How to Dynamically Pass Variables into a Groovy Script in Jenkins Pipeline Parameters

Learn how to access job-specific variables within a Groovy script in Jenkins Pipeline. This post explores a solution to dynamically pass environment variables, enhancing your Jenkins automation workflow.
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Unlocking the Power of Dynamic Variables in Jenkins Pipelines

In the world of continuous integration and deployment, Jenkins is a powerful tool. For many teams, writing and maintaining multiple Jenkinsfile configurations is a cumbersome task. This leads to the question: How can we dynamically pass variables into Groovy scripts executed in Jenkins pipeline parameters?

In this guide, we’ll delve into a structured solution that allows you to access environment variables, tailoring your Jenkins jobs efficiently without the chaos of multiple configurations.

The Challenge

Suppose you have keys in a Consul database structured as follows:

AAA/BBB/test-key containing values like '1,2,3'

AAA/CCC/test-key containing values like '4,5,6'

You want to maintain a shared Jenkinsfile across several jobs without hardcoding key URIs, which makes the workflow cumbersome and error-prone. You aim to access these keys based on the job name dynamically.

For example, here’s the working code you might typically use:

[[See Video to Reveal this Text or Code Snippet]]

However, attempts to integrate env.JOB_NAME directly into this URL often fall flat. But don't worry, there's a solution!

The Solution

Step-by-step Implementation

Access Thread Details: Capture the current thread's details to derive the job name.

Use Regular Expressions: Utilize regex to parse the thread's string representation and extract the job name.

Dynamic URL Construction: Construct the URL dynamically using the derived job name.

Here's the implementation:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Regular Expression Usage: This effectively extracts the job name from the current thread description.

Dynamic Key Retrieval: Constructs the URL by embedding the dynamically obtained jobName into the endpoint.

Conclusion

By following this approach, you can successfully access environment variables inside your choice parameters when defining them with Groovy scripts in Jenkins. Not only does this promote code reuse through a shared Jenkinsfile, but it also enhances the overall maintainability of your CI/CD pipeline.

With this template, you're equipped to streamline your Jenkins jobs while maintaining flexibility and ease of management. Happy coding!