Store override params as import data on projects

This means import data doesn't necessarily have to have an import_url
anymore.

The `ProjectImportData` could just contain the override data in it's
serialized data attribute.

The import data is automatically cleaned up after it is finished by
the state machine.

app/models/project.rb

@@ -630,7 +630,7 @@ class Project < ActiveRecord::Base
   end
   def create_or_update_import_data(data: nil, credentials: nil)
-    return unless import_url.present? && valid_import_url?
+    return if data.nil? && credentials.nil?
     project_import_data = import_data || build_import_data
     if data

app/services/projects/gitlab_projects_import_service.rb

@@ -5,8 +5,8 @@ module Projects
   class GitlabProjectsImportService
     attr_reader :current_user, :params
-    def initialize(user, params)
-      @current_user, @params = user, params.dup
+    def initialize(user, import_params, override_params = nil)
+      @current_user, @params, @override_params = user, import_params.dup, override_params
     end
     def execute
@@ -17,6 +17,7 @@ module Projects
       params[:import_type] = 'gitlab_project'
       params[:import_source] = import_upload_path
+      params[:import_data] = { data: { override_params: @override_params } } if @override_params
       ::Projects::CreateService.new(current_user, params).execute
     end

lib/api/project_import.rb

 module API
   class ProjectImport < Grape::API
     include PaginationParams
+    include Helpers::ProjectsHelpers
     helpers do
       def import_params
@@ -25,6 +26,11 @@ module API
         requires :path, type: String, desc: 'The new project path and name'
         requires :file, type: File, desc: 'The project export file to be imported'
         optional :namespace, type: String, desc: "The ID or name of the namespace that the project will be imported into. Defaults to the current user's namespace."
+        optional :override_params,
+                 type: Hash,
+                 desc: 'New project params to override values in the export' do
+          use :optional_project_params
+        end
       end
       desc 'Create a new project import' do
         detail 'This feature was introduced in GitLab 10.6.'
@@ -47,7 +53,11 @@ module API
             file: import_params[:file]['tempfile']
         }
-        project = ::Projects::GitlabProjectsImportService.new(current_user, project_params).execute
+        override_params = import_params.delete(:override_params)
+
+        project = ::Projects::GitlabProjectsImportService.new(
+          current_user, project_params, override_params
+        ).execute
         render_api_error!(project.errors.full_messages&.first, 400) unless project.saved?

spec/requests/api/project_import_spec.rb

@@ -40,7 +40,7 @@ describe API::ProjectImport do
       expect(response).to have_gitlab_http_status(201)
     end
-    it 'schedules an import at the user namespace level' do
+    it 'does not shedule an import for a nampespace that does not exist' do
       expect_any_instance_of(Project).not_to receive(:import_schedule)
       expect(::Projects::CreateService).not_to receive(:new)
@@ -71,6 +71,34 @@ describe API::ProjectImport do
       expect(json_response['error']).to eq('file is invalid')
     end
+    it 'allows overriding project params' do
+      stub_import(namespace)
+      override_params = { 'description' => 'Hello world' }
+
+      post api('/projects/import', user),
+           path: 'test-import',
+           file: fixture_file_upload(file),
+           namespace: namespace.id,
+           override_params: override_params
+      import_project = Project.find(json_response['id'])
+
+      expect(import_project.import_data.data['override_params']).to eq(override_params)
+    end
+
+    it 'does store params that are not allowed' do
+      stub_import(namespace)
+      override_params = { 'not_allowed' => 'Hello world' }
+
+      post api('/projects/import', user),
+           path: 'test-import',
+           file: fixture_file_upload(file),
+           namespace: namespace.id,
+           override_params: override_params
+      import_project = Project.find(json_response['id'])
+
+      expect(import_project.import_data.data['override_params']).to be_empty
+    end
+
     def stub_import(namespace)
       expect_any_instance_of(Project).to receive(:import_schedule)
       expect(::Projects::CreateService).to receive(:new).with(user, hash_including(namespace_id: namespace.id)).and_call_original

spec/services/projects/gitlab_projects_import_service_spec.rb

@@ -2,8 +2,10 @@ require 'spec_helper'
 describe Projects::GitlabProjectsImportService do
   set(:namespace) { create(:namespace) }
+  let(:path) { 'test-path' }
   let(:file) { fixture_file_upload(Rails.root + 'spec/fixtures/doc_sample.txt', 'text/plain') }
-  subject { described_class.new(namespace.owner, { namespace_id: namespace.id, path: path, file: file }) }
+  let(:import_params) { { namespace_id: namespace.id, path: path, file: file } }
+  subject { described_class.new(namespace.owner, import_params) }
   describe '#execute' do
     context 'with an invalid path' do
@@ -18,8 +20,6 @@ describe Projects::GitlabProjectsImportService do
     end
     context 'with a valid path' do
-      let(:path) { 'test-path' }
-
       it 'creates a project' do
         project = subject.execute
@@ -27,5 +27,15 @@ describe Projects::GitlabProjectsImportService do
         expect(project).to be_valid
       end
     end
+
+    context 'override params' do
+      it 'stores them as import data when passed' do
+        project = described_class
+                    .new(namespace.owner, import_params, description: 'Hello')
+                    .execute
+
+        expect(project.import_data.data['override_params']['description']).to eq('Hello')
+      end
+    end
   end
 end