Fixed #31402 -- Added migrate --check option.

Command exits with non-zero status if unapplied migrations exist.

1 files changed, 10 insertions, 0 deletions

diff --git a/django/core/management/commands/migrate.py b/django/core/management/commands/migrate.py
index 575ed47993..85e04b6fcc 100644
--- a/django/core/management/commands/migrate.py
+++ b/django/core/management/commands/migrate.py
@@ -1,3 +1,4 @@
+import sys
 import time
 from importlib import import_module
 
@@ -62,6 +63,10 @@ class Command(BaseCommand):
             '--run-syncdb', action='store_true',
             help='Creates tables for apps without migrations.',
         )
+        parser.add_argument(
+            '--check', action='store_true', dest='check_unapplied',
+            help='Exits with a non-zero status if unapplied migrations exist.',
+        )
 
     @no_translations
     def handle(self, *args, **options):
@@ -143,6 +148,7 @@ class Command(BaseCommand):
             targets = executor.loader.graph.leaf_nodes()
 
         plan = executor.migration_plan(targets)
+        exit_dry = plan and options['check_unapplied']
 
         if options['plan']:
             self.stdout.write('Planned operations:', self.style.MIGRATE_LABEL)
@@ -154,7 +160,11 @@ class Command(BaseCommand):
                     message, is_error = self.describe_operation(operation, backwards)
                     style = self.style.WARNING if is_error else None
                     self.stdout.write('    ' + message, style)
+            if exit_dry:
+                sys.exit(1)
             return
+        if exit_dry:
+            sys.exit(1)
 
         # At this point, ignore run_syncdb if there aren't any apps to sync.
         run_syncdb = options['run_syncdb'] and executor.loader.unmigrated_apps