能否将Jenkins Multibranch Job的分支源、行为等配置存入Jenkinsfile？

Great question! Let's break this down clearly:

Short Answer #

You cannot store Multibranch Job-level configurations like Branch Source or Behaviours directly in a Jenkinsfile. Here's why, plus what you can do instead:

Why Jenkinsfile Isn't the Right Place #

A Jenkinsfile is designed to define the execution logic of your pipeline—think build steps, test runs, deployment workflows, and conditional logic for specific branches.

Multibranch Job settings like Branch Source (e.g., which Git repo to pull from) and Behaviours (e.g., include/exclude branches, scan frequency) are part of the job's infrastructure configuration. These tell Jenkins how to discover and manage branches in the first place, before it even runs any pipeline defined in a Jenkinsfile.

Code-First Alternatives to Manage These Configs #

If you want to version-control these Multibranch Job settings (which is a great practice!), use one of these two Jenkins tools:

1. Job DSL Plugin #

The Job DSL plugin lets you define Jenkins jobs (including Multibranch Pipelines) using Groovy code. You can specify every detail of your Multibranch Job, from Branch Source to Behaviours, in a script that you commit to your repo.

Here's a quick example snippet:

multibranchPipelineJob('my-multibranch-job') {
  branchSources {
    git {
      remote('https://github.com/your-username/your-repo.git')
      credentialsId('git-credentials')
      behaviours {
        discoverBranches() // Discover all branches
        excludeBranch('dependabot/**') // Exclude dependabot branches
        ignoreOnPushNotifications() // Optional: Adjust push behavior
      }
    }
  }
  triggers {
    periodicFolderTrigger {
      interval('15m') // Scan for new branches every 15 minutes
    }
  }
}

You can run this script via a Freestyle Job or a Pipeline Job to create/update your Multibranch Job automatically.

2. Jenkins Configuration as Code (JCasC) #

JCasC lets you define your entire Jenkins instance's configuration (including jobs) using YAML files. This is ideal for managing Jenkins at scale, as you can version-control all your Jenkins settings in a single repo.

Here's a YAML snippet for a Multibranch Job:

jobs:
  - script: >
      multibranchPipelineJob('my-multibranch-job') {
        branchSources {
          git {
            remote('https://github.com/your-username/your-repo.git')
            credentialsId('git-credentials')
            behaviours {
              discoverTags() // Discover tags in addition to branches
              includeBranch('main|develop') // Only include main/develop
            }
          }
        }
      }

You can load this YAML via Jenkins' JCasC configuration page, and Jenkins will apply the job settings automatically.

What You Can Do in Jenkinsfile #

While you can't manage Branch Source/Behaviours in Jenkinsfile, you can control pipeline logic based on the branch. For example:

pipeline {
  agent any
  stages {
    stage('Build') {
      steps {
        sh 'npm install && npm run build'
      }
    }
    stage('Deploy') {
      when {
        branch 'main' // Only run this stage on main branch
      }
      steps {
        sh 'npm run deploy-prod'
      }
    }
  }
}

This lets you tailor your pipeline execution to specific branches, but it doesn't change how Jenkins discovers or manages those branches.

内容的提问来源于stack exchange，提问作者sreejith p s