CPH Jenkins Meetup: Developing Jenkins Pipeline

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© 2018 CloudBees, Inc. All Rights Reserved. > whoami @oleg_nenashev oleg-nenashev • Based in Neuchatel, Switzerland • Engineer @ CloudBees • CloudBees Core & CloudBees Jenkins Support • User since 2008, contributor since 2012 • Jenkins Core Maintainer • Jenkins Ambassador: meetups, GSoC, etc. 2

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© 2018 CloudBees, Inc. All Rights Reserved. Jenkins Pipeline is a… 1. Groovy DSL for automatic flow description - Defined in SCM or in Job configuration - 2 syntaxes: Scripted and Declarative // Jenkinsfile node("linux") { git url:"http://github.com/myorg/myproject.git" sh "make all" } http://bit.ly/pipeline-tutorial 5

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© 2018 CloudBees, Inc. All Rights Reserved. Jenkins Pipeline is a… 1. Groovy DSL for automatic flow description 2. Item type Pipeline Job Multi-Branch Pipeline Organization Folder • GitHub • BitBucket* • … 6

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© 2018 CloudBees, Inc. All Rights Reserved. Example. CD for Jenkins IRC Bot def imageName = 'jenkinsciinfra/ircbot’ node('docker') { checkout scm def imageTag = findTag() stage('Build ircbot’) { withMavenEnv (["BUILD_NUMBER=${env.BUILD_NUMBER}:${commit}"]) { sh 'make bot' // Make invokes Maven }} stage ('Build & Deploy container’) { def img = docker.build("${imageName}:${imageTag}”) img.push() } } https://github.com/jenkins-infra/ircbot Docker Registry Server Jenkins SCM Puppet 9

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© 2018 CloudBees, Inc. All Rights Reserved. IDE Integration Unit Test Framework Static Analysis Library manager Debug tools Documen- tation Pipeline deployment Freestyle to Pipeline Converter Good Missing 16 Partial

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© 2018 CloudBees, Inc. All Rights Reserved. Documentation (root) +- README.md +- LICENSE.txt +- … +- src +- org +- oleg +- MailExtSender.groovy +- vars +- cobertura.groovy +- covertura.txt +- runTests.groovy +- runTests.txt Asciidoc / Markdown Javadoc/Groovydoc Standard tools work for Classes … but not for Global Variables https://github.com/jenkinsci/gmaven/pull/1 https://github.com/jenkins-infra/pipeline- library/pull/22 19

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© 2018 CloudBees, Inc. All Rights Reserved. Pipeline Testing. Libraries String clonePath = 'path/to/clone' def library = library() .name('commons') .retriever(gitSource('git@orgithub/devteam/jenkins-shared.git')) .targetPath(clonePath) .defaultVersion("master") .allowOverride(true) .build() helper.registerSharedLibrary(library) // Same as before… loadScript("job/library/exampleJob.jenkins") printCallStack() … 21

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© 2018 CloudBees, Inc. All Rights Reserved. NEW: Pipeline Spock https://github.com/homeaway/jenkins-spock Checks: • Steps are callable • Global variables are accessible • Shared Lib Global vars are accessible + Mocking of Pipeline objects for unit tests 22

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© 2018 CloudBees, Inc. All Rights Reserved. How do I work? Intellij IDEA • Syntax file • Built-in documentation Jenkins Test Instance Source Code local .git repo(s) • Production System Snapshot • Custom Pipeline Library Settings • Filesystem SCM plugin • Repositories for libraries • Jenkinsfile repos volume 28

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© 2018 CloudBees, Inc. All Rights Reserved. What do I need? Dev Tools for Pipeline • IDE, Debugger, Test Tools Community Pipeline Libraries • Support common use-cases without plugins • Pipeline-only plugins work too 34