Jenkins pipeline if else not working

Question

I am creating a sample jenkins pipeline  here is the code   pipeline       agent any       stages               stage  test                  steps                    sh  echo hello                                              stage  test1                  steps                    sh  echo  TEST                                              stage  test3                 if  env BRANCH NAME     master                     echo  I only execute on the master branch                else                   echo  I execute elsewhere                                                                    this pipeline fails with following error logs  Started by user admin org codehaus groovy control MultipleCompilationErrorsException  startup failed  WorkflowScript  15  Not a valid stage section definition   if  env BRANCH NAME     master                     echo  I only execute on the master branch                else                   echo  I execute elsewhere                  Some extra configuration is required    line 15  column 9             stage  test3                   WorkflowScript  15  Nothing to execute within stage  test3    line 15  column 9             stage  test3                    But when i execute the following example from this url  it executes successfully and print the else part   node       stage  Example             if  env BRANCH NAME     master                 echo  I only execute on the master branch            else               echo  I execute elsewhere                      The only difference i can see is that in the working example there is no stages but in my case it has   What is wrong here  can anyone please suggest

User · Accepted Answer

your first try is using declarative pipelines, and the second working one is using scripted pipelines. you need to enclose steps in a steps declaration, and you can't use if as a top-level step in declarative, so you need to wrap it in a script step. here's a working declarative version:

pipeline {
    agent any

    stages {
        stage('test') {
            steps {
                sh 'echo hello'
            }
        }
        stage('test1') {
            steps {
                sh 'echo $TEST'
            }
        }
        stage('test3') {
            steps {
                script {
                    if (env.BRANCH_NAME == 'master') {
                        echo 'I only execute on the master branch'
                    } else {
                        echo 'I execute elsewhere'
                    }
                }
            }
        }
    }
}

you can simplify this and potentially avoid the if statement (as long as you don't need the else) by using "when". See "when directive" at https://jenkins.io/doc/book/pipeline/syntax/. you can also validate jenkinsfiles using the jenkins rest api. it's super sweet. have fun with declarative pipelines in jenkins!

User · Answer

if   params build deploy     1                  println  build deploy     params build deploy                 jobB   build job   k8s-core-user deploy   propagate  false  wait  true  parameters                             string name  environment   value     params environment                              string name  branch name   value     params branch name                              string name  service name   value     params service name                                                              println jobB getResult

User · Answer

It requires a bit of rearranging  but when does a good job to replace conditionals above  Here s the example from above written using the declarative syntax  Note that test3 stage is now two different stages  One that runs on the master branch and one that runs on anything else   stage   Test 3  Master         when   branch  master        steps            echo  I only execute on the master branch             stage   Test 3  Dev         when   not   branch  master          steps           echo  I execute on non-master branches

[jenkins] Jenkins pipeline if else not working

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