Resolving Jenkins Declarative Pipeline git checkout Step Issues

Описание: Discover the solution to Jenkins Declarative Pipeline git checkout step failures. Learn about plugin dependencies and how a server restart can solve your problems.
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This video is based on the question https://stackoverflow.com/q/66097352/ asked by the user 'nashter' ( https://stackoverflow.com/u/3002377/ ) and on the answer https://stackoverflow.com/a/66097941/ provided by the user 'nashter' ( https://stackoverflow.com/u/3002377/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Jenkins Declarative Pipeline: Fixing the git checkout Step

When working with Jenkins, there can be instances where a well-structured pipeline fails at unexpected stages. One common frustration involves the git checkout step in a Declarative Pipeline. This post highlights a specific issue related to plugin dependencies that can lead to errors and provides a clear, step-by-step solution.

The Problem

In our scenario, the Jenkins pipeline encountered a failure while trying to perform a git checkout. Here's a snippet from the pipeline code that was executed:

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

Upon execution, an error was thrown indicating problems with the parameters used in the git command:

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

This was unexpected as the command syntax seemed correct at first glance. So, what was going wrong?

Investigating the Root Cause

The crux of the issue lay in the Jenkins setup, particularly concerning plugin dependencies. In this case, the workflow-aggregator plugin (version 2.6) was in use, which has a dependency on the git-client plugin. Here's how the issue unfolded:

Manual Installation: The git plugin was manually installed after the Jenkins server was started along with the workflow-aggregator plugin.

Server Restart: The Jenkins server was never restarted post the manual installation of the git plugin, which created a mismatch in what the pipeline was able to recognize.

Understanding the Plugins

workflow-aggregator: A collection of plugins that enhance Jenkins workflows. The installation of this plugin can sometimes lead to additional dependencies that must be fulfilled.

git Plugin: Provides the capability to perform git operations in Jenkins pipelines. However, without proper initialization and registration through a server restart, its features might not be recognized.

The Solution

To resolve the git checkout step failure, follow these straightforward steps:

Restart the Jenkins Server: This is crucial after installing or updating any plugins. A restart ensures that Jenkins initializes all plugins correctly and recognizes their dependencies.

Verify Plugin Installation: After the restart, confirm that both the git plugin and git-client are installed and updated to their latest stable versions.

Test the Pipeline Again: Once the server is back online, re-run the pipeline to check if the issue with the git checkout step has been resolved.

Conclusion

Pipeline issues can often stem from overlooked details such as plugin dependencies and server functionality. In this case, a simple server restart made all the difference in getting the git checkout step to work effectively. Remembering to restart Jenkins when making significant changes can save you time and frustration in the long run.

If you encounter similar issues in the future, consider this guide and the steps outlined here to assist you in troubleshooting effectively.

Happy Jenkins-ing!