CODEWITHSUNDEEP
azure-pipelines
Richard Barraclough
Richard Barraclough

Reputation: 2994

Azure pipeline conditionally set pool

name: $(Build.BuildId)-${{ variables['Build.SourceBranchName']}}

pool:
  ${{ if eq(variables['Build.SourceBranchName'], 'merge') }}:
    name: 'Default' # run on rwb's machine (plus whatever else is in the default pool).
  ${{ if ne(variables['Build.SourceBranchName'], 'merge') }}:
    vmImage: 'windows-latest' # run on the MS hosted pool (limited to 1800 hours per month).

variables:
  -name: isHosted
  ${{ if eq(variables['Build.SourceBranchName'], 'merge') }}:
    value: false
  ${{ if ne(variables['Build.SourceBranchName'], 'merge') }}:
    value: true

but

/azure-pipelines.yml (Line: 4, Col: 3): A template expression is not allowed in this context
/azure-pipelines.yml (Line: 6, Col: 3): A template expression is not allowed in this context

It's also a mess having to repeat the conditions.

Can this be made to work?

Update

Tidied this up. Had to add a job, irritatingly. The variable seems to be getting set correctly, but the job always runs on the Hosted Agent; the condition ${{ if eq(variables.useSelfHostedAgent, 'True') }} is ignored but the condition ${{ if eq(variables['Build.SourceBranchName'], 'merge') }} works! (This makes no sense -- which seems to be normal for Azure pipeline YML.)

name: $(Build.BuildId)-${{ variables['Build.SourceBranchName']}}

variables:
  useSelfHostedAgent: $[eq(variables['Build.SourceBranchName'], 'merge')]

trigger:
- '*'

###############################################################################

resources:
  repositories:
    - repository: AzurePipelineTemplates
      type: git
      name: AzurePipelineTemplates/AzurePipelineTemplates

jobs:
- job: Product
  pool:
    #${{ if eq(variables.useSelfHostedAgent, 'True') }}: # is ignored
    ${{ if eq(variables['Build.SourceBranchName'], 'merge') }}:
      name: 'Default' # run on rwb's machine (plus whatever else is in the default pool).
    ${{ else }}:
      vmImage: 'windows-latest' # run on the MS hosted pool (limited to 1800 hours per month).

  steps:
  - task: PowerShell@2
    displayName: Condition
    condition: eq(variables.useSelfHostedAgent, 'True')
    inputs:
      targetType: 'inline'
      script: |
          Write-Host "Now is the time for all good men to come to the aid of the party."

  - task: PowerShell@2
    displayName: Get pool name
    inputs:
      targetType: 'inline'
      script: |
          Write-Host "Agent.Name is $(Agent.Name)"
          Write-Host "useSelfHostedAgent is $(useSelfHostedAgent)"
      
  - template: BuildTestPackPublish.yml@AzurePipelineTemplates
    parameters:
      projectsToTest: '**/Company.Product.Tests.csproj'# Not SeleniumTests.

Upvotes: 0

Views: 873

Answers (3)

Richard Barraclough
Richard Barraclough

Reputation: 2994

jobs:
- job: ${{ parameters.jobName }}
  pool:
    ${{ if or(eq(variables['Build.SourceBranchName'], 'master'), eq(variables['Build.SourceBranchName'], 'main'), false) }}:
      vmImage: 'windows-latest' # Always build master on the MS hosted pool (limited to 1800 hours per month).
    ${{ else }}:
      name: 'Default' 
      ${{ if or(and(parameters.symbols, ne(variables['Build.SourceBranchName'], 'merge')), parameters.migrations) }}:
        demands: 
        - Agent.OS -equals Windows_NT # PushSymbols task in pack.yml only works on Windows.

It is impossible to use Build.BuildId in the ${{ if.

Upvotes: 0

Dou Xu-MSFT
Dou Xu-MSFT

Reputation: 3406

From the warning information, it seems like it isn't allowed if the pool definition is higher up(e.g. at pipeline level) but it works fine if the pool definition is inside a job definition.

You can use else expression to replace ${{ if ne(variables['Build.SourceBranchName'], 'merge') }} that keeps your code simple.

For example:

jobs: 
- job: example
  pool:
      ${{ if eq(variables['Build.SourceBranchName'], 'merge') }}:
        name:  'Default' 
      ${{ else }}:
        vmImage: 'windows-latest'

BTW you can use Use parameters in pipelines to select which pool you want to run.

Please refer to doc:Use parameters in pipelines

UPDATE

the condition ${{ if eq(variables.useSelfHostedAgent, 'True') }} is ignored

Because you define the variable useSelfHostedAgent as runtime expressions,runtime expressions can be used in variables and conditions. It can't be recognized in if expression. Please refer to doc:Specify conditions

Upvotes: 1

Daniel Mann
Daniel Mann

Reputation: 59065

You have a syntax error.

-name: isHosted should be - name: isHosted

Upvotes: 1

Related Questions