azure-pipelines-code-mirror.yml

# Disable CI triggers, only called using Maestro
trigger: none

variables:
  - group: Mirror-Credentials

# Moves code from GitHub into internal repos
jobs:
- template: /eng/common/templates/jobs/jobs.yml
  parameters:
    enableTelemetry: true
    helixRepo: dotnet/arcade
    jobs:
    - job: Merge_GitHub_to_Azure_DevOps
      enableSBOM: false
      pool:
        name: NetCore1ESPool-Internal
        demands: ImageOverride -equals Build.Ubuntu.1804.Amd64
      variables:
      - name: WorkingDirectoryName
        value: repo-dir
      steps:
      - powershell: |
          $azDORepo = "$(GithubRepo)".Replace("/", "-");
          # Check that the parameters look correct
          if ($azDORepo -eq "" -or "$(BranchToMirror)" -eq "")
          {
            Write-Error "Expected valid branch and GitHub repo in the form of owner/repo"
          }
          Write-Host "##vso[task.setvariable variable=AzDORepoName]$azDORepo"
          Write-Host "Mirroring branch '$(BranchToMirror)' from GitHub repo '$(GithubRepo)' to Azure DevOps repo '$azDORepo'."
        displayName: Calculate Mirrored Branch Names
      - script: |
          git clone https://dotnet-maestro-bot:$(BotAccount-dotnet-maestro-bot-PAT)@github.com/$(GithubRepo) $(WorkingDirectoryName) -b $(BranchToMirror)
        displayName: Clone GitHub repo
      - script: |
          git remote add azdo-mirror https://dn-bot:$(dn-bot-dnceng-build-rw-code-rw)@dev.azure.com/dnceng/internal/_git/$(AzDORepoName)
        displayName: Add Azure DevOps remote
        workingDirectory: $(WorkingDirectoryName)
      - script: |
          git reset --hard origin/$(BranchToMirror)
        displayName: Hard reset local branch to GitHub branch
        workingDirectory: $(WorkingDirectoryName)
      - powershell: |
          git push azdo-mirror $(BranchToMirror) --tags $(ExtraPushArgs)

          if ($LASTEXITCODE -EQ 0) {
            Write-Host "Push was successful"
            exit
          }

          git fetch azdo-mirror
          git fetch origin
          $commits = (git --no-pager rev-list origin/$(BranchToMirror)..azdo-mirror/$(BranchToMirror) | Measure-Object -line).Lines
          if ($commits -NE 0) {
            Write-Host "##vso[task.LogIssue type=error;]Mirror repository $(AzDORepoName) has unexpected commits"
            git --no-pager log origin/$(BranchToMirror)..azdo-mirror/$(BranchToMirror)
            exit 1
          }

          Write-Host "##vso[task.LogIssue type=warning;]Push failed for unknown reason"

          $retryattempt=0
          while ($retryattempt -LT 3) {
            $retryattempt+=1
            Write-Host "Retry attempt $retryattempt of 3 in 5 seconds..."
            Start-Sleep -Seconds 5

            git push azdo-mirror $(BranchToMirror) $(ExtraPushArgs)
            if ($LASTEXITCODE -EQ 0) {
              Write-Host "Push successful"
              exit
            }
          }

          Write-Host "##vso[task.LogIssue type=error;]git failed to push to Azure DevOps mirror"
          exit 1
        displayName: Push changes to Azure DevOps repo
        workingDirectory: $(WorkingDirectoryName)

      - powershell: |         
          $commit = (git rev-parse HEAD).Substring(0, 7)
          $target = "$(GithubRepo) $(BranchToMirror)".Replace('/', ' ')

          Write-Host "##vso[build.updatebuildnumber]$target $commit"
          Write-Host "##vso[build.addbuildtag]$target"
        displayName: Broadcast target, branch, commit in metadata
        continueOnError: true
        condition: always()
        workingDirectory: $(WorkingDirectoryName)