Merge branch '327098-steal-traversal-ids-background-migrations' into 'master'

Ensure traversal_ids background migrations are complete

See merge request gitlab-org/gitlab!65510

db/post_migrate/20220412044906_finalize_traversal_ids_background_migrations.rb

+# frozen_string_literal: true
+
+class FinalizeTraversalIdsBackgroundMigrations < Gitlab::Database::Migration[1.0]
+  def up
+    finalize_background_migration('BackfillNamespaceTraversalIdsRoots')
+    finalize_background_migration('BackfillNamespaceTraversalIdsChildren')
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20220412044906

+1d6ed98ad2da7be75e09d853db86905ed1fb1847d387cc6d1980ff5516db06d9
\ No newline at end of file

spec/migrations/finalize_traversal_ids_background_migrations_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!('finalize_traversal_ids_background_migrations')
+
+RSpec.describe FinalizeTraversalIdsBackgroundMigrations, :migration do
+  shared_context 'incomplete background migration' do
+    before do
+      # Jobs enqueued in Sidekiq.
+      Sidekiq::Testing.disable! do
+        BackgroundMigrationWorker.perform_in(10, job_class_name, [1, 2, 100])
+        BackgroundMigrationWorker.perform_in(20, job_class_name, [3, 4, 100])
+      end
+
+      # Jobs tracked in the database.
+      # table(:background_migration_jobs).create!(
+      Gitlab::Database::BackgroundMigrationJob.create!(
+        class_name: job_class_name,
+        arguments: [5, 6, 100],
+        status: Gitlab::Database::BackgroundMigrationJob.statuses['pending']
+      )
+      # table(:background_migration_jobs).create!(
+      Gitlab::Database::BackgroundMigrationJob.create!(
+        class_name: job_class_name,
+        arguments: [7, 8, 100],
+        status: Gitlab::Database::BackgroundMigrationJob.statuses['succeeded']
+      )
+    end
+  end
+
+  context 'BackfillNamespaceTraversalIdsRoots background migration' do
+    let(:job_class_name) { 'BackfillNamespaceTraversalIdsRoots' }
+
+    include_context 'incomplete background migration'
+
+    before do
+      migrate!
+    end
+
+    it_behaves_like(
+      'finalized tracked background migration',
+      Gitlab::BackgroundMigration::BackfillNamespaceTraversalIdsRoots
+    )
+  end
+
+  context 'BackfillNamespaceTraversalIdsChildren background migration' do
+    let(:job_class_name) { 'BackfillNamespaceTraversalIdsChildren' }
+
+    include_context 'incomplete background migration'
+
+    before do
+      migrate!
+    end
+
+    it_behaves_like(
+      'finalized tracked background migration',
+      Gitlab::BackgroundMigration::BackfillNamespaceTraversalIdsChildren
+    )
+  end
+end