Implement Command#ambiguous_ref?

lib/gitlab/ci/pipeline/chain/command.rb

@@ -57,6 +57,12 @@ module Gitlab
               project.protected_for?(origin_ref)
             end
           end
+
+          def ambiguous_ref?
+            strong_memoize(:ambiguous_ref) do
+              project.repository.ambiguous_ref?(origin_ref)
+            end
+          end
         end
       end
     end

lib/gitlab/ci/pipeline/chain/validate/repository.rb

@@ -17,7 +17,7 @@ module Gitlab
                 return error('Commit not found')
               end
 
-              if @command.project.repository.ambiguous_ref?(@command.origin_ref)
+              if @command.ambiguous_ref?
                 return error('Ref is ambiguous')
               end
             end

spec/lib/gitlab/ci/pipeline/chain/command_spec.rb

@@ -182,4 +182,24 @@ describe Gitlab::Ci::Pipeline::Chain::Command do
       it { is_expected.to eq(false) }
     end
   end
+
+  describe '#ambiguous_ref' do
+    let(:project) { create(:project, :repository) }
+    let(:command) { described_class.new(project: project, origin_ref: 'ref') }
+
+    subject { command.ambiguous_ref? }
+
+    context 'when ref is not ambiguous' do
+      it { is_expected. to eq(false) }
+    end
+
+    context 'when ref is ambiguous' do
+      before do
+        project.repository.add_tag(project.creator, 'ref', 'master')
+        project.repository.add_branch(project.creator, 'ref', 'master')
+      end
+
+      it { is_expected. to eq(true) }
+    end
+  end
 end