[cherry-pick] wip: port object storage to ce

lib/tasks/gitlab/uploads/check.rake

+require_relative 'helpers'
+
 namespace :gitlab do
   namespace :uploads do
     desc 'GitLab | Uploads | Check integrity of uploaded files'
     task check: :environment do
-      Gitlab::Verify::RakeTask.run!(Gitlab::Verify::Uploads)
+      include UploadTaskHelpers
+
+      puts 'Checking integrity of uploaded files'
+
+      uploads_batches do |batch|
+        batch.each do |upload|
+          begin
+            puts "- Checking file (#{upload.id}): #{upload.absolute_path}".color(:green)
+
+            if upload.exist?
+              check_checksum(upload)
+            else
+              puts "  * File does not exist on the file system".color(:red)
+            end
+          rescue ObjectStorage::RemoteStoreError
+            puts "- File (#{upload.id}): File is stored remotely, skipping".color(:yellow)
+          end
+        end
+      end
+
+      puts 'Done!'
     end
   end
 end

lib/tasks/gitlab/uploads/helpers.rb

+module UploadTaskHelpers
+  def batch_size
+    ENV.fetch('BATCH', 200).to_i
+  end
+
+  def calculate_checksum(absolute_path)
+    Digest::SHA256.file(absolute_path).hexdigest
+  end
+
+  def check_checksum(upload)
+    checksum = calculate_checksum(upload.absolute_path)
+
+    if checksum != upload.checksum
+      puts "  * File checksum (#{checksum}) does not match the one in the database (#{upload.checksum})".color(:red)
+    end
+  end
+
+  def uploads_batches(&block)
+    Upload.all.in_batches(of: batch_size, start: ENV['ID_FROM'], finish: ENV['ID_TO']) do |relation| # rubocop: disable Cop/InBatches
+      yield relation
+    end
+  end
+end