bpo-32304: Fix distutils upload for sdists ending with \x0d (GH-5264)

Patch by Bo Bayles.

Doc/whatsnew/3.7.rst

@@ -416,6 +416,11 @@ therefore included in source distributions.
 and ``platforms`` fields are not specified as a list or a string.
 (Contributed by Berker Peksag in :issue:`19610`.)
 
+The ``upload`` command now longer tries to change CR end-of-line characters
+to CRLF.  This fixes a corruption issue with sdists that ended with a byte
+equivalent to CR.
+(Contributed by Bo Bayles in :issue:`32304`.)
+
 http.client
 -----------
 

Lib/distutils/command/upload.py

@@ -159,8 +159,6 @@ class upload(PyPIRCCommand):
                 body.write(title.encode('utf-8'))
                 body.write(b"\r\n\r\n")
                 body.write(value)
-                if value and value[-1:] == b'\r':
-                    body.write(b'\n')  # write an extra newline (lurve Macs)
         body.write(end_boundary)
         body = body.getvalue()
 

Lib/distutils/tests/test_upload.py

@@ -143,6 +143,32 @@ class uploadTestCase(BasePyPIRCCommandTestCase):
         results = self.get_logs(INFO)
         self.assertEqual(results[-1], 75 * '-' + '\nxyzzy\n' + 75 * '-')
 
+    # bpo-32304: archives whose last byte was b'\r' were corrupted due to
+    # normalization intended for Mac OS 9.
+    def test_upload_correct_cr(self):
+        # content that ends with \r should not be modified.
+        tmp = self.mkdtemp()
+        path = os.path.join(tmp, 'xxx')
+        self.write_file(path, content='yy\r')
+        command, pyversion, filename = 'xxx', '2.6', path
+        dist_files = [(command, pyversion, filename)]
+        self.write_file(self.rc, PYPIRC_LONG_PASSWORD)
+
+        # other fields that ended with \r used to be modified, now are
+        # preserved.
+        pkg_dir, dist = self.create_dist(
+            dist_files=dist_files,
+            description='long description\r'
+        )
+        cmd = upload(dist)
+        cmd.show_response = 1
+        cmd.ensure_finalized()
+        cmd.run()
+
+        headers = dict(self.last_open.req.headers)
+        self.assertEqual(headers['Content-length'], '2172')
+        self.assertIn(b'long description\r', self.last_open.req.data)
+
     def test_upload_fails(self):
         self.next_msg = "Not Found"
         self.next_code = 404

Misc/NEWS.d/next/Library/2018-01-21-16-33-53.bpo-32304.TItrNv.rst

@@ -0,0 +1,2 @@
+distutils' upload command no longer corrupts tar files ending with a CR byte,
+and no longer tries to convert CR to CRLF in any of the upload text fields.