Question was about triggering CI build on Studio change, but it can also be used for automatic emailing, or any other kind of notification.
From the discussion on email@example.com:
We currently don't want to expose the Studio projects' SCM, we cannot (for various security and technical reasons) and it wouldn't be reliable (there are some slight differences between Studio "commit"/"tag"/"save" features and the underlying Git commits).
Maven polling would work as is. But we shouldn't encourage it since such a behavior quickly overloads the targeted server. On CI, I stopped using it for a while since it was killing our servers.
The best solution is the one suggestion by Mathieu: add a feature into Studio for registering URLs to notify when there's a change. Exactly like what we do for GitHub + Jenkins. Moreover, it's technically easy to add an URL push on the save or commit actions for instance.
There's a generic hook management based on a token
=> that's what we use for Mercurial triggering
The client can add a intermediate processing receiving the push from Studio, doing some stuff, then forwarding it to Jenkins with the above hook
=> that's what we do for commit emails; see https://hgpriv.nuxeo.org/admin/github-hooks/file/b3776efabfb0 ; URL is https://qa.nuxeo.org/githooks/send-email
There's a specific Jenkins GitHub plugin, listening to $JENKINS_URL/github-webhook/. It enhances the default token based hook and could easily be forked and adapted to Studio.
=> that's what we do for GitHub triggering; URL is https://qa.nuxeo.org/jenkins/github-webhook/
Hook implementation Studio-side:
- add the possibility to register URLs which will be notified (including authentication parameters),
- with checkboxes, choose when to be notified (on change, commit, tag, ...),
- define and document the JSON structure which will be sent,
- sample the triggering configuration.
Tests can be done to trigger builds on QA priv.