Access GitHub Pull Request Number from within Jenkinsfile? (in the refactored Multibranch Pipeline plugin)

[Paper Arts Calif]

Hello,

I am trying to access the Pull Request Number from within my Jenkinsfile, so that my Multibranch Pipeline build can do interesting stuff with it (like post a comment to the PR). Unfortunately, although the documentation claims this is available in CHANGE_ID, I have not found this to be the case. I am running the newly refactored Multibranch Pipeline plugin.

Jenkins base version: 2.60.1

Pipeline:Multibranch plugin version: 2.16

My Jenkinsfile contains this code:

            echo "CHANGE_ID is ${env.CHANGE_ID}"

            echo "PULL_REQUEST is ${env.PULL_REQUEST}"

My Multibranch Pipeline project detects when I have created a PR branch, and it automatically builds the PR branch.

However, the build output contains this:

[Pipeline] echo

CHANGE_ID is null

[Pipeline] echo

PULL_REQUEST is null

I found this Stack Overflow article 

https://stackoverflow.com/questions/41695530/how-to-get-pull-request-id-from-jenkins-pipeline

which suggests I need to 

- Disable branch builds

- Enable PR builds

- Check a checkbox 'Build origin PRs (unmerged head)

^^ All of which appear to pertain to a January 2017 version (now deprecated) of the plugin.

Anyhow, as I said, my PR branch is being detected and built, but even dumping out 'env' did not show any env vars containing the PR number.

[Stephen Connolly]

https://github.com/jenkinsci/branch-api-plugin/blob/master/src/main/java/jenkins/branch/BranchNameContributor.java#L65 is the code.

Have you updated your github and/or bitbucket plugins to the versions that actually expose the ChangeRequestSCMHead2 interface?

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