Revert "Merge branch '50070-legacy-attachments' into 'master'"

This reverts commit fd19f887dfeeeedb483c4a4fb32f9f768e89389c, reversing
changes made to abb2d4c601d796339c8d7cb0c00946696730f198.

1 files changed, 0 insertions, 128 deletions

diff --git a/lib/gitlab/background_migration/migrate_legacy_uploads.rb b/lib/gitlab/background_migration/migrate_legacy_uploads.rb
deleted file mode 100644
index af1ad930aed..00000000000
--- a/lib/gitlab/background_migration/migrate_legacy_uploads.rb
+++ /dev/null
@@ -1,128 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module BackgroundMigration
-    # This migration takes all legacy uploads (that were uploaded using AttachmentUploader)
-    # and migrate them to the new (FileUploader) location (=under projects).
-    #
-    # We have dependencies (uploaders) in this migration because extracting code would add a lot of complexity
-    # and possible errors could appear as the logic in the uploaders is not trivial.
-    #
-    # This migration will be removed in 12.4 in order to get rid of a migration that depends on
-    # the application code.
-    class MigrateLegacyUploads
-      include Database::MigrationHelpers
-      include ::Gitlab::Utils::StrongMemoize
-
-      # This class takes a legacy upload and migrates it to the correct location
-      class UploadMover
-        include Gitlab::Utils::StrongMemoize
-
-        attr_reader :upload, :project, :note
-
-        def initialize(upload)
-          @upload = upload
-          @note = Note.find_by(id: upload.model_id)
-          @project = note&.project
-        end
-
-        def execute
-          return unless upload
-
-          if !project
-            # if we don't have models associated with the upload we can not move it
-            say "MigrateLegacyUploads: Deleting upload due to model not found: #{upload.inspect}"
-            destroy_legacy_upload
-          elsif note.is_a?(LegacyDiffNote)
-            handle_legacy_note_upload
-          elsif !legacy_file_exists?
-            # if we can not find the file we just remove the upload record
-            say "MigrateLegacyUploads: Deleting upload due to file not found: #{upload.inspect}"
-            destroy_legacy_upload
-          else
-            migrate_upload
-          end
-        end
-
-        private
-
-        def migrate_upload
-          return unless copy_upload_to_project
-
-          add_upload_link_to_note_text
-          destroy_legacy_file
-          destroy_legacy_upload
-        end
-
-        # we should proceed and log whenever one upload copy fails, no matter the reasons
-        # rubocop: disable Lint/RescueException
-        def copy_upload_to_project
-          @uploader = FileUploader.copy_to(legacy_file_uploader, project)
-
-          say "MigrateLegacyUploads: Copied file #{legacy_file_uploader.file.path} -> #{@uploader.file.path}"
-          true
-        rescue Exception => e
-          say "MigrateLegacyUploads: File #{legacy_file_uploader.file.path} couldn't be copied to project uploads. Error: #{e.message}"
-          false
-        end
-        # rubocop: enable Lint/RescueException
-
-        def destroy_legacy_upload
-          note.remove_attachment = true
-          note.save
-
-          if upload.destroy
-            say "MigrateLegacyUploads: Upload #{upload.inspect} was destroyed."
-          else
-            say "MigrateLegacyUploads: Upload #{upload.inspect} destroy failed."
-          end
-        end
-
-        def destroy_legacy_file
-          legacy_file_uploader.file.delete
-        end
-
-        def add_upload_link_to_note_text
-          new_text = "#{note.note} \n #{@uploader.markdown_link}"
-          note.update!(
-            note: new_text
-          )
-        end
-
-        def legacy_file_uploader
-          strong_memoize(:legacy_file_uploader) do
-            uploader = upload.build_uploader
-            uploader.retrieve_from_store!(File.basename(upload.path))
-            uploader
-          end
-        end
-
-        def legacy_file_exists?
-          legacy_file_uploader.file.exists?
-        end
-
-        def handle_legacy_note_upload
-          note.note += "\n \n Attachment ##{upload.id} with URL \"#{note.attachment.url}\" failed to migrate \
-               for model class #{note.class}. See #{help_doc_link}."
-          note.save
-
-          say "MigrateLegacyUploads: LegacyDiffNote ##{note.id} found, can't move the file: #{upload.inspect} for upload ##{upload.id}. See #{help_doc_link}."
-        end
-
-        def say(message)
-          Rails.logger.info(message)
-        end
-
-        def help_doc_link
-          'https://docs.gitlab.com/ee/administration/troubleshooting/migrations.html#legacy-upload-migration'
-        end
-      end
-
-      def perform(start_id, end_id)
-        Upload.where(id: start_id..end_id, uploader: 'AttachmentUploader').find_each do |upload|
-          UploadMover.new(upload).execute
-        end
-      end
-    end
-  end
-end