Hide new mr from dropdown for archived projects

app/helpers/merge_requests_helper.rb

@@ -138,6 +138,18 @@ module MergeRequestsHelper
     end
   end
 
+  def merge_request_source_project_for_project(project = @project)
+    unless can?(current_user, :create_merge_request_in, project)
+      return nil
+    end
+
+    if can?(current_user, :create_merge_request_from, project)
+      project
+    else
+      current_user.fork_of(project)
+    end
+  end
+
   def merge_params_ee(merge_request)
     {}
   end

app/views/layouts/header/_new_dropdown.haml

@@ -20,7 +20,7 @@
 
       - if @project&.persisted?
         - create_project_issue = can?(current_user, :create_issue, @project)
-        - merge_project = can?(current_user, :create_merge_request, @project) ? @project : (current_user && current_user.fork_of(@project))
+        - merge_project = merge_request_source_project_for_project(@project)
         - create_project_snippet = can?(current_user, :create_project_snippet, @project)
         - if create_project_issue || merge_project || create_project_snippet
           %li.dropdown-bold-header This project

spec/features/projects/show/user_sees_collaboration_links_spec.rb

+require 'spec_helper'
+
+describe 'Projects > Show > Collaboration links' do
+  let(:project) { create(:project, :repository) }
+  let(:user) { create(:user) }
+
+  before do
+    project.add_developer(user)
+    sign_in(user)
+  end
+
+  it 'shows all the expected links' do
+    visit project_path(project)
+
+    # The navigation bar
+    page.within('.header-new') do
+      aggregate_failures 'dropdown links in the navigation bar' do
+        expect(page).to have_link('New issue')
+        expect(page).to have_link('New merge request')
+        expect(page).to have_link('New snippet', href: new_project_snippet_path(project))
+      end
+    end
+
+    # The project header
+    page.within('.project-home-panel') do
+      aggregate_failures 'dropdown links in the project home panel' do
+        expect(page).to have_link('New issue')
+        expect(page).to have_link('New merge request')
+        expect(page).to have_link('New snippet')
+        expect(page).to have_link('New file')
+        expect(page).to have_link('New branch')
+        expect(page).to have_link('New tag')
+      end
+    end
+
+    # The dropdown above the tree
+    page.within('.repo-breadcrumb') do
+      aggregate_failures 'dropdown links above the repo tree' do
+        expect(page).to have_link('New file')
+        expect(page).to have_link('Upload file')
+        expect(page).to have_link('New directory')
+        expect(page).to have_link('New branch')
+        expect(page).to have_link('New tag')
+      end
+    end
+
+    # The Web IDE
+    expect(page).to have_link('Web IDE')
+  end
+
+  it 'hides the links when the project is archived' do
+    project.update!(archived: true)
+
+    visit project_path(project)
+
+    page.within('.header-new') do
+      aggregate_failures 'dropdown links' do
+        expect(page).not_to have_link('New issue')
+        expect(page).not_to have_link('New merge request')
+        expect(page).not_to have_link('New snippet', href: new_project_snippet_path(project))
+      end
+    end
+
+    page.within('.project-home-panel') do
+      aggregate_failures 'dropdown links' do
+        expect(page).not_to have_link('New issue')
+        expect(page).not_to have_link('New merge request')
+        expect(page).not_to have_link('New snippet')
+        expect(page).not_to have_link('New file')
+        expect(page).not_to have_link('New branch')
+        expect(page).not_to have_link('New tag')
+      end
+    end
+
+    page.within('.repo-breadcrumb') do
+      aggregate_failures 'dropdown links' do
+        expect(page).not_to have_link('New file')
+        expect(page).not_to have_link('Upload file')
+        expect(page).not_to have_link('New directory')
+        expect(page).not_to have_link('New branch')
+        expect(page).not_to have_link('New tag')
+      end
+    end
+
+    expect(page).not_to have_link('Web IDE')
+  end
+end