What-Is-beforeAgent-true-in-Jenkins.md

Gist for https://youtu.be/EXseAqYxZtw

Documentation

• Evaluating when before entering agent in a stage

Example 1

pipeline {
  agent none
  stages {
    stage('Hello') {
      agent any
      when {
        equals expected: 2, actual: 3
      }
      steps {
        echo 'Hello World'
      }
    }
  }
}

Example 2

pipeline {
  agent none
  stages {
    stage('Hello') {
      agent any
      when {
        expression {
           sleep 10
           return true
        }
      }
      steps {
        echo 'Hello World'
      }
    }
  }
}

Example 3

pipeline {
  agent none
  stages {
    stage('Hello') {
      agent any
      when {
        beforeAgent true  
        expression {
           sleep 10
           return true
        }
      }
      steps {
        echo 'Hello World'
      }
    }
  }
}