Parameterized build driven by Jenkinsfile

[Craig Barr]

In Jenkins you can select "This project is parameterized" and add parameters. My question is simple:

Can this parameter metadata be populated by an alternative version-controlled source?

For example, can I define parameter definitions in my Jenkinsfile so that when I click Build Now it will populate the parameters from this source?

If this is not possible, are they any other suggestions for addressing such a requirement?

Thanks!

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[Jacob Larsen]

Yes, kind of...

The parameters are hidden in the "properties" structure. They will be applied to the job when it runs, meaning that the first run will not have these parameters defined. If you make your Jenkinsfile robust for undefined parameters, it should be doable, just remember that they will apply to the second build.

/Jacob

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[Alex Marcon]

That's right... to define, it is something like:

    parameters {
        string(name: 'bld', defaultValue: 'full', description: '')
        string(name: 'branch', defaultValue: 'dev', description: '')
    }

you may load some properties from a file and use those variables for defaultValue...

AM

[Craig Barr]

Thanks Jacob and Alex!

Which version of Jenkins does this work for you on?

I've tried with the following Jenkinsfile on 2.46.1 but no matter how many times I ran, the parameters never showed up in the console.

parameters {

   string(name: 'bld', defaultValue: 'full', description: '')

   string(name: 'branch', defaultValue: 'dev', description: '')

}

node {

   if (getBinding().hasVariable("bld")) {

      echo "SET"

   } else {

      echo "NOTSET"

[Jacob Larsen]

Try this:

properties([
    parameters([
        string(name: 'bld', defaultValue: 'full', description: ''),

        string(name: 'branch', defaultValue: 'dev', description: '')

    ])
])

/Jacob

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[R. Tyler Croy]

(replies inline)

On Wed, 02 Aug 2017, Craig Barr wrote:

> In Jenkins you can select "This project is parameterized" and add
> parameters. My question is simple:
> Can this parameter metadata be populated by an alternative
> version-controlled source?
>
> For example, can I define parameter definitions in my Jenkinsfile so that
> when I click Build Now it will populate the parameters from this source?
> If this is not possible, are they any other suggestions for addressing such
> a requirement?

My pal Liam created a screencast on this topic recently:
https://www.youtube.com/watch?v=5_tvlaIeQUQ&feature=youtu.be

See also: https://jenkins.io/doc/book/pipeline/jenkinsfile/#parameters


- R. Tyler Croy

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[Craig Barr]

Thanks Jacob. That worked exactly as I would expect!

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