Intro. to Git and Github

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Academy
www.codergv.com
All Rights Reserved
Intro. to Git/GitHub
by Olmo Maldonado
GMG Agency, LLC
February 5th, 2015

Academy www.codergv.com • All Rights Reserved
Instructor: Olmo Maldonado
➔Over 10 years of experience as Software Engineer
➔Masters in Electrical Engineering from UCLA
➔Founder Tech Tuesdays, Code#RGV
➔MooTools Developer
➔Ex-Googler with Google Photos Team, circa 2009
➔Fluent in JavaScript, PHP, and many more web
tech
Contact & Follow
{facebook, twitter, github}.com/ibolmo

What is Version Control?
➔We use “Version Control” already
◆Ctrl-Z
◆Copy & Paste Files (plus rename), or email copies
◆Dropbox, review history
◆Google Docs, File revision history
V1
Blank
V2
V3
Ctrl-Z
Blank
V1
V2 - Bob
V3 - Bob
Email Bob a copy.

Complexities in Version Control
A.Must retain as much
history as possible
without loss to the data.
B.Must help with working
with others.
C.Must allow
manipulation/playback
of the history.
V1
Blank
V3
Vn
V2
A.
Blank
V1 - You
V2 - Bob
V3 - merged
VnB.
Blank
V2
V2+
V2++
Blank
V1
V2
V1++
C.
V1
V1+

Why Version Control: Flexiblity

Why Version Control: Power
Releases
(proofs)

Why Version Control: Blame

Why Version Control: Analysis
gitinspector.googlecode.com
github.com/mbostock/d3/graphs/contributors

Why Version Control: Independence

industries that should/uses V.C.
➔Medical: Treatment plans and med. history
➔Architecture: Multiple designers, one goal
➔Graphic Design: For those pesky clients
➔Accounting: For auditing
➔Software Dev. (of course): For collab.
➔Government: who was involved, what changed
➔Bottom line: Anyone/Everyone
https://github.com/unitedstates/congress
govtrack.us

What is Git?
It’s a version control system. Sorry, this is a fundamentals class.
For now, you can read for technical details:
http://git-scm.com/book/en/v2/Getting-Started-Git-Basics
Simply:
➔most adopted
➔fast … extremely fast
➔simple(r) to use compared to previous art
➔you can run Git on any platform
➔you don’t need GitHub, or any other service, to
benefit from Git

Google Trends of Git vs others

What is GitHub?
➔a hosted service on top of Git
➔simplifies collaboration
➔most popular; used by Google, Facebook,
Microsoft, and most startups (including
Code#RGV: github.com/codergv)
➔Free for Open Source projects (public)
➔Reasonable costs ($7/mo) for private projects

Google Trends of GitHub vs ...

Let’s get working
Warning, the following may cause eyes to glaze.
Feel free to stop me, and ask questions.

Git/Github Workflow
➔Find/search for projects (and people)
➔Follow project and people
➔Create projects, and upload (push) changes
➔Repeat all of the above

Find/search for Projects
➔Use keywords/search terms
➔Lookup most popular/trending projects by
language
➔Don’t forget to evaluate the project
◆Number of stars (bookmarks)
◆Number of people watching (usually contributors)
◆Look at graphs and see if they’re consistent
➔Adv. Search Operators
◆https://github.com/search/advanced

https://github.com/search?q=3d

https://github.com/iojs/io.js/graphs/contributors

https://github.com/search?q=location%3AMcAllen

github.com/ibolmo?tab=activity

➔Follow people
➔Star (bookmark/like) projects
➔Watch projects get notifications on issues,
changes, or comments
➔Go to github.com/explore everyday, or sign-up
for newsletter
Encouraged to

First …
➔Setup Git
◆https://help.github.com/articles/set-up-git
➔Setup Git ↔ Github Authentication
◆help.github.com/articles/caching-your-github-password-in-git
Create a Project (on GitHub)

github.com/new

github.com/ibolmo/github-demo

(aside) Create a Git REpo. (local)

Git Commands Explained
Sorry, see presentation for additional explanation or
learn more about git init, status, add, commit, etc.
➔See: http://git-scm.com/docs
➔man git (in a command prompt or terminal)

Working with the Repository
> git clone https://github.com/ibolmo/github-demo.git
> cd github-demo
> echo 'Hello World!' >> README.md # append text
> git status
> git add README.md
> git commit
> git log
> # continue making changes, and committing.
> gitk # may need to install gitk, or `open -a 'gitx'`
> git push origin master # to be discussed

➔Default branch name. Just a label.
➔You can have as many branches as you’d like.
➔Their purpose is to allow you to work
independently.
➔Best practice:
use a branch that is
not your master, and merge.
➔See:
guides.github.com/introduction/flow/index.html
Master? WTH are branches?
master
new-feature
fix-bug
redo-ui

Working with Branches
> git branch # find out what branch I’m in
> git checkout -b 'new-branch' # create a new branch
> echo 'Hello from Texas!' >> README.md # append text
> # make changes
> git add README.md
> git commit
> gitk # may need to install gitk, or `open -a 'gitx'`
> git checkout master
> git merge new-branch
> git branch -d new-branch # delete branch

> git merge new-branch # might throw a conflict
> git status # to see what conflicted
> open README.md # edit and resolve conflict
> git status
> git add README.md
> git commit
> git status
Dealing with Conflicts
<<<<< HEAD
This is in the current branch
==========
This is in the other branch
>>>>>> 8a8ecd
Example

git push origin master?git push origin master?
So far we’ve worked locally.
Now it’s time to send your changes (snapshots) to
a remote server (e.g. GitHub).
Origin is again just a label.
Aside
Host your own Git server with Gitolite
http://gitolite.com/gitolite/install.html

Working with Remotes
> git remote # find out what remotes are available
> git remote show origin
> git fetch origin
> git remote -m origin ibolmo # rename label
> git push ibolmo master # upload snapshot(s)
> git pull ibolmo # download snapshot(s)
> git remote add codergv https://github.com/codergv/github-demo
> git remote
> git checkout ibolmo/new-branch # use remote branch (temp)
> git checkout -b olmos-branch # make a local branch

Using branches and remotes to collaborate.
See: http://nvie.com/posts/a-successful-git-branching-model/

➔Find a project, and fork it.
➔It’s cool. Everyone’s doing it.
➔Get your own copy of the repo.
➔You have complete control.
➔When ready, you will create a Pull
Request to contribute back.
➔Follow style guide and contributing
guidelines.
Working with Others on GitHub

Just as Before
> git clone https://github.com/ibolmo/getting-started.git
> cd getting-started
> # make changes
> git add # files
> git commit
> git remote # optional, if you want to check
> git push origin master
> ####
> # instead now on GitHub do a Pull Request

Compare your master with the original master

You can select the exact branch, and see what would be included for the PR.

Give a title, and description, of the PR. See if able to easily merge.

From the originator’s perspective.

Use GitHub for Mac https://mac.github.com/

Github for Windows https://windows.github.com/

Homework
Post updates/questions to Code#RGV Forum, or use
#codergv #academy #hw in tweets and posts
1. Fork github.com/codergv/getting-started
2. Add a useful tip for those getting started
3. Send a Pull Request

Intro. to Git and Github

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