Git Workflow Strategies for Technical Debt Management

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Git Workflow Strategies for
Technical Debt Management
Raquel Pau
@raquelpau
http://walkmod.com

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About me…
• EngProd Team member at Schibsted
• WalkMod Founder
• Almost 10 years of experience in Java
• Speaker at several occasions
• Legacy Code Rocks BCN organizer

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SOFTWARE IS EATING THE WORLD

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TECHNICAL DEBT GENERATES
THE FEAR OF CHANGE

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IF IT WORKS, DO NOT CHANGE IT

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Category Best Practise
Knowledge Debt Continuous Inspection (Code Review)
Testing Debt Continuous Integration
Infrastructure Debt Continuous Delivery
TECHNICAL DEBT CATEGORIES

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FEATURE BRANCH WORKFLOW

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SMALL AND VERIFIED PATCHES

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FASTER
SOONER
BETTER

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ORCHESTRATING
THE RELEASE PROCESS

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CONTINUOUS DELIVERY

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MEASURE BUSINESS VALUE
MORE FREQUENTLY

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MICROSERVICES
AND
CONTINUOUS DELIVERY

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NO MORE
JOBS PLEASE

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PIPELINES
AS CODE

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Features of Pipeline Ecosystem
• Configurations in Source Repositories
• Less click-and-type, more code
• From simple to complex
• Survives Jenkins restarts & connection losses
• Reusable definitions
• Build history/trend segregated per branches

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Jenkins Pipeline Example

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Jenkins Pipeline Example

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Jenkins Pipeline Example

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TWO PIZZA TEAMS

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Fabric 8: Integrated Development Platform
Create Wizards to create micro-services
Build Packaging into multiple container images
Release Rolling upgrades across teams environments
Runtime Service discovery, scaling, failover, load balancing
Manage Centralise logs, metrics, alerts, tracing, circuit
breaker
Feedback Dashboards and Metrics to get feedback
Platform On premise, public or hybrid cloud

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DIVERSIFIED TEAMS

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AND ONE DAY
TECHNICAL DEBT STARTED

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TO REDUCE DEBT
WE NEED
METRICS AND TOOLS

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feature#1234
feature#1354
CONTINUOUS INSPECTION

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@SupressWarnings(“PMD”)

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MANY
CODING STYLE RULES ARE
AUTOMATICALLY FIXEABLE

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mvn walkmod:patch
gradle walkmodPatch

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public void visit(ImportDeclaration n, VisitorContext vc) {
if (n.getUsages().isEmpty()) {
n.remove();
}
}
It is all about code transformations

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* KILLER FEATURE *
FORMAT PRESERVATION

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TRUST TOOLS
OR
ENSURE TEST COVERAGE

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mvn walkmod:patch
git apply walkmod.patch
mvn test
git commit –a –fixup HEAD
git pull –rebase origin $branch
git push origin HEAD:$branch
Fix-Up Recipe

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CONTINUOUS FIXINGS
feature#1354
git commit -a --fixup HEAD

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#!groovy
@Library(‘github.com/walkmod/jenkins-pipeline-shared@maven’)
…
stage(‘Fixing Release’) {
steps {
walkmodApply(
validatePatch: false,
branch: ${branch},
alwaysApply: true,
alwaysFail: true )
}
}
Pipeline Library

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walkmodApply: fixes your build
hasWalkmodPatch: checks if there are fixings
applyWalkModPatch: applies the patch
pushWalkModPatch: pushes the patch
WalkMod Pipeline API

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Incremental Execution
Microservices - Start it now
Legacy Code - apply them incrementally

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WalkModHub

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• Fear of Changing
• Release each commit!
• Pipelines in Git
• Microservices management
• Continuous Fixing
• Legacy Code Management

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