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Jenkins Job DSL / Plugin

The Jenkins "Job DSL / Plugin" is made up of two parts: The Domain Specific Language (DSL) itself that allows users to describe jobs using in a Groovy-based language, and a Jenkins plugin which manages the scripts and the updating of the Jenkins jobs which are created and maintained as a result.

Background

Jenkins is a wonderful system for managing builds, and people love using its UI to configure jobs. Unfortunately, as the number of jobs grows, maintaining them becomes tedious, and the paradigm of using a UI falls apart. Additionally, the common pattern in this situation is to copy jobs to create new ones, these "children" have a habit of diverging from their original "template" and consequently it becomes difficult to maintain consistency between these jobs.

The Jenkins job-dsl-plugin attempts to solve this problem by allowing jobs to be defined with the absolute minimum effort in a programmatic form. The goal is for your team to be able to define all the jobs they wish to be related to their project, declaring their intent for the jobs programmatically, and leaving the common elements in each of them hidden behind the DSL.

For example, your project might require a unit test job, a nightly SonarQube build, an integration test job, and a promotion job. Permission to run the release job should be limited to certain users. Here's the example DSL script:

def gitUrl = 'git://github.com/jenkinsci/job-dsl-plugin.git'

job('PROJ-unit-tests') {
    scm {
        git(gitUrl)
    }
    triggers {
        scm('*/15 * * * *')
    }
    steps {
        maven('-e clean test')
    }
}

job('PROJ-sonar') {
    scm {
        git(gitUrl)
    }
    triggers {
        cron('15 13 * * *')
    }
    steps {
        maven('sonar:sonar')
    }
}

job('PROJ-integration-tests') {
    scm {
        git(gitUrl)
    }
    triggers {
        cron('15 1,13 * * *')
    }
    steps {
        maven('-e clean integration-test)
    }
}

job('PROJ-release') {
    scm {
        git(gitUrl)
    }
    // no trigger
    authorization {
        // limit builds to just Jack and Jill
        permission('hudson.model.Item.Build', 'jill')
        permission('hudson.model.Item.Build', 'jack')
    }
    steps {
        maven('-B release:prepare release:perform')
        shell('cleanup.sh')
    }
}

NOTE: This example requires additional Jenkins plugins to be installed, and hence won't run "out of the box". Read the wiki for isolated examples and step-by-step guides to get this example working.

Manually creating these jobs wouldn't be too hard, but doing the same thing all over again for every new branch or for a hundred other projects is where it gets interesting (and by "interesting" we mean "difficult"). An anti-pattern that people use in Jenkins to minimize the amount of job configuration, they make a single parameterized job to do all these things in one job, but then the history of the job is skewed and they were limited in some settings like triggers. This provides a much more powerful way of defining them.

Please refer to the Job DSL wiki for further documentation and examples.

Features

  • DSL - Scriptable via Groovy
  • DSL - Direct control of XML, so that anything possible in a config.xml is possible via the DSL
  • DSL - Helper methods for common job configurations, e.g. scm, triggers, build steps
  • Plugin - DSL can be put directly in a job
  • Plugin - DSL can be put into SCM and polled using standard SCM triggering
  • Plugin - Multiple DSLs can be referenced as a time

Basic Usage

See the wiki for specific steps and other examples.

  1. Create a Jenkins Job using the Free-style project style to run your DSL Scripts. This is called a "Seed" job
  2. Configure the seed job, by adding a "Build Step" of type "Process Job DSLs" and paste in the body of the DSL
  3. Run the seed to generate your new jobs from your script. When successful, the "build result" page will list the jobs which have been successfully created

Building

Prerequisites:

  • JDK 6 (or above)

To build the plugin from source:

./gradlew build

To run Jenkins (http://localhost:8080) and test the plugin:

./gradlew server

Build job-dsl.hpi to be installed in Jenkins:

./gradlew jpi

IntelliJ IDEA and Eclipse (STS) have the ability to open Gradle projects directly, but they both have issues. IDEA sometimes does not detect all plugin dependencies (e.g. hudson.maven.MavenModuleSet) and as a workaround you need to hit the refresh button in the Gradle tool window until it does. You also need to run the localizer task to generate the Messages class before building and testing the project in the IDE:

./gradlew localizer

Authors

Justin Ryan [email protected]

Andrew Harmel-Law [email protected]

Daniel Spilker [email protected]

Matt Sheehan [email protected]

Mailing List

To track progress and ask questions head over the mailing list

Artifacts

The library is built using Jenkins-on-Jenkins and is released via its update center.

License

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.