Jenkins Slave - How to add or update ENVIRONMENT variables

Question

Has anyone tried a way to add or update an ENVIRONMENT variable in a Jenkins slave\'s configuration using Jenkins Rest/API or any other way.

Using Jenkins Swarm plugin,

Answer 1

When creating the node, you can pass the variables as the last parameter:

import jenkins.model.*
import hudson.model.*
import hudson.slaves.*

entry = new EnvironmentVariablesNodeProperty(new EnvironmentVariablesNodeProperty.Entry("MY_NAME", "my_value"))

list = new LinkedList()
list.add(entry)

Jenkins.instance.addNode(new DumbSlave("test-slave", "test slave description", "C:\\Jenkins", "1", Node.Mode.NORMAL, "test-slave-label", new JNLPLauncher(), new RetentionStrategy.Always(), list))

From DumbSlave here and EnvironmentVariablesNodeProperty here.

To add variables to an existing slave, we can use the following:

import jenkins.model.*
import hudson.model.*
import hudson.slaves.*

jenkins = Jenkins.instance
node = jenkins.getNode('test-slave')

props = node.nodeProperties.getAll(hudson.slaves.EnvironmentVariablesNodeProperty.class)
for (prop in props) {
  prop.envVars.put("MY_OTHER_NAME", "my_other_value")
}
jenkins.save()