How to get pull request id from Jenkins Pipeline

Question

I'm trying to analyse my source code with Sonar using Jenkins pipelines. To ask Sonar to notify Github with the results I need to specify the Pull Request ID.

How can I get this Pull Request ID from Jenkins Pipelines?

We are using GitHub Organization Folder Plugin to build pull requests, not GitHub pull request builder plugin. That's why $ghprbPullId is not working for me. Any ideas how to get the pull request id in a different way?

Answer 1

Jenkins exposes a global variable named CHANGE_ID:

For a multibranch project corresponding to some kind of change request, this will be set to the change ID, such as a pull request number.

This variable is only populated for pull request builds, so you have to disable branch builds and enable PR builds in your pipeline's configuration for branch sources:

My pipeline step then looks like this:

def PULL_REQUEST = env.CHANGE_ID

stage('Analysis') {
        withCredentials([[$class: 'StringBinding', credentialsId: '***', variable: 'GITHUB_ACCESS_TOKEN']]) {
            withSonarQubeEnv('Sonar') {
                withMaven(maven: 'M3') {
                    sh "mvn org.sonarsource.scanner.maven:sonar-maven-plugin:3.2:sonar " +
                            "-Dsonar.analysis.mode=preview " +
                            "-Dsonar.github.pullRequest=${PULL_REQUEST} " +
                            "-Dsonar.github.oauth=${GITHUB_ACCESS_TOKEN}"
                }
            }
        }
    }