@@ -66,7 +66,6 @@ def get_gae_versions
 def build_docker_image app_dir, project_id
   image_name = "google-cloud-ruby-test-%.08x" % rand(0x100000000)
   image_location = "us.gcr.io/#{project_id}/#{image_name}"
-  temp_dockerfile = false
   begin
     # Create default Dockerfile if one doesn't already exist
     if File.file? "Dockerfile"
@@ -75,14 +74,14 @@ def build_docker_image app_dir, project_id
       # Copy example Dockerfile and update with correct content
       File.open "#{app_dir}/Dockerfile.example" do |source_file|
         File.open "Dockerfile", "w" do |dest_file|
-          temp_dockerfile = true
           base_image_tag = ENV["GAE_RUBY_BASE_IMAGE_TAG"] || "latest"
           file_content = source_file.read % {
             base_image_tag: base_image_tag
           }
-          dest_file.puts file_content
+          dest_file.write file_content
         end
       end
+      temp_dockerfile = true
     end
 
     sh "docker build -t #{image_location} ."
@@ -117,22 +116,21 @@ def deploy_gke_image image_name, image_location
 
   # Create default acceptace_rc.yaml if one doesn't already exist
   rc_yaml_file_name = "integration_rc.yaml"
-  temp_rc_yaml = false
   if File.file? rc_yaml_file_name
     fail "The #{rc_yaml_file_name} file already exist. Please omit it and " \
   "try again."
   else
     # Copy example yaml file and update with correct content
     File.open "integration/integration_rc.yaml.example" do |source_file|
       File.open rc_yaml_file_name, "w" do |dest_file|
-        temp_rc_yaml = true
         file_content = source_file.read % {
                          image_name: image_name,
                          image_location: image_location
                        }
-        dest_file.puts file_content
+        dest_file.write file_content
       end
     end
+    temp_rc_yaml = true
   end
 
   # Use kubectl to deploy GKE service and validate the GKE pods is running