Track all renames in redis

lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb

@@ -114,6 +114,11 @@ module Gitlab
             end
           end
 
+          def track_rename(type, old_path, new_path)
+            key = "rename:#{migration.version}:#{type}"
+            Gitlab::Redis.with { |redis| redis.lpush(key, [old_path, new_path].to_json) }
+          end
+
           def file_storage?
             CarrierWave::Uploader::Base.storage == CarrierWave::Storage::File
           end

lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces.rb

@@ -26,6 +26,8 @@ module Gitlab
           def rename_namespace(namespace)
             old_full_path, new_full_path = rename_path_for_routable(namespace)
 
+            track_rename('namespace', old_full_path, new_full_path)
+
             move_repositories(namespace, old_full_path, new_full_path)
             move_uploads(old_full_path, new_full_path)
             move_pages(old_full_path, new_full_path)

lib/gitlab/database/rename_reserved_paths_migration/v1/rename_projects.rb

@@ -16,6 +16,8 @@ module Gitlab
           def rename_project(project)
             old_full_path, new_full_path = rename_path_for_routable(project)
 
+            track_rename('project', old_full_path, new_full_path)
+
             move_repository(project, old_full_path, new_full_path)
             move_repository(project, "#{old_full_path}.wiki", "#{new_full_path}.wiki")
             move_uploads(old_full_path, new_full_path)

spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base_spec.rb

@@ -203,4 +203,21 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameBase, :trunca
       expect(File.exist?(expected_file)).to be(true)
     end
   end
+
+  describe '#track_rename', redis: true do
+    it 'tracks a rename in redis' do
+      key = 'rename:20170316163845:namespace'
+
+      subject.track_rename('namespace', 'path/to/namespace', 'path/to/renamed')
+
+      old_path, new_path = [nil, nil]
+      Gitlab::Redis.with do |redis|
+        rename_info = redis.lpop(key)
+        old_path, new_path = JSON.parse(rename_info)
+      end
+
+      expect(old_path).to eq('path/to/namespace')
+      expect(new_path).to eq('path/to/renamed')
+    end
+  end
 end

spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb

@@ -191,6 +191,13 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces, :
 
       subject.rename_namespace(user.namespace)
     end
+
+    it 'tracks the rename' do
+      expect(subject).to receive(:track_rename)
+                           .with('namespace', 'the-path', 'the-path0')
+
+      subject.rename_namespace(namespace)
+    end
   end
 
   describe '#rename_user' do

spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_projects_spec.rb

@@ -85,6 +85,13 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameProjects, :tr
 
       subject.rename_project(project)
     end
+
+    it 'tracks the rename' do
+      expect(subject).to receive(:track_rename)
+                           .with('project', 'known-parent/the-path', 'known-parent/the-path0')
+
+      subject.rename_project(project)
+    end
   end
 
   describe '#move_repository' do

spec/support/fake_migration_classes.rb

 class FakeRenameReservedPathMigrationV1 < ActiveRecord::Migration
   include Gitlab::Database::RenameReservedPathsMigration::V1
+
+  def version
+    '20170316163845'
+  end
 end