Run Groovy script only on Matrix parent

[Sverre Moe]

The groovy script executed by Groovy Postbuild does not run on Matrix parent if this Post build publisher comes from a template project.

There is an issue for this: https://issues.jenkins-ci.org/browse/JENKINS-27317

I order for the script to run on my several hundred jobs I would have to duplicate this script under each job. Maintenance would be a nightmare.

Thankfully Execute System Groovy script could load the script from a file, thus I solve my script duplication problem. It exposes some of the same variables as Groovy Postbuild, such as the current build. However I cannot get the script to run only on Matrix parent

Build -> Execute System Groovy script -> Script command

import hudson.matrix.MatrixBuild;
import hudson.matrix.MatrixRun;

if (build instanceof MatrixRun) {
  println "MatrixRun child"
} else if (build instanceof MatrixBuild) {
  println "MatrixBuild parent"
}

It seems it only runs on each matrix build configurations (childs).

[Sverre Moe]

I came by an immediate fix:

Using this Groovy Postbuild script on all my jobs

import hudson.matrix.MatrixBuild;
import hudson.matrix.MatrixRun;

if (manager.buildIsA(MatrixBuild.class)) {
    evaluate(new File("build-downstream-projects.groovy"))
}

A little bit duplication, but the main logic remains in the groovy script file.