Is there a way with Azure Devops Pipeline to trigger on pull request completion?

I have a pipeline that needs to run on a cron on main, but also trigger when a pull request is merged into main. There is a trigger for this, however, I would need the pull request number to pass as a variable for a script to run against.

Are there any more options? besides a webhook to trigger on pull request completion, but also access the pull request number? Without relying on a git commit messages.

I have explored the following, however, I would prefer the pipeline configuration to contain this logic:

• Azure Devops Webhook - which can run if a pull request is completed.

You can use Webhook triggers to trigger the pipeline when a PR merge to the main branch is completed.

Below are the detailed steps of configuration:

1. Go to "Project Settings" > "Service connections" to create an Incoming WebHook service connection.

   • WebHook Name: A custom name of the webhook. For example, CompletePR.
   • Service connection name: A custom name of the service connection. For example, IWHSC_CompletePR.

   

2. Go to "Project Settings" > "Service Hooks" to create a Web Hooks type subscription.

   • On the 'Service' section, select "Web Hooks" as the service.

     

   • On the 'Trigger' section,

     • Trigger on this type of event is "Pull request merge attempted".
     • Repository is your Git repository.
     • Target branch is main.
     • Merge result is Merge Successful.
     • Other options can keep as default.

     

   • On the 'Action' section, set the value of URL to be the following one. Other options can keep as default.

     https://dev.azure.com/{organization}/_apis/public/distributedtask/webhooks/{webhookName}?api-version=6.0-preview
     

     Replace {organization} with the actual name of your Azure DevOps organization. The {webhookName} should be same as the WebHook Name set on above Incoming WebHook service connection. For example,

     https://dev.azure.com/myOrg/_apis/public/distributedtask/webhooks/CompletePR?api-version=6.0-preview
     

     

3. Set the pipeline with a Webhook trigger like as below.

   # azure-pipelines.yml
   
   . . .
   
   resources:
     webhooks:
     - webhook: CompletePR  # The name should be same as the webhook name set above.
       connection: IWHSC_CompletePR  # The name of Incoming WebHook service connection.
       filters:
       - path: resource.status
         value: completed  # Set the pipeline to be triggered when the PR merge is completed.
   
   # Set some global variables to store the information of completed PR.
   # Any tasks in this pipeline can call these variables.
   variables:
     prId: ${{ parameters.CompletePR.resource.pullRequestId }}
     prTitle: ${{ parameters.CompletePR.resource.title }}
     prStatus: ${{ parameters.CompletePR.resource.status }}
     sourceBranch: ${{ parameters.CompletePR.resource.sourceRefName }}
     targetBranch: ${{ parameters.CompletePR.resource.targetRefName }}
     commitId: ${{ parameters.CompletePR.resource.lastMergeCommit.commitId }}
     commitComment: ${{ parameters.CompletePR.resource.lastMergeCommit.comment }}
   
   steps:
   - bash: |
       echo "prId = $(prId)"
       echo "prTitle = $(prTitle)"
       echo "prStatus = $(prStatus)"
       echo "sourceBranch = $(sourceBranch)"
       echo "targetBranch = $(targetBranch)"
       echo "commitId = $(commitId)"
       echo "commitComment = $(commitComment)"
     displayName: 'Pull Request Information'
   
   . . .
   

4. Result.