Q:

Jenkins and Gerrit integration with google repo scm

I am writing because there is something not clear to me on how to configure jenkins to fetch from gerrit the changes for building my project.
There is a lot of tutorial / examples on the net related to how to connect all those piece of code.
But I didn't found any that explain what I want to do.
I think it's possible but... well. I'm not sure.
My setup:
I have a repo manifest that contains a lot of different modules of the final application. The app was written in this way because I can change a module and substitute it with another with similar code that do a different job. For example they can be personalization for different customers.
I setup a job in jenkins that catch every commit in each submodule. 
I connected Jenkins to Gerrit and I can start the build with gerrit trigger. 
It works and I can build my master and the current master.
My problem is that when I send a patch for review jenkins build the master, not the patch I sent. I would like to test the last patch before integrating it on master.
Modules cannot be built standalone because they are all connected in some way so I cannot check each part alone. 
Someone was able to accomplish something like this?

A:

When the Gerrit Trigger start the Jenkins job, you could execute the following to prepare the workspace before you execute the build:

Use "repo sync" to checkout all repositories
Use the GERRIT_PROJECT and GERRIT_REFSPEC Gerrit Trigger env variables and execute the following commands to checkout the patchset of the changed repository:
cd $GERRIT_PROJECT
git fetch https://USER@SERVER/a/$GERRIT_PROJECT $GERRIT_REFSPEC && git checkout FETCH_HEAD
OR
git fetch ssh://USER@SERVER:29418/$GERRIT_PROJECT $GERRIT_REFSPEC && git checkout FETCH_HEAD

