Скачать или смотреть How to Retrieve All Lines from a text Parameter in a Jenkins Declarative Pipeline

Learn how to effectively access all lines from a `text` parameter in your Jenkins declarative pipeline, ensuring all values are captured and printed correctly.
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How to Retrieve All Lines from a text Parameter in a Jenkins Declarative Pipeline

Jenkins pipelines are a powerful tool for automating your build processes, but they can sometimes be tricky to navigate. One common issue occurs when attempting to retrieve values from a text parameter. If you’re using a text parameter in your Jenkins file and it seems like only the first line is being recognized, you’re not alone. Many users encounter this problem, especially when working with lists formatted as multiple lines.

In this guide, we'll address the question: How to access values of all lines from a text parameter within a Jenkins pipeline? We will explore a step-by-step solution to ensure that all lines entered in your text parameter are captured and utilized effectively in your pipeline scripts.

Overview of the Problem

When you define a text parameter in your Jenkinsfile, you might expect to be able to use multiple lines of input. For instance, you might have a list of filenames entered in the following format:

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

However, you might find that when you try to print the environment variable, only the first line appears:

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

This indicates that the method used to retrieve the text parameter needs some adjustments. Let’s dive into how to modify your Jenkinsfile to capture all lines.

Solution: Updating Your Jenkinsfile

To access all lines from a text parameter, you can modify your Jenkinsfile to properly handle line breaks. Here’s a clear breakdown of the solution.

Step 1: Define the text Parameter

You already have a proper definition for the text parameter in your Jenkinsfile. If you haven’t set it up yet, here’s how it looks:

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

Step 2: Split and Join Lines in a Script Block

Instead of directly printing the environment variable, you will want to capture all the lines as a single string that can then be used in your script. This involves splitting the input using a regular expression that matches line breaks and joining them back into a single string (if necessary). Here is the updated code for your pipeline:

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

Key Points to Note

Splitting with Regular Expressions: The expression "\r?\n" allows you to split on both Windows-style (\r\n) and Unix-style (\n) line breaks.

Joining with Spaces: By joining the result with spaces, we create a single line string that can be used easily in command-line operations.

Using sh Command: The sh command is invoked to execute the shell command that utilizes the constructed variable.

Conclusion

With these modifications, you can now effectively retrieve and use all lines from a text parameter in your Jenkins declarative pipeline. This solution ensures that every line you input is processed properly, allowing your builds to succeed without missing any essential filenames or parameters.

Feel free to try this updated approach in your Jenkins setup, and you should experience an improved handling of multiple lines within your pipeline jobs.

If you have any questions or need further assistance, feel free to reach out in the comments below!