Re-test a project if one or more of its dependencies is updated

Using Jenkins
21

There is the Generic Webhook Trigger plugin. Remains the problem how to decide which projects to build in a reliable way so that when a new dependency is added the job will trigger when that new dependency changes

22

You can create triggers dynamically from the pipeline ( which would become active once the pipeline has run once (at least with a scripted pipeline). So you in your ../project-xx jons you need to parse composer.json andfind your repos you want to trigger on.

Pseudo code, the details you have to fill in yourself:

@NonCPS
def parseRepos (content) {
    def json = new JsonSlurper().parseText(content)
    // Prepare a List to collect the tag names into
    def tmp = json.keySet()  as String[];
    def result = new ArrayList<String>();
    tmp.each () {
     < add logic to get relevant projects here> 
    }
    return result
}

stage (updatetriggers) {
// run after checkout
  content = <read file>
  res = parseRepos(content)
  create triggers from result
  properties([triggers : your create trigger defs ])
}