The Foundations of Collaboration with GitHub • SIGCSE 2014

A foundation of collaboration presented to the delegates of SIGCSE
2014 Version control with

Matthew.... @matthewmccull ‣Open source contributor ‣O'Reilly Git Video Co-instructor ‣Co-Author
of O'Reilly's Git book ‣5-year Git trainer ‣Instructor at GitHub

http://oreil.ly/ogitvid

http://amzn.to/oreillygit

Version Control A refreshed approach to VCS

Open Source

bash scripts ☛ C code

is not a slightly better

http://git-scm.com

Starting Up Creating a repository

Get a GitHub account.

Get a GitHub account. http://github.com/join

Create a new repo(sitory).

Add a ﬁle.

View the commit history (timeline).

Make changes to the ﬁle.

Repo Creation Local and remote initialization simplicity

# Green field project! $ git init newproject! $ cd
newproject! # ...start coding

or if you already have source code

# Legacy project tree! $ cd existingproject! $ git init!
! # Add all the code! $ git add .! $ git commit -m”Initial import” 

‣ Blob ‣ Tree ‣ Commit ‣ Tag

tree tree: 7e8b1 web blob: 9ab16 index.html a10b3 tree blob:
8d162 logo.jpg blob: 51d22 draw.js 7e8b1 commit tree: a10b3 parent: nil author: Fird committer: Matthew message: Major refactoring of the web content. c67db blob <html> <body></body> </html> 9ab16 blob //Some more javascript var renderSize 51d22 blob 7D 8D B3 7F BD 12 9F E9 7B 78 9D 3F 5C A6 72 CB 8d162

Collaborating Two authors

Make simultaneous changes to the ﬁle.

Collaborating Redux Untrusted collaborators

Untrusted changes to the ﬁle.

Changelist Three stage thinking

Working Staging Repo add commit edit

‣shopping cart ‣ put things in ‣ take things out
‣ purchase at register

v1 v2 v3 v4 File A File B File C
File A File B File B File C v5 File A File B File B File A File A File C File C File C

Workspaces The power of simple branch toggling

Local Remote Upstream

# Creating a branch! git branch <BRANCHNAME>

RELEASE_1.0 HEAD bug979branch commit c67db commit 9bd21 commit 1c2d7 commit
8c2d1 commit 1bdcd commit 2daa1

What do cheap branches enable?

‣ Experimentation ‣ 

‣ Experimentation ‣ Safe experimentation

Better reuse of units of work

Work Models Enabling different development styles

product v1.0 integration story1 story2 v1.5 integration story3

Local Remote Upstream Integ Product Integ Product Integ Product

Local Remote Upstream Idea Story Feature Feature Feature Integ Product
Integ Product Integ Product

Central Repo C e n t r a l i
z e d

Blessed Repo D i c t a t o r
s h i p

Certiﬁed Repo Development Repo t e g r a t
i o n M a n a g e d Continuous  Integration  Server

C u s t o m + P u b
l i c C o n t r i b Customized ☚ Private Public ☛ GitHub

Mirror Development Repo M i r r o r e
d Mirror Certiﬁed Repo

Client Apps GUIs and other front-ends

http://windows.github.com

http://mac.github.com

Remotes Bandwidth and geographic challenges

Local Remote Upstream

data from http://whygitisbetterthanx.com/#git-is-fast Init git svn Status git svn Diff
git svn Tag git svn Log git svn Commit (Lg) git svn Commit (Sm) git svn Branch git c svn c Speed

Local Remote Upstream commit fetch push clone clone clone push
pull pull pull

Commit Push Pull

Integration CI, scripting, and hooks

"This is so important, we can't entrust it to automation.
We need our top developer to supervise it."

continuous integration servers jenkins travis ci circleci buildhive

Summary The Git and GitHub ecosystem

education@github.com education.github.com @matthewmccull Q&A

• http://education.github.com • education@github.com  • http://git-scm.com/book • http://training.github.com Resources

The Foundations of Collaboration with GitHub • ...

The Foundations of Collaboration with GitHub • SIGCSE 2014

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