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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.
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Head over to your Jenkins instance and create a new item. Enter a name for the job, and select the “Multibranch Pipeline” option at the end of the screen. Then, click on the OK button. In the next screen, go to the “Branch sources” tab, click on the “Add source” button, and choose “Git” from the dropdown menu.
When the pipeline build starts, Jenkins uses the Jenkinsfile in that branch for build stages. SCM (Source Control) can be Github, Bitbucket, or a Gitlab repo. You can choose to exclude selected branches if you don't want them to be in the automated pipeline with Java regular expressions.
The Multibranch Pipeline project type enables you to implement different Jenkinsfiles for different branches of the same project. In a Multibranch Pipeline project, Jenkins automatically discovers, manages and executes Pipelines for branches which contain a Jenkinsfile in source control.
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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