azure-pipelines.yaml

# Auto-update PR branches with the latest target branch changes
# Version: 1.0
# Source: https://github.com/f1x3d/azure-devops-pr-branch-auto-update

trigger:
  batch: true
  branches:
    include:
    - '*'

pool:
  vmImage: ubuntu-latest

steps:
- checkout: self
  clean: true
  persistCredentials: true

- pwsh: |
    Write-Host '##[command]git config user.email "pipeline@localhost"'
    git config user.email "pipeline@localhost"

    Write-Host '##[command]git config user.name "Automated Workflow"'
    git config user.name "Automated Workflow"
    
    $TargetBranchName = "$(Build.SourceBranch)".replace('refs/heads/', '')

    Write-Host "##[command]git fetch origin $TargetBranchName --depth=2147483647"
    git fetch origin $TargetBranchName --depth=2147483647
    
    Write-Host "##[command]git checkout $TargetBranchName"
    git checkout $TargetBranchName

    $PrCommentRequestBody = @{
      comments = @(
        @{
          content = "Please resolve merge conflicts"
          commentType = "text"
        }
      )
      status = "active"
    } | ConvertTo-Json

    $PullRequests = Invoke-RestMethod `
      -Method Get `
      -Uri '$(System.CollectionUri)$(System.TeamProject)/_apis/git/repositories/$(Build.Repository.Name)/pullrequests?searchCriteria.targetRefName=$(Build.SourceBranch)&api-version=7.0' `
      -Authentication Bearer `
      -Token (ConvertTo-SecureString $Env:SYSTEM_ACCESSTOKEN -AsPlainText -Force)
    
    foreach ($PullRequest in $PullRequests.value | where isDraft -eq $False)
    {
      $SourceBranchName = $PullRequest.sourceRefName.replace('refs/heads/', '')

      Write-Host "##[command]git fetch origin $SourceBranchName --depth=2147483647"
      git fetch origin $SourceBranchName --depth=2147483647
      
      Write-Host "##[command]git checkout $SourceBranchName"
      git checkout $SourceBranchName
      
      Write-Host "##[command]git merge $TargetBranchName"
      git merge $TargetBranchName

      if ($?)
      {
        Write-Host '##[command]git push origin'
        git push origin
      }
      else
      {
        Write-Host '##[command]git merge --abort'
        git merge --abort

        Invoke-RestMethod `
          -Method Post `
          -Uri "$(System.CollectionUri)/$(System.TeamProject)/_apis/git/repositories/$(Build.Repository.Name)/pullrequests/$($PullRequest.pullRequestId)/threads?api-version=7.0" `
          -Authentication Bearer `
          -Token (ConvertTo-SecureString $Env:SYSTEM_ACCESSTOKEN -AsPlainText -Force) `
          -ContentType "application/json" `
          -Body $PrCommentRequestBody
      }
    }
  displayName: Merge changes into the open PRs
  env:
    SYSTEM_ACCESSTOKEN: $(System.AccessToken)