1 files changed, 83 insertions, 0 deletions
diff --git a/lib/gitlab/hashed_storage/rake_helper.rb b/lib/gitlab/hashed_storage/rake_helper.rb
new file mode 100644
index 00000000000..303b05e6a9a
--- /dev/null
+++ b/lib/gitlab/hashed_storage/rake_helper.rb
@@ -0,0 +1,83 @@
+module Gitlab
+  module HashedStorage
+    module RakeHelper
+      def self.batch_size
+        ENV.fetch('BATCH', 200).to_i
+      end
+
+      def self.listing_limit
+        ENV.fetch('LIMIT', 500).to_i
+      end
+
+      def self.range_from
+        ENV['ID_FROM']
+      end
+
+      def self.range_to
+        ENV['ID_TO']
+      end
+
+      def self.range_single_item?
+        !range_from.nil? && range_from == range_to
+      end
+
+      def self.project_id_batches(&block)
+        Project.with_unmigrated_storage.in_batches(of: batch_size, start: range_from, finish: range_to) do |relation| # rubocop: disable Cop/InBatches
+          ids = relation.pluck(:id)
+
+          yield ids.min, ids.max
+        end
+      end
+
+      def self.legacy_attachments_relation
+        Upload.joins(<<~SQL).where('projects.storage_version < :version OR projects.storage_version IS NULL', version: Project::HASHED_STORAGE_FEATURES[:attachments])
+          JOIN projects
+            ON (uploads.model_type='Project' AND uploads.model_id=projects.id)
+        SQL
+      end
+
+      def self.hashed_attachments_relation
+        Upload.joins(<<~SQL).where('projects.storage_version >= :version', version: Project::HASHED_STORAGE_FEATURES[:attachments])
+          JOIN projects
+          ON (uploads.model_type='Project' AND uploads.model_id=projects.id)
+        SQL
+      end
+
+      def self.relation_summary(relation_name, relation)
+        relation_count = relation.count
+        $stdout.puts "* Found #{relation_count} #{relation_name}".color(:green)
+
+        relation_count
+      end
+
+      def self.projects_list(relation_name, relation)
+        listing(relation_name, relation.with_route) do |project|
+          $stdout.puts "  - #{project.full_path} (id: #{project.id})".color(:red)
+        end
+      end
+
+      def self.attachments_list(relation_name, relation)
+        listing(relation_name, relation) do |upload|
+          $stdout.puts "  - #{upload.path} (id: #{upload.id})".color(:red)
+        end
+      end
+
+      def self.listing(relation_name, relation)
+        relation_count = relation_summary(relation_name, relation)
+        return unless relation_count > 0
+
+        limit = listing_limit
+
+        if relation_count > limit
+          $stdout.puts "  ! Displaying first #{limit} #{relation_name}..."
+        end
+
+        relation.find_each(batch_size: batch_size).with_index do |element, index|
+          yield element
+
+          break if index + 1 >= limit
+        end
+      end
+    end
+  end
+end