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Hacking documentation

This document explains how to develop on this repository.

Building

Build with the usual

docker build -t jenkins/jenkins .

Tests are written using bats under the tests dir

DOCKERFILE=Dockerfile bats tests
DOCKERFILE=Dockerfile-alpine bats tests

Download the test helpers by updating the submodules

git submodule update --init --recursive

Bats can be easily installed with brew install bats on OS X

Multiarch support

Multiarch support is added via the publish-experimental.sh script, which relies on QEMU for emulating the architecture being built as well as the Docker manifest-tool for creating registry v2.2 "thick" manifests.

When changes are pushed to the upstream Jenkins project, a job is triggered via the Jenkinsfile from this repo, which then runs the publish-experimental.sh script in parallel mode. Multiarch images created by the script are built/tagged/pushed to the Docker Hub jenkins4eval/jenkins repo.

Currently supported architectures:

  • amd64

  • arm32

  • arm64

  • s390x

  • ppc64le

NOTE:This functionality may change/move at some point in the future.

Debugging

In order to debug the master, use the -e DEBUG=true -p 5005:5005 when starting the container. Jenkins will be suspended on the startup in such case, and then it will be possible to attach a debugger from IDE to it.

Test the publishing using an overridden target repository on Docker Hub

Create a new dedicated target repository in your Docker Hub account, and use it like follows:

export DOCKERHUB_ORGANISATION=batmat
export DOCKERHUB_REPO=test-jenkins
# The log below will help confirm this override was taken in account:
./publish.sh --variant jdk11
Docker repository in Use:
* JENKINS_REPO: batmat/test-jenkins
...

Test the publishing of Multi-arch image using an overridden target repository

Create a new dedicated target repository in your Docker Hub account, and use it like follows:

export DOCKERHUB_ORGANISATION=durgadas
export DOCKERHUB_REPO=jenkins

./publish-experimental.sh --variant alpine

# The log below will help confirm this override was taken in account:
Docker repository in Use:
* JENKINS_REPO: durgadas/jenkins
...

Also, one can execute the publish-experimental.sh using:

make publish-experimental