Fixed #29518 -- Added validation for sqlmigrate's app_label argument.

AUTHORS

@@ -739,6 +739,7 @@ answer newbie questions, and generally made Django that much better:
     Sean Brant
     Sebastian Hillig <sebastian.hillig@gmail.com>
     Sebastian Spiegel <http://www.tivix.com/>
+    Segyo Myung <myungsekyo@gmail.com>
     Selwin Ong <selwin@ui.co.id>
     Sengtha Chay <sengtha@e-khmer.com>
     Senko Rašić <senko.rasic@dobarkod.hr>

django/core/management/commands/sqlmigrate.py

+from django.apps import apps
 from django.core.management.base import BaseCommand, CommandError
 from django.db import DEFAULT_DB_ALIAS, connections
 from django.db.migrations.executor import MigrationExecutor
@@ -37,6 +38,11 @@ class Command(BaseCommand):
 
         # Resolve command-line arguments into a migration
         app_label, migration_name = options['app_label'], options['migration_name']
+        # Validate 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)
         try:

tests/migrations/test_commands.py

@@ -1434,6 +1434,14 @@ class AppLabelErrorTests(TestCase):
         with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
             call_command('migrate', 'django.contrib.auth')
 
+    def test_sqlmigrate_nonexistent_app_label(self):
+        with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
+            call_command('sqlmigrate', 'nonexistent_app', '0002')
+
+    def test_sqlmigrate_app_name_specified_as_label(self):
+        with self.assertRaisesMessage(CommandError, self.did_you_mean_auth_error):
+            call_command('sqlmigrate', 'django.contrib.auth', '0002')
+
     def test_squashmigrations_nonexistent_app_label(self):
         with self.assertRaisesMessage(CommandError, self.nonexistent_app_error):
             call_command('squashmigrations', 'nonexistent_app', '0002')