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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="24.3",
issue=12330,
)
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)
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)