update

.CondaPkg/env/Lib/site-packages/pip/_internal/distributions/base.py

@@ -1,9 +1,12 @@
 import abc
+from typing import TYPE_CHECKING, Optional
 
-from pip._internal.index.package_finder import PackageFinder
 from pip._internal.metadata.base import BaseDistribution
 from pip._internal.req import InstallRequirement
 
+if TYPE_CHECKING:
+    from pip._internal.index.package_finder import PackageFinder
+
 
 class AbstractDistribution(metaclass=abc.ABCMeta):
     """A base class for handling installable artifacts.
@@ -19,12 +22,23 @@ 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()
@@ -32,7 +46,7 @@ class AbstractDistribution(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def prepare_distribution_metadata(
         self,
-        finder: PackageFinder,
+        finder: "PackageFinder",
         build_isolation: bool,
         check_build_deps: bool,
     ) -> None: