Revert "Merge branch '50070-legacy-attachments' into 'master'"sh-revert-mr-24679

This reverts commit fd19f887dfeeeedb483c4a4fb32f9f768e89389c, reversing
changes made to abb2d4c601d796339c8d7cb0c00946696730f198.

6 files changed, 4 insertions, 501 deletions

diff --git a/changelogs/unreleased/50070-legacy-attachments.yml b/changelogs/unreleased/50070-legacy-attachments.yml
deleted file mode 100644
index 95917f2b5b5..00000000000
--- a/changelogs/unreleased/50070-legacy-attachments.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-title: Migrate legacy uploads out of deprecated paths
-merge_request: 24679
-author:
-type: other
diff --git a/db/migrate/20190114184258_migrate_legacy_attachments.rb b/db/migrate/20190114184258_migrate_legacy_attachments.rb
deleted file mode 100644
index e9fb7952dc9..00000000000
--- a/db/migrate/20190114184258_migrate_legacy_attachments.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-# frozen_string_literal: true
-
-class MigrateLegacyAttachments < ActiveRecord::Migration[5.0]
-  include Gitlab::Database::MigrationHelpers
-
-  disable_ddl_transaction!
-
-  DOWNTIME = false
-
-  MIGRATION = 'MigrateLegacyUploads'.freeze
-  BATCH_SIZE = 5000
-  DELAY_INTERVAL = 5.minutes.to_i
-
-  class Upload < ActiveRecord::Base
-    self.table_name = 'uploads'
-
-    include ::EachBatch
-  end
-
-  def up
-    Upload.where(uploader: 'AttachmentUploader').each_batch(of: BATCH_SIZE) do |relation, index|
-      start_id, end_id = relation.pluck('MIN(id), MAX(id)').first
-      delay = index * DELAY_INTERVAL
-
-      BackgroundMigrationWorker.perform_in(delay, MIGRATION, [start_id, end_id])
-    end
-  end
-
-  # not needed
-  def down
-  end
-end
diff --git a/doc/administration/troubleshooting/migration.md b/doc/administration/troubleshooting/migration.md
deleted file mode 100644
index 4d2d268b9df..00000000000
--- a/doc/administration/troubleshooting/migration.md
+++ /dev/null
@@ -1,82 +0,0 @@
-# Migrations problems
-
-## Legacy upload migration
-
-> Introduced in GitLab 12.0.
-
-  The migration takes all attachments uploaded by legacy `AttachmentUploader` and
-  migrate them to the path that current uploaders expect.
-
-Although it should not usually happen there could possibly be some attachments belonging to
-LegacyDiffNotes. These attachments can't be seen before running the migration by users and
-they should not be present in your instance.
-
-However, if you have some of them, you will need to handle them manually.
-You can find the ids of failed notes in logs as "MigrateLegacyUploads: LegacyDiffNote"
-
-1. Run a Rails console:
-
-    ```sh
-    sudo gitlab-rails console production
-    ```
-
-    or for source installs:
-
-    ```sh
-    bundle exec rails console production
-    ```
-
- 1. Check the failed upload and find the note (you can see their ids in the logs)
-
-    ```ruby
-    upload = Upload.find(upload_id)
-    note = Note.find(note_id)
-    ```
-
-
- 1. Check the path - it should contain `system/note/attachment`
-
-    ```ruby
-    upload.absolut_path
-    ```
-    
- 1. Check the path in the uploader - it should differ from the upload path and should contain  `system/legacy_diff_note`
- 
-    ```ruby
-    uploader = upload.build_uploader
-    uploader.file
-    ```
-    
- 1. First, you need to move the file to the path that is expected from the uploader
-
-    ```ruby
-    old_path = upload.absolute_path
-    new_path = upload.absolute_path.sub('-/system/note/attachment', '-/system/legacy_diff_note')
-    new_dir = File.dirname(new_path)
-    FileUtils.mkdir_p(new_dir)
-    
-    FileUtils.mv(old_path, new_path)
-    ```
-
- 1. You then need to move the file to the `FileUploader` and create a new `Upload` object
- 
-    ```ruby
-    file_uploader = UploadService.new(note.project, File.read(new_path)).execute
-    ```
- 
- 1. And update the legacy note to contain the file.
- 
-    ```ruby
-    new_text = "#{note.note} \n #{file_uploader.markdown_link}"
-    note.update!(
-      note: new_text
-    )
-    ```
-
- 1. And finally, you can remove the old upload
- 
-    ```ruby
-    upload.destroy
-    ```
-
-If you have any problems feel free to contact [GitLab Support](https://about.gitlab.com/support/).
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
diff --git a/spec/factories/uploads.rb b/spec/factories/uploads.rb
index 52f6962f16b..426abdc2a6c 100644
--- a/spec/factories/uploads.rb
+++ b/spec/factories/uploads.rb
@@ -54,7 +54,10 @@ FactoryBot.define do
     end
 
     trait :attachment_upload do
-      mount_point :attachment
+      transient do
+        mount_point :attachment
+      end
+
       model { build(:note) }
       uploader "AttachmentUploader"
     end
diff --git a/spec/lib/gitlab/background_migration/migrate_legacy_uploads_spec.rb b/spec/lib/gitlab/background_migration/migrate_legacy_uploads_spec.rb
deleted file mode 100644
index 16b9de6a84e..00000000000
--- a/spec/lib/gitlab/background_migration/migrate_legacy_uploads_spec.rb
+++ /dev/null
@@ -1,253 +0,0 @@
-# frozen_string_literal: true
-require 'spec_helper'
-
-describe Gitlab::BackgroundMigration::MigrateLegacyUploads, :migration, schema: 20190103140724 do
-  let(:test_dir) { FileUploader.options['storage_path'] }
-
-  # rubocop: disable RSpec/FactoriesInMigrationSpecs
-  let(:namespace) { create(:namespace) }
-  let(:project) { create(:project, :legacy_storage, namespace: namespace) }
-  let(:issue) { create(:issue, project: project) }
-
-  let(:note1) { create(:note, note: 'some note text awesome', project: project, noteable: issue) }
-  let(:note2) { create(:note, note: 'some note', project: project, noteable: issue) }
-
-  let(:hashed_project) { create(:project, namespace: namespace) }
-  let(:issue_hashed_project) { create(:issue, project: hashed_project) }
-  let(:note_hashed_project) { create(:note, note: 'some note', project: hashed_project, attachment: 'text.pdf', noteable: issue_hashed_project) }
-
-  let(:standard_upload) do
-    create(:upload,
-      path: "secretabcde/image.png",
-      model_id: create(:project).id, model_type: 'Project', uploader: 'FileUploader')
-  end
-
-  before do
-    # This migration was created before we introduced ProjectCiCdSetting#default_git_depth
-    allow_any_instance_of(ProjectCiCdSetting).to receive(:default_git_depth).and_return(nil)
-    allow_any_instance_of(ProjectCiCdSetting).to receive(:default_git_depth=).and_return(0)
-
-    namespace
-    project
-    issue
-    note1
-    note2
-    hashed_project
-    issue_hashed_project
-    note_hashed_project
-    standard_upload
-  end
-
-  def create_remote_upload(model, filename)
-    create(:upload, :attachment_upload,
-           path: "note/attachment/#{model.id}/#{filename}", secret: nil,
-           store: ObjectStorage::Store::REMOTE, model: model)
-  end
-
-  def create_upload(model, filename, with_file = true)
-    params = {
-      path: "uploads/-/system/note/attachment/#{model.id}/#{filename}",
-      model: model,
-      store: ObjectStorage::Store::LOCAL
-    }
-
-    upload = if with_file
-               create(:upload, :with_file, :attachment_upload, params)
-             else
-               create(:upload, :attachment_upload, params)
-             end
-
-    model.update(attachment: upload.build_uploader)
-    model.attachment.upload
-  end
-
-  let(:start_id) { 1 }
-  let(:end_id) { 10000 }
-
-  def new_upload_legacy
-    Upload.find_by(model_id: project.id, model_type: 'Project')
-  end
-
-  def new_upload_hashed
-    Upload.find_by(model_id: hashed_project.id, model_type: 'Project')
-  end
-
-  shared_examples 'migrates files correctly' do
-    before do
-      described_class.new.perform(start_id, end_id)
-    end
-
-    it 'removes all the legacy upload records' do
-      expect(Upload.where(uploader: 'AttachmentUploader')).to be_empty
-
-      expect(standard_upload.reload).to eq(standard_upload)
-    end
-
-    it 'creates new upload records correctly' do
-      expect(new_upload_legacy.secret).not_to be_nil
-      expect(new_upload_legacy.path).to end_with("#{new_upload_legacy.secret}/image.png")
-      expect(new_upload_legacy.model_id).to eq(project.id)
-      expect(new_upload_legacy.model_type).to eq('Project')
-      expect(new_upload_legacy.uploader).to eq('FileUploader')
-
-      expect(new_upload_hashed.secret).not_to be_nil
-      expect(new_upload_hashed.path).to end_with("#{new_upload_hashed.secret}/text.pdf")
-      expect(new_upload_hashed.model_id).to eq(hashed_project.id)
-      expect(new_upload_hashed.model_type).to eq('Project')
-      expect(new_upload_hashed.uploader).to eq('FileUploader')
-    end
-
-    it 'updates the legacy upload notes so that they include the file references in the markdown' do
-      expected_path = File.join('/uploads', new_upload_legacy.secret, 'image.png')
-      expected_markdown = "some note text awesome \n ![image](#{expected_path})"
-      expect(note1.reload.note).to eq(expected_markdown)
-
-      expected_path = File.join('/uploads', new_upload_hashed.secret, 'text.pdf')
-      expected_markdown = "some note \n [text.pdf](#{expected_path})"
-      expect(note_hashed_project.reload.note).to eq(expected_markdown)
-    end
-
-    it 'removed the attachments from the note model' do
-      expect(note1.reload.attachment.file).to be_nil
-      expect(note2.reload.attachment.file).to be_nil
-      expect(note_hashed_project.reload.attachment.file).to be_nil
-    end
-  end
-
-  context 'when legacy uploads are stored in local storage' do
-    let!(:legacy_upload1) { create_upload(note1, 'image.png') }
-    let!(:legacy_upload_not_found) { create_upload(note2, 'image.png', false) }
-    let!(:legacy_upload_hashed) { create_upload(note_hashed_project, 'text.pdf', with_file: true) }
-
-    shared_examples 'removes legacy local files' do
-      it 'removes all the legacy upload records' do
-        expect(File.exist?(legacy_upload1.absolute_path)).to be_truthy
-        expect(File.exist?(legacy_upload_hashed.absolute_path)).to be_truthy
-
-        described_class.new.perform(start_id, end_id)
-
-        expect(File.exist?(legacy_upload1.absolute_path)).to be_falsey
-        expect(File.exist?(legacy_upload_hashed.absolute_path)).to be_falsey
-      end
-    end
-
-    context 'when object storage is disabled for FileUploader' do
-      it_behaves_like 'migrates files correctly'
-      it_behaves_like 'removes legacy local files'
-
-      it 'moves legacy uploads to the correct location' do
-        described_class.new.perform(start_id, end_id)
-
-        expected_path1 = File.join(test_dir, 'uploads', namespace.path, project.path, new_upload_legacy.secret, 'image.png')
-        expected_path2 = File.join(test_dir, 'uploads', hashed_project.disk_path, new_upload_hashed.secret, 'text.pdf')
-
-        expect(File.exist?(expected_path1)).to be_truthy
-        expect(File.exist?(expected_path2)).to be_truthy
-      end
-
-      context 'when the upload move fails' do
-        it 'does not remove old uploads' do
-          expect(FileUploader).to receive(:copy_to).twice.and_raise('failed')
-
-          described_class.new.perform(start_id, end_id)
-
-          expect(legacy_upload1.reload).to eq(legacy_upload1)
-          expect(legacy_upload_hashed.reload).to eq(legacy_upload_hashed)
-          expect(standard_upload.reload).to eq(standard_upload)
-        end
-      end
-    end
-
-    context 'when object storage is enabled for FileUploader' do
-      before do
-        stub_uploads_object_storage(FileUploader)
-      end
-
-      it_behaves_like 'migrates files correctly'
-      it_behaves_like 'removes legacy local files'
-
-      # The process of migrating to object storage is a manual one,
-      # so it would go against expectations to automatically migrate these files
-      # to object storage during this migration.
-      # After this migration, these files should be able to successfully migrate to object storage.
-      it 'stores files locally' do
-        described_class.new.perform(start_id, end_id)
-
-        expected_path1 = File.join(test_dir, 'uploads', namespace.path, project.path, new_upload_legacy.secret, 'image.png')
-        expected_path2 = File.join(test_dir, 'uploads', hashed_project.disk_path, new_upload_hashed.secret, 'text.pdf')
-
-        expect(File.exist?(expected_path1)).to be_truthy
-        expect(File.exist?(expected_path2)).to be_truthy
-      end
-    end
-
-    context 'with legacy_diff_note upload' do
-      let!(:merge_request) { create(:merge_request, source_project: project) }
-      let!(:legacy_diff_note) { create(:legacy_diff_note_on_merge_request, note: 'some note', project: project, noteable: merge_request) }
-      let!(:legacy_upload_diff_note) do
-        create(:upload, :with_file, :attachment_upload,
-               path: "uploads/-/system/note/attachment/#{legacy_diff_note.id}/some_legacy.pdf", model: legacy_diff_note)
-      end
-
-      before do
-        described_class.new.perform(start_id, end_id)
-      end
-
-      it 'does not remove legacy diff note file' do
-        expect(File.exist?(legacy_upload_diff_note.absolute_path)).to be_truthy
-      end
-
-      it 'removes all the legacy upload records except for the one with legacy_diff_note' do
-        expect(Upload.where(uploader: 'AttachmentUploader')).to eq([legacy_upload_diff_note])
-      end
-
-      it 'adds link to the troubleshooting documentation to the note' do
-        help_doc_link = 'https://docs.gitlab.com/ee/administration/troubleshooting/migrations.html#legacy-upload-migration'
-
-        expect(legacy_diff_note.reload.note).to include(help_doc_link)
-      end
-    end
-  end
-
-  context 'when legacy uploads are stored in object storage' do
-    let!(:legacy_upload1) { create_remote_upload(note1, 'image.png') }
-    let!(:legacy_upload_not_found) { create_remote_upload(note2, 'non-existing.pdf') }
-    let!(:legacy_upload_hashed) { create_remote_upload(note_hashed_project, 'text.pdf') }
-    let(:remote_files) do
-      [
-        { key: "#{legacy_upload1.path}" },
-        { key: "#{legacy_upload_hashed.path}" }
-      ]
-    end
-    let(:connection) { ::Fog::Storage.new(FileUploader.object_store_credentials) }
-    let(:bucket) { connection.directories.create(key: 'uploads') }
-
-    def create_remote_files
-      remote_files.each { |file| bucket.files.create(file) }
-    end
-
-    before do
-      stub_uploads_object_storage(FileUploader)
-      create_remote_files
-    end
-
-    it_behaves_like 'migrates files correctly'
-
-    it 'moves legacy uploads to the correct remote location' do
-      described_class.new.perform(start_id, end_id)
-
-      connection = ::Fog::Storage.new(FileUploader.object_store_credentials)
-      expect(connection.get_object('uploads', new_upload_legacy.path)[:status]).to eq(200)
-      expect(connection.get_object('uploads', new_upload_hashed.path)[:status]).to eq(200)
-    end
-
-    it 'removes all the legacy upload records' do
-      described_class.new.perform(start_id, end_id)
-
-      remote_files.each do |remote_file|
-        expect(bucket.files.get(remote_file[:key])).to be_nil
-      end
-    end
-  end
-  # rubocop: enable RSpec/FactoriesInMigrationSpecs
-end