add ydb deps

1 files changed, 70 insertions, 0 deletions

diff --git a/contrib/python/importlib-metadata/py3/importlib_metadata/_compat.py b/contrib/python/importlib-metadata/py3/importlib_metadata/_compat.py
new file mode 100644
index 0000000000..a48b609be6
--- /dev/null
+++ b/contrib/python/importlib-metadata/py3/importlib_metadata/_compat.py
@@ -0,0 +1,70 @@
+import os
+import sys
+import platform
+
+from typing import Union
+
+
+__all__ = ['install', 'NullFinder']
+
+
+def install(flag):
+    def dec_install(cls):
+        """
+        Class decorator for installation on sys.meta_path.
+
+        Adds the backport DistributionFinder to sys.meta_path and
+        attempts to disable the finder functionality of the stdlib
+        DistributionFinder.
+        """
+        if flag:
+            sys.meta_path.append(cls())
+            disable_stdlib_finder()
+        return cls
+    return dec_install
+
+
+def disable_stdlib_finder():
+    """
+    Give the backport primacy for discovering path-based distributions
+    by monkey-patching the stdlib O_O.
+
+    See #91 for more background for rationale on this sketchy
+    behavior.
+    """
+
+    def matches(finder):
+        return getattr(
+            finder, '__module__', None
+        ) == '_frozen_importlib_external' and hasattr(finder, 'find_distributions')
+
+    for finder in filter(matches, sys.meta_path):  # pragma: nocover
+        del finder.find_distributions
+
+
+class NullFinder:
+    """
+    A "Finder" (aka "MetaClassFinder") that never finds any modules,
+    but may find distributions.
+    """
+
+    @staticmethod
+    def find_spec(*args, **kwargs):
+        return None
+
+
+def pypy_partial(val):
+    """
+    Adjust for variable stacklevel on partial under PyPy.
+
+    Workaround for #327.
+    """
+    is_pypy = platform.python_implementation() == 'PyPy'
+    return val + is_pypy
+
+
+if sys.version_info >= (3, 9):
+    StrPath = Union[str, os.PathLike[str]]
+else:
+    # PathLike is only subscriptable at runtime in 3.9+
+    StrPath = Union[str, "os.PathLike[str]"]  # pragma: no cover