[5.2.x] Fixed #36224 -- Fixed shell imports when settings not configured.

Thank you Raffaella for the report. Thank you Tim Schilling and Natalia Bidart
for the reviews.

Backport of de1117ea8eabe0ee0aa048e5a4e249eab7c4245e from main.

django/core/management/commands/shell.py

@@ -6,6 +6,7 @@ from collections import defaultdict
 from importlib import import_module
 
 from django.apps import apps
+from django.core.exceptions import AppRegistryNotReady
 from django.core.management import BaseCommand, CommandError
 from django.utils.datastructures import OrderedSet
 from django.utils.module_loading import import_string as import_dotted_path
@@ -150,6 +151,22 @@ class Command(BaseCommand):
         if options and options.get("no_imports"):
             return {}
 
+        verbosity = options["verbosity"] if options else 0
+
+        try:
+            apps.check_models_ready()
+        except AppRegistryNotReady:
+            if verbosity > 0:
+                settings_env_var = os.getenv("DJANGO_SETTINGS_MODULE")
+                self.stdout.write(
+                    "Automatic imports are disabled since settings are not configured."
+                    f"\nDJANGO_SETTINGS_MODULE value is {settings_env_var!r}.\n"
+                    "HINT: Ensure that the settings module is configured and set.",
+                    self.style.ERROR,
+                    ending="\n\n",
+                )
+            return {}
+
         path_imports = self.get_auto_imports()
         if path_imports is None:
             return {}
@@ -175,7 +192,6 @@ class Command(BaseCommand):
             name: obj for items in auto_imports.values() for name, obj in items
         }
 
-        verbosity = options["verbosity"] if options else 0
         if verbosity < 1:
             return namespace
 
@@ -228,7 +244,7 @@ class Command(BaseCommand):
     def handle(self, **options):
         # Execute the command and exit.
         if options["command"]:
-            exec(options["command"], {**globals(), **self.get_namespace()})
+            exec(options["command"], {**globals(), **self.get_namespace(**options)})
             return
 
         # Execute stdin if it has anything to read and exit.
@@ -238,7 +254,7 @@ class Command(BaseCommand):
             and not sys.stdin.isatty()
             and select.select([sys.stdin], [], [], 0)[0]
         ):
-            exec(sys.stdin.read(), {**globals(), **self.get_namespace()})
+            exec(sys.stdin.read(), {**globals(), **self.get_namespace(**options)})
             return
 
         available_shells = (

tests/shell/tests.py

@@ -1,3 +1,5 @@
+import os
+import subprocess
 import sys
 import unittest
 from unittest import mock
@@ -23,25 +25,85 @@ class ShellCommandTestCase(SimpleTestCase):
 
     def test_command_option(self):
         with self.assertLogs("test", "INFO") as cm:
-            call_command(
-                "shell",
-                command=(
-                    "import django; from logging import getLogger; "
-                    'getLogger("test").info(django.__version__)'
-                ),
-            )
+            with captured_stdout():
+                call_command(
+                    "shell",
+                    command=(
+                        "import django; from logging import getLogger; "
+                        'getLogger("test").info(django.__version__)'
+                    ),
+                )
         self.assertEqual(cm.records[0].getMessage(), __version__)
 
     def test_command_option_globals(self):
         with captured_stdout() as stdout:
-            call_command("shell", command=self.script_globals)
+            call_command("shell", command=self.script_globals, verbosity=0)
         self.assertEqual(stdout.getvalue().strip(), "True")
 
     def test_command_option_inline_function_call(self):
         with captured_stdout() as stdout:
-            call_command("shell", command=self.script_with_inline_function)
+            call_command("shell", command=self.script_with_inline_function, verbosity=0)
         self.assertEqual(stdout.getvalue().strip(), __version__)
 
+    @override_settings(INSTALLED_APPS=["shell"])
+    def test_no_settings(self):
+        test_environ = os.environ.copy()
+        if "DJANGO_SETTINGS_MODULE" in test_environ:
+            del test_environ["DJANGO_SETTINGS_MODULE"]
+        error = (
+            "Automatic imports are disabled since settings are not configured.\n"
+            "DJANGO_SETTINGS_MODULE value is None.\n"
+            "HINT: Ensure that the settings module is configured and set.\n\n"
+        )
+        for verbosity, assertError in [
+            ("0", self.assertNotIn),
+            ("1", self.assertIn),
+            ("2", self.assertIn),
+        ]:
+            with self.subTest(verbosity=verbosity, get_auto_imports="models"):
+                p = subprocess.run(
+                    [
+                        sys.executable,
+                        "-m",
+                        "django",
+                        "shell",
+                        "-c",
+                        "print(globals())",
+                        "-v",
+                        verbosity,
+                    ],
+                    capture_output=True,
+                    env=test_environ,
+                    text=True,
+                    umask=-1,
+                )
+                assertError(error, p.stdout)
+                self.assertNotIn("Marker", p.stdout)
+
+            with self.subTest(verbosity=verbosity, get_auto_imports="without-models"):
+                with mock.patch(
+                    "django.core.management.commands.shell.Command.get_auto_imports",
+                    return_value=["django.urls.resolve"],
+                ):
+                    p = subprocess.run(
+                        [
+                            sys.executable,
+                            "-m",
+                            "django",
+                            "shell",
+                            "-c",
+                            "print(globals())",
+                            "-v",
+                            verbosity,
+                        ],
+                        capture_output=True,
+                        env=test_environ,
+                        text=True,
+                        umask=-1,
+                    )
+                    assertError(error, p.stdout)
+                    self.assertNotIn("resolve", p.stdout)
+
     @unittest.skipIf(
         sys.platform == "win32", "Windows select() doesn't support file descriptors."
     )
@@ -50,7 +112,7 @@ class ShellCommandTestCase(SimpleTestCase):
         with captured_stdin() as stdin, captured_stdout() as stdout:
             stdin.write("print(100)\n")
             stdin.seek(0)
-            call_command("shell")
+            call_command("shell", verbosity=0)
         self.assertEqual(stdout.getvalue().strip(), "100")
 
     @unittest.skipIf(
@@ -62,7 +124,7 @@ class ShellCommandTestCase(SimpleTestCase):
         with captured_stdin() as stdin, captured_stdout() as stdout:
             stdin.write(self.script_globals)
             stdin.seek(0)
-            call_command("shell")
+            call_command("shell", verbosity=0)
         self.assertEqual(stdout.getvalue().strip(), "True")
 
     @unittest.skipIf(
@@ -74,7 +136,7 @@ class ShellCommandTestCase(SimpleTestCase):
         with captured_stdin() as stdin, captured_stdout() as stdout:
             stdin.write(self.script_with_inline_function)
             stdin.seek(0)
-            call_command("shell")
+            call_command("shell", verbosity=0)
         self.assertEqual(stdout.getvalue().strip(), __version__)
 
     def test_ipython(self):