Merge branch 'feature/project-export' into 'master'

Export project functionality

This is a MR for the export functionality of https://gitlab.com/gitlab-org/gitlab-ce/issues/3050, which adds the ability to export single projects.

- [x] members
- DB data
  - [x] issues
  - [x] issue comments
  - [x] merge requests
  - [x] merge request diff
  - [x] merge request comments
  - [x] labels
  - [x] milestones
  - [x] snippets
  - [x] releases
  - [x] events
  - [x] commit statuses
  - [x] CI builds
- File system data
  - [x] Git repository
  - [x] wiki
  - [x] uploads
  - [ ] ~~CI build traces~~
  - [ ] ~~CI build artifacts~~
  - [ ] ~~LFS objects~~
- DB configuration
  - [x] services
  - [x] web hooks
  - [x] protected branches
  - [x] deploy keys
  - [x] CI variables
  - [x] CI triggers

See merge request !3114

4 files changed, 87 insertions, 13 deletions

diff --git a/app/services/notification_service.rb b/app/services/notification_service.rb
index f804ac171c4..e70b400829a 100644
--- a/app/services/notification_service.rb
+++ b/app/services/notification_service.rb
@@ -266,6 +266,14 @@ class NotificationService
     end
   end
 
+  def project_exported(project, current_user)
+    mailer.project_was_exported_email(current_user, project).deliver_later
+  end
+
+  def project_not_exported(project, current_user, errors)
+    mailer.project_was_not_exported_email(current_user, project, errors).deliver_later
+  end
+
   protected
 
   # Get project users with WATCH notification level
diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index 61cac5419ad..55956be2844 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -80,16 +80,18 @@ module Projects
     def after_create_actions
       log_info("#{@project.owner.name} created a new project \"#{@project.name_with_namespace}\"")
 
-      @project.create_wiki if @project.wiki_enabled?
+      unless @project.gitlab_project_import?
+        @project.create_wiki if @project.wiki_enabled?
 
-      @project.build_missing_services
+        @project.build_missing_services
 
-      @project.create_labels
+        @project.create_labels
+      end
 
       event_service.create_project(@project, current_user)
       system_hook_service.execute_hooks_for(@project, :create)
 
-      unless @project.group
+      unless @project.group || @project.gitlab_project_import?
         @project.team << [current_user, :master, current_user]
       end
     end
diff --git a/app/services/projects/import_export/export_service.rb b/app/services/projects/import_export/export_service.rb
new file mode 100644
index 00000000000..d6752377ce5
--- /dev/null
+++ b/app/services/projects/import_export/export_service.rb
@@ -0,0 +1,57 @@
+module Projects
+  module ImportExport
+    class ExportService < BaseService
+
+      def execute(_options = {})
+        @shared = Gitlab::ImportExport::Shared.new(relative_path: File.join(project.path_with_namespace, 'work'))
+        save_all
+      end
+
+      private
+
+      def save_all
+        if [version_saver, project_tree_saver, uploads_saver, repo_saver, wiki_repo_saver].all?(&:save)
+          Gitlab::ImportExport::Saver.save(shared: @shared)
+          notify_success
+        else
+          cleanup_and_notify
+        end
+      end
+
+      def version_saver
+        Gitlab::ImportExport::VersionSaver.new(shared: @shared)
+      end
+
+      def project_tree_saver
+        Gitlab::ImportExport::ProjectTreeSaver.new(project: project, shared: @shared)
+      end
+
+      def uploads_saver
+        Gitlab::ImportExport::UploadsSaver.new(project: project, shared: @shared)
+      end
+
+      def repo_saver
+        Gitlab::ImportExport::RepoSaver.new(project: project, shared: @shared)
+      end
+
+      def wiki_repo_saver
+        Gitlab::ImportExport::WikiRepoSaver.new(project: project, shared: @shared)
+      end
+
+      def cleanup_and_notify
+        FileUtils.rm_rf(@shared.export_path)
+
+        notify_error
+        raise Gitlab::ImportExport::Error.new(@shared.errors.join(', '))
+      end
+
+      def notify_success
+        notification_service.project_exported(@project, @current_user)
+      end
+
+      def notify_error
+        notification_service.project_not_exported(@project, @current_user, @shared.errors.join(', '))
+      end
+    end
+  end
+end
diff --git a/app/services/projects/import_service.rb b/app/services/projects/import_service.rb
index c4838d31f2f..9159ec08959 100644
--- a/app/services/projects/import_service.rb
+++ b/app/services/projects/import_service.rb
@@ -9,26 +9,31 @@ module Projects
       'fogbugz',
       'gitlab',
       'github',
-      'google_code'
+      'google_code',
+      'gitlab_project'
     ]
 
     def execute
-      if unknown_url?
-        # In this case, we only want to import issues, not a repository.
-        create_repository
-      else
-        import_repository
-      end
+      add_repository_to_project unless project.gitlab_project_import?
 
       import_data
 
       success
-    rescue Error => e
+    rescue => e
       error(e.message)
     end
 
     private
 
+    def add_repository_to_project
+      if unknown_url?
+        # In this case, we only want to import issues, not a repository.
+        create_repository
+      else
+        import_repository
+      end
+    end
+
     def create_repository
       unless project.create_repository
         raise Error, 'The repository could not be created.'
@@ -46,7 +51,7 @@ module Projects
     def import_data
       return unless has_importer?
 
-      project.repository.before_import
+      project.repository.before_import unless project.gitlab_project_import?
 
       unless importer.execute
         raise Error, 'The remote data could not be imported.'
@@ -58,6 +63,8 @@ module Projects
     end
 
     def importer
+      return Gitlab::ImportExport::Importer.new(project) if @project.gitlab_project_import?
+
       class_name = "Gitlab::#{project.import_type.camelize}Import::Importer"
       class_name.constantize.new(project)
     end