The document details a presentation about Gerrit, a web-based code review software used in the TYPO3 project, aimed at enhancing quality assurance in software development. It outlines the architecture of Git with Gerrit and the benefits of using Gerrit for code reviews, emphasizing the importance of collaborative review processes to identify bugs and ensure code quality. Additionally, it provides practical instructions for setting up a Gerrit environment and pushing changes to the repository.

1. Developer Days München
12. - 15. April 2012
Making you a GIT hero
Part 3/3: Gerrit

2. Developer Days München
12. - 15. April 2012
Your Presenter
Hi,
I’m Steffen!
Please give me feedback
about this presentation!
steffen.gebert@typo3.org
@StGebert on Twitter

3. Developer Days München
12. - 15. April 2012
I live in Würzburg
Studied Computer science there
Photo by Juergen Mangelsdorf (CC)
http://www.flickr.com/photos/22084572@N07/2217991811/

4. Developer Days München
12. - 15. April 2012
Day-to-day Job
Now PhD student and researcher
• Network and Cloud Security
• Core Network Routing
Photo by Paul Soler-Moya (CC)
http://www.flickr.com/photos/40351463@N00/3927504524/

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12. - 15. April 2012
TYPO3 Core Team Member

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TYPO3.org Server Admin Team Member

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Questions!
• Who already worked with Git (besides yesterday/today)?
• Who already worked with Gerrit?
• Who already has a Gerrit setup?
• Who knows, what Gerrit is?

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What’s Gerrit?
• Gerrit is for Quality Assurance!
• Make sure that the author does it

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12. - 15. April 2012
Preparation
• Please clone the Sandbox project:
git clone --recursive git://git.typo3.org/
Sandbox.git

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About Gerrit
• Web-based Code Review Software
• Git server, SSH server
• Written in Java
• Developed by Google (for Android Development)
• Relies on Git as Version Control System (VCS)
• Gatekeeper in front of the Git repositories
• .. and the reason, why TYPO3 migrated to Git

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12. - 15. April 2012
Git Architecture
Git with Gerrit Architecture

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Gerrit Usage in TYPO3 world
Gerrit is used by
• TYPO3v4/v6
• workspaces, extbase, fluid, .. Subprojects
• FLOW3
• Phoenix
• Few elitist extensions
• news, community, extension_builder
• Working hard on support for community extensions!

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Ages ago...
• Reviews using the TYPO3 Core Team Mailing list

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Reviews through Mailing Lists

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Reviews through Mailing Lists
Keeping track of changes was.. well.. a manual job!

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12. - 15. April 2012
Back to Gerrit!
• that’s where you find it:
• https://review.typo3.org

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12. - 15. April 2012
Software Reviews
• All code contains errors, more or less
• Easier to spot them with four, six, eight, ..., eyes
• No code must be merged without review
• Review types
• Functional review
• Code review

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12. - 15. April 2012
Functional Review
• Make sure that a change
• fixes the bug / implements the feature as advertised
• doesn’t hurt other functionality
• is robust
• Testing methods
• Automatic (Selenium, Unit Test)
• Manual (your browser + your mouse + your brain)

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Code Review
• The change to the code
• is correct (it does, what it should do)
• is well-coded (robust, performant, etc.)
• respects Coding Guide Lines (TYPO3 CGL)
• Testing methods
• Automatic: CGL, Unit tests
• Manual: Reading the code

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Required Votes
• Votings required to merge a change:
Code
Verified
Review
Team
✓ (+2) ✓ (+2)
Member
Anyone +1 +1
• More reviews are welcome!
• Merging happens by team member pressing a “Submit”

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12. - 15. April 2012
Git Help
• The best™ Git Documentation ever:
• http://wiki.typo3.org/Git
• Please set up the Gerrit commit hook
• Contribution Walkthrough with Command Line

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Pushing a Change to Gerrit
git push origin HEAD:refs/for/<release-branch>
the remote to push to
(could be also github, etc.)

23. Developer Days München
12. - 15. April 2012
Pushing a Change to Gerrit
git push origin HEAD:refs/for/<release-branch>
state of your pseudo-branch target branch
working tree in Gerrit (master,
TYPO3_4-6)