Microsoft DevOps Engineer Expert AZ-400 Practice Question

You are standardizing your organization's Azure Pipelines by extracting a frequently used job into a reusable YAML template named build-dotnet.yml. The job relies on values that different teams keep in their own variable groups. You want the calling pipeline to decide at queue time which variable group the template should import, without having to modify the template itself for every team.

Which approach should you implement inside build-dotnet.yml so that the same template can be reused with any variable group name chosen by the caller?

Read the group name from a secure environment variable that each team sets on the agent machine.
Declare a string parameter such as parameters: - name: varGroupName and import the group with variables:
- group: ${{ parameters.varGroupName }}
Reference the variable group name through a runtime variable like $(varGroupName) inside the variables section.
Convert the job into a task group instead of a YAML template and set the variable group as a task group parameter.

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Answer Description

A template can expose a string parameter that the consuming pipeline sets to the name of its preferred variable group. Inside the template you reference that parameter in the variables section by using compile-time expression syntax. When the caller provides a different value for that parameter, the variable-group reference is replaced at template expansion, allowing the same template to work with any variable group. Referencing the variable group through a runtime variable such as $(varGroup) or environment variables will not work because the group name must be resolved before the pipeline is run. Task group parameters and predefined system variables cannot be used to inject an arbitrary variable-group name.

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