Use Gitaly's DeleteAllRepositories RPC during backup restore

GITALY_SERVER_VERSION

-0.102.0
+0.103.0

Gemfile

@@ -412,7 +412,7 @@ group :ed25519 do
 end
 
 # Gitaly GRPC client
-gem 'gitaly-proto', '~> 0.99.0', require: 'gitaly'
+gem 'gitaly-proto', '~> 0.100.0', require: 'gitaly'
 gem 'grpc', '~> 1.11.0'
 
 # Locked until https://github.com/google/protobuf/issues/4210 is closed

Gemfile.lock

@@ -281,7 +281,7 @@ GEM
       gettext_i18n_rails (>= 0.7.1)
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
-    gitaly-proto (0.99.0)
+    gitaly-proto (0.100.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.10)
     github-linguist (5.3.3)
@@ -1036,7 +1036,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly-proto (~> 0.99.0)
+  gitaly-proto (~> 0.100.0)
   github-linguist (~> 5.3.3)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-gollum-lib (~> 4.2)

lib/backup/repository.rb

@@ -73,12 +73,24 @@ module Backup
     end
 
     def prepare_directories
-      # TODO: Need to find a way to do this for gitaly
-      # Gitaly discussion issue: https://gitlab.com/gitlab-org/gitaly/issues/1194
-
       Gitlab.config.repositories.storages.each do |name, repository_storage|
+        delete_all_repositories(name, repository_storage)
+      end
+    end
+
+    def delete_all_repositories(name, repository_storage)
+      gitaly_migrate(:delete_all_repositories) do |is_enabled|
+        if is_enabled
+          Gitlab::GitalyClient::StorageService.new(name).delete_all_repositories
+        else
+          local_delete_all_repositories(name, repository_storage)
+        end
+      end
+    end
+
+    def local_delete_all_repositories(name, repository_storage)
       path = repository_storage.legacy_disk_path
-        next unless File.exist?(path)
+      return unless File.exist?(path)
 
       # Move all files in the existing repos directory except . and .. to
       # repositories.old.<timestamp> directory
@@ -94,7 +106,6 @@ module Backup
         resource_busy_error(path)
       end
     end
-    end
 
     def restore_custom_hooks(project)
       # TODO: Need to find a way to do this for gitaly
@@ -113,6 +124,7 @@ module Backup
     def restore
       prepare_directories
       gitlab_shell = Gitlab::Shell.new
+
       Project.find_each(batch_size: 1000) do |project|
         progress.print " * #{project.full_path} ... "
         path_to_project_bundle = path_to_bundle(project)
@@ -121,7 +133,6 @@ module Backup
         restore_repo_success = nil
         if File.exist?(path_to_project_bundle)
           begin
-            gitlab_shell.remove_repository(project.repository_storage, project.disk_path) if project.repository_exists?
             project.repository.create_from_bundle path_to_project_bundle
             restore_repo_success = true
           rescue => e
@@ -146,7 +157,6 @@ module Backup
         if File.exist?(path_to_wiki_bundle)
           progress.print " * #{wiki.full_path} ... "
           begin
-            gitlab_shell.remove_repository(wiki.repository_storage, wiki.disk_path) if wiki.repository_exists?
             wiki.repository.create_from_bundle(path_to_wiki_bundle)
             progress.puts "[DONE]".color(:green)
           rescue => e
@@ -224,5 +234,11 @@ module Backup
     def display_repo_path(project)
       project.hashed_storage?(:repository) ? "#{project.full_path} (#{project.disk_path})" : project.full_path
     end
+
+    def gitaly_migrate(method, status: Gitlab::GitalyClient::MigrationStatus::OPT_IN, &block)
+      Gitlab::GitalyClient.migrate(method, status: status, &block)
+    rescue GRPC::NotFound, GRPC::BadStatus => e
+      raise Error, e
+    end
   end
 end

lib/gitlab/gitaly_client/storage_service.rb

+module Gitlab
+  module GitalyClient
+    class StorageService
+      def initialize(storage)
+        @storage = storage
+      end
+
+      # Delete all repositories in the storage. This is a slow and VERY DESTRUCTIVE operation.
+      def delete_all_repositories
+        request = Gitaly::DeleteAllRepositoriesRequest.new(storage_name: @storage)
+        GitalyClient.call(@storage, :storage_service, :delete_all_repositories, request)
+      end
+    end
+  end
+end

spec/lib/backup/repository_spec.rb

@@ -71,6 +71,40 @@ describe Backup::Repository do
     end
   end
 
+  describe '#delete_all_repositories', :seed_helper do
+    shared_examples('delete_all_repositories') do
+      before do
+        allow(FileUtils).to receive(:mkdir_p).and_call_original
+        allow(FileUtils).to receive(:mv).and_call_original
+      end
+
+      after(:all) do
+        ensure_seeds
+      end
+
+      it 'removes all repositories' do
+        # Sanity check: there should be something for us to delete
+        expect(list_repositories).to include(File.join(SEED_STORAGE_PATH, TEST_REPO_PATH))
+
+        subject.delete_all_repositories('default', Gitlab.config.repositories.storages['default'])
+
+        expect(list_repositories).to be_empty
+      end
+
+      def list_repositories
+        Dir[SEED_STORAGE_PATH + '/*.git']
+      end
+    end
+
+    context 'with gitaly' do
+      it_behaves_like 'delete_all_repositories'
+    end
+
+    context 'without gitaly', :skip_gitaly_mock do
+      it_behaves_like 'delete_all_repositories'
+    end
+  end
+
   describe '#empty_repo?' do
     context 'for a wiki' do
       let(:wiki) { create(:project_wiki) }