rebase-bot.yml

# Xamarin Rebase Bot build definition: https://devdiv.visualstudio.com/DevDiv/_apps/hub/ms.vss-ciworkflow.build-ci-hub?_a=edit-build-definition&id=13926&view=Tab_Tasks

trigger: none

parameters:
  - name: RepoName
    displayName: Repository Name
    type: string
  - name: RepoOrg
    displayName: Repository Organization
    type: string
  - name: SourceBranch
    displayName: Branch that needs to be repointed to the latest of the PR target
    type: string
  - name: TargetBranch
    displayName: Target Branch of the PR
    type: string
  - name: PRNumber
    displayName: Pull Request Number
    type: number

variables:
  - name: GitHubEndpoint
    value: ${{ parameters.RepoOrg }}
  - name: SourceRepo
    value: ${{ parameters.RepoOrg }}/${{ parameters.RepoName }}
  - name: SourceBranch
    value: ${{ parameters.SourceBranch }}
  - name: TargetBranch
    value: ${{ parameters.TargetBranch }}
  - group: Xamarin-Secrets

resources:
  repositories:
    - repository: rebaseRepo
      type: github
      # TODO: is there a way to not hardcode the endpoint?
      endpoint: xamarin
      name: $(SourceRepo)
      ref: $(SourceBranch)

jobs:
  - job: RebaseBot
    pool:
      vmImage: ubuntu-latest

    variables:
      - name: WorkingDir
        value: $(Build.SourcesDirectory)/${{ parameters.RepoName }}

    steps:
    - checkout: self
    - checkout: rebaseRepo
      persistCredentials: true

    # TODO: redundant, but echo git version
    - powershell: |
        git --version
        git checkout $(SourceBranch)
        git status > $(Build.ArtifactStagingDirectory)/git_status.txt
        Get-Content $(Build.ArtifactStagingDirectory)/git_status.txt
        git diff > $(Build.ArtifactStagingDirectory)/git_diff.txt
      workingDirectory: $(WorkingDir)
      displayName: Check Branch Status

    - powershell: |
        git config user.email "valco@microsoft.com"
        git config user.name "vs-mobiletools-engineering-service2"
        git fetch origin $(TargetBranch)
        git rebase origin/$(TargetBranch)
        git push --force-with-lease
      workingDirectory: $(WorkingDir)
      displayName: Perform Rebase

    - powershell: |
        if ("$(Agent.JobStatus)".Equals("Succeeded")) {
          $state = "success"
          $desc = "succeeded"
          $message = "Hooray"
        } else {
          $state = "failure"
          $desc = "failed"
          $message = "Oh no"
        }

        $buildUri = "$(System.CollectionUri)$(System.TeamProject)/_build/results?buildId=$(Build.BuildId)"
        $headers = @{ Authorization = "token $(github--pat--vs-mobiletools-engineering-service2)" }

        # Comment on the original PR
        $commentJson = @{
          body = "$message! Rebase $desc`! Please see $buildUri for more details."
        } | ConvertTo-Json -Compress

        $commentApi = "https://api.github.com/repos/${{ parameters.RepoOrg }}/${{ parameters.RepoName }}/issues/${{ parameters.PRNumber }}/comments"
        Write-Host "Commenting on original PR via $commentApi"
        Invoke-WebRequest -UseBasicParsing -Method POST -Headers $headers -Uri $commentApi -Body $commentJson
      displayName: Report Status on PR
      condition: always()