Pipeline: Fails reading build cause

[Sverre Moe]

I have tried reading the build cause as suggested in this example

https://github.com/jenkinsci/pipeline-examples/tree/master/pipeline-examples/get-build-cause

Accessing the build cause outside of a node causes the pipeline to fail right after entering the first stage and without an error or exception.

void main(def args) {
  def causes = currentBuild.rawBuild.getCauses()
  stage 'Checkout'
  node {
    scm checkout
  }
}

Accessing the build cause within a node throws exception java.io.NotSerializableException: hudson.model.Cause$UserIdCause

void main(def args) {
  stage 'Checkout'
  node {
    def causes = currentBuild.rawBuild.getCauses()
    scm checkout
  }
}

So I put it within a @NonCPS method, but it still fails the same way as before.

void main(def args) {
stage 'Checkout'
node {
  def cause = getLastBuildCause()
scm checkout
}
}

@NonCPS

def getLastBuildCause() {

    def causes = currentBuild.rawBuild.getCauses()

    return causes.last()

}

 

I need to find out who or what caused the build, to find out if it is an upstream project. Unless there is some other access methods for this?

[Sverre Moe]

I found a JENKINS issue dealing with NonCPS

https://issues.jenkins-ci.org/browse/JENKINS-31314

Tried the suggestion in the last comment and only call the NonCPS methods from the master node.

Seems I really need to define a heavyweight executor on the master. Reading the build cause on a flyweight executor fails or any other heavyweight executor than master.

[Antonio Muñiz]

You need to do all the work with non-serializable objects inside the @NonCPS annotated function and return a serializable object.

In your example you are storing the result of `getLastBuildCause` outside the non-cps function. Try return a `String` there.

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Antonio Muñiz

Software Engineer
CloudBees, Inc.