seecoder-build-jenkins/config/set-global-environment.groovy

#!groovy
import groovy.json.JsonSlurper
import jenkins.model.*
import hudson.security.*
import hudson.model.*
import hudson.slaves.*

def instance = Jenkins.getInstance()

def parser = new JsonSlurper()
def config = parser.parseText(new File('/var/jenkins_home/config.json').text)

globalNodeProperties  = instance.getGlobalNodeProperties()
envVarsNodePropertyList = globalNodeProperties.getAll(EnvironmentVariablesNodeProperty.class)
newEnvVarsNodeProperty = null
envVars = null

if ( envVarsNodePropertyList == null || envVarsNodePropertyList.size() == 0 ) {
  newEnvVarsNodeProperty = new EnvironmentVariablesNodeProperty();
  globalNodeProperties.add(newEnvVarsNodeProperty)
  envVars = newEnvVarsNodeProperty.getEnvVars()
} else {
  envVars = envVarsNodePropertyList.get(0).getEnvVars()
}

for (prop in config.global_env) {
  envVars.put(prop.keySet()[0], prop[prop.keySet()[0]])
}

println "--> adding global envs"

instance.save()