._vendor import pkg_resources
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from pip._vendor.packaging import specifiers, version
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from pip._internal.exceptions import NoneMetadataError
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from pip._internal.utils.misc import display_path
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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if MYPY_CHECK_RUNNING:
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from typing import Optional, Tuple
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from email.message import Message
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from pip._vendor.pkg_resources import Distribution
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logger = logging.getLogger(__name__)
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def check_requires_python(requires_python, version_info):
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# type: (Optional[str], Tuple[int, ...]) -> bool
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"""
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Check if the given Python version matches a "Requires-Python" specifier.
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:param version_info: A 3-tuple of ints representing a Python
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major-minor-micro version to check (e.g. `sys.version_info[:3]`).
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:return: `True` if the given Python version satisfies the requirement.
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Otherwise, return `False`.
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:raises InvalidSpecifier: If `requires_python` has an invalid format.
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"""
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if requires_python is None:
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# The package provides no information
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return True
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requires_python_specifier = specifiers.SpecifierSet(requires_python)
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python_version = version.parse('.'.join(map(str, version_info)))
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return python_version in requires_python_specifier
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def get_metadata(dist):
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# type: (Distribution) -> Message
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"""
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:raises NoneMetadataError: if the distribution reports `has_metadata()`
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True but `get_metadata()` returns None.
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"""
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metadata_name = 'METADATA'
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if (isinstance(dist, pkg_resources.DistInfoDistribution) and
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dist.has_metadata(metadata_name)):
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metadata = dist.get_metadata(metadata_name)
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elif dist.has_metadata('PKG-INFO'):
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metadata_name = 'PKG-INFO'
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metadata = dist.get_metadata(metadata_name)
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else:
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logger.warning("No metadata found in %s", display_path(dist.location))
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metadata = ''
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if metadata is None:
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raise NoneMetadataError(dist, metadata_name)
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feed_parser = FeedParser()
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# The following line errors out if with a "NoneType" TypeError if
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# passed metadata=None.
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feed_parser.feed(metadata)
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return feed_parser.close()
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def get_requires_python(dist):
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# type: (pkg_resources.Distribution) -> Optional[str]
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"""
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Return the "Requires-Python" metadata for a distribution, or None
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if not present.
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"""
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pkg_info_dict = get_metadata(dist)
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requires_python = pkg_info_dict.get('Requires-Python')
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if requires_python is not None:
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# Convert to a str to satisfy the type checker, since requires_python
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# can be a Header object.
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requires_python = str(requires_python)
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return requires_python
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def get_installer(dist):
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# type: (Distribution) -> str
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if dist.has_metadata('INSTALLER'):
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for line in dist.get_metadata_lines('INSTALLER'):
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if line.strip():
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return line.strip()
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return ''
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