Скачать или смотреть How to Pass Variables to the Template Parameter in Azure YAML

Discover a simple solution to pass variables to the template parameter in Azure YAML pipelines effectively.
---
This video is based on the question https://stackoverflow.com/q/68729301/ asked by the user 'JCDani' ( https://stackoverflow.com/u/9748301/ ) and on the answer https://stackoverflow.com/a/68729470/ provided by the user 'Daniel Mann' ( https://stackoverflow.com/u/781754/ ) 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: How to pass variables to the template parameter in azure yaml?

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.
---
How to Pass Variables to the Template Parameter in Azure YAML

In today’s fast-paced DevOps world, maintaining an efficient and reusable pipeline is critical for success. For those using Azure DevOps, the ability to pass variables effectively into templates can streamline your CI/CD process. However, many users encounter challenges when trying to make this work seamlessly. In this guide, we'll delve into a common issue surrounding passing variables to template parameters in Azure YAML pipelines and provide a detailed solution to ensure your templates are both flexible and reusable.

Understanding the Problem

You may have a template file intended to build images for deployment, like the one below:

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

You also have a variables file that defines multiple paths:

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

In your main pipeline YAML, you correctly reference the template and pass the variable for PATH as shown here:

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

The above code works fine for PATH, but trouble arises when you try to use ${{ variables.PATH1 }} or ${{ variables.PATH2 }} and receive an unexpected output like this:

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

This output indicates that Azure is not able to replace the variables as expected.

The Solution

The key to resolving this issue lies in incorporating a parameters block within your template file. Instead of attempting to directly reference the variable in the script, you'll define a parameters section to declare what values your template should expect. Here’s how to set it up:

Modify Your Template File

Make a small but crucial change to your dockerbuild.yml:

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

Explanation of Changes

Parameters Block: By introducing the parameters block at the beginning of the template, you define what the template expects. In this case, we're expecting a string variable for PATH.

Using Parameters: Inside the script, you're no longer using the $(), which attempts to evaluate the variable availability on the environment level. Instead, you make use of ${{ parameters.PATH }}, which correctly evaluates to the passed-in value.

How to Use the Template

Now, you can call your template multiple times within the same pipeline, each time passing different paths, like so:

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

With these adjustments, your pipeline should operate smoothly, allowing you to reuse the template efficiently with various parameter values.

Conclusion

Passing variables to template parameters in Azure YAML can be a bit tricky, but with the right understanding and small code adjustments, it becomes straightforward. By defining a parameters block in your template, you can maximize its potential and simplify your CI/CD workflows. Don’t hesitate to leverage this method in your Azure DevOps pipelines for a more dynamic and reusable setup!

Feel free to share your experiences or ask questions in the comments below!