从 Azure 管道提交并推送到 GitHub 拉取请求分支

Question

I have an Azure Pipeline [ source , runs ] triggered by pull request. I am following this GitHub guide to commit to the contributor's branch used to create the pull request.

In order to do that, I have disabled the default Pipelines checkout step:

steps:
  - checkout: none

I am then trying to clone the contributor's repository and checkout their branch used for the pull request.

steps:
  ...

  - script: |
      git clone $(System.PullRequest.SourceRepositoryUri) .
      git checkout $(System.PullRequest.SourceBranch)
    displayName: checkout source branch

However, System.PullRequest.SourceRepositoryUri is returning the git URI of my repository, not the contributor's.

My primary repository:

• https://github.com/collinbarrett/FilterLists.git

Variables I have tried using (see here ):

• System.PullRequest.SourceRepositoryURI : https://github.com/collinbarrett/FilterLists.git
• Build.Repository.Uri : https://github.com/collinbarrett/FilterLists

I think I need a predefined variable in a build Pipeline that can give me either of the following:

• https://github.com/<GitHubUsernameOfPrContributor>/FilterLists.git
• <GitHubUsernameOfPrContributor>

How can I clone the pull request contributor's repository and checkout their branch used for the pull request? An answer may be a solution to any of the following:

• Is there another predefined variable that I missed that contains the contributor's repository URI or GitHub username?
• Can I tweak the Azure Pipelines checkout task to checkout the branch from the other contributor's repository instead of my own? In order to configure the fork as a Resource , it seems like I would need the contributor's fork URI or username.
• Can I get this URI from the GitHub API directly somehow?
• Is there some other solution? It seems I am making this more difficult than it should be...

UPDATE : Also requested on Microsoft Developer Community . Upvotes there appreciated.

Answer 1

I am able to get what I need by calling the GitHub API from my Pipeline. A predefined variable from Azure Pipelines would be preferred, but this will work for now.

  - bash: |
      FORKURI=$(curl -X GET "https://api.github.com/repos/$BUILD_REPOSITORY_NAME/pulls/$SYSTEM_PULLREQUEST_PULLREQUESTNUMBER" | jq -r '.head.repo.clone_url')
      git clone "$FORKURI" .
      git checkout "$SYSTEM_PULLREQUEST_SOURCEBRANCH"
    displayName: checkout source branch