From 376abc06554fc78c990b83942fca77a64ba15bd2 Mon Sep 17 00:00:00 2001
From: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Date: Sat, 27 Oct 2018 12:23:01 +0200
Subject: [PATCH] remove last user of SafeConfigParser

Fixes #5059
---
 news/5059.trivial                      |  0
 src/pip/_internal/vcs/mercurial.py     |  2 +-
 tests/functional/test_vcs_mercurial.py | 28 ++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 news/5059.trivial
 create mode 100644 tests/functional/test_vcs_mercurial.py

diff --git a/news/5059.trivial b/news/5059.trivial
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/src/pip/_internal/vcs/mercurial.py b/src/pip/_internal/vcs/mercurial.py
index 17cfb67d1f1..5bca55627f5 100644
--- a/src/pip/_internal/vcs/mercurial.py
+++ b/src/pip/_internal/vcs/mercurial.py
@@ -45,7 +45,7 @@ def fetch_new(self, dest, url, rev_options):
 
     def switch(self, dest, url, rev_options):
         repo_config = os.path.join(dest, self.dirname, 'hgrc')
-        config = configparser.SafeConfigParser()
+        config = configparser.RawConfigParser()
         try:
             config.read(repo_config)
             config.set('paths', 'default', url)
diff --git a/tests/functional/test_vcs_mercurial.py b/tests/functional/test_vcs_mercurial.py
new file mode 100644
index 00000000000..797a392a5b0
--- /dev/null
+++ b/tests/functional/test_vcs_mercurial.py
@@ -0,0 +1,28 @@
+"""
+Contains functional tests of the Mercurial class.
+"""
+
+import os
+
+from pip._vendor.six.moves import configparser
+
+from pip._internal.vcs.mercurial import Mercurial
+from tests.lib import need_mercurial
+
+
+@need_mercurial
+def test_mercurial_switch_updates_config_file_when_found(tmpdir):
+    hg = Mercurial()
+    options = hg.make_rev_options()
+    hg_dir = os.path.join(tmpdir, '.hg')
+    os.mkdir(hg_dir)
+    config = configparser.RawConfigParser()
+    config.add_section('paths')
+    config.set('paths', 'default', 'old_url')
+    hgrc_path = os.path.join(hg_dir, 'hgrc')
+    with open(hgrc_path, 'w') as f:
+        config.write(f)
+    hg.switch(tmpdir, 'new_url', options)
+    config.read(hgrc_path)
+    default_path = config.get('paths', 'default')
+    assert default_path == 'new_url'