1 files changed, 69 insertions, 0 deletions
diff --git a/app/services/projects/overwrite_project_service.rb b/app/services/projects/overwrite_project_service.rb
new file mode 100644
index 00000000000..ce94f147aa9
--- /dev/null
+++ b/app/services/projects/overwrite_project_service.rb
@@ -0,0 +1,69 @@
+module Projects
+  class OverwriteProjectService < BaseService
+    def execute(source_project)
+      return unless source_project && source_project.namespace == @project.namespace
+
+      Project.transaction do
+        move_before_destroy_relationships(source_project)
+        destroy_old_project(source_project)
+        rename_project(source_project.name, source_project.path)
+
+        @project
+      end
+    # Projects::DestroyService can raise Exceptions, but we don't want
+    # to pass that kind of exception to the caller. Instead, we change it
+    # for a StandardError exception
+    rescue Exception => e # rubocop:disable Lint/RescueException
+      attempt_restore_repositories(source_project)
+
+      if e.class == Exception
+        raise StandardError, e.message
+      else
+        raise
+      end
+    end
+
+    private
+
+    def move_before_destroy_relationships(source_project)
+      options = { remove_remaining_elements: false }
+
+      ::Projects::MoveUsersStarProjectsService.new(@project, @current_user).execute(source_project, options)
+      ::Projects::MoveAccessService.new(@project, @current_user).execute(source_project, options)
+      ::Projects::MoveDeployKeysProjectsService.new(@project, @current_user).execute(source_project, options)
+      ::Projects::MoveNotificationSettingsService.new(@project, @current_user).execute(source_project, options)
+      ::Projects::MoveForksService.new(@project, @current_user).execute(source_project, options)
+      ::Projects::MoveLfsObjectsProjectsService.new(@project, @current_user).execute(source_project, options)
+      add_source_project_to_fork_network(source_project)
+    end
+
+    def destroy_old_project(source_project)
+      # Delete previous project (synchronously) and unlink relations
+      ::Projects::DestroyService.new(source_project, @current_user).execute
+    end
+
+    def rename_project(name, path)
+      # Update de project's name and path to the original name/path
+      ::Projects::UpdateService.new(@project,
+                                    @current_user,
+                                    { name: name, path: path })
+                               .execute
+    end
+
+    def attempt_restore_repositories(project)
+      ::Projects::DestroyService.new(project, @current_user).attempt_repositories_rollback
+    end
+
+    def add_source_project_to_fork_network(source_project)
+      return unless @project.fork_network
+
+      # Because he have moved all references in the fork network from the source_project
+      # we won't be able to query the database (only through its cached data),
+      # for its former relationships. That's why we're adding it to the network
+      # as a fork of the target project
+      ForkNetworkMember.create!(fork_network: @project.fork_network,
+                                project: source_project,
+                                forked_from_project: @project)
+    end
+  end
+end