Merge branch '53966-make-hashed-storage-migration-safer-and-more-inviting' into 'master'

Hashed Storage rollback mechanism

See merge request gitlab-org/gitlab-ce!23955

10 files changed, 510 insertions, 21 deletions

diff --git a/spec/lib/gitlab/hashed_storage/migrator_spec.rb b/spec/lib/gitlab/hashed_storage/migrator_spec.rb
index 3942f168ceb..6154b3e2f76 100644
--- a/spec/lib/gitlab/hashed_storage/migrator_spec.rb
+++ b/spec/lib/gitlab/hashed_storage/migrator_spec.rb
@@ -1,21 +1,29 @@
 require 'spec_helper'
 
 describe Gitlab::HashedStorage::Migrator do
-  describe '#bulk_schedule' do
-    it 'schedules job to StorageMigratorWorker' do
+  describe '#bulk_schedule_migration' do
+    it 'schedules job to HashedStorage::MigratorWorker' do
       Sidekiq::Testing.fake! do
-        expect { subject.bulk_schedule(start: 1, finish: 5) }.to change(HashedStorage::MigratorWorker.jobs, :size).by(1)
+        expect { subject.bulk_schedule_migration(start: 1, finish: 5) }.to change(HashedStorage::MigratorWorker.jobs, :size).by(1)
+      end
+    end
+  end
+
+  describe '#bulk_schedule_rollback' do
+    it 'schedules job to HashedStorage::RollbackerWorker' do
+      Sidekiq::Testing.fake! do
+        expect { subject.bulk_schedule_rollback(start: 1, finish: 5) }.to change(HashedStorage::RollbackerWorker.jobs, :size).by(1)
       end
     end
   end
 
   describe '#bulk_migrate' do
-    let(:projects) { create_list(:project, 2, :legacy_storage) }
+    let(:projects) { create_list(:project, 2, :legacy_storage, :empty_repo) }
     let(:ids) { projects.map(&:id) }
 
-    it 'enqueue jobs to ProjectMigrateHashedStorageWorker' do
+    it 'enqueue jobs to HashedStorage::ProjectMigrateWorker' do
       Sidekiq::Testing.fake! do
-        expect { subject.bulk_migrate(start: ids.min, finish: ids.max) }.to change(ProjectMigrateHashedStorageWorker.jobs, :size).by(2)
+        expect { subject.bulk_migrate(start: ids.min, finish: ids.max) }.to change(HashedStorage::ProjectMigrateWorker.jobs, :size).by(2)
       end
     end
 
@@ -32,13 +40,53 @@ describe Gitlab::HashedStorage::Migrator do
       subject.bulk_migrate(start: ids.min, finish: ids.max)
     end
 
-    it 'has migrated projects set as writable' do
+    it 'has all projects migrated and set as writable' do
       perform_enqueued_jobs do
         subject.bulk_migrate(start: ids.min, finish: ids.max)
       end
 
       projects.each do |project|
-        expect(project.reload.repository_read_only?).to be_falsey
+        project.reload
+
+        expect(project.hashed_storage?(:repository)).to be_truthy
+        expect(project.repository_read_only?).to be_falsey
+      end
+    end
+  end
+
+  describe '#bulk_rollback' do
+    let(:projects) { create_list(:project, 2, :empty_repo) }
+    let(:ids) { projects.map(&:id) }
+
+    it 'enqueue jobs to HashedStorage::ProjectRollbackWorker' do
+      Sidekiq::Testing.fake! do
+        expect { subject.bulk_rollback(start: ids.min, finish: ids.max) }.to change(HashedStorage::ProjectRollbackWorker.jobs, :size).by(2)
+      end
+    end
+
+    it 'rescues and log exceptions' do
+      allow_any_instance_of(Project).to receive(:rollback_to_legacy_storage!).and_raise(StandardError)
+      expect { subject.bulk_rollback(start: ids.min, finish: ids.max) }.not_to raise_error
+    end
+
+    it 'delegates each project in specified range to #rollback' do
+      projects.each do |project|
+        expect(subject).to receive(:rollback).with(project)
+      end
+
+      subject.bulk_rollback(start: ids.min, finish: ids.max)
+    end
+
+    it 'has all projects rolledback and set as writable' do
+      perform_enqueued_jobs do
+        subject.bulk_rollback(start: ids.min, finish: ids.max)
+      end
+
+      projects.each do |project|
+        project.reload
+
+        expect(project.legacy_storage?).to be_truthy
+        expect(project.repository_read_only?).to be_falsey
       end
     end
   end
@@ -48,7 +96,7 @@ describe Gitlab::HashedStorage::Migrator do
 
     it 'enqueues project migration job' do
       Sidekiq::Testing.fake! do
-        expect { subject.migrate(project) }.to change(ProjectMigrateHashedStorageWorker.jobs, :size).by(1)
+        expect { subject.migrate(project) }.to change(HashedStorage::ProjectMigrateWorker.jobs, :size).by(1)
       end
     end
 
@@ -79,7 +127,7 @@ describe Gitlab::HashedStorage::Migrator do
 
       it 'doesnt enqueue any migration job' do
         Sidekiq::Testing.fake! do
-          expect { subject.migrate(project) }.not_to change(ProjectMigrateHashedStorageWorker.jobs, :size)
+          expect { subject.migrate(project) }.not_to change(HashedStorage::ProjectMigrateWorker.jobs, :size)
         end
       end
 
@@ -88,4 +136,50 @@ describe Gitlab::HashedStorage::Migrator do
       end
     end
   end
+
+  describe '#rollback' do
+    let(:project) { create(:project, :empty_repo) }
+
+    it 'enqueues project rollback job' do
+      Sidekiq::Testing.fake! do
+        expect { subject.rollback(project) }.to change(HashedStorage::ProjectRollbackWorker.jobs, :size).by(1)
+      end
+    end
+
+    it 'rescues and log exceptions' do
+      allow(project).to receive(:rollback_to_hashed_storage!).and_raise(StandardError)
+
+      expect { subject.rollback(project) }.not_to raise_error
+    end
+
+    it 'rolls-back project storage' do
+      perform_enqueued_jobs do
+        subject.rollback(project)
+      end
+
+      expect(project.reload.legacy_storage?).to be_truthy
+    end
+
+    it 'has rolled-back project set as writable' do
+      perform_enqueued_jobs do
+        subject.rollback(project)
+      end
+
+      expect(project.reload.repository_read_only?).to be_falsey
+    end
+
+    context 'when project is already on legacy storage' do
+      let(:project) { create(:project, :legacy_storage, :empty_repo) }
+
+      it 'doesnt enqueue any rollback job' do
+        Sidekiq::Testing.fake! do
+          expect { subject.rollback(project) }.not_to change(HashedStorage::ProjectRollbackWorker.jobs, :size)
+        end
+      end
+
+      it 'returns false' do
+        expect(subject.rollback(project)).to be_falsey
+      end
+    end
+  end
 end
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 9fb0d04ca9e..b2392f9521f 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -3430,28 +3430,42 @@ describe Project do
         project.migrate_to_hashed_storage!
       end
 
-      it 'schedules ProjectMigrateHashedStorageWorker with delayed start when the project repo is in use' do
+      it 'schedules HashedStorage::ProjectMigrateWorker with delayed start when the project repo is in use' do
         Gitlab::ReferenceCounter.new(project.gl_repository(is_wiki: false)).increase
 
-        expect(ProjectMigrateHashedStorageWorker).to receive(:perform_in)
+        expect(HashedStorage::ProjectMigrateWorker).to receive(:perform_in)
 
         project.migrate_to_hashed_storage!
       end
 
-      it 'schedules ProjectMigrateHashedStorageWorker with delayed start when the wiki repo is in use' do
+      it 'schedules HashedStorage::ProjectMigrateWorker with delayed start when the wiki repo is in use' do
         Gitlab::ReferenceCounter.new(project.gl_repository(is_wiki: true)).increase
 
-        expect(ProjectMigrateHashedStorageWorker).to receive(:perform_in)
+        expect(HashedStorage::ProjectMigrateWorker).to receive(:perform_in)
 
         project.migrate_to_hashed_storage!
       end
 
-      it 'schedules ProjectMigrateHashedStorageWorker' do
-        expect(ProjectMigrateHashedStorageWorker).to receive(:perform_async).with(project.id)
+      it 'schedules HashedStorage::ProjectMigrateWorker' do
+        expect(HashedStorage::ProjectMigrateWorker).to receive(:perform_async).with(project.id)
 
         project.migrate_to_hashed_storage!
       end
     end
+
+    describe '#rollback_to_legacy_storage!' do
+      let(:project) { create(:project, :empty_repo, :legacy_storage) }
+
+      it 'returns nil' do
+        expect(project.rollback_to_legacy_storage!).to be_nil
+      end
+
+      it 'does not run validations' do
+        expect(project).not_to receive(:valid?)
+
+        project.rollback_to_legacy_storage!
+      end
+    end
   end
 
   context 'hashed storage' do
@@ -3527,11 +3541,35 @@ describe Project do
           project = create(:project, storage_version: 1, skip_disk_validation: true)
 
           Sidekiq::Testing.fake! do
-            expect { project.migrate_to_hashed_storage! }.to change(ProjectMigrateHashedStorageWorker.jobs, :size).by(1)
+            expect { project.migrate_to_hashed_storage! }.to change(HashedStorage::ProjectMigrateWorker.jobs, :size).by(1)
           end
         end
       end
     end
+
+    describe '#rollback_to_legacy_storage!' do
+      let(:project) { create(:project, :repository, skip_disk_validation: true) }
+
+      it 'returns true' do
+        expect(project.rollback_to_legacy_storage!).to be_truthy
+      end
+
+      it 'does not run validations' do
+        expect(project).not_to receive(:valid?)
+
+        project.rollback_to_legacy_storage!
+      end
+
+      it 'does not flag as read-only' do
+        expect { project.rollback_to_legacy_storage! }.not_to change { project.repository_read_only }
+      end
+
+      it 'enqueues a job' do
+        Sidekiq::Testing.fake! do
+          expect { project.rollback_to_legacy_storage! }.to change(HashedStorage::ProjectRollbackWorker.jobs, :size).by(1)
+        end
+      end
+    end
   end
 
   describe '#gl_repository' do
diff --git a/spec/services/projects/hashed_storage/migrate_attachments_service_spec.rb b/spec/services/projects/hashed_storage/migrate_attachments_service_spec.rb
index 61dbb57ec08..639dd930618 100644
--- a/spec/services/projects/hashed_storage/migrate_attachments_service_spec.rb
+++ b/spec/services/projects/hashed_storage/migrate_attachments_service_spec.rb
@@ -70,10 +70,10 @@ describe Projects::HashedStorage::MigrateAttachmentsService do
         FileUtils.mkdir_p(base_path(hashed_storage))
       end
 
-      it 'raises AttachmentMigrationError' do
+      it 'raises AttachmentCannotMoveError' do
         expect(FileUtils).not_to receive(:mv).with(base_path(legacy_storage), base_path(hashed_storage))
 
-        expect { service.execute }.to raise_error(Projects::HashedStorage::AttachmentMigrationError)
+        expect { service.execute }.to raise_error(Projects::HashedStorage::AttachmentCannotMoveError)
       end
     end
   end
@@ -86,6 +86,8 @@ describe Projects::HashedStorage::MigrateAttachmentsService do
 
   context '#new_disk_path' do
     it 'returns new disk_path for project' do
+      service.execute
+
       expect(service.new_disk_path).to eq(project.disk_path)
     end
   end
diff --git a/spec/services/projects/hashed_storage/migrate_repository_service_spec.rb b/spec/services/projects/hashed_storage/migrate_repository_service_spec.rb
index 0772dc4b85b..e77e2198439 100644
--- a/spec/services/projects/hashed_storage/migrate_repository_service_spec.rb
+++ b/spec/services/projects/hashed_storage/migrate_repository_service_spec.rb
@@ -28,7 +28,17 @@ describe Projects::HashedStorage::MigrateRepositoryService do
       it 'fails when a git operation is in progress' do
         allow(project).to receive(:repo_reference_count) { 1 }
 
-        expect { service.execute }.to raise_error(Projects::HashedStorage::RepositoryMigrationError)
+        expect { service.execute }.to raise_error(Projects::HashedStorage::RepositoryInUseError)
+      end
+    end
+
+    context 'when repository doesnt exist on disk' do
+      let(:project) { create(:project, :legacy_storage) }
+
+      it 'skips the disk change but increase the version' do
+        service.execute
+
+        expect(project.hashed_storage?(:repository)).to be_truthy
       end
     end
 
diff --git a/spec/services/projects/hashed_storage/rollback_attachments_service_spec.rb b/spec/services/projects/hashed_storage/rollback_attachments_service_spec.rb
new file mode 100644
index 00000000000..6f4154d6011
--- /dev/null
+++ b/spec/services/projects/hashed_storage/rollback_attachments_service_spec.rb
@@ -0,0 +1,100 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::HashedStorage::RollbackAttachmentsService do
+  subject(:service) { described_class.new(project, logger: nil) }
+
+  let(:project) { create(:project, :repository, skip_disk_validation: true) }
+  let(:legacy_storage) { Storage::LegacyProject.new(project) }
+  let(:hashed_storage) { Storage::HashedProject.new(project) }
+
+  let!(:upload) { Upload.find_by(path: file_uploader.upload_path) }
+  let(:file_uploader) { build(:file_uploader, project: project) }
+  let(:old_disk_path) { File.join(base_path(hashed_storage), upload.path) }
+  let(:new_disk_path) { File.join(base_path(legacy_storage), upload.path) }
+
+  context '#execute' do
+    context 'when succeeds' do
+      it 'moves attachments to legacy storage layout' do
+        expect(File.file?(old_disk_path)).to be_truthy
+        expect(File.file?(new_disk_path)).to be_falsey
+        expect(File.exist?(base_path(hashed_storage))).to be_truthy
+        expect(File.exist?(base_path(legacy_storage))).to be_falsey
+        expect(FileUtils).to receive(:mv).with(base_path(hashed_storage), base_path(legacy_storage)).and_call_original
+
+        service.execute
+
+        expect(File.exist?(base_path(legacy_storage))).to be_truthy
+        expect(File.exist?(base_path(hashed_storage))).to be_falsey
+        expect(File.file?(old_disk_path)).to be_falsey
+        expect(File.file?(new_disk_path)).to be_truthy
+      end
+
+      it 'returns true' do
+        expect(service.execute).to be_truthy
+      end
+
+      it 'sets skipped to false' do
+        service.execute
+
+        expect(service.skipped?).to be_falsey
+      end
+    end
+
+    context 'when original folder does not exist anymore' do
+      before do
+        FileUtils.rm_rf(base_path(hashed_storage))
+      end
+
+      it 'skips moving folders and go to next' do
+        expect(FileUtils).not_to receive(:mv).with(base_path(hashed_storage), base_path(legacy_storage))
+
+        service.execute
+
+        expect(File.exist?(base_path(legacy_storage))).to be_falsey
+        expect(File.file?(new_disk_path)).to be_falsey
+      end
+
+      it 'returns true' do
+        expect(service.execute).to be_truthy
+      end
+
+      it 'sets skipped to true' do
+        service.execute
+
+        expect(service.skipped?).to be_truthy
+      end
+    end
+
+    context 'when target folder already exists' do
+      before do
+        FileUtils.mkdir_p(base_path(legacy_storage))
+      end
+
+      it 'raises AttachmentCannotMoveError' do
+        expect(FileUtils).not_to receive(:mv).with(base_path(legacy_storage), base_path(hashed_storage))
+
+        expect { service.execute }.to raise_error(Projects::HashedStorage::AttachmentCannotMoveError)
+      end
+    end
+  end
+
+  context '#old_disk_path' do
+    it 'returns old disk_path for project' do
+      expect(service.old_disk_path).to eq(project.disk_path)
+    end
+  end
+
+  context '#new_disk_path' do
+    it 'returns new disk_path for project' do
+      service.execute
+
+      expect(service.new_disk_path).to eq(project.full_path)
+    end
+  end
+
+  def base_path(storage)
+    File.join(FileUploader.root, storage.disk_path)
+  end
+end
diff --git a/spec/services/projects/hashed_storage/rollback_repository_service_spec.rb b/spec/services/projects/hashed_storage/rollback_repository_service_spec.rb
new file mode 100644
index 00000000000..41927934501
--- /dev/null
+++ b/spec/services/projects/hashed_storage/rollback_repository_service_spec.rb
@@ -0,0 +1,111 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::HashedStorage::RollbackRepositoryService, :clean_gitlab_redis_shared_state do
+  include GitHelpers
+
+  let(:gitlab_shell) { Gitlab::Shell.new }
+  let(:project) { create(:project, :repository, :wiki_repo, storage_version: ::Project::HASHED_STORAGE_FEATURES[:repository]) }
+  let(:legacy_storage) { Storage::LegacyProject.new(project) }
+  let(:hashed_storage) { Storage::HashedProject.new(project) }
+
+  subject(:service) { described_class.new(project, project.disk_path) }
+
+  describe '#execute' do
+    let(:old_disk_path) { hashed_storage.disk_path }
+    let(:new_disk_path) { legacy_storage.disk_path }
+
+    before do
+      allow(service).to receive(:gitlab_shell) { gitlab_shell }
+    end
+
+    context 'repository lock' do
+      it 'tries to lock the repository' do
+        expect(service).to receive(:try_to_set_repository_read_only!)
+
+        service.execute
+      end
+
+      it 'fails when a git operation is in progress' do
+        allow(project).to receive(:repo_reference_count) { 1 }
+
+        expect { service.execute }.to raise_error(Projects::HashedStorage::RepositoryInUseError)
+      end
+    end
+
+    context 'when repository doesnt exist on disk' do
+      let(:project) { create(:project) }
+
+      it 'skips the disk change but decrease the version' do
+        service.execute
+
+        expect(project.legacy_storage?).to be_truthy
+      end
+    end
+
+    context 'when succeeds' do
+      it 'renames project and wiki repositories' do
+        service.execute
+
+        expect(gitlab_shell.exists?(project.repository_storage, "#{new_disk_path}.git")).to be_truthy
+        expect(gitlab_shell.exists?(project.repository_storage, "#{new_disk_path}.wiki.git")).to be_truthy
+      end
+
+      it 'updates project to be legacy and not read-only' do
+        service.execute
+
+        expect(project.legacy_storage?).to be_truthy
+        expect(project.repository_read_only).to be_falsey
+      end
+
+      it 'move operation is called for both repositories' do
+        expect_move_repository(old_disk_path, new_disk_path)
+        expect_move_repository("#{old_disk_path}.wiki", "#{new_disk_path}.wiki")
+
+        service.execute
+      end
+
+      it 'writes project full path to .git/config' do
+        service.execute
+
+        rugged_config = rugged_repo(project.repository).config['gitlab.fullpath']
+
+        expect(rugged_config).to eq project.full_path
+      end
+    end
+
+    context 'when one move fails' do
+      it 'rolls repositories back to original name' do
+        allow(service).to receive(:move_repository).and_call_original
+        allow(service).to receive(:move_repository).with(old_disk_path, new_disk_path).once { false } # will disable first move only
+
+        expect(service).to receive(:rollback_folder_move).and_call_original
+
+        service.execute
+
+        expect(gitlab_shell.exists?(project.repository_storage, "#{new_disk_path}.git")).to be_falsey
+        expect(gitlab_shell.exists?(project.repository_storage, "#{new_disk_path}.wiki.git")).to be_falsey
+        expect(project.repository_read_only?).to be_falsey
+      end
+
+      context 'when rollback fails' do
+        before do
+          legacy_storage.ensure_storage_path_exists
+          gitlab_shell.mv_repository(project.repository_storage, old_disk_path, new_disk_path)
+        end
+
+        it 'does not try to move nil repository over existing' do
+          expect(gitlab_shell).not_to receive(:mv_repository).with(project.repository_storage, old_disk_path, new_disk_path)
+          expect_move_repository("#{old_disk_path}.wiki", "#{new_disk_path}.wiki")
+
+          service.execute
+        end
+      end
+    end
+
+    def expect_move_repository(from_name, to_name)
+      expect(gitlab_shell).to receive(:mv_repository).with(project.repository_storage, from_name, to_name).and_call_original
+    end
+  end
+end
diff --git a/spec/services/projects/hashed_storage/rollback_service_spec.rb b/spec/services/projects/hashed_storage/rollback_service_spec.rb
new file mode 100644
index 00000000000..427d1535559
--- /dev/null
+++ b/spec/services/projects/hashed_storage/rollback_service_spec.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::HashedStorage::RollbackService do
+  let(:project) { create(:project, :empty_repo, :wiki_repo) }
+  let(:logger) { double }
+
+  subject(:service) { described_class.new(project, project.full_path, logger: logger) }
+
+  describe '#execute' do
+    context 'attachments rollback' do
+      let(:attachments_service_class) { Projects::HashedStorage::RollbackAttachmentsService }
+      let(:attachments_service) { attachments_service_class.new(project, logger: logger) }
+
+      it 'delegates rollback to Projects::HashedStorage::RollbackAttachmentsService' do
+        expect(attachments_service_class).to receive(:new)
+            .with(project, logger: logger)
+            .and_return(attachments_service)
+        expect(attachments_service).to receive(:execute)
+
+        service.execute
+      end
+
+      it 'does not delegate rollback if repository is in legacy storage already' do
+        project.storage_version = nil
+        expect(attachments_service_class).not_to receive(:new)
+
+        service.execute
+      end
+    end
+
+    context 'repository rollback' do
+      let(:repository_service_class) { Projects::HashedStorage::RollbackRepositoryService }
+      let(:repository_service) { repository_service_class.new(project, project.full_path, logger: logger) }
+
+      it 'delegates rollback to RollbackRepositoryService' do
+        project.storage_version = ::Project::HASHED_STORAGE_FEATURES[:repository]
+
+        expect(repository_service_class).to receive(:new)
+            .with(project, project.full_path, logger: logger)
+            .and_return(repository_service)
+        expect(repository_service).to receive(:execute)
+
+        service.execute
+      end
+
+      it 'does not delegate rollback if repository is in legacy storage already' do
+        project.storage_version = nil
+
+        expect(repository_service_class).not_to receive(:new)
+
+        service.execute
+      end
+    end
+  end
+end
diff --git a/spec/workers/project_migrate_hashed_storage_worker_spec.rb b/spec/workers/hashed_storage/project_migrate_worker_spec.rb
index 333eb6a0569..340e722aa7e 100644
--- a/spec/workers/project_migrate_hashed_storage_worker_spec.rb
+++ b/spec/workers/hashed_storage/project_migrate_worker_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe ProjectMigrateHashedStorageWorker, :clean_gitlab_redis_shared_state do
+describe HashedStorage::ProjectMigrateWorker, :clean_gitlab_redis_shared_state do
   include ExclusiveLeaseHelpers
 
   describe '#perform' do
diff --git a/spec/workers/hashed_storage/project_rollback_worker_spec.rb b/spec/workers/hashed_storage/project_rollback_worker_spec.rb
new file mode 100644
index 00000000000..d833553c0ec
--- /dev/null
+++ b/spec/workers/hashed_storage/project_rollback_worker_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe HashedStorage::ProjectRollbackWorker, :clean_gitlab_redis_shared_state do
+  include ExclusiveLeaseHelpers
+
+  describe '#perform' do
+    let(:project) { create(:project, :empty_repo) }
+    let(:lease_key) { "project_migrate_hashed_storage_worker:#{project.id}" }
+    let(:lease_timeout) { described_class::LEASE_TIMEOUT }
+    let(:rollback_service) { ::Projects::HashedStorage::RollbackService }
+
+    it 'skips when project no longer exists' do
+      expect(rollback_service).not_to receive(:new)
+
+      subject.perform(-1)
+    end
+
+    it 'skips when project is pending delete' do
+      pending_delete_project = create(:project, :empty_repo, pending_delete: true)
+
+      expect(rollback_service).not_to receive(:new)
+
+      subject.perform(pending_delete_project.id)
+    end
+
+    it 'delegates rollback to service class when have exclusive lease' do
+      stub_exclusive_lease(lease_key, 'uuid', timeout: lease_timeout)
+
+      service_spy = spy
+
+      allow(rollback_service)
+        .to receive(:new).with(project, project.disk_path, logger: subject.logger)
+        .and_return(service_spy)
+
+      subject.perform(project.id)
+
+      expect(service_spy).to have_received(:execute)
+    end
+
+    it 'skips when it cant acquire the exclusive lease' do
+      stub_exclusive_lease_taken(lease_key, timeout: lease_timeout)
+
+      expect(rollback_service).not_to receive(:new)
+
+      subject.perform(project.id)
+    end
+  end
+end
diff --git a/spec/workers/hashed_storage/rollbacker_worker_spec.rb b/spec/workers/hashed_storage/rollbacker_worker_spec.rb
new file mode 100644
index 00000000000..4055f380978
--- /dev/null
+++ b/spec/workers/hashed_storage/rollbacker_worker_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe HashedStorage::RollbackerWorker do
+  subject(:worker) { described_class.new }
+  let(:projects) { create_list(:project, 2, :empty_repo) }
+  let(:ids) { projects.map(&:id) }
+
+  describe '#perform' do
+    it 'delegates to MigratorService' do
+      expect_any_instance_of(Gitlab::HashedStorage::Migrator).to receive(:bulk_rollback).with(start: 5, finish: 10)
+
+      worker.perform(5, 10)
+    end
+
+    it 'rollsback projects in the specified range' do
+      perform_enqueued_jobs do
+        worker.perform(ids.min, ids.max)
+      end
+
+      projects.each do |project|
+        expect(project.reload.legacy_storage?).to be_truthy
+      end
+    end
+  end
+end