Variables which value is a variable name in yaml

Question

I have following tasks in a pipeline (Azure DevOps). First task read a secret from a KeyVault using a variable $(mySecretName) which value is secret-name. Second task needs to pass the value of the read secret to a ARM:

- task: AzureKeyVault@2
  displayName: 'Read secret'
  inputs:
     azureSubscription: $(mySubscription)
     KeyVaultName: $(myKeyVault)
     SecretsFilter: $(mySecretName)
     RunAsPreJob: false

- task: AzureResourceGroupDeployment@3
  displayName: 'Use secret value'
  inputs:
     resourceGroupName: $(myResourceGroup)
     location: $(myLocation)
     azureResourceManagerConnection: $(mySubscription)
     templateLocation: 'Linked artifact'
     csmFile: '$(Pipeline.Workspace)/cd-template.json'
     overrideParameters: >
        -secretValue "$($(mySecretName))"
     deploymentMode: 'Incremental'

In line -secretValue "$($(mySecretName))" I'm trying to resolve in this way but apparently it does not work: $(mySecretName) -> $(secret-name) -> secret value. If I use $(secret-name) it will work, but I need to use $(mySecretName) because the name will change depending on the environment.

Is there any solution that allows me to get the value of a variable which name is the value of another variable?

Answer 1

From your YAML sample, you are using nested variables $($(mySecretName)). It is not yet supported in the pipelines.

To achieve your requirement, you can use the Variable Set task from extension: Variable Toolbox.

You can add the Variable Set task before the AzureResourceGroupDeployment task.

For example:

steps
- task: VariableSetTask@2
  displayName: 'Set variable: kevin to: ''$($(test))'''
  inputs:
    variableName: NewVariable
    Value: '$($(mySecretName))'

- task: AzureResourceGroupDeployment@3
  displayName: 'Use secret value'
  inputs:
     resourceGroupName: $(myResourceGroup)
     location: $(myLocation)
     azureResourceManagerConnection: $(mySubscription)
     templateLocation: 'Linked artifact'
     csmFile: '$(Pipeline.Workspace)/cd-template.json'
     overrideParameters: >
        -secretValue "$(NewVariable)"
     deploymentMode: 'Incremental'