1 files changed, 35 insertions, 3 deletions
diff --git a/src/pip/_vendor/tenacity/retry.py b/src/pip/_vendor/tenacity/retry.py
index 9ebeb62d5..38988739d 100644
--- a/src/pip/_vendor/tenacity/retry.py
+++ b/src/pip/_vendor/tenacity/retry.py
@@ -36,6 +36,9 @@ class retry_base(abc.ABC):
         return retry_any(self, other)
 
 
+RetryBaseT = typing.Union[retry_base, typing.Callable[["RetryCallState"], bool]]
+
+
 class _retry_never(retry_base):
     """Retry strategy that never rejects any result."""
 
@@ -63,8 +66,14 @@ class retry_if_exception(retry_base):
         self.predicate = predicate
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__() called before outcome was set")
+
         if retry_state.outcome.failed:
-            return self.predicate(retry_state.outcome.exception())
+            exception = retry_state.outcome.exception()
+            if exception is None:
+                raise RuntimeError("outcome failed but the exception is None")
+            return self.predicate(exception)
         else:
             return False
 
@@ -111,10 +120,17 @@ class retry_unless_exception_type(retry_if_exception):
         super().__init__(lambda e: not isinstance(e, exception_types))
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__() called before outcome was set")
+
         # always retry if no exception was raised
         if not retry_state.outcome.failed:
             return True
-        return self.predicate(retry_state.outcome.exception())
+
+        exception = retry_state.outcome.exception()
+        if exception is None:
+            raise RuntimeError("outcome failed but the exception is None")
+        return self.predicate(exception)
 
 
 class retry_if_exception_cause_type(retry_base):
@@ -134,6 +150,9 @@ class retry_if_exception_cause_type(retry_base):
         self.exception_cause_types = exception_types
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__ called before outcome was set")
+
         if retry_state.outcome.failed:
             exc = retry_state.outcome.exception()
             while exc is not None:
@@ -151,6 +170,9 @@ class retry_if_result(retry_base):
         self.predicate = predicate
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__() called before outcome was set")
+
         if not retry_state.outcome.failed:
             return self.predicate(retry_state.outcome.result())
         else:
@@ -164,6 +186,9 @@ class retry_if_not_result(retry_base):
         self.predicate = predicate
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__() called before outcome was set")
+
         if not retry_state.outcome.failed:
             return not self.predicate(retry_state.outcome.result())
         else:
@@ -215,9 +240,16 @@ class retry_if_not_exception_message(retry_if_exception_message):
         self.predicate = lambda *args_, **kwargs_: not if_predicate(*args_, **kwargs_)
 
     def __call__(self, retry_state: "RetryCallState") -> bool:
+        if retry_state.outcome is None:
+            raise RuntimeError("__call__() called before outcome was set")
+
         if not retry_state.outcome.failed:
             return True
-        return self.predicate(retry_state.outcome.exception())
+
+        exception = retry_state.outcome.exception()
+        if exception is None:
+            raise RuntimeError("outcome failed but the exception is None")
+        return self.predicate(exception)
 
 
 class retry_any(retry_base):