From 4681d386aebac109fe490eb00706b97290908d0a Mon Sep 17 00:00:00 2001
From: Pradyun Gedam <pradyunsg@gmail.com>
Date: Fri, 1 Nov 2019 22:43:53 +0530
Subject: [PATCH] Invoke pip via runpy, in ensurepip

---
 Lib/ensurepip/__init__.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Lib/ensurepip/__init__.py b/Lib/ensurepip/__init__.py
index 386ed6c25c763e..eb3612551cd50f 100644
--- a/Lib/ensurepip/__init__.py
+++ b/Lib/ensurepip/__init__.py
@@ -1,6 +1,7 @@
 import os
 import os.path
 import sys
+import runpy
 import tempfile
 from importlib import resources
 
@@ -26,9 +27,17 @@ def _run_pip(args, additional_paths=None):
     if additional_paths is not None:
         sys.path = additional_paths + sys.path
 
-    # Install the bundled software
-    import pip._internal
-    return pip._internal.main(args)
+    # Invoke pip as if it's the main module, and catch the exit.
+    backup_argv = sys.argv[:]
+    sys.argv[1:] = args
+    try:
+        runpy.run_module("pip", run_name="__main__", alter_sys=True)
+    except SystemExit as e:
+        return e.code
+    finally:
+        sys.argv[:] = backup_argv
+
+    assert 0, "should never reach here"
 
 
 def version():