Removed BaseCommand.stdin introduced in 116d39842d.

This option is not actually very useful in the general case
because it doesn't override sys.stdin.

It's still marginally useful for testing some features of
the createsuperuser command so it was moved there.
This commit also makes the detection of a TTY in createsuperuser
a bit more robust, after a suggestion of appolo13.

django/contrib/auth/management/commands/createsuperuser.py

@@ -50,6 +50,10 @@ class Command(BaseCommand):
     option_list = BaseCommand.option_list
     help = 'Used to create a superuser.'
 
+    def execute(self, *args, **options):
+        self.stdin = options.get('stdin', sys.stdin)  # Used for testing
+        return super(Command, self).execute(*args, **options)
+
     def handle(self, *args, **options):
         username = options.get(self.UserModel.USERNAME_FIELD, None)
         interactive = options.get('interactive')
@@ -84,7 +88,7 @@ class Command(BaseCommand):
             default_username = get_default_username()
             try:
 
-                if not self.stdin.isatty():
+                if hasattr(self.stdin, 'isatty') and not self.stdin.isatty():
                     raise NotRunningInTTYException("Not running in a TTY")
 
                 # Get a username

django/contrib/auth/tests/test_management.py

@@ -2,6 +2,7 @@ from __future__ import unicode_literals
 
 from datetime import date
 import locale
+import sys
 
 from django.apps import apps
 from django.contrib.auth import models, management
@@ -309,6 +310,34 @@ class CreatesuperuserManagementCommandTestCase(TestCase):
         self.assertEqual(User._default_manager.count(), 0)
         self.assertIn("Superuser creation skipped", out.getvalue())
 
+    def test_passing_stdin(self):
+        """
+        You can pass a stdin object as an option and it should be
+        available on self.stdin.
+        If no such option is passed, it defaults to sys.stdin.
+        """
+
+        user_data = {'username': 'foo', 'email': 'foo@example.com'}
+        sentinel = object()
+        command = createsuperuser.Command()
+        command.execute(
+            stdin=sentinel,
+            stdout=six.StringIO(),
+            interactive=False,
+            username='janet',
+            email='janet@example.com',
+        )
+        self.assertIs(command.stdin, sentinel)
+
+        command = createsuperuser.Command()
+        command.execute(
+            stdout=six.StringIO(),
+            interactive=False,
+            username='joe',
+            email='joe@example.com',
+        )
+        self.assertIs(command.stdin, sys.stdin)
+
 
 class CustomUserModelValidationTestCase(TestCase):
     @override_settings(AUTH_USER_MODEL='auth.CustomUserNonListRequiredFields')

django/core/management/base.py

@@ -306,7 +306,6 @@ class BaseCommand(object):
             self.stderr = OutputWrapper(options.get('stderr', sys.stderr))
         else:
             self.stderr = OutputWrapper(options.get('stderr', sys.stderr), self.style.ERROR)
-        self.stdin = options.get('stdin', sys.stdin)  # Useful for testing
 
         if self.can_import_settings:
             from django.conf import settings  # NOQA