Backfill project_repositories for legacy storage projects

Adds a background migration that will ensure all projects that
are on legacy storage have a row in `project_repositories`.

1 files changed, 26 insertions, 0 deletions

diff --git a/db/post_migrate/20181218192239_backfill_project_repositories_for_legacy_storage_projects.rb b/db/post_migrate/20181218192239_backfill_project_repositories_for_legacy_storage_projects.rb
new file mode 100644
index 00000000000..42f96750789
--- /dev/null
+++ b/db/post_migrate/20181218192239_backfill_project_repositories_for_legacy_storage_projects.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class BackfillProjectRepositoriesForLegacyStorageProjects < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME       = false
+  BATCH_SIZE     = 1_000
+  DELAY_INTERVAL = 5.minutes
+  MIGRATION      = 'BackfillLegacyProjectRepositories'
+
+  disable_ddl_transaction!
+
+  class Project < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'projects'
+  end
+
+  def up
+    queue_background_migration_jobs_by_range_at_intervals(Project, MIGRATION, DELAY_INTERVAL)
+  end
+
+  def down
+    # no-op: since there could have been existing rows before the migration do not remove anything
+  end
+end