Not able to use for loop for helm based application deployment in jenkins declarative pipeline

[kavita1205]

Describe the bug

I have created jenkins declarative pipeline, which is using helm for application deployment. I am using for loop in my declarative pipeline but it is not working.

I tried using both the approaches , a) mentioning loop inside scripts, b) using for loop outside script section but still my jenkins job is not able to deploy (not working).

Can someone help me here how can I use for loop when I need to deploy for multiple helm applications.

pipeline {
    agent {
        // Build global agent definition
            label 'DOCKER-LINUX'
    }   
    parameters {
        // Build paramaters
        string(defaultValue: 'jenkins-k8s-credentials',
               description: 'Enter the kubeconfig jenkins credentialID, this set the k8s cluster:', name: 'kubeconfigFile')
        string(defaultValue: 'penni-build-access-token',
               description: 'Enter the SCM jenkins credentialID', name: 'scmCredentials')
        string(defaultValue: '333d2bd2-5c8e-4ff7',
               description: 'Enter name of the helm private respository Jenkins credentials', name: 'helmCredentials')
        string(defaultValue: 'ML42_minion_Deployment',
               description: 'Enter the Jenkins credenitals id that contains the age key used to de-crypt the helm chart secrets. This needs to be the same key used to encrypted', name: 'ageKey')
        choice(choices: ['','lv-dev', 'lv-prod'], 
               description: 'Enter the NAMESPACE', name: 'NAMESPACE')
        choice(choices: ['','dev', 'prod'], 
               description: 'Enter the ENVIRONMENT', name: 'ENVIRONMENT')
        string(defaultValue: '1.44.1', 
               description: 'Enter the mincpu_file_to deploy', name: 'APP_VERSION')
        string(defaultValue: '02,03,04', 
               description: 'Enter the mincpu_file_to deploy in case of production deployment', name: 'MINCPU_FILE')
   }
    options {
        // Build options
        buildDiscarder(logRotator(numToKeepStr: '3'))
        disableConcurrentBuilds()
        timeout(time: 30, unit: 'MINUTES')
    }
     stage("Approval Production Stage") {
            agent {
                // Build stage agent definition
                dockerfile {
                    label 'DOCKER-LINUX'
                    args '-u root --dns 10.10.16.*** --dns 10.10.**.*** --dns-search corp.com'
                    reuseNode true
                }
            }
            // Check your branch is production
            when {
                expression { 
                    "${ENVIRONMENT}" == 'prod'
                } 
            }
            // Whole for approval
            steps {
                input message: 'Deploy to Prod?', submitter: 'tom@*****.com'
            }
        }
        stage("Deploy to Production for Minions") {
            agent {
                // Build stage agent definition
                dockerfile {
                    label 'DOCKER-LINUX'
                    args '-u root --dns 10.10.**** --dns 10.10.***** --dns-search corp.com'
                    reuseNode true
                }
            }
            when {
                expression { 
                    "${ENVIRONMENT}" == 'prod'
                } 
            }
            steps {

                // Add repo
                withCredentials([usernamePassword(credentialsId: "${params.helmCredentials}", passwordVariable: 'KEY', usernameVariable: 'USER'),
                                 file(credentialsId: "${params.ageKey}", variable: 'ageKey'),
                                 file(credentialsId: "${params.kubeconfigFile}", variable: 'KUBECONFIG')]) {
                    sh ('helm repo add ****-helm-repository https://artifacts.corp.com/artifactory/x****-helm-repository --username ${USER} --password ${KEY} --pass-credentials')
                    sh ('helm repo update')
                    
                    // Copy the Age key
                    sh ('cp \$ageKey /tmp/.config/sops/age/keys.txt')
                    
                    // create namespace
                    sh ('kubectl create namespace ml42-lv-\$ENVIRONMENT > /dev/null 2>&1 || true ')
             script {
                    env.CHARTV =  input message: 'What version do you want to deploy',
                                    parameters: [string(defaultValue: '',
                                    description: 'Enter the version of the helm chart you want to deploy',
                                    name: 'Helm Chart Version to Deploy')]

                  MINCPU_FILE.each(){

                     //decrypt secret key and deploy for mlcpu        
                    sh ('echo KUBECONFIG=\$KUBECONFIG helm secrets upgrade --install ml42cpuminions-\$MINCPU_FILE helm-repository/minions --set appVersion="${APP_VERSION}" --set docker.tag="{APP_VERSION}" -f minions/env/\$ENVIRONMENT/mlcpu/$MINCPU_FILE.yaml \
                        -f minions/env/\$ENVIRONMENT/values.yaml -f minions/secrets.yaml -f minions/env/\$ENVIRONMENT/secrets.yaml -n lv-\$ENVIRONMENT --version "${CHARTV}" --wait --timeout 20m0s --reuse-values ')

                      }              
                        
                    }
                }
            }
        }
       
    }
    post {
        always {
            cleanWs deleteDirs: true, notFailBuild: true
        }
    }  
}

Version of Helm and Kubernetes

- Helm: 
- Kubernetes:

Chart version

jenkins-2.346

What happened?

1.
2.
3.
...

What you expected to happen?

No response

How to reproduce it

No response

Anything else we need to know?

No response