From 7731139b7af655b9f5df6d1b5493f8dfdf41d569 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 29 Jun 2020 05:07:41 -0700
Subject: [PATCH] bpo-41048: mimetypes should read the rule file using UTF-8,
 not the locale encoding (GH-20998)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

(cherry picked from commit 7f569c9bc0079906012b3034d30fe8abc742e7fc)

Co-authored-by: Srinivas Reddy Thatiparthy (శ్రీనివాస్  రెడ్డి తాటిపర్తి) <thatiparthysreenivas@gmail.com>
---
 Lib/mimetypes.py                                     |  2 +-
 Lib/test/test_mimetypes.py                           | 12 ++++++++++++
 Misc/ACKS                                            |  1 +
 .../Library/2020-06-20-10-16-57.bpo-41048.hEXB-B.rst |  2 ++
 4 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-06-20-10-16-57.bpo-41048.hEXB-B.rst

diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 434f5b37c58..954bb0a7453 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -372,7 +372,7 @@ def init(files=None):
 
 def read_mime_types(file):
     try:
-        f = open(file)
+        f = open(file, encoding='utf-8')
     except OSError:
         return None
     with f:
diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
index 9cac6ce0225..683d393fdb4 100644
--- a/Lib/test/test_mimetypes.py
+++ b/Lib/test/test_mimetypes.py
@@ -67,6 +67,18 @@ class MimeTypesTestCase(unittest.TestCase):
             mime_dict = mimetypes.read_mime_types(file)
             eq(mime_dict[".pyunit"], "x-application/x-unittest")
 
+        # bpo-41048: read_mime_types should read the rule file with 'utf-8' encoding.
+        # Not with locale encoding. _bootlocale has been imported because io.open(...)
+        # uses it.
+        with support.temp_dir() as directory:
+            data = "application/no-mans-land  Fran\u00E7ais"
+            file = pathlib.Path(directory, "sample.mimetype")
+            file.write_text(data, encoding='utf-8')
+            import _bootlocale
+            with support.swap_attr(_bootlocale, 'getpreferredencoding', lambda do_setlocale=True: 'ASCII'):
+                mime_dict = mimetypes.read_mime_types(file)
+            eq(mime_dict[".Français"], "application/no-mans-land")
+
     def test_non_standard_types(self):
         eq = self.assertEqual
         # First try strict
diff --git a/Misc/ACKS b/Misc/ACKS
index 8098637a32c..a08e917b307 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1669,6 +1669,7 @@ Mikhail Terekhov
 Victor Terrón
 Pablo Galindo
 Richard M. Tew
+Srinivas Reddy Thatiparthy
 Tobias Thelen
 Christian Theune
 Févry Thibault
diff --git a/Misc/NEWS.d/next/Library/2020-06-20-10-16-57.bpo-41048.hEXB-B.rst b/Misc/NEWS.d/next/Library/2020-06-20-10-16-57.bpo-41048.hEXB-B.rst
new file mode 100644
index 00000000000..2595900137d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-06-20-10-16-57.bpo-41048.hEXB-B.rst
@@ -0,0 +1,2 @@
+:func:`mimetypes.read_mime_types` function reads the rule file using UTF-8 encoding, not the locale encoding.
+Patch by Srinivas Reddy Thatiparthy.
\ No newline at end of file