Jenkins - investigate job causes (e.g. to find SCM sources)

gistfile1.txt

// Paste to your JENKINS_URL/script console:

def job = Jenkins.instance.getItemByFullName("org/repo/branch")
println "job: ${job}"
def build = job.getBuildByNumber(123)

println build

def commitHashForBuild(build) {
  def scmAction = null
  build?.actions.each { action ->
    println "action: <${action?.getClass()}>'${action}'"
    if (action instanceof jenkins.scm.api.SCMRevisionAction)
    	scmAction = action
  }
  println "scmAction: <${scmAction?.getClass()}>'${scmAction}'"
  println "scmAction.revision: <${scmAction?.revision?.getClass()}>'${scmAction?.revision}'"
  println "scmAction.revision.hash: <${scmAction?.revision?.hash?.getClass()}>'${scmAction?.revision?.hash}'"
  return scmAction?.revision?.hash
}

println commitHashForBuild(build)