public void addEnvironmentVariableToPipeline(
     String pipelineName, EnvironmentVariablesConfig envVars) {
   CruiseConfig cruiseConfig = loadForEdit();
   PipelineConfig pipelineConfig =
       cruiseConfig.pipelineConfigByName(new CaseInsensitiveString(pipelineName));
   pipelineConfig.setVariables(envVars);
   writeConfigFile(cruiseConfig);
 }