How to change a Jenkins Declarative Pipeline environment variable?

Question

I'm trying to create some Docker images. For that I want to use the version number specified in the Maven pom.xml file as tag. I am however rather new to the declarative Jenkins pipelines and I can't figure out how to change my environment variable so that VERSION contains the right version for all stages.

This is my code

#!groovy

pipeline {
    tools { 
        maven 'maven 3.3.9' 
        jdk 'Java 1.8' 
    }
    environment {
        VERSION = '0.0.0'
    }

    agent any 

    stages {
        stage('Checkout') { 
            steps {
                git branch: 'master', credentialsId: '290dd8ee-2381-4c5b-8d33-5631d03ee7be', url: 'git@gitlab.crosslang.local:company/SOME-API.git'
                sh "git clean -f && git reset --hard origin/master"
            }
        }
        stage('Build and Test Java code') {
            steps {
                script {
                    def pom = readMavenPom file: 'pom.xml'
                    VERSION = pom.version
                }
                echo "${VERSION}"
                sh "mvn clean install -DskipTests"
            }
        }
        stage('Build Docker images') {
            steps {
                dir('whales-microservice/src/main/docker'){
                    sh 'cp ../../../target/whales-microservice-${VERSION}.jar whales-microservice.jar'
                    script {
                        docker.build "company/whales-microservice:${VERSION}"
                    }
                }
            }
        }
    }
}

What is exactly your problem? The VERSION in stage 'Build Docker images' doesn't contain the version number which was assigned in `VERSION = pom.version`? — haschibaschi, May 09 '17 at 18:23
That is indeed the problem. It is only available in the 'Build and Test Java code' stage. — Bram Vandewalle, May 10 '17 at 07:02

score 12 · Accepted Answer · answered May 10 '17 at 13:42

12

The problem is the single quote of the statement

sh 'cp ../../../target/whales-microservice-${VERSION}.jar whales-microservice.jar'

single quotes don't expand variables in groovy: http://docs.groovy-lang.org/latest/html/documentation/#_string_interpolation

so you have to double quote your shell statement:

sh "cp ../../../target/whales-microservice-${VERSION}.jar whales-microservice.jar"

answered May 10 '17 at 13:42

haschibaschi

2,734
23
31

2

This highlights the difference between Strings and GStrings (Groovy Strings). Variables are interpolated in GStrings (double quotes) and not in Strings (single quotes). – user944849 Jan 25 '18 at 17:26

Tobske · Answer 2 · 2018-08-10T08:28:24.833

0

I just wanted to mention that if you have pipeline-utility-steps plugin installed you can use readMavenPom() in the environment part, too. It looks like this:

environment {
    VERSION = readMavenPom().getVersion()
}

edited Aug 10 '18 at 08:28

answered Jun 28 '18 at 06:32

Tobske

518
3
12

this is not working java.lang.NoSuchMethodError: No such DSL method 'readMavenPom' found among steps [archive, bat, build, – ImranRazaKhan Jul 06 '18 at 21:14
1

@ImranRazaKhan Do you have the pipeline-utility-steps plugin installed? See [here](https://stackoverflow.com/questions/37197013/cannot-use-readmavenpom-in-jenkinsfile) – Tobske Jul 11 '18 at 16:24

How to change a Jenkins Declarative Pipeline environment variable?

2 Answers2