Trigger workflow on Github push - Pipeline plugin - Multibranch configuration

Question

We are using the pipeline plugin with multibranch configuration for our CD. We have checked in the Jenkinsfile which works off git.

git url: "$url",credentialsId:'$credentials'

The job works fine, but does not auto trigger when a change is pushed to github. I have set up the GIT web hooks correctly.

Interestingly, when I go into a branch of the multibranch job and I click "View Configuration", I see that the "Build when a change is pushed to Github" is unchecked. There is no way to check it since I can not modify the configuration of the job (since it takes from parent) and the same option is not there in parent.

Any ideas how to fix this?

Answer 1

For declarative pipelines try:

pipeline {
    ...
    triggers {
        githubPush()
    }
    ...
}

For me this enables the checkbox "GitHub hook trigger for GITScm polling", but polling is not actually required. This requires the GitHub plugin.

Answer 2

I found a way to check the checkbox "Build when a change is pushed to Github".

This line did the trick:

properties([pipelineTriggers([[$class: 'GitHubPushTrigger'], pollSCM('H/15 * * * *')])])

I think the polling is needed to make it work. Would be nice if no polling is needed.

Here's a Jenkinsfile example with this implemented:

#!/usr/bin/env groovy

node ('master'){
    stage('Build and Test') {
        properties([pipelineTriggers([[$class: 'GitHubPushTrigger'], pollSCM('H/15 * * * *')])])
        checkout scm
        env.PATH = "${tool 'Maven 3'}/bin:${env.PATH}"
        sh 'mvn clean package'
    }
}

Answer 3

For declarative pipelines, try this:

pipeline {
    agent any
    triggers {
        pollSCM('') //Empty quotes tells it to build on a push
    }
}