Building CI/CD Systems Using Tekton

Chapter 8: Adding when Expressions

In the pipelines you've built so far, Tekton executed tasks in a specified order as long as the previous one was successful. As you work your way toward more advanced CI/CD Tekton pipelines, you will encounter cases where some of your tasks will need to be guarded. A typical use case would be to prevent a deployment task from being executed if the branch on which a commit happened is anything but main.

When expressions can be added to Tekton tasks to add a condition on when to execute a specific task. In this chapter, you will learn more about building your when expressions and how to add them to a task to block their execution.

Finally, to decide whether a task should be executed or not, you will see how ...