Add UUID Storage to Project

app/models/concerns/storage/uuid_project.rb

+module Storage
+  module UUIDProject
+    extend ActiveSupport::Concern
+
+    def uuid_dir
+      %Q(#{uuid[0..1]}/#{uuid[2..3]})
+    end
+
+    def disk_path
+      %Q(#{uuid_dir}/#{uuid})
+    end
+
+    def ensure_storage_path_exist
+      gitlab_shell.add_namespace(repository_storage_path, uuid_dir)
+    end
+
+    def rename_repo
+      # TODO: We cannot wipe most of this method until we provide migration path for Container Registries
+      path_was = previous_changes['path'].first
+      old_path_with_namespace = File.join(namespace.full_path, path_was)
+      new_path_with_namespace = File.join(namespace.full_path, path)
+
+      Rails.logger.error "Attempting to rename #{old_path_with_namespace} -> #{new_path_with_namespace}"
+
+      if has_container_registry_tags?
+        Rails.logger.error "Project #{old_path_with_namespace} cannot be renamed because container registry tags are present!"
+
+        # we currently doesn't support renaming repository if it contains images in container registry
+        raise StandardError.new('Project cannot be renamed, because images are present in its container registry')
+      end
+
+      begin
+        # TODO: we can avoid cache expiration if cache is based on UUID or just project_id
+        expire_caches_before_rename(old_path_with_namespace)
+        expires_full_path_cache
+
+        send_move_instructions(old_path_with_namespace)
+
+        @old_path_with_namespace = old_path_with_namespace
+
+        SystemHooksService.new.execute_hooks_for(self, :rename)
+
+        @repository = nil
+      rescue => e
+        Rails.logger.error "Exception renaming #{old_path_with_namespace} -> #{new_path_with_namespace}: #{e}"
+        # Returning false does not rollback after_* transaction but gives
+        # us information about failing some of tasks
+        false
+      end
+
+      Gitlab::AppLogger.info "Project was renamed: #{old_path_with_namespace} -> #{new_path_with_namespace}"
+
+      # TODO: When we move Uploads and Pages to use UUID we can disable this transfers as well
+      Gitlab::UploadsTransfer.new.rename_project(path_was, path, namespace.full_path)
+      Gitlab::PagesTransfer.new.rename_project(path_was, path, namespace.full_path)
+    end
+  end
+end

app/models/project.rb

@@ -17,7 +17,6 @@ class Project < ActiveRecord::Base
   include ProjectFeaturesCompatibility
   include SelectForProjectAuthorization
   include Routable
-  include Storage::LegacyProject
 
   extend Gitlab::ConfigHelper
 
@@ -1424,6 +1423,14 @@ class Project < ActiveRecord::Base
 
   private
 
+  def load_storage
+    if self.storage_version > 1
+      self.class.include Storage::UUIDProject
+    else
+      self.class.include Storage::LegacyProject
+    end
+  end
+
   # set last_activity_at to the same as created_at
   def set_last_activity_at
     update_column(:last_activity_at, self.created_at)

db/migrate/20170802013652_add_storage_fields_to_project.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddStorageFieldsToProject < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index", "remove_concurrent_index" or
+  # "add_column_with_default" you must disable the use of transactions
+  # as these methods can not run in an existing transaction.
+  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
+  # that either of them is the _only_ method called in the migration,
+  # any other changes should go in a separate migration.
+  # This ensures that upon failure _only_ the index creation or removing fails
+  # and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  def up
+    # rubocop:disable Migration/AddColumnWithDefaultToLargeTable
+    add_column :projects, :uuid, :uuid
+    add_column_with_default :projects, :storage_version, :integer, default: 0, limit: 1
+    add_concurrent_index :projects, :uuid
+  end
+
+  def down
+    remove_column :projects, :uuid
+    remove_column :projects, :storage_version
+  end
+end

db/schema.rb

@@ -1208,6 +1208,8 @@ ActiveRecord::Schema.define(version: 20170820100558) do
     t.datetime "last_repository_updated_at"
     t.string "ci_config_path"
     t.text "delete_error"
+    t.uuid "uuid"
+    t.integer "storage_version", limit: 2, default: 0, null: false
   end
 
   add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree
@@ -1224,6 +1226,7 @@ ActiveRecord::Schema.define(version: 20170820100558) do
   add_index "projects", ["pending_delete"], name: "index_projects_on_pending_delete", using: :btree
   add_index "projects", ["runners_token"], name: "index_projects_on_runners_token", using: :btree
   add_index "projects", ["star_count"], name: "index_projects_on_star_count", using: :btree
+  add_index "projects", ["uuid"], name: "index_projects_on_uuid", using: :btree
   add_index "projects", ["visibility_level"], name: "index_projects_on_visibility_level", using: :btree
 
   create_table "protected_branch_merge_access_levels", force: :cascade do |t|