Make it possible to count a number of job retries

app/models/ci/build.rb

@@ -130,6 +130,14 @@ module Ci
       success? || failed? || canceled?
     end
 
+    def retries_count
+      pipeline.builds.retried.where(name: self.name).count
+    end
+
+    def retries_max
+      self.options.fetch(:retry, 0).to_i
+    end
+
     def latest?
       !retried?
     end

spec/factories/ci/builds.rb

@@ -84,6 +84,10 @@ FactoryGirl.define do
       success
     end
 
+    trait :retried do
+      retried true
+    end
+
     trait :cancelable do
       pending
     end

spec/models/ci/build_spec.rb

@@ -802,6 +802,47 @@ describe Ci::Build, :models do
     end
   end
 
+  describe 'build auto retry feature' do
+    describe '#retries_count' do
+      subject { create(:ci_build, name: 'test', pipeline: pipeline) }
+
+      context 'when build has been retried several times' do
+        before do
+          create(:ci_build, :retried, name: 'test', pipeline: pipeline)
+          create(:ci_build, :retried, name: 'test', pipeline: pipeline)
+        end
+
+        it 'reports a correct retry count value' do
+          expect(subject.retries_count).to eq 2
+        end
+      end
+
+      context 'when build has not been retried' do
+        it 'returns zero' do
+          expect(subject.retries_count).to eq 0
+        end
+      end
+    end
+
+    describe '#retries_max' do
+      context 'when max retries value is defined' do
+        subject { create(:ci_build, options: { retry: 3 }) }
+
+        it 'returns a number of configured max retries' do
+          expect(subject.retries_max).to eq 3
+        end
+      end
+
+      context 'when max retries value is not defined' do
+        subject { create(:ci_build) }
+
+        it 'returns zero' do
+          expect(subject.retries_max).to eq 0
+        end
+      end
+    end
+  end
+
   describe '#keep_artifacts!' do
     let(:build) { create(:ci_build, artifacts_expire_at: Time.now + 7.days) }