Accessing SCM (Git) variables on a Jenkins Pipelin

Question

This question already has an answer here:

• Git Variables in Jenkins Workflow plugin 7 answers

Here's my pipeline code:

node ('master') {
    git url: "$GIT_REPO_URL", branch: "$GIT_BRANCH"
    echo env.GIT_COMMIT
    echo env.GIT_BRANCH
    echo env.GIT_REVISION
}

The build results looks like:

Started by user anonymous
[Pipeline] Allocate node : Start
Running on master in /var/lib/jenkins/jobs/test/workspace
[Pipeline] node {
[Pipeline] git
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://acme/scm/app.git # timeout=10
Fetching upstream changes from https://acme/scm/app.git
 > git --version # timeout=10
 > git fetch --tags --progress https://acme/scm/app.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision fb455725db1b768ff63e627a087d2771099af7c4 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f fb455725db1b768ff63e627a087d2771099af7c4 # timeout=10
 > git branch -a -v --no-abbrev # timeout=10
 > git branch -D master # timeout=10
 > git checkout -b master fb455725db1b768ff63e627a087d2771099af7c4
 > git rev-list fb455725db1b768ff63e627a087d2771099af7c4 # timeout=10
[Pipeline] echo
null
[Pipeline] echo
null
[Pipeline] echo
null
[Pipeline] } //node
[Pipeline] Allocate node : End
[Pipeline] End of Pipeline
Finished: SUCCESS

The env variables env.GIT_COMMIT, env.GIT_BRANCH are not populated. Are those values available in another variables?

Answer 1

Here is an example of how you can get GIT_COMMIT - https://github.com/jenkinsci/pipeline-examples/blob/master/pipeline-examples/gitcommit/gitcommit.groovy

You can extend it to expose GIT_BRANCH as well. This script is from the workflow examples git repo managed by cloudbees. Maybe you can send a pull request if you add capability to retrieve GIT_BRANCH variable.