import hudson.slaves.EnvironmentVariablesNodeProperty
import jenkins.model.Jenkins

void setGlobalVariables(versionPrefix){
    instance = Jenkins.getInstance()
    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()
    }

    envVars.put("VERSION_PREFIX", versionPrefix);
    envVars.put("BUILD_NUMBER", Jenkins.instance.getItemByFullName("BPM.Common").getNextBuildNumber());

    instance.save()
}

setGlobalVariables("1.0");