Скачать или смотреть How to Pass a Variable from Remote SSH Connection to Other Stages in Groovy Script

Learn how to effectively pass variables in your Jenkins pipeline Groovy script, especially when retrieving data via remote SSH connections.
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This video is based on the question https://stackoverflow.com/q/63730906/ asked by the user 'MaryJoAnneBeth' ( https://stackoverflow.com/u/14217226/ ) and on the answer https://stackoverflow.com/a/63801625/ provided by the user 'Mike' ( https://stackoverflow.com/u/8168090/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Pass a Variable from Remote SSH Connection to Other Stages in Groovy Script

Are you finding it challenging to pass a variable between stages in your Jenkins pipeline Groovy script, especially when that variable is sourced from a remote SSH connection? You’re not alone! This guide will guide you through the problem and present a clear, structured solution.

The Problem

When working with Jenkins pipelines, it’s common to run into situations where you need to utilize variables across different stages. For instance, you might want to fetch a value from a file on a remote server using SSH and then pass that value to a subsequent stage.

In this specific situation, you’re attempting to read a number from a remote file and then pass this number (4 in the example) to a variable a_var that you intend to use later.

Your Initial Attempt

Your initial script looked something like this:

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

However, the output in stage two was null, which was not what you expected.

Solution: Updated Code Snippet

After reviewing the initial attempt and considering feedback, here's the updated approach to successfully implement the variable passing. The key change is ensuring that the output of the SSH command is captured correctly and stored in the environment variable.

The Correct Code

Here's a simplified version of your pipeline script that will work as intended:

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

Explanation of Changes

Using returnStdout: true: This is crucial as it allows the output of the SSH command to be captured as a string.

Trimming the Output: The trim() method is used to remove any unnecessary whitespace or new line characters that may be included in the command’s output.

Direct Assignment: The variable env.a_var is updated directly with the captured value from the SSH command.

Conclusion

By implementing the changes outlined above, you should be able to pass a variable obtained from a remote SSH connection seamlessly between stages in your Jenkins pipeline. This streamlined approach not only enhances the functionality of your script but also simplifies your coding process.

If you have any further questions or need clarification on any points, feel free to reach out in the comments below. Happy scripting!