Update minor version of a Pipeline

update-minor.groovy

//http://javadoc.jenkins-ci.org/
/*
* Script for upping the minor version of the starting job, named ARTIFACT_PROJECT
* We expect every version to arrive here following this version strategy: major.minor
*/
import hudson.model.*
import jenkins.model.Jenkins

//Get the parameters
def originalVersion = build.buildVariableResolver.resolve("VERSION")
def artifactProject = build.buildVariableResolver.resolve("ARTIFACT_PROJECT")
//Get the job we are upping
def job = Jenkins.getInstance().getItemByFullName(artifactProject)

assert job != null, "Could not find job with name $artifactProject"
assert originalVersion, "Missing parameter VERSION"

//Iterate and find actions of type Parameters
job.actions.grep{ it instanceof ParametersDefinitionProperty}.each{
  //Assume there is one named VERSION
  def paramVersion = it.getParameterDefinition('VERSION').defaultValue
  //If it is unchanged from the VERSION given to us, go ahead and up it
  if(paramVersion == originalVersion){
      def majorMinorVersion = originalVersion.tokenize('.')
      it.getParameterDefinition('VERSION').setDefaultValue("${majorMinorVersion[0]}.${majorMinorVersion[1].toInteger()+1}")
  }
}
//Ensure that it also works after a restart
job.save()