How to pass ${CHANGES} to downstream job?

Question

I have upstream job that polls SVN for changes. If changes are detected, the build is started. After the build, the upstream project calls downstream project to run test.

Answer 1

You can get the change set or the values you need with groovy script:

def jenkins = Jenkins.getInstance()
def job = jenkins.getItem(jobName)
def bld = job.getBuildByNumber(buildNumber)
def changeSet = bld.getChangeSet()

then it dependents on which scm plugin you use, for example with git-plugin you can:

get the revision of each change:

changeSet.each{
    println it.getRevision()
}

get message for each change:

changeSet.each{
    println it.getMsg()
}

get affected paths:

changeSet.each{
   println it.getAffectedPaths()
}

get author name:

changeSet.each{
    println it.getAuthorName()
}

and many more actions

Answer 2

I saw a All Changes Plugin which updates the changes page. Don't know if $Changes gets populated with that info as well.

If that doesn't work, have a look at Get access to Build Changelog in Jenkins