Azure Devops Pipeline for Deploying Powershell Azure Functions via Terraform

azure-pipelines.yml

variables:
  #Specified which branch that terraform apply and azure function deploy will run
  deployBranch: 'refs/heads/master'

jobs:
- job: AzureFunction
  displayName: Prepare Azure Function Package
  pool:
    vmImage: 'vs2017-win2016'
  steps:
    - checkout: self
      fetchDepth: 1
    #There is a bug where first run has a 10 second delay. This is done just so that other task times are reported correctly.
    - pwsh: "echo Initialized"
      displayName: 'Initialize Powershell Core'

    - pwsh: |
        Install-Module Pester -Scope CurrentUser -force
        Import-Module Pester
        Invoke-Pester -OutputFormat NUnitXML -OutputFile $(Build.StagingDirectory)/TestResults-Pester.XML #-CodeCoverageOutputFileFormat JaCoCo -CodeCoverageOutputFile $(Build.ArtifactStagingDirectory)/CodeCoverage-Pester.XML -CodeCoverage (Get-ChildItem run.ps1 -Recurse)
      displayName: Run Pester Tests

    - task: PublishTestResults@2
      displayName: 'Capture Pester Test Results'
      inputs:
        testRunner: NUnit
        testResultsFiles: $(Build.StagingDirectory)/TestResults-Pester.XML
        testRunTitle: Pester

    # - task: PublishCodeCoverageResults@1
    #   inputs:
    #     codeCoverageTool: 'JaCoCo'
    #     summaryFileLocation: $(Build.ArtifactStagingDirectory)/CodeCoverage-Pester.XML

    - task: CopyFiles@2
      displayName: 'Copy Files to Staging'
      inputs:
        Contents: |
          **/*
          !local.settings.json
          !.gitignore
          !.funcignore
          !profile.ps1
          !requirements.psd1
          !.git/**/*
          !.vscode/**/*
          !.azurefunctions/**/*
          !**/Tests/**/*
          !**/
        TargetFolder: '$(Build.StagingDirectory)'
        
    - task: PublishPipelineArtifact@0
      displayName: 'Publish Artifact: AzureFunctionPackage'
      inputs:
        targetPath: '$(Build.StagingDirectory)'
        ArtifactName: AzureFunctionPackage

- job: Terraform
  displayName: Run Terraform
  dependsOn: AzureFunction
  pool:
    vmImage: 'vs2017-win2016'
  steps:
    - checkout: self
      fetchDepth: 1
    #There is a bug where first run has a 10 second delay. This is done just so that other task times are reported correctly.
    - pwsh: "echo Initialized"
      displayName: 'Initialize Powershell Core'
    
    #Enabled when Debugging
    - pwsh: 'dir env: | ft | out-string;get-variable | ft | out-string'
      displayName: DEBUG Show all variables
      enabled: "false"

    - pwsh: |
        [String[]]$credfile = 'credentials "app.terraform.io" {'
        $credFile += "  token = `"$($ENV:TFE_TEAM_TOKEN)`""
        $credFile += '}'
        [IO.File]::WriteAllLines("$ENV:APPDATA\terraform.rc",$credFile,[Text.UTF8Encoding]::New($false))
      displayName: Fetch Terraform Enterprise Team Token
  #env:
  #  TFE_TEAM_TOKEN: $(TFE_TEAM_TOKEN)

# - powershell: gc -raw $ENV:APPDATA\terraform.rc; ($ENV:TFE_TEAM_TOKEN).SubString(0,4)
#   displayName: DEBUG-Show Backend TFE Token

    - pwsh: .\Tools\Install-Terraform.ps1
      displayName: Install Terraform
      timeoutInMinutes: 1

    - pwsh: .\terraform.exe init --input=false
      displayName: Run Terraform Init
      timeoutInMinutes: 1

    - pwsh: .\terraform.exe plan --input=false --out=$(Build.StagingDirectory)/adslusprtgfunctions.tfplan
      displayName: Run Terraform Plan
      condition: and(succeeded(), ne(variables['Build.SourceBranch'], variables['DeployBranch']))

    #TODO: Show Plan as a PR Status

    - pwsh: .\terraform.exe apply --input=false --auto-approve
      displayName: Run Terraform Apply
      condition: and(succeeded(), eq(variables['Build.SourceBranch'], variables['DeployBranch']))

    - pwsh: |
        $matrix = @{}
        $tfoutputjson = & .\terraform.exe output -json | ConvertFrom-Json
        $tfoutputjson.azurerm_function_app_name.value.foreach{
          $matrix.$PSItem = @{}
          $matrix.$PSItem.FunctionAppName = $PSItem
        }
        $matrix = $matrix | ConvertTo-Json -Compress
        $matrix
        echo "##vso[task.setVariable variable=matrix;isOutput=true]$matrix"
      displayName: Generate Azure Function App Deploy Matrix
      name: GenerateAzFuncAppDeployMatrix

- job: Deploy
  dependsOn: Terraform
  condition: and(succeeded(), eq(variables['Build.SourceBranch'], variables['DeployBranch']))
  pool:
    vmImage: 'vs2017-win2016'
  strategy:
    matrix: $[ dependencies.Terraform.outputs['GenerateAzFuncAppDeployMatrix.matrix']]
  steps:
    - checkout: none
    - task: DownloadPipelineArtifact@1
      inputs:
        artifactName: AzureFunctionPackage
        targetPath: $(Build.StagingDirectory)
    - task: AzureFunctionApp@1
      displayName: Deploy to Azure Function
      condition: and(succeeded(), eq(variables['Build.SourceBranch'], variables['DeployBranch']))
      inputs:
        azureSubscription: ADSLUSPRTGFunctions-Development
        appType: functionApp
        appName: $(FunctionAppName)
        package: $(Build.StagingDirectory)
        deploymentMethod: zipDeploy