Okay, mere moments after I posted this, user @OltzU gave me a solution in
IRC.
I needed to be using instance.nodeProperties.add(). So this code works
import jenkins.model.Jenkins
import hudson.slaves.EnvironmentVariablesNodeProperty
import hudson.slaves.NodeProperty
def instance = Jenkins.instance
def evnp = new EnvironmentVariablesNodeProperty();
for (prop in evnp) {
prop.envVars.put("MY_OTHER_NAME", "my_other_value")
}
instance.nodeProperties.add(evnp)
instance.save()
Perfect!
On Tuesday, 3 May 2016 16:02:15 UTC+1, Barry Laffoy wrote:
>
> Hi
>
> As in this SO question, http://stackoverflow.com/q/34186806/1506521, I am
> trying to set environment variables on my Jenkins nodes (master + slaves)
> automatically. i.e. via a script, without having to go through the web
> front end.
>
> The code given in the answer only works if the Node Properties Environment
> Variables checkbox in the web interface has already been ticked.
>
> import jenkins.model.*
> import hudson.model.*
> import hudson.slaves.*
>
> jenkins = Jenkins.instance
> node = jenkins.getNode('master')
> props =
> node.nodeProperties.getAll(hudson.slaves.EnvironmentVariablesNodeProperty.class)
>
> for (prop in props) {
> prop.envVars.put("MY_OTHER_NAME", "my_other_value")
> }
>
> jenkins.save()
>
>
> I can't seem to find a way to enable the Node Properties Environment
> Variables checkbox without doing so manually through the web interface.
>
> I can create a new EnvironmentVariablesNodeProperty class and insert my
> env vars into this, but then I cannot apply this to the jenkins instance:
>
> import jenkins.model.Jenkins
> import hudson.slaves.EnvironmentVariablesNodeProperty
> import hudson.slaves.NodeProperty
>
> def instance = Jenkins.instance
> def evnp = new EnvironmentVariablesNodeProperty();
>
> for (prop in evnp) {
> prop.envVars.put("MY_OTHER_NAME", "my_other_value")
> }
>
> instance.nodeProperties = evnp
>
> instance.save()
>
> This results in the error message
>
> groovy.lang.ReadOnlyPropertyException: Cannot set readonly property:
>> nodeProperties for class: hudson.model.Hudson
>
>
> In jenkins.model.Jenkins, nodeProperties is set to private, so I believe
> that's why I can't overwrite it. However, I don't see any interface to
> update it.
>
> Is there some clever groovy metaprogramming trick that might allow me to
> force-write a private field?
>
> Alternatively, it seems possible to create a new DumbSlave via groovy with
> this code
>
> 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))
>
> However, I don't see how this could be used to set an environment variable
> on the existing master node. It doesn't seem possible to overwrite that
> node with a new DumbSlave. Is there some way of specifying a list of
> environment variables for the master node when first deploying Jenkins?
>
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