Get git branch name with gradle git plugin on jenkins slave

Question

I'm doing sonar integration and would like to pass git branch as a parameter. It will be run on Jenkins server.

Before I was using next line of code to get current git branch:

def workingBranch = """git rev-parse --abbrev-ref HEAD""".execute().text.trim()

After I replaced it with:

grgit.branch.current.fullName

But this always gives me "HEAD". How to achieve same functionality?

It is not possible in this way. You should use jenkins env variables — Eugen Martynov, Jul 05 '18 at 15:06
Sorry for the really late answer, but I just stumbled upon this question. I'm not sure exactly which method applies better to your situation. But, I hope this helps someone. — kevinmm, Oct 27 '20 at 18:41

score 2 · Accepted Answer · answered Oct 27 '20 at 18:38

I am doing something very similar. As it turns out, the Git plugin in Jenkins is tuned in several ways to minimize the git clone and checkout. There are 2 ways that I've found to deal with this.

The Easy Way

Use Jenkins' built-in environment variables, as you already suggested in the comments.

def workingBranch = System.getenv("GIT_BRANCH") ?: grgit.branch.current.fullName

The Job Configuration Way

You can also set up the job to checkout the branch as a local branch, rather than a detached HEAD. This is under "Additional Behaviors", named "Check out to specific local branch". There are many other questions that detail the settings for that, and/or the Declarative Pipeline approach, depending on what your needs.

Get git branch name with gradle git plugin on jenkins slave

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