Unable to pass values into multiple lines sh section

[Idan Adar]

I'm having difficulty passing parameters into a multiple lines sh section 
like below.
Can someone help with spotting the problem?

Specifically, 
1. $datacenter is empty
2. $clusterName is empty
3. I suspect $repoName is empty too


stage ("Update Deployments") {      
         steps {
            script {
               def repoList = microServicesToPublish.tokenize(",")
               def clusterList = clustersToPublishTo.tokenize(",")
               
               for (String clusterName : clusterList) {
                  for (String repoName : repoList) {
                     
                     // Create a folder based on the current repository in 
the list
                     dir(repoName) {
                        // Clone it
                        git branch: 'master', credentialsId: '****', url: 
"https://****/****/"; + repoName
                        
                        // Apply Kubernetes configuration and update the 
Deployment
                        sh '''
                           datacenter=${repoName:16}
                           export 
KUBECONFIG=/home/bluemix/.bluemix/plugins/container-service/clusters/$clusterName/kube-config-$datacenter-$clusterName.yml
                        
                           # Set the build number
                           case $repoName in
                              "****") 
                                 ../../../yaml w -i 
config/environments/****/$clusterName/kubernetes/deployment.yaml 
spec.template.spec.containers[0].image myregistry/mynamespace/myimage:m 
<http://registry.ng.bluemix.net/certmgmt_prod/instmgr:$instmgr>ytag
                                 ;;
                           esac
                         '''
                      }
                  }
               }
            }
       }          
 }

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