Adjust pulp2_last_updated date for the copied errata.

Needed in order to allow user (e.g. Katello) to identify content changed since the last run.
Pulp 2 copy operation doesn't update timestamps.

re #8417

pulp_2to3_migration/app/migrations/0027_pulp2repocontent_created_index.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.2.19 on 2021-03-22 13:01
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pulp_2to3_migration', '0026_p2content_UQ'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='pulp2repocontent',
+            index=models.Index(fields=['pulp2_created'], name='pulp_2to3_m_pulp2_c_267ffa_idx'),
+        ),
+    ]

pulp_2to3_migration/app/models/repository.py

@@ -94,6 +94,7 @@ class Meta:
         unique_together = ('pulp2_repository', 'pulp2_unit_id')
         indexes = [
             models.Index(fields=['pulp2_content_type_id']),
+            models.Index(fields=['pulp2_created'])
         ]
 
 

pulp_2to3_migration/app/pre_migration.py

@@ -259,8 +259,8 @@ def pre_migrate_content_type(content_model, mutable_type, lazy_type, premigrate_
         ).select_related(
             'pulp2_repository'
         ).only(
-            'pulp2_repository'
-        )
+            'pulp2_repository', 'pulp2_created',
+        ).order_by('pulp2_created')
 
         mongo_content_qs = content_model.pulp2.objects(
             id__in=content_relations.values_list('pulp2_unit_id', flat=True))
@@ -278,15 +278,21 @@ def pre_migrate_content_type(content_model, mutable_type, lazy_type, premigrate_
                 pulp2_subid='',
             )
 
-            # Ensure that no existing pulp2content with slipped into bulk_create.
+            # Ensure that no existing pulp2content slipped into bulk_create.
             # Otherwise, we'll have a problem with later bulk_create for detail models.
             if Pulp2Content.objects.filter(specific_content_q).exists():
                 continue
 
             item = Pulp2Content(
                 pulp2_id=record.id,
                 pulp2_content_type_id=record._content_type_id,
-                pulp2_last_updated=record._last_updated,
+                # Set `pulp2_last_updated` to the date of when a content unit got copied.
+                # (We can't set it to anything higher, in case pre-migration crashes and we would
+                # need to pick it up correctly on the next re-run.)
+                # When erratum is copied in pulp 2, it doesn't change its _last_updated timestamp.
+                # It means that Katello has no way to identify that the erratum has been copied
+                # since the last migration run, without reimporting all errata, which is expensive.
+                pulp2_last_updated=int(relation.pulp2_created.timestamp()),
                 pulp2_storage_path=record._storage_path,
                 downloaded=downloaded,
                 pulp2_repo=relation.pulp2_repository