Groovy script for dynamically listing git repository branches as a jenkins build parameter using the extended choice parameter plugin

Jenkins Branch Parameter

/*
* Variable bindings:
*    user - credentials plugin user
*    url - git repository url  (.git)
*/

import com.cloudbees.plugins.credentials.CredentialsProvider;
import com.cloudbees.plugins.credentials.common.StandardUsernamePasswordCredentials;
import jenkins.model.Jenkins

def creds = CredentialsProvider.lookupCredentials(
    StandardUsernamePasswordCredentials.class, 
    Jenkins.instance
);
          
def c = creds.findResult { it.username == user ? it : null }
def pass = c.password;

def repo = "http://" + user + ":" + pass + "@" + url;

return ["/bin/bash", "-c", "git ls-remote -h " + repo + " | sed 's/.*refs\\/heads\\/\\(.*\\)/\\1/'"].execute().text.tokenize();

you saved me 3 hours!!