Use tag/branch methods to check if pipeline ref exists

app/services/ci/create_pipeline_service.rb

@@ -107,8 +107,7 @@ module Ci
     def tag?
       return @is_tag if defined?(@is_tag)
 
-      @is_tag =
-        project.repository.ref_exists?(Gitlab::Git::TAG_REF_PREFIX + ref)
+      @is_tag = project.repository.tag_exists?(ref)
     end
 
     def ref
@@ -120,7 +119,8 @@ module Ci
     end
 
     def pipeline_created_counter
-      @pipeline_created_counter ||= Gitlab::Metrics.counter(:pipelines_created_total, "Counter of pipelines created")
+      @pipeline_created_counter ||= Gitlab::Metrics
+        .counter(:pipelines_created_total, "Counter of pipelines created")
     end
   end
 end

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

@@ -79,22 +79,16 @@ module Gitlab
             end
           end
 
-          ## TODO, move to Pipeline as `branch_exists?`
-          #
           def branch?
             return @is_branch if defined?(@is_branch)
 
-            @is_branch = project.repository
-              .ref_exists?(Gitlab::Git::BRANCH_REF_PREFIX + pipeline.ref)
+            @is_branch = project.repository.branch_exists?(pipeline.ref)
           end
 
-          ## TODO, move to pipeline as `tag_exists?`
-          #
           def tag?
             return @is_tag if defined?(@is_tag)
 
-            @is_tag = project.repository
-              .ref_exists?(Gitlab::Git::TAG_REF_PREFIX + pipeline.ref)
+            @is_tag = project.repository.tag_exists?(pipeline.ref)
           end
 
           def error(message)