Opening opensource : The Jenkins Way

Opening Opensourcethe Jenkins Way
BreizhCamp 17 juin 2011
©2011 Cloud Bees, Inc. All Rights Reserved

Nicolas De loof
Java-Boy
New-Bee at
(ex-)CommitterMaven
JUG-Leader
©2011 CloudBees, Inc. All Rights Reserved

Jenkins ?

de factocontinuousintegration Server in Java ecosystem(non exclusive)
Basis for Software Factory automation
Q&A Code inspection
Release management
Continuousdeployment
Business Intelligence …

Hudson / Jenkins : the fork

User choosed Jenkins
13 000 downloads / week
1 500 member on jenkins-users
4 000 followers @jenkinsci

900 members on jenkins-dev
48 active contributors, 94 publicized
170 Pull-requestsfromoccasionalcontributors
11,3 changes per release(6,7 before the fork)
… as Developersdid

OpenSource model
How to attract new contributors ?

Voice committer
Committer
Contributor
Supporting User
User
Standard OSS model « meritocratic »

Use the tool
Contribute to user-forum
Getfamiliarwith the code
Contribute to dev-forum
Fix bugs and post patches
Be nicewitheverybody
Do some lobbying
How to become a Committer …

Difficult to getinto the code
Difficult to getspare time
Difficult to fix bug or add new features
Laborious to create and maintain patches
Frustrating to wait for approval
How manytalentuousguys do weloosehere ?
In practice…

Mypersonalexperience
Motivation
(# of contributions)
(neveroccurred)

Rule #1 : lower the contribution barrier
The Jenkins-way

Want to contribute ?
Ask for commit

« Withgreat power, comesgreatresponsibility »
Self-censoredcontributors

Discover a regression : revert
Test harness to the rescue(stillmuch to do there)
Possible if therewas few changes between releases !
Hey, thisis SCM roleafter all !

Rule #2 : Release often (even more)
The Jenkins-way

One release per week
Few changes between releases
Easy to rollbackwhensomethingisbroken
+ « stable but older » branch (3 month) withCritical bug fixes only
Jenkins releases

OpenSource model
How to merge contributions ?

Contributormayask for code review
Contribution mayrequire few changes beforebeeingapplied
Wedon’twant to discouragecontributors
WTF ?

Diff format isdefinitly not a sexy format for humans
> +@Deprecated
> +public class Base64
> +{
> + public Base64()
> + {
> + super();
Doesitreallyneed to call Object.super(). Can we not leaveitwith
the default constructor as Plexus' original has?
> + }
Diff format (SVN patch)

GitHub pull request

Rule #3 : Tools matter, use the right ones
The Jenkins-way
patch
Pull request +
Commit pattern

Origin of the Hudson/Jenkins fork(java.netoutage)
200 forks on Jenkins GitHub repo !
170 pull requests
Jenkins atGitHub

Opensource model
Embrace new features

250 plugins !(maven plugin is the only one in core)
Evengrowingecosystem
Contributorcan focus on some plugin thatbringthem value daily
Modular design

Extension point withruntimediscovery
Need to plugsomewhere in Jenkins ? add a new extension point
Someidea for a new plugin ?  add for a repo on github/jenkins-ci
Extensibility

Rule #6 : design for extensibility
 Multiple technical solutions (incl. @Inject)
The Jenkins way

OpenSource model
How to talk together ?

User forum
Dev forum
Private forum
(+ lobbying)
Multiple discussion levels

Need for private discussion whenitcouldhurtsomeone
invitation for new Committers
… but wedon’t have to « filter » committersanymore
WTF ?

All discussions are public
On jenkins-dev
On irc #jenkinsci
Meeting bi-weekly on irc
Logged by irc-bot for lateravailabilityhttp://meetings.jenkins-ci.org/jenkins
transparency

Rule #4 : Makethings transparent
The Jenkins way

OpenSource model
Who’s the boss ?

Right, projectneedssome sort of lead… but not a despot !
« BenevolentDictator For Life »-syndrom
Lead

Highly active contributor
Good knowledge of projecthistory
Good technicalskills
Visionary
Newbie-compliant
Not egocentric
Lead must be …

Kohsuke Kawaguchi
Andrew Bayer
Dean Yu
(all from != companies)
And discuss in public !
Lead-commiteeissafer

Rule #5 : choose a good Lead model
 focus first on building a community
The Jenkins way

Opensource (x)or Business ?

(

CloudBees relation with Jenkins ?

Nectar : enhanced & supported Jenkins
DEV@Cloud : hosted software factory
RUN@Cloud : Java PaaS
Public : hosted by Amazon
Private : on yourownvirtualized infra
CloudBees in 5 words

KK is a CloudBeesemployee… but CloudBeesengaged to neverinterferewith Jenkins Lead committee
DEV@Cloudisawesomethanks to active opensourceecosystem !
CloudBees vs OpenSource

CloudBeescontributesbugfixes to OSS
CloudBees vs OpenSource

Q&A, stabilised + support (here I am!)
Some entreprise plugins
Security (RBAC)
Virtualisation, auto-scaling, hypervisorintegration
Jobs classification (folders)
Advanced Backup
…
Nectar value for entreprises

Jenkins cluster
Multi-tenant masters
Pool of slaves
Automaticprovisionning
On phisical or virtual machines
Centralised management (plugins, upgrades, default config…)
DEV@CloudPrivate Edition

Thanks to flexible Jenkins model
Easiest maintenance
Easiest contributions to oss
All thosesfeatures are Plugins !

)

Does Jenkins model applyelsewhere ?

I’mtrying to for GWT-maven-plugin
Does Jenkins model applyelsewhere ?

#1 : lower the contribution barrierjustask to join the team !
#2 : release oftenone release per month
#3 : toolsmattermovedfromcodehaussvn to GitHub
#4 : makeit transparenteverythinghappens on googlegroups
#5 : choose a good lead-modelmyself + Olivier Lamy, may change …
#6 : design for extensibilitymore investigation requiredhere
Applyingrules

Future willsay…
Allready 3 contributors to join :
complaining about missingfeatures,
encouraged to contribute,
added to team,
theyfixed issues by themself !
Salvador Diaz to analyse Pull Request
Pierre-Yves Ricaucommitted 5 fixes
Doesitwork ?

Q&A
Thankyou

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Opening opensource : The Jenkins Way

by Nicolas De loof on Jun 20, 2011

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