Detailed status for builds that fail prerequisites

Create FailedUnmetPrerequisites status to allow custom
messaging for builds that were unable to be queued due
to failing to meet prerequisites (eg. failing to create
Kubernetes namespace for deployment).

lib/gitlab/ci/status/build/factory.rb

@@ -16,7 +16,8 @@ module Gitlab
               Status::Build::Skipped],
              [Status::Build::Cancelable,
               Status::Build::Retryable],
-             [Status::Build::Failed],
+             [Status::Build::FailedUnmetPrerequisites,
+              Status::Build::Failed],
              [Status::Build::FailedAllowed,
               Status::Build::Unschedule,
               Status::Build::Play,

lib/gitlab/ci/status/build/failed_unmet_prerequisites.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Status
+      module Build
+        class FailedUnmetPrerequisites < Status::Extended
+          def illustration
+            {
+              image: 'illustrations/skipped-job_empty.svg',
+              size: 'svg-430',
+              title: _('Failed to create resources'),
+              content: _('Retry this job in order to create the necessary resources')
+            }
+          end
+
+          def self.matches?(build, _)
+            build.unmet_prerequisites?
+          end
+        end
+      end
+    end
+  end
+end

spec/factories/ci/builds.rb

@@ -336,6 +336,11 @@ FactoryBot.define do
       failure_reason 2
     end
 
+    trait :prerequisite_failure do
+      failed
+      failure_reason 10
+    end
+
     trait :with_runner_session do
       after(:build) do |build|
         build.build_runner_session(url: 'https://localhost')

spec/lib/gitlab/ci/status/build/factory_spec.rb

@@ -123,6 +123,35 @@ describe Gitlab::Ci::Status::Build::Factory do
         expect(status.action_path).to include 'retry'
       end
     end
+
+    context 'when build has unmet prerequisites' do
+      let(:build) { create(:ci_build, :prerequisite_failure) }
+
+      it 'matches correct core status' do
+        expect(factory.core_status).to be_a Gitlab::Ci::Status::Failed
+      end
+
+      it 'matches correct extended statuses' do
+        expect(factory.extended_statuses)
+          .to eq [Gitlab::Ci::Status::Build::Retryable,
+                  Gitlab::Ci::Status::Build::FailedUnmetPrerequisites]
+      end
+
+      it 'fabricates a failed with unmet prerequisites build status' do
+        expect(status).to be_a Gitlab::Ci::Status::Build::FailedUnmetPrerequisites
+      end
+
+      it 'fabricates status with correct details' do
+        expect(status.text).to eq 'failed'
+        expect(status.icon).to eq 'status_failed'
+        expect(status.favicon).to eq 'favicon_status_failed'
+        expect(status.label).to eq 'failed'
+        expect(status).to have_details
+        expect(status).to have_action
+        expect(status.action_title).to include 'Retry'
+        expect(status.action_path).to include 'retry'
+      end
+    end
   end
 
   context 'when build is a canceled' do

spec/lib/gitlab/ci/status/build/failed_unmet_prerequisites_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+RSpec.describe Gitlab::Ci::Status::Build::FailedUnmetPrerequisites do
+  describe '#illustration' do
+    subject { described_class.new(double).illustration }
+
+    it { is_expected.to include(:image, :size, :title, :content) }
+  end
+
+  describe '.matches?' do
+    let(:build) { create(:ci_build, :created) }
+
+    subject { described_class.matches?(build, double) }
+
+    context 'when build has not failed' do
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when build has failed' do
+      before do
+        build.drop!(failure_reason)
+      end
+
+      context 'with unmet prerequisites' do
+        let(:failure_reason) { :unmet_prerequisites }
+
+        it { is_expected.to be_truthy }
+      end
+
+      context 'with a different error' do
+        let(:failure_reason) { :runner_system_failure }
+
+        it { is_expected.to be_falsey }
+      end
+    end
+  end
+end