How to determine the user who pushed to a remote repo in git using jenkins git plugin?

I need to find the git username/email of a person who is pushing changes, consisting of different commits by different users, to a remote repository.

The push triggers a Post-Receive hook via gitblit which triggers a jenkins job, and is using a non user specific SSH authentication.

I had to

1. define a gitblit user and use it for pushing the changes.
2. change my jenkins job to a parameterized one and define a parameter for the username (myuser).
3. add the username in my hook

.

def triggerUrl = jenkinsUrl + "/job/" + jenkinsJob + "/buildWithParameters?token=" + jenkinsToken + "&myuser=" + user.getName()
new URL(triggerUrl).getText()

myuser is now an enviroment variable, here as an example in an ant script :

<property environment="env" />
<target name="xx" description="xx">
    <echo message="${env.myuser}" />
</target>