Merge branch 'pass-namespace-gitlab-project-import' into 'master'

Fix GitLab project import when a user has access only to their default namespace

## What does this MR do?

It fixes a bug when a namespace ID was not passed to `/import/gitlab_project/new` page. It occurred when a user have no choice of the namespace, so we did not render the input for namespace ID. This MR introduces a hidden input for the described case.

## Does this MR meet the acceptance criteria?

- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Fixes #23507

See merge request !6995

app/views/projects/new.html.haml

@@ -27,6 +27,7 @@
                 - else
                   .input-group-addon.static-namespace
                     #{root_url}#{current_user.username}/
+                  = f.hidden_field :namespace_id, value: current_user.namespace_id
           .form-group.col-xs-12.col-sm-6.project-path
             = f.label :namespace_id, class: 'label-light' do
               %span

spec/features/projects/import_export/import_file_spec.rb

@@ -3,13 +3,8 @@ require 'spec_helper'
 feature 'Import/Export - project import integration test', feature: true, js: true do
   include Select2Helper
 
-  let(:admin) { create(:admin) }
-  let(:normal_user) { create(:user) }
-  let!(:namespace) { create(:namespace, name: "asd", owner: admin) }
   let(:file) { File.join(Rails.root, 'spec', 'features', 'projects', 'import_export', 'test_project_export.tar.gz') }
   let(:export_path) { "#{Dir::tmpdir}/import_file_spec" }
-  let(:project) { Project.last }
-  let(:project_hook) { Gitlab::Git::Hook.new('post-receive', project.repository.path) }
 
   background do
     allow_any_instance_of(Gitlab::ImportExport).to receive(:storage_path).and_return(export_path)
@@ -19,41 +14,43 @@ feature 'Import/Export - project import integration test', feature: true, js: tr
     FileUtils.rm_rf(export_path, secure: true)
   end
 
-  context 'admin user' do
+  context 'when selecting the namespace' do
+    let(:user) { create(:admin) }
+    let!(:namespace) { create(:namespace, name: "asd", owner: user) }
+
     before do
-      login_as(admin)
+      login_as(user)
     end
 
     scenario 'user imports an exported project successfully' do
-      expect(Project.all.count).to be_zero
-
       visit new_project_path
 
-      select2('2', from: '#project_namespace_id')
+      select2(namespace.id, from: '#project_namespace_id')
       fill_in :project_path, with: 'test-project-path', visible: true
       click_link 'GitLab export'
 
       expect(page).to have_content('GitLab project export')
-      expect(URI.parse(current_url).query).to eq('namespace_id=2&path=test-project-path')
+      expect(URI.parse(current_url).query).to eq("namespace_id=#{namespace.id}&path=test-project-path")
 
       attach_file('file', file)
 
-      click_on 'Import project' # import starts
+      expect { click_on 'Import project' }.to change { Project.count }.from(0).to(1)
 
+      project = Project.last
       expect(project).not_to be_nil
       expect(project.issues).not_to be_empty
       expect(project.merge_requests).not_to be_empty
-      expect(project_hook).to exist
-      expect(wiki_exists?).to be true
+      expect(project_hook_exists?(project)).to be true
+      expect(wiki_exists?(project)).to be true
       expect(project.import_status).to eq('finished')
     end
 
     scenario 'invalid project' do
-      project = create(:project, namespace_id: 2)
+      project = create(:project, namespace: namespace)
 
       visit new_project_path
 
-      select2('2', from: '#project_namespace_id')
+      select2(namespace.id, from: '#project_namespace_id')
       fill_in :project_path, with: project.name, visible: true
       click_link 'GitLab export'
 
@@ -66,11 +63,11 @@ feature 'Import/Export - project import integration test', feature: true, js: tr
     end
 
     scenario 'project with no name' do
-      create(:project, namespace_id: 2)
+      create(:project, namespace: namespace)
 
       visit new_project_path
 
-      select2('2', from: '#project_namespace_id')
+      select2(namespace.id, from: '#project_namespace_id')
 
       # click on disabled element
       find(:link, 'GitLab export').trigger('click')
@@ -81,24 +78,30 @@ feature 'Import/Export - project import integration test', feature: true, js: tr
     end
   end
 
-  context 'normal user' do
+  context 'when limited to the default user namespace' do
+    let(:user) { create(:user) }
     before do
-      login_as(normal_user)
+      login_as(user)
     end
 
-    scenario 'non-admin user is allowed to import a project' do
-      expect(Project.all.count).to be_zero
-
+    scenario 'passes correct namespace ID in the URL' do
       visit new_project_path
 
       fill_in :project_path, with: 'test-project-path', visible: true
 
-      expect(page).to have_content('GitLab export')
+      click_link 'GitLab export'
+
+      expect(page).to have_content('GitLab project export')
+      expect(URI.parse(current_url).query).to eq("namespace_id=#{user.namespace.id}&path=test-project-path")
     end
   end
 
-  def wiki_exists?
+  def wiki_exists?(project)
     wiki = ProjectWiki.new(project)
     File.exist?(wiki.repository.path_to_repo) && !wiki.repository.empty?
   end
+
+  def project_hook_exists?(project)
+    Gitlab::Git::Hook.new('post-receive', project.repository.path).exists?
+  end
 end