jenkins pipeline example

1. this project is parameterized(string, choice)

2. pipeline

   pipeline {
   
       agent any
   
       stages {
           stage('checkout') {
               when {
                   expression {
                       return params.action == 'deploy'
                   }
               }
               steps {
                   dir('/git/projectName/') {
                       checkout([$class: 'GitSCM',
                       branches: [[name: "${tag}"]],
                       doGenerateSubmoduleConfigurations: false,
                       extensions: [],
                       gitTool: 'Default',
                       submoduleCfg: [],
                       userRemoteConfigs: [[credentialsId: '12345678-1234-1234-1234-123456789012', url: 'https://chenshi.net/projectName']]
                       ])
                   }
               }
           }
           stage('build') {
               when {
                   expression {
                       return params.action == 'deploy'
                   }
               }
               steps {
                   dir('/git/projectName/') {
                       sh'''
                       mvn clean package -Ddocker-image.tag=${tag} -DpushImage
                       '''
                   }
               }
           }
           stage('deploy') {
               when {
                   expression {
                       return params.action == 'deploy'
                   }
               }
               steps {
                   sh '''
                   /yaml/test-projectName.sh ${tag}
                   '''
               }
           }
           stage('rollback') {
               when {
                   expression {
                       return params.action == 'rollback'
                   }
               }
               steps {
                       sh """
                       /yaml/rollback.sh ${JOB_NAME} ${tag}
                       """
               }
           }
       }
   }