Adding Global Password to Jenkins with init.groovy - jenkins

Question

How can I add a global passwords to Jenkins through the init.groovy that runs at startup?
To be clear, in the Manage Jenkins -> Configure Jenkins page, there is a section titled "Global Passwords". I would like to add entries in that section via Groovy code during the startup of Jenkins.
I am trying to provision my jenkins environment through groovy code by using the init.groovy. I need to add global passwords through the EnvInject plugin. I can successfully add path to a file for the same plugin using this code:
def instance = Jenkins.getInstance()
DescribableList<NodeProperty<?>, NodePropertyDescriptor> globalNodeProperties =
instance.getGlobalNodeProperties();
globalNodeProperties.add(
new EnvInjectNodeProperty(false, "/var/lib/jenkins/secret.properties")
);
However, I am failing to understand the mechanics needed to programmatically add global passwords.

Answer 1

Here is the code example that should work. It seems that save() method also adds it to GlobalNodeProperties, so you don't have to add to that collection manually.
import jenkins.model.*
import hudson.util.*
import hudson.slaves.NodeProperty
import hudson.slaves.NodePropertyDescriptor
import org.jenkinsci.plugins.envinject.*
def instance = Jenkins.getInstance()
DescribableList<NodeProperty<?>, NodePropertyDescriptor> globalNodeProperties
= instance.getGlobalNodeProperties();
envInjectNodeProperty= new EnvInjectNodeProperty(false, "/var/lib/jenkins/secret.properties"
propDescriptor = envInjectNodeProperty.getDescriptor()
//password entry
def passEntry = new EnvInjectGlobalPasswordEntry("some_username", "password")
//password entries list, add you global password here
List<EnvInjectGlobalPasswordEntry> envInjectGlobalPasswordEntriesList= [passEntry];
propDescriptor.envInjectGlobalPasswordEntries =
envInjectGlobalPasswordEntriesList.toArray(
new EnvInjectGlobalPasswordEntry[envInjectGlobalPasswordEntriesList.size()]
);
propDescriptor.save();

Answer 2

https://github.com/jenkinsci/envinject-plugin/tree/master/src/main/java/org/jenkinsci/plugins/envinject
I did not try this plugin, but there is a class : EnvInjectGlobalPasswordEntry
i guess it could be like this:
globalNodeProperties.add(
new EnvInjectGlobalPasswordEntry("pass-name", "the-password")
);