In Jenkins, how to checkout a project into a specific directory (using GIT)

node{
    sh"""
    mkdir('foo')
    """
    dir ('foo') {
        git branch: "<ref spec>", changelog: false, poll: false, url: '<clone url>'
        ......
    }
}

from : https://stackoverflow.com/questions/9767919/in-jenkins-how-to-checkout-a-project-into-a-specific-directory-using-git