Jenkins : Remove Git Plugin BuildsByBranch BuildData

This script is used to remove the static list of BuildsByBranch that is uselessly stored for each build by the Git Plugin.

This is a workaround for the problem described here: https://issues.jenkins-ci.org/browse/JENKINS-19022
Updated to handle Matrix Project types.
Updated to better support SCM Polling
Updated to handle Projects inside Folders.
Updated to handle Pipeline job types (just call getJobNames() to find everything)

import hudson.matrix.*
import hudson.model.*

hudsonInstance = hudson.model.Hudson.instance
jobNames = hudsonInstance.getJobNames()
allItems = []
for (name in jobNames) {
  allItems += hudsonInstance.getItemByFullName(name)
}
 
// Iterate over all jobs and find the ones that have a hudson.plugins.git.util.BuildData
// as an action.
//
// We then clean it by removing the useless array action.buildsByBranchName
//

for (job in allItems) {
  println("job: " + job.name);
  def counter = 0;
  for (build in job.getBuilds()) {
    // It is possible for a build to have multiple BuildData actions
    // since we can use the Mulitple SCM plugin.
    def gitActions = build.getActions(hudson.plugins.git.util.BuildData.class)
    if (gitActions != null) {
      for (action in gitActions) {
        action.buildsByBranchName = new HashMap<String, Build>();
        hudson.plugins.git.Revision r = action.getLastBuiltRevision();
        if (r != null) {
          for (branch in r.getBranches()) {
            action.buildsByBranchName.put(branch.getName(), action.lastBuild)
          }
        }
        build.actions.remove(action)
        build.actions.add(action)
        build.save();
        counter++;
      }
    }
    if (job instanceof MatrixProject) {
      def runcounter = 0;
      for (run in build.getRuns()) {
        gitActions = run.getActions(hudson.plugins.git.util.BuildData.class)
        if (gitActions != null) {
          for (action in gitActions) {
            action.buildsByBranchName = new HashMap<String, Build>();
            hudson.plugins.git.Revision r = action.getLastBuiltRevision();
            if (r != null) {
              for (branch in r.getBranches()) {
                action.buildsByBranchName.put(branch.getName(), action.lastBuild)
              }
            }
            run.actions.remove(action)
            run.actions.add(action)
            run.save();
            runcounter++;
          }
        }
      }
      if (runcounter > 0) {
        println(" -->> cleaned: " + runcounter + " runs");
      }
    }
  }
  if (counter > 0) {
    println("-- cleaned: " + counter + " builds");
  }
}