Remove additional detection of installed egg distributions when using the imporlib.metadata backend

news/12308.bugfix.rst

@@ -0,0 +1,4 @@
+When using the ``importlib.metadata`` backend (the default on Python 3.11+),
+``pip list`` does not show installed egg distributions more than once anymore.
+Additionally, egg distributions whose parent directory was in ``sys.path`` but
+the egg themselves were not in ``sys.path`` are not detected anymore.

news/13010.removal.rst

@@ -1,2 +1 @@
-On python 3.14+, the ``pkg_resources`` metadata backend is not used anymore,
-and pip does not attempt to detect installed ``.egg`` distributions.
+On python 3.14+, the ``pkg_resources`` metadata backend cannot be used anymore.

src/pip/_internal/metadata/base.py

@@ -231,7 +231,9 @@ def installed_as_egg(self) -> bool:
         location = self.location
         if not location:
             return False
-        return location.endswith(".egg")
+        # XXX if the distribution is a zipped egg, location has a trailing /
+        # so we resort to pathlib.Path to check the suffix in a reliable way.
+        return pathlib.Path(location).suffix == ".egg"
 
     @property
     def installed_with_setuptools_egg_info(self) -> bool:

src/pip/_internal/metadata/importlib/_envs.py

@@ -1,11 +1,9 @@
-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 (
@@ -16,7 +14,6 @@
 )
 
 from pip._internal.metadata.base import BaseDistribution, BaseEnvironment
-from pip._internal.utils.deprecation import deprecated
 from pip._internal.utils.filetypes import WHEEL_EXTENSION
 
 from ._compat import BadMetadata, BasePath, get_dist_canonical_name, get_info_location
@@ -88,7 +85,7 @@ def find(self, location: str) -> Iterator[BaseDistribution]:
                 installed_location = info_location.parent
             yield Distribution(dist, info_location, installed_location)
 
-    def find_linked(self, location: str) -> Iterator[BaseDistribution]:
+    def find_legacy_editables(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
@@ -112,54 +109,6 @@ def find_linked(self, location: str) -> Iterator[BaseDistribution]:
             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="25.1",
-        issue=12330,
-    )
-
 
 class Environment(BaseEnvironment):
     def __init__(self, paths: Sequence[str]) -> None:
@@ -179,12 +128,7 @@ def _iter_distributions(self) -> Iterator[BaseDistribution]:
         finder = _DistributionFinder()
         for location in self._paths:
             yield from finder.find(location)
-            if sys.version_info < (3, 14):
-                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)
+            yield from finder.find_legacy_editables(location)
 
     def get_distribution(self, name: str) -> Optional[BaseDistribution]:
         canonical_name = canonicalize_name(name)

src/pip/_internal/req/req_uninstall.py

@@ -505,10 +505,13 @@ def from_dist(cls, dist: BaseDistribution) -> "UninstallPathSet":
             # package installed by easy_install
             # We cannot match on dist.egg_name because it can slightly vary
             # i.e. setuptools-0.6c11-py2.6.egg vs setuptools-0.6rc11-py2.6.egg
-            paths_to_remove.add(dist_location)
-            easy_install_egg = os.path.split(dist_location)[1]
+            # XXX We use normalized_dist_location because dist_location my contain
+            # a trailing / if the distribution is a zipped egg
+            # (which is not a directory).
+            paths_to_remove.add(normalized_dist_location)
+            easy_install_egg = os.path.split(normalized_dist_location)[1]
             easy_install_pth = os.path.join(
-                os.path.dirname(dist_location),
+                os.path.dirname(normalized_dist_location),
                 "easy-install.pth",
             )
             paths_to_remove.add_pth(easy_install_pth, "./" + easy_install_egg)

tests/functional/test_uninstall.py

@@ -628,10 +628,6 @@ def test_uninstall_with_symlink(
     assert symlink_target.stat().st_mode == st_mode
 
 
-@pytest.mark.skipif(
-    "sys.version_info >= (3, 14)",
-    reason="Uninstall of .egg distributions not supported in Python 3.14+",
-)
 def test_uninstall_setuptools_develop_install(
     script: PipTestEnvironment, data: TestData
 ) -> None:
@@ -642,11 +638,19 @@ def test_uninstall_setuptools_develop_install(
     script.assert_installed(FSPkg="0.1.dev0")
     # Uninstall both develop and install
     uninstall = script.pip("uninstall", "FSPkg", "-y")
-    assert any(p.suffix == ".egg" for p in uninstall.files_deleted), str(uninstall)
     uninstall2 = script.pip("uninstall", "FSPkg", "-y")
-    assert (
+    # Depending on the metadata backend, the egg-link will be uninstalled first
+    # or second, so we use xor in the assertions below.
+    assert (join(script.site_packages, "FSPkg.egg-link") in uninstall.files_deleted) ^ (
         join(script.site_packages, "FSPkg.egg-link") in uninstall2.files_deleted
-    ), str(uninstall2)
+    )
+    assert any(
+        p.name.startswith("FSPkg") and p.suffix == ".egg"
+        for p in uninstall.files_deleted
+    ) ^ any(
+        p.name.startswith("FSPkg") and p.suffix == ".egg"
+        for p in uninstall2.files_deleted
+    )
     script.assert_not_installed("FSPkg")