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.venv/lib/python3.12/site-packages/pip/_internal/distributions/base.py

@@ -1,4 +1,5 @@
 import abc
+from typing import Optional
 
 from pip._internal.index.package_finder import PackageFinder
 from pip._internal.metadata.base import BaseDistribution
@@ -19,12 +20,23 @@ class AbstractDistribution(metaclass=abc.ABCMeta):
 
      - we must be able to create a Distribution object exposing the
        above metadata.
+
+     - if we need to do work in the build tracker, we must be able to generate a unique
+       string to identify the requirement in the build tracker.
     """
 
     def __init__(self, req: InstallRequirement) -> None:
         super().__init__()
         self.req = req
 
+    @abc.abstractproperty
+    def build_tracker_id(self) -> Optional[str]:
+        """A string that uniquely identifies this requirement to the build tracker.
+
+        If None, then this dist has no work to do in the build tracker, and
+        ``.prepare_distribution_metadata()`` will not be called."""
+        raise NotImplementedError()
+
     @abc.abstractmethod
     def get_metadata_distribution(self) -> BaseDistribution:
         raise NotImplementedError()

.venv/lib/python3.12/site-packages/pip/_internal/distributions/installed.py

@@ -1,3 +1,5 @@
+from typing import Optional
+
 from pip._internal.distributions.base import AbstractDistribution
 from pip._internal.index.package_finder import PackageFinder
 from pip._internal.metadata import BaseDistribution
@@ -10,6 +12,10 @@ class InstalledDistribution(AbstractDistribution):
     been computed.
     """
 
+    @property
+    def build_tracker_id(self) -> Optional[str]:
+        return None
+
     def get_metadata_distribution(self) -> BaseDistribution:
         assert self.req.satisfied_by is not None, "not actually installed"
         return self.req.satisfied_by

.venv/lib/python3.12/site-packages/pip/_internal/distributions/sdist.py

@@ -1,5 +1,5 @@
 import logging
-from typing import Iterable, Set, Tuple
+from typing import Iterable, Optional, Set, Tuple
 
 from pip._internal.build_env import BuildEnvironment
 from pip._internal.distributions.base import AbstractDistribution
@@ -18,6 +18,12 @@ class SourceDistribution(AbstractDistribution):
     generated, either using PEP 517 or using the legacy `setup.py egg_info`.
     """
 
+    @property
+    def build_tracker_id(self) -> Optional[str]:
+        """Identify this requirement uniquely by its link."""
+        assert self.req.link
+        return self.req.link.url_without_fragment
+
     def get_metadata_distribution(self) -> BaseDistribution:
         return self.req.get_dist()
 

.venv/lib/python3.12/site-packages/pip/_internal/distributions/wheel.py

@@ -1,3 +1,5 @@
+from typing import Optional
+
 from pip._vendor.packaging.utils import canonicalize_name
 
 from pip._internal.distributions.base import AbstractDistribution
@@ -15,6 +17,10 @@ class WheelDistribution(AbstractDistribution):
     This does not need any preparation as wheels can be directly unpacked.
     """
 
+    @property
+    def build_tracker_id(self) -> Optional[str]:
+        return None
+
     def get_metadata_distribution(self) -> BaseDistribution:
         """Loads the metadata from the wheel file into memory and returns a
         Distribution that uses it, not relying on the wheel file or