Fix a couple spinner edge cases.

news/6312.bugfix

+The spinner no longer displays a completion message after subprocess calls
+not needing a spinner. It also no longer incorrectly reports an error after
+certain subprocess calls to Git that succeeded.

src/pip/_internal/utils/misc.py

@@ -705,6 +705,10 @@ def call_subprocess(
         stdout = None
     else:
         stdout = subprocess.PIPE
+
+    # Only use the spinner when we're capturing stdout and we have one.
+    use_spinner = not show_stdout and spinner is not None
+
     if command_desc is None:
         command_desc = format_command_args(cmd)
 
@@ -738,19 +742,22 @@ def call_subprocess(
                 logger.debug(line)
             else:
                 # Update the spinner
-                if spinner is not None:
+                if use_spinner:
                     spinner.spin()
     try:
         proc.wait()
     finally:
         if proc.stdout:
             proc.stdout.close()
-    if spinner is not None:
-        if proc.returncode:
+    proc_had_error = (
+        proc.returncode and proc.returncode not in extra_ok_returncodes
+    )
+    if use_spinner:
+        if proc_had_error:
             spinner.finish("error")
         else:
             spinner.finish("done")
-    if proc.returncode and proc.returncode not in extra_ok_returncodes:
+    if proc_had_error:
         if on_returncode == 'raise':
             if (logger.getEffectiveLevel() > std_logging.DEBUG and
                     not show_stdout):

tests/unit/test_utils.py

@@ -925,7 +925,7 @@ class TestCallSubprocess(object):
         # output is already being written to the console.
         self.check_result(
             capfd, caplog, log_level, spinner, result, expected,
-            expected_spinner=(0, 'done'),
+            expected_spinner=(0, None),
         )
 
     @pytest.mark.parametrize((
@@ -936,13 +936,13 @@ class TestCallSubprocess(object):
             # Test some cases that should result in show_spinner false.
             (0, False, None, logging.DEBUG, (None, 'done', 0)),
             # Test show_stdout=True.
-            (0, True, None, logging.DEBUG, (None, 'done', 0)),
-            (0, True, None, logging.INFO, (None, 'done', 0)),
-            (0, True, None, logging.WARNING, (None, 'done', 0)),
+            (0, True, None, logging.DEBUG, (None, None, 0)),
+            (0, True, None, logging.INFO, (None, None, 0)),
+            (0, True, None, logging.WARNING, (None, None, 0)),
             # Test a non-zero exit status.
             (3, False, None, logging.INFO, (InstallationError, 'error', 2)),
             # Test a non-zero exit status also in extra_ok_returncodes.
-            (3, False, (3, ), logging.INFO, (None, 'error', 2)),
+            (3, False, (3, ), logging.INFO, (None, 'done', 2)),
     ])
     def test_spinner_finish(
         self, exit_status, show_stdout, extra_ok_returncodes, log_level,