Merge pull request #656 from mythmon/clear-signatures

recipe-server: Add migration to remove recipe signatures again

recipe-server/normandy/recipes/migrations/0041_remove_invalid_signatures.py

@@ -0,0 +1,40 @@
+"""
+Removes signatures, so they can be easily recreated during deployment.
+
+This migration is intended to be used between "eras" of signatures. As
+the serialization format of recipes changes, the signatures need to
+also change. This could be handled automatically, but it is easier to
+deploy if we just remove everything in a migration, and allow the
+normal processes to regenerate the signatures.
+"""
+
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def remove_signatures(apps, schema_editor):
+    Recipe = apps.get_model('recipes', 'Recipe')
+    Signature = apps.get_model('recipes', 'Signature')
+
+    for recipe in Recipe.objects.exclude(signature=None):
+        sig = recipe.signature
+        recipe.signature = None
+        recipe.save()
+        sig.delete()
+
+    for sig in Signature.objects.all():
+        sig.delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('recipes', '0040_approvalrequest_comment'),
+    ]
+
+    operations = [
+        # This function as both a forward and reverse migration
+        migrations.RunPython(remove_signatures, remove_signatures),
+    ]