Jenkins – the branch name variable for Jenkins multibranch pipelines

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I need to know which branch is being built in my Jenkins multibranch pipeline in order for it to run steps correctly.

We are using a gitflow pattern with dev, release, and master branches that all are used to create artifacts. The dev branch auto deploys, the other two do not. Also there are feature, bugfix and hotfix branches. These branches should be built, but not produce an artifact. They should just be used to inform the developer if there is a problem with their code.

In a standard build, I have access to the $GIT_BRANCH variable to know which branch is being built, but that variable isn't set in my multibranch pipeline. I have tried env.GIT_BRANCH too, and I tried to pass $GIT_BRANCH as a parameter to the build. Nothing seems to work. I assumed that since the build knows about the branch being built (I can see the branch name at the top of the console output) that there is something that I can use – I just can't find any reference to it.

Best Answer

The env.BRANCH_NAME variable contains the branch name.

As of Pipeline Groovy Plugin 2.18, you can also just use BRANCH_NAME (env isn't required but still accepted.)

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Jenkins – Triggering Branch Indexing on Multibranch Pipelines (Jenkins/Git)

The method ComputedFolder.scheduleBuild() can be invoked from a groovy script.

I have just triggered branch indexing in one multibranch pipeline project from the groovy code in a different multibranch pipeline project, which is then triggering a downstream build in that project.

The code is something like:

@NonCPS
void scanRepo(String downStreamProjectName) {
    Jenkins.instance.getItemByFullName(downStreamProjectName).scheduleBuild()
}
...
String downStreamProject = 'my-folder/my-multibranch-project'
String downStreamJob = "${downStreamProject}/${env.BRANCH_NAME}"
if (Jenkins.instance.getItemByFullName(downStreamJob) == null) {
    scanRepo(downStreamProject)
    while (Jenkins.instance.getItemByFullName(downStreamJob) == null) {
        sleep(1)
    }
}
build([job: downStreamJob, wait: false, quietPeriod: 0])

Notice that Jenkins.instance.getItemByFullName(downStreamProjectName) is the WorkflowMultiBranchProject which is not Serializable, so some care needs to be taken.

Best Answer

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