Conditional Aggregations with Variable Expressions in Azure DevOps Pipelines

8 August 2024

Using Conditional Aggregations with Variable Expressions in Azure DevOps Pipelines

Azure DevOps Pipelines provides a robust and flexible way to automate software builds, tests, and deployments. One of the key features that makes pipelines efficient is conditional aggregations, which allows you to perform calculations or aggregate data based on certain conditions. However, when dealing with variable expressions, things can get a bit tricky.
In this article, we will explore how to use conditional aggregations with variable expressions in Azure DevOps Pipelines to optimize your pipeline execution.

What are Conditional Aggregations?

Conditional aggregations in Azure DevOps Pipelines allow you to perform calculations or aggregate data based on certain conditions. This can be useful when you need to handle different scenarios or edge cases in your pipeline. For example, you might want to calculate the total cost of a deployment based on whether it’s happening during business hours or not.

Using Variable Expressions with Conditional Aggregations

To use variable expressions with conditional aggregations, you’ll first need to define a variable that will hold the expression. You can then use this variable in your aggregation calculation.
Here’s an example of how you might do this:

variables:
  businessHours: $[equals(steps.build.outputs.result, 'success')] ? true : false
stages:
- stage: deploy
  displayName: Deploy to production
  jobs:
  - job: deploy
    displayName: Deploy to prod
    steps:
    - task: powershell
      displayName: Calculate total cost
      inputs:
        targetType: 'inlineScript'
        script: |
          $totalCost = 0
          if ($businessHours)
          {
              $totalCost += 1000
          }
          else
          {
              $totalCost += 5000
          }
          Write-Output "Total cost: $($totalCost)"

In this example, we first define a variable businessHours that holds the result of a conditional expression. We then use this variable in our aggregation calculation to determine the total cost.

Conclusion

Conditional aggregations with variable expressions are a powerful tool in Azure DevOps Pipelines that can help you optimize your pipeline execution. By using these features, you can perform calculations or aggregate data based on certain conditions, making your pipelines more efficient and flexible. With this article, we hope to have provided you with a clear understanding of how to use conditional aggregations with variable expressions in Azure DevOps Pipelines.

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