Get git branch name in Jenkins Pipeline/Jenkinsfile

Use multibranch pipeline job type, not the plain pipeline job type. The multibranch pipeline jobs do posess the environment variable env.BRANCH_NAME which describes the branch.

In my script..

stage('Build') {
    node {
        echo 'Pulling...' + env.BRANCH_NAME
        checkout scm
        
    }
}

Yields…

Pulling...master