Do not show build retry link when build is active

app/views/projects/builds/_sidebar.html.haml

@@ -40,7 +40,7 @@
   .block{ class: ("block-first" if !@build.coverage && !(can?(current_user, :read_build, @project) && (@build.artifacts? || @build.artifacts_expired?))) }
     .title
       Build details
-      - if @build.retryable?
+      - if @build.retryable? && !@build.active?
         = link_to "Retry", retry_namespace_project_build_path(@project.namespace, @project, @build), class: 'pull-right', method: :post
     - if @build.merge_request
       %p.build-detail-row

spec/views/projects/builds/show.html.haml_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+describe 'projects/builds/show' do
+  include Devise::TestHelpers
+
+  let(:build) { create(:ci_build) }
+  let(:project) { build.project }
+
+  before do
+    assign(:build, build)
+    assign(:project, project)
+
+    allow(view).to receive(:can?).and_return(true)
+  end
+
+  context 'when build is running' do
+    before do
+      build.run!
+      render
+    end
+
+    it 'does not show retry button' do
+      expect(rendered).not_to have_link('Retry')
+    end
+  end
+
+  context 'when build is not running' do
+    before do
+      build.success!
+      render
+    end
+
+    it 'shows retry button' do
+      expect(rendered).to have_link('Retry')
+    end
+  end
+end