diff options
Diffstat (limited to 'third_party/python/pip/pip/_internal/metadata/importlib/_envs.py')
| -rw-r--r-- | third_party/python/pip/pip/_internal/metadata/importlib/_envs.py | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/third_party/python/pip/pip/_internal/metadata/importlib/_envs.py b/third_party/python/pip/pip/_internal/metadata/importlib/_envs.py new file mode 100644 index 0000000000..cbec59e2c6 --- /dev/null +++ b/third_party/python/pip/pip/_internal/metadata/importlib/_envs.py @@ -0,0 +1,188 @@ +import functools +import importlib.metadata +import logging +import os +import pathlib +import sys +import zipfile +import zipimport +from typing import Iterator, List, Optional, Sequence, Set, Tuple + +from pip._vendor.packaging.utils import NormalizedName, canonicalize_name + +from pip._internal.metadata.base import BaseDistribution, BaseEnvironment +from pip._internal.models.wheel import Wheel +from pip._internal.utils.deprecation import deprecated +from pip._internal.utils.filetypes import WHEEL_EXTENSION + +from ._compat import BadMetadata, BasePath, get_dist_name, get_info_location +from ._dists import Distribution + +logger = logging.getLogger(__name__) + + +def _looks_like_wheel(location: str) -> bool: + if not location.endswith(WHEEL_EXTENSION): + return False + if not os.path.isfile(location): + return False + if not Wheel.wheel_file_re.match(os.path.basename(location)): + return False + return zipfile.is_zipfile(location) + + +class _DistributionFinder: + """Finder to locate distributions. + + The main purpose of this class is to memoize found distributions' names, so + only one distribution is returned for each package name. At lot of pip code + assumes this (because it is setuptools's behavior), and not doing the same + can potentially cause a distribution in lower precedence path to override a + higher precedence one if the caller is not careful. + + Eventually we probably want to make it possible to see lower precedence + installations as well. It's useful feature, after all. + """ + + FoundResult = Tuple[importlib.metadata.Distribution, Optional[BasePath]] + + def __init__(self) -> None: + self._found_names: Set[NormalizedName] = set() + + def _find_impl(self, location: str) -> Iterator[FoundResult]: + """Find distributions in a location.""" + # Skip looking inside a wheel. Since a package inside a wheel is not + # always valid (due to .data directories etc.), its .dist-info entry + # should not be considered an installed distribution. + if _looks_like_wheel(location): + return + # To know exactly where we find a distribution, we have to feed in the + # paths one by one, instead of dumping the list to importlib.metadata. + for dist in importlib.metadata.distributions(path=[location]): + info_location = get_info_location(dist) + try: + raw_name = get_dist_name(dist) + except BadMetadata as e: + logger.warning("Skipping %s due to %s", info_location, e.reason) + continue + normalized_name = canonicalize_name(raw_name) + if normalized_name in self._found_names: + continue + self._found_names.add(normalized_name) + yield dist, info_location + + def find(self, location: str) -> Iterator[BaseDistribution]: + """Find distributions in a location. + + The path can be either a directory, or a ZIP archive. + """ + for dist, info_location in self._find_impl(location): + if info_location is None: + installed_location: Optional[BasePath] = None + else: + installed_location = info_location.parent + yield Distribution(dist, info_location, installed_location) + + def find_linked(self, location: str) -> Iterator[BaseDistribution]: + """Read location in egg-link files and return distributions in there. + + The path should be a directory; otherwise this returns nothing. This + follows how setuptools does this for compatibility. The first non-empty + line in the egg-link is read as a path (resolved against the egg-link's + containing directory if relative). Distributions found at that linked + location are returned. + """ + path = pathlib.Path(location) + if not path.is_dir(): + return + for child in path.iterdir(): + if child.suffix != ".egg-link": + continue + with child.open() as f: + lines = (line.strip() for line in f) + target_rel = next((line for line in lines if line), "") + if not target_rel: + continue + target_location = str(path.joinpath(target_rel)) + for dist, info_location in self._find_impl(target_location): + yield Distribution(dist, info_location, path) + + def _find_eggs_in_dir(self, location: str) -> Iterator[BaseDistribution]: + from pip._vendor.pkg_resources import find_distributions + + from pip._internal.metadata import pkg_resources as legacy + + with os.scandir(location) as it: + for entry in it: + if not entry.name.endswith(".egg"): + continue + for dist in find_distributions(entry.path): + yield legacy.Distribution(dist) + + def _find_eggs_in_zip(self, location: str) -> Iterator[BaseDistribution]: + from pip._vendor.pkg_resources import find_eggs_in_zip + + from pip._internal.metadata import pkg_resources as legacy + + try: + importer = zipimport.zipimporter(location) + except zipimport.ZipImportError: + return + for dist in find_eggs_in_zip(importer, location): + yield legacy.Distribution(dist) + + def find_eggs(self, location: str) -> Iterator[BaseDistribution]: + """Find eggs in a location. + + This actually uses the old *pkg_resources* backend. We likely want to + deprecate this so we can eventually remove the *pkg_resources* + dependency entirely. Before that, this should first emit a deprecation + warning for some versions when using the fallback since importing + *pkg_resources* is slow for those who don't need it. + """ + if os.path.isdir(location): + yield from self._find_eggs_in_dir(location) + if zipfile.is_zipfile(location): + yield from self._find_eggs_in_zip(location) + + +@functools.lru_cache(maxsize=None) # Warn a distribution exactly once. +def _emit_egg_deprecation(location: Optional[str]) -> None: + deprecated( + reason=f"Loading egg at {location} is deprecated.", + replacement="to use pip for package installation.", + gone_in=None, + ) + + +class Environment(BaseEnvironment): + def __init__(self, paths: Sequence[str]) -> None: + self._paths = paths + + @classmethod + def default(cls) -> BaseEnvironment: + return cls(sys.path) + + @classmethod + def from_paths(cls, paths: Optional[List[str]]) -> BaseEnvironment: + if paths is None: + return cls(sys.path) + return cls(paths) + + def _iter_distributions(self) -> Iterator[BaseDistribution]: + finder = _DistributionFinder() + for location in self._paths: + yield from finder.find(location) + for dist in finder.find_eggs(location): + # _emit_egg_deprecation(dist.location) # TODO: Enable this. + yield dist + # This must go last because that's how pkg_resources tie-breaks. + yield from finder.find_linked(location) + + def get_distribution(self, name: str) -> Optional[BaseDistribution]: + matches = ( + distribution + for distribution in self.iter_all_distributions() + if distribution.canonical_name == canonicalize_name(name) + ) + return next(matches, None) |