Fixed #29506 -- Added validation for migrate's app_label option.

Thanks MyungSeKyo for the report and the initial patch.

django/core/management/commands/migrate.py

@@ -100,12 +100,18 @@ class Command(BaseCommand):
 
         # If they supplied command line arguments, work out what they mean.
         target_app_labels_only = True
-        if options['app_label'] and options['migration_name']:
-            app_label, migration_name = options['app_label'], options['migration_name']
+        if options['app_label']:
+            # Validate app_label.
+            app_label = options['app_label']
+            try:
+                apps.get_app_config(app_label)
+            except LookupError as err:
+                raise CommandError(str(err))
             if app_label not in executor.loader.migrated_apps:
-                raise CommandError(
-                    "App '%s' does not have migrations." % app_label
-                )
+                raise CommandError("App '%s' does not have migrations." % app_label)
+
+        if options['app_label'] and options['migration_name']:
+            migration_name = options['migration_name']
             if migration_name == "zero":
                 targets = [(app_label, None)]
             else:
@@ -123,11 +129,6 @@ class Command(BaseCommand):
                 targets = [(app_label, migration.name)]
             target_app_labels_only = False
         elif options['app_label']:
-            app_label = options['app_label']
-            if app_label not in executor.loader.migrated_apps:
-                raise CommandError(
-                    "App '%s' does not have migrations." % app_label
-                )
             targets = [key for key in executor.loader.graph.leaf_nodes() if key[0] == app_label]
         else:
             targets = executor.loader.graph.leaf_nodes()

tests/migrations/test_commands.py

@@ -1425,3 +1425,11 @@ class AppLabelErrorTests(TestCase):
         with self.assertRaises(SystemExit):
             call_command('makemigrations', 'django.contrib.auth', stderr=err)
         self.assertIn(self.did_you_mean_auth_error, err.getvalue())
+
+    def test_migrate_nonexistent_app_label(self):
+        with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
+            call_command('migrate', 'nonexistent_app')
+
+    def test_migrate_app_name_specified_as_label(self):
+        with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
+            call_command('migrate', 'django.contrib.auth')