Jenkins - abort running build if new one is started

Question

I use Jenkins and Multibranch Pipeline. I have a job for each active git branch. New build is triggered by push in git repository. What I want is to abort running builds in

Answer 1

Adding to Brandon Squizzato's answer. If builds are sometimes skipped the milestone mechanism as mentioned will fail. Setting older milestones in a for-loop solves this.

Also make sure you don't have disableConcurrentBuilds in your options. Otherwise the pipeline doesn't get to the milestone step and this won't work.

def buildNumber = env.BUILD_NUMBER as int
for (int i = 1; i < buildNumber; i++)
{
    milestone(i)
}
milestone(buildNumber)