[Newbie] Jenkins.instance vs Hudson.instance?

[Calvin]

I recently watched Sam's video guides on how to modify Jenkins settings via Groovy scripts.

I'm trying to modify the default shell programmatically and running into difficulties.

On a different Jenkins instance, I see that hudson.tasks.Shell.xml contains this config

<hudson.tasks.Shell_-DescriptorImpl>

  <shell>bash</shell>

</hudson.tasks.Shell_-DescriptorImpl>

How do I access that field using Groovy?

I found hudson.tasks.Shell.DescriptorImpl.setShell(String shell) doc.

When I tried to access hudson.tasks via Hudson.instance.tasks.dump() I got this error

groovy.lang.MissingPropertyException: No such property: tasks for class: hudson.model.Hudson

Possible solutions: class

1. Jenkins.instance vs Hudson.instance? Which contains what and why?

2. How do I access the setShell() method?

Thanks for your help in advance

[Oleg Nenashev]

Hi Calvin,

Jenkins.instance vs Hudson.instance? Which contains what and why?

• There is no real difference. "Hudson.getInstance()" xists for compatibility reasons but returns the same object

Hudson.instance.tasks.dump()

As designed, there is no "tasks" in the Jenkins object: https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/jenkins/model/Jenkins.java . Likely you got confused by package names.

How do I access the setShell() method?

It should be something like that (untested):
Jenkins.instance.getDescriptor(hudson.tasks.Shell.class).setShell()

 

Hopefully it helps,
Oleg

[Calvin]

Thank you Oleg. I'll dig more into Descriptor.java to get a better understanding.