Feature branch BRANCH_NAME for PR builds (Github Organization)

[Logan Glickfield]

Hi there!

Is there any way to get the original feature branch name within a pipeline that was triggered by a PR build rather than the "PR-#" style BRANCH_NAME?

I've tried things like:

scm checkout
def branch = sh(returnStdout: true, script: 'git rev-parse --abbrev-ref HEAD').trim()

But that doesn't work because its actually on a detached head commit with no branch.

Our Github Organization is currently configured to use:

- Build origin branches

- Build origin PRs (unmerged head)

We also specify "Include branches" so that we only build the "master PR-*" branches.

It seems like I could use "Build origin branches also filed as PRs" and get the correct BRANCH_NAME for free. But if I understand correctly, "Include branches" would become useless and I would no longer be able to configure it to build only the "master" branch and pull request branches.

Anyone have any ideas how I might be able to make this work?

Thanks!

-Logan

[Sean Flanigan]

Sorry I can't help, but that's an excellent question. I was about to ask it myself (although I build _merged_ heads for PRs).

There don't seem to be any suitable environment variables, so the only option I can think of is to interrogate the Multibranch Plugin, which may or may not have the original branch name in it somewhere. I haven't worked which class to use yet.

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[Sean Flanigan]

I found a workaround for this, but it does require approving a few methods for the Groovy sandbox, and it costs an extra call to the GitHub API:

// TODO use GitHub credentials to avoid rate limiting
// See https://developer.github.com/v3/pulls/#get-a-single-pull-request

def prUrl = new URL("https://api.github.com/repos/my-organisation/my-repository/pulls/${env.CHANGE_ID}")

// use head.label for owner:branch

// use head.ref for the branch name only

def sourceBranchLabel = new groovy.json.JsonSlurper().parseText(prUrl.text).head.label

On 21 October 2016 at 12:46, Sean Flanigan <sean.f...@gmail.com> wrote:

Sorry I can't help, but that's an excellent question. I was about to ask it myself (although I build _merged_ heads for PRs).

There don't seem to be any suitable environment variables, so the only option I can think of is to interrogate the Multibranch Plugin, which may or may not have the original branch name in it somewhere. I haven't worked which class to use yet.