Скачать или смотреть Solving the Failed to Get the Output of Jenkins Pipeline Error in Declarative Pipeline

Discover how to resolve the frustrating error of failing to capture the output of a Jenkins pipeline `sh` step in a declarative pipeline format. Follow our step-by-step guidelines to ensure smooth execution.
---
This video is based on the question https://stackoverflow.com/q/62548359/ asked by the user 'Tim' ( https://stackoverflow.com/u/1273394/ ) and on the answer https://stackoverflow.com/a/62553952/ provided by the user 'Matthew Schuchard' ( https://stackoverflow.com/u/5343387/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Failed to get the output of jenkins pipeline sh step result inside Declarative Pipeline

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Solving the Failed to Get the Output of Jenkins Pipeline Error in Declarative Pipeline

When working with Jenkins, developers might encounter a frustrating roadblock while trying to capture the output of shell commands executed during a pipeline. Specifically, you may receive a compilation error like this when attempting to do so within a declarative pipeline:

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

In this guide, we will break down the issue and provide a clear solution to successfully retrieve shell command outputs in your Jenkins declarative pipelines.

Understanding the Problem

In your Jenkins pipeline, you might attempt to capture the output of a shell command with a line of code like this:

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

However, placing this assignment directly inside the steps block of a declarative pipeline will lead to a compilation error. The main reason behind this is:

Declarative vs. Scripted Pipeline: In a declarative pipeline, certain language features, including variable assignments, need specific handling, leading to unexpected errors if not encapsulated properly.

The Solution

To effectively capture the output of the shell command while maintaining the structure of a declarative pipeline, you need to wrap the sh command inside a script block. Let’s look at how to implement this step by step.

Step-by-Step Implementation

Define Your Pipeline: Start by establishing your pipeline framework.

Use the script Block: Encapsulate your shell command inside a script block. This allows you to use robust Groovy features inside the declarative format and avoids the error previously encountered.

Here is the corrected version of your pipeline script:

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

Explanation of the Code

Pipeline Declaration: pipeline { ... } indicates that you're working in a Jenkins pipeline context.

Stage Management: The stage('Hello') { ... } section converts your operations into a dedicated node, making it visually and functionally segregated from other stages.

Step Execution:

echo 'Hello World' simply prints a welcome message to the console.

The script { ... } block allows for more complex operations utilizing Groovy syntax.

The sh command executes the shell command specified, with returnStdout: true indicating we want the output of the command captured in the variable result.

echo result prints the captured output to the Jenkins console.

Conclusion

By using a script block, you can effectively capture outputs from shell commands in a Jenkins declarative pipeline without facing syntax errors. Following this structure helps maintain the clean, readable format that declarative pipelines offer while leveraging more complex Groovy functions when necessary.

Remember, the separation of concerns and clear organizational structure are key to managing Jenkins pipelines effectively. So, whenever you encounter similar issues, consider wrapping your script executions within the script block for a seamless experience.

With this understanding in hand, you can confidently modify your Jenkins pipelines to utilize shell commands as needed!