In Jenkins, how do builds know who requested them?

Question

I need to pass the username of the requestor of a build down to the script that is actually doing the work. Looking at the console output for a particular build, the first

Answer 1

import os
import jenkinsapi.build
import jenkinsapi.jenkins

#Required Environment variables example:
#JENKINS_URL=http://jenkinsserver/
#JOB_NAME=TEST_GT
#BUILD_NUMBER=8

jenkins_inst = None

def get_jenkins_inst():
    if jenkins_inst == None:
        jenkins_url = os.environ['JENKINS_URL']
        print("Connect to jenkins " + jenkins_url)
        jenkins_inst = jenkinsapi.jenkins.Jenkins(jenkins_url)
    return jenkins_inst

def get_jenkins_job():
    jenkins_inst = get_jenkins_inst()

    jenkins_job_name = os.environ['JOB_NAME']
    print("Get jenkins job " + jenkins_job_name)
    return jenkins_inst.get_job(jenkins_job_name)

def get_jenkins_user():
    jenkins_job = get_jenkins_job()

    jenkins_buildno = int(os.environ['BUILD_NUMBER'])
    print("Get jenkins job build " + str(jenkins_buildno))
    cur_build = jenkins_job.get_build(jenkins_buildno)

    return cur_build.get_actions()['causes'][0]['userId']