257 lines
9.2 KiB
Python
257 lines
9.2 KiB
Python
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import email.message
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import email.parser
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import logging
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import os
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import pathlib
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import zipfile
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from typing import Collection, Iterable, Iterator, List, Mapping, NamedTuple, Optional
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from pip._vendor import pkg_resources
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from pip._vendor.packaging.requirements import Requirement
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from pip._vendor.packaging.utils import NormalizedName, canonicalize_name
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from pip._vendor.packaging.version import parse as parse_version
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from pip._internal.exceptions import InvalidWheel, NoneMetadataError, UnsupportedWheel
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from pip._internal.utils.misc import display_path
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from pip._internal.utils.wheel import parse_wheel, read_wheel_metadata_file
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from .base import (
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BaseDistribution,
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BaseEntryPoint,
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BaseEnvironment,
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DistributionVersion,
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InfoPath,
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Wheel,
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)
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logger = logging.getLogger(__name__)
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class EntryPoint(NamedTuple):
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name: str
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value: str
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group: str
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class WheelMetadata:
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"""IMetadataProvider that reads metadata files from a dictionary.
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This also maps metadata decoding exceptions to our internal exception type.
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"""
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def __init__(self, metadata: Mapping[str, bytes], wheel_name: str) -> None:
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self._metadata = metadata
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self._wheel_name = wheel_name
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def has_metadata(self, name: str) -> bool:
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return name in self._metadata
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def get_metadata(self, name: str) -> str:
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try:
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return self._metadata[name].decode()
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except UnicodeDecodeError as e:
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# Augment the default error with the origin of the file.
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raise UnsupportedWheel(
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f"Error decoding metadata for {self._wheel_name}: {e} in {name} file"
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)
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def get_metadata_lines(self, name: str) -> Iterable[str]:
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return pkg_resources.yield_lines(self.get_metadata(name))
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def metadata_isdir(self, name: str) -> bool:
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return False
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def metadata_listdir(self, name: str) -> List[str]:
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return []
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def run_script(self, script_name: str, namespace: str) -> None:
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pass
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class Distribution(BaseDistribution):
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def __init__(self, dist: pkg_resources.Distribution) -> None:
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self._dist = dist
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@classmethod
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def from_directory(cls, directory: str) -> "Distribution":
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dist_dir = directory.rstrip(os.sep)
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# Build a PathMetadata object, from path to metadata. :wink:
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base_dir, dist_dir_name = os.path.split(dist_dir)
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metadata = pkg_resources.PathMetadata(base_dir, dist_dir)
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# Determine the correct Distribution object type.
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if dist_dir.endswith(".egg-info"):
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dist_cls = pkg_resources.Distribution
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dist_name = os.path.splitext(dist_dir_name)[0]
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else:
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assert dist_dir.endswith(".dist-info")
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dist_cls = pkg_resources.DistInfoDistribution
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dist_name = os.path.splitext(dist_dir_name)[0].split("-")[0]
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dist = dist_cls(base_dir, project_name=dist_name, metadata=metadata)
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return cls(dist)
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@classmethod
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def from_wheel(cls, wheel: Wheel, name: str) -> "Distribution":
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"""Load the distribution from a given wheel.
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:raises InvalidWheel: Whenever loading of the wheel causes a
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:py:exc:`zipfile.BadZipFile` exception to be thrown.
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:raises UnsupportedWheel: If the wheel is a valid zip, but malformed
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internally.
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"""
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try:
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with wheel.as_zipfile() as zf:
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info_dir, _ = parse_wheel(zf, name)
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metadata_text = {
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path.split("/", 1)[-1]: read_wheel_metadata_file(zf, path)
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for path in zf.namelist()
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if path.startswith(f"{info_dir}/")
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}
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except zipfile.BadZipFile as e:
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raise InvalidWheel(wheel.location, name) from e
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except UnsupportedWheel as e:
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raise UnsupportedWheel(f"{name} has an invalid wheel, {e}")
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dist = pkg_resources.DistInfoDistribution(
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location=wheel.location,
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metadata=WheelMetadata(metadata_text, wheel.location),
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project_name=name,
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)
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return cls(dist)
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@property
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def location(self) -> Optional[str]:
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return self._dist.location
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@property
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def info_location(self) -> Optional[str]:
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return self._dist.egg_info
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@property
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def installed_by_distutils(self) -> bool:
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# A distutils-installed distribution is provided by FileMetadata. This
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# provider has a "path" attribute not present anywhere else. Not the
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# best introspection logic, but pip has been doing this for a long time.
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try:
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return bool(self._dist._provider.path)
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except AttributeError:
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return False
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@property
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def canonical_name(self) -> NormalizedName:
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return canonicalize_name(self._dist.project_name)
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@property
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def version(self) -> DistributionVersion:
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return parse_version(self._dist.version)
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def is_file(self, path: InfoPath) -> bool:
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return self._dist.has_metadata(str(path))
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def iterdir(self, path: InfoPath) -> Iterator[pathlib.PurePosixPath]:
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name = str(path)
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if not self._dist.has_metadata(name):
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raise FileNotFoundError(name)
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if not self._dist.isdir(name):
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raise NotADirectoryError(name)
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for child in self._dist.metadata_listdir(name):
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yield pathlib.PurePosixPath(path, child)
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def read_text(self, path: InfoPath) -> str:
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name = str(path)
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if not self._dist.has_metadata(name):
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raise FileNotFoundError(name)
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content = self._dist.get_metadata(name)
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if content is None:
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raise NoneMetadataError(self, name)
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return content
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def iter_entry_points(self) -> Iterable[BaseEntryPoint]:
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for group, entries in self._dist.get_entry_map().items():
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for name, entry_point in entries.items():
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name, _, value = str(entry_point).partition("=")
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yield EntryPoint(name=name.strip(), value=value.strip(), group=group)
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@property
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def metadata(self) -> email.message.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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if isinstance(self._dist, pkg_resources.DistInfoDistribution):
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metadata_name = "METADATA"
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else:
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metadata_name = "PKG-INFO"
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try:
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metadata = self.read_text(metadata_name)
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except FileNotFoundError:
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if self.location:
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displaying_path = display_path(self.location)
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else:
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displaying_path = repr(self.location)
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logger.warning("No metadata found in %s", displaying_path)
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metadata = ""
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feed_parser = email.parser.FeedParser()
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feed_parser.feed(metadata)
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return feed_parser.close()
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def iter_dependencies(self, extras: Collection[str] = ()) -> Iterable[Requirement]:
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if extras: # pkg_resources raises on invalid extras, so we sanitize.
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extras = frozenset(extras).intersection(self._dist.extras)
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return self._dist.requires(extras)
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def iter_provided_extras(self) -> Iterable[str]:
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return self._dist.extras
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class Environment(BaseEnvironment):
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def __init__(self, ws: pkg_resources.WorkingSet) -> None:
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self._ws = ws
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@classmethod
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def default(cls) -> BaseEnvironment:
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return cls(pkg_resources.working_set)
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@classmethod
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def from_paths(cls, paths: Optional[List[str]]) -> BaseEnvironment:
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return cls(pkg_resources.WorkingSet(paths))
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def _search_distribution(self, name: str) -> Optional[BaseDistribution]:
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"""Find a distribution matching the ``name`` in the environment.
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This searches from *all* distributions available in the environment, to
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match the behavior of ``pkg_resources.get_distribution()``.
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"""
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canonical_name = canonicalize_name(name)
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for dist in self.iter_distributions():
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if dist.canonical_name == canonical_name:
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return dist
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return None
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def get_distribution(self, name: str) -> Optional[BaseDistribution]:
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# Search the distribution by looking through the working set.
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dist = self._search_distribution(name)
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if dist:
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return dist
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# If distribution could not be found, call working_set.require to
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# update the working set, and try to find the distribution again.
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# This might happen for e.g. when you install a package twice, once
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# using setup.py develop and again using setup.py install. Now when
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# running pip uninstall twice, the package gets removed from the
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# working set in the first uninstall, so we have to populate the
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# working set again so that pip knows about it and the packages gets
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# picked up and is successfully uninstalled the second time too.
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try:
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# We didn't pass in any version specifiers, so this can never
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# raise pkg_resources.VersionConflict.
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self._ws.require(name)
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except pkg_resources.DistributionNotFound:
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return None
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return self._search_distribution(name)
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def _iter_distributions(self) -> Iterator[BaseDistribution]:
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for dist in self._ws:
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yield Distribution(dist)
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