title: On a build of a Jenkins job, is it possible to change build parameters midway through?
body: <p>We are using Jenkins to automate several of our build and test processes.  For some of our process, the engineer starting the build needs to specify a parameter.  But the range of possible and optimal values for that parameter change throughout the course of the day.</p>
  
  <p>What I would like to do is let the engineer specify a value - if they know an optimal value - or leave it blank and have a value be calculated by an early build step.  If the value is calculated, I would like the calculating build step to update the parameter value of the job.  That way, all subsequent build steps don't have to worry about using the parameter or calculating it, they just use the parameter regardless.</p>
  
  <p>It looks like the <a href="https://wiki.jenkins-ci.org/display/JENKINS/Groovy+plugin" rel="noreferrer" title="Groovy Script Plugin">Groovy Script Plugin</a> might be able to do this, but I can't see how I can SET the build parameters, just GET them.</p>