Fixed #7423 -- Skip superuser creation when not running in a TTY.

Thanks to trac user galaxy4sale for the original report
and to AeroNotix for the patch.

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

@@ -17,6 +17,10 @@ from django.utils.six.moves import input
 from django.utils.text import capfirst
 
 
+class NotRunningInTTYException(Exception):
+    pass
+
+
 class Command(BaseCommand):
 
     def __init__(self, *args, **kwargs):
@@ -80,6 +84,9 @@ class Command(BaseCommand):
             default_username = get_default_username()
             try:
 
+                if not self.stdin.isatty():
+                    raise NotRunningInTTYException("Not running in a TTY")
+
                 # Get a username
                 verbose_field_name = self.username_field.verbose_name
                 while username is None:
@@ -136,8 +143,16 @@ class Command(BaseCommand):
                 self.stderr.write("\nOperation cancelled.")
                 sys.exit(1)
 
-        user_data[self.UserModel.USERNAME_FIELD] = username
-        user_data['password'] = password
-        self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
-        if verbosity >= 1:
-            self.stdout.write("Superuser created successfully.")
+            except NotRunningInTTYException:
+                self.stdout.write(
+                    "Superuser creation skipped due to not running in a TTY. "
+                    "You can run `manage.py createsuperuser` in your project "
+                    "to create one manually."
+                )
+
+        if username:
+            user_data[self.UserModel.USERNAME_FIELD] = username
+            user_data['password'] = password
+            self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
+            if verbosity >= 1:
+                self.stdout.write("Superuser created successfully.")

django/contrib/auth/tests/test_management.py

@@ -191,6 +191,27 @@ class CreatesuperuserManagementCommandTestCase(TestCase):
 
         self.assertEqual(CustomUser._default_manager.count(), 0)
 
+    def test_skip_if_not_in_TTY(self):
+        """
+        If the command is not called from a TTY, it should be skipped and a
+        message should be displayed (#7423).
+        """
+        class FakeStdin(object):
+            """A fake stdin object that has isatty() return False."""
+            def isatty(self):
+                return False
+
+        out = StringIO()
+        call_command(
+            "createsuperuser",
+            stdin=FakeStdin(),
+            stdout=out,
+            interactive=True,
+        )
+
+        self.assertEqual(User._default_manager.count(), 0)
+        self.assertIn("Superuser creation skipped", out.getvalue())
+
 
 class CustomUserModelValidationTestCase(TestCase):
     @override_settings(AUTH_USER_MODEL='auth.CustomUserNonListRequiredFields')