From 3b3dfac2c16a3f229f69180fc769583f21e3b6c6 Mon Sep 17 00:00:00 2001
From: Lucas Cimon <lucas.cimon@gmail.com>
Date: Fri, 31 Mar 2017 15:15:10 +0200
Subject: [PATCH] Avoid pip.main leaking loggers - fixes #3043

---
 pip/basecommand.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pip/basecommand.py b/pip/basecommand.py
index 6ba36069558..2c17c92c689 100644
--- a/pip/basecommand.py
+++ b/pip/basecommand.py
@@ -210,6 +210,8 @@ def main(self, args):
                 )
                 sys.exit(VIRTUALENV_NOT_FOUND)
 
+        original_root_handlers = set(logging.root.handlers)
+
         try:
             status = self.run(options, args)
             # FIXME: all commands should return an exit status
@@ -249,6 +251,10 @@ def main(self, args):
                         retries=0,
                         timeout=min(5, options.timeout)) as session:
                     pip_version_check(session, options)
+            # Avoid leaking loggers
+            for handler in set(logging.root.handlers) - original_root_handlers:
+                # this method benefit from the Logger class internal lock
+                logging.root.removeHandler(handler)
 
         return SUCCESS