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Intro to Git and GitHub

This document summarizes a presentation given at DrupalCamp in Athens on December 12, 2010 about Git and GitHub. The presentation introduced Git as a distributed version control system designed for speed and efficiency. It explained some of Git's core concepts like snapshots, branches, merging, and its distributed nature. It also promoted GitHub as a social coding platform that improves collaboration and code hosting for both open source and private projects. The presentation aimed to help attendees learn Git for their own benefit and prepare for Drupal moving to GitHub.

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DrupalCamp, Athens, 12 December 2010 An intro to Git and GitHub Drupal will be soon hosted at GiHub but before that learn Git for your own good and sanity Panagiotis Papadopoulos 6pna / Sfalma @panosjee
Who am I? Freelancer and startuper wannabe. Athens Ruby and GTUG organiser. Not a guru in something. Man of all trades master to none with an inclination towards Ruby, Python, Javascript. Do not ask me Drupal, but I will help drupalists with www.sfalma.com (shameless promo)
Subversion is the most pointless project ever started Linus Torvalds
What is Git? Git is a distributed revision control system with an emphasis on speed. Git was initially designed and developed by Linus Torvalds for Linux kernel development. Every Git working directory is a full-fledged repository with complete history and full revision tracking capabilities, not dependent on network access or a central server. Git's current software maintenance is overseen by Junio Hamano. Git is free software distributed under the terms of the GNU General Public License version 2. If Git is a heavenly tool, GitHub is a programmer 's heaven. - PanosJee, December 12th 2010 Source: http://en.wikipedia.org/wiki/Git_(software)
Git is distributed panosjee jonromero savvas doxaras
Git is a very simple beast! Git is: Distributed Non linear development Efficient very small footprint Consists of Git objects which are the actual data of Git, the main thing that the repository is made up of. The four main objects of Git are blobs, trees, commits and tags. A Git object is a file in the repository compressed (with Zlib) and referenced by the SHA-1 value of its contents plus a small header. The contents of a file are stored as blobs.
The Git model (1) A simple repo with the following Commands structure: $ git init . $ git add . $ git commit -m "first commit" - module - init.php -- includes - definitions.php -- lib - model.php Example from the excellent http://peepcode.com/products/git-internals-pdf
The Git model (2) A simple repo with the following Commands structure: $ git tag "first tag" $ mkdir validators $ touch email.php $ git add . - module $ git commit -m "added validators" - init.php -- includes - definitions.php -- lib - model.php -- validators - email.php Example from the excellent http://peepcode.com/products/git-internals-pdf
The Git model (3) A simple repo with the following structure: - module - init.php -- includes - definitions.php -- lib - model.php * -- validators - email.php Commands $ vim model.php $ git add . $ git commit -m "include validators" Example from the excellent http://peepcode.com/products/git-internals-pdf
The Git model (4) A simple repo with the following structure: - module - init.php -- includes - definitions.php -- lib - model.php -- validators - email.php Example from the excellent http://peepcode.com/products/git-internals-pdf
Git is snapshot based Multiple parents 1 2 $ git commit -m "new commit" Easy branching 1 2 3 $ git commit -m "new commit" $ git branch 4 4
Git is snapshot based master Easy merging 2 1 1 2 3 5 $ git merge 4 4
The virtues of Git Fork, Clone, Pull, Remote
Git pull. Full control. Remote repos. Made for speed, full visibility in a few lines. You can pull from 1-n remote repos. As we said Git is distributed.
Know thy status What 's untracked. What 's modified. What 's added. What 's deleted. What 's changed.
Git branches carry their history Once you clone a Git repo you have complete access to all previous versions. For ever.
Git stash Real life scenario. You are working on your code and your colleagues just pushed a very important fix that you needed. You cannot pull changes if you have not commited your code, but you should not commit as you are still experimenting. What do you do ? Just put your changes aside (git stash) get your friends changes (git pull) and then apply your changes that you had pust aside (git stash apply). Neat?
Commit to Open Source in a breeze The distributed nature of Git The procedure is simple: means you can work locally 1. Find an open source project 2. Fork it on code and push to a 3. Clone (download locally) remote repository when 4. Do your changes ready. 5. Push to your remote This is perfect for teams and Wanna have your changes Open Source projects. merged into initial repo? 1. Do a pull request 2. Hope the author accepts it
$ tools “The bad workman blames his tools” American Proverb “We shape our tools and afterwards our tools shape us.” Marshall McLuhan The best tool you need is to learn the internals of Git you can understand how it works. The second best tool is the command line. Master it. You will never look back. Git integrates with various IDEs like Eclipse, NetBeans. There are also great standalone Git apps.
Tower - Mac App - Still beta - Impressive
GitX for Mac - GitK for other platforms
GitWeb - Web UI - Shipped with Git
Giggle - Linux
GitHub is the Facebook of Code GitHub is an unparallel tool I am always struck by the that offers you unlimited wealth of project I find on public repos and private GitHub. repos on subscriptions plans. Lots of major open source projects are there for you to Github is: use and study. 1. Collaboration tool Fork them, change them, 2. Code host contribute in no time. 3. Wiki 4. Issue tracker 5. Code review tool If you are a coder and you 6. Git UI have never used GitHub you 7. Social probably live in a parallel universe :P
GitHub Network Graph Viewer
Questions? You may also use Mercurial, Fossil, Bazaar but Mercurial and Git are the winners :P http://bit.ly/git-dcath

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In this document
Powered by AI

Introductory presentation on Git and GitHub by Panagiotis Papadopoulos, discussing Git's relevance.

Git as a distributed revision control system designed by Linus Torvalds, with emphasis on speed and independence.

Git's attributes include being distributed, allowing non-linear development, and having a small footprint.

Demonstrates Git repo structures and related commands for initializing, adding, and committing changes.

Explains Git's snapshot-based model, easy branching, and merging operations between versions.

Overview of Git commands for controlling branches, visibility of statuses, and managing changes.

Real-life scenario for managing code with git stash, allowing temporary saving of changes.

Procedure for contributing to open source using Git, emphasizing the importance of collaboration.

Emphasizes learning Git's internals, command line mastery, and availability of various Git tools and applications.

Highlights GitHub's key features as a collaboration tool and importance for open source projects.

Wrap-up with an encouragement for questions and mentioning other version control systems.

Intro to Git and GitHub

  • 1.
    DrupalCamp, Athens, 12December 2010 An intro to Git and GitHub Drupal will be soon hosted at GiHub but before that learn Git for your own good and sanity Panagiotis Papadopoulos 6pna / Sfalma @panosjee
  • 2.
    Who am I? Freelancerand startuper wannabe. Athens Ruby and GTUG organiser. Not a guru in something. Man of all trades master to none with an inclination towards Ruby, Python, Javascript. Do not ask me Drupal, but I will help drupalists with www.sfalma.com (shameless promo)
  • 3.
    Subversion is themost pointless project ever started Linus Torvalds
  • 4.
    What is Git? Gitis a distributed revision control system with an emphasis on speed. Git was initially designed and developed by Linus Torvalds for Linux kernel development. Every Git working directory is a full-fledged repository with complete history and full revision tracking capabilities, not dependent on network access or a central server. Git's current software maintenance is overseen by Junio Hamano. Git is free software distributed under the terms of the GNU General Public License version 2. If Git is a heavenly tool, GitHub is a programmer 's heaven. - PanosJee, December 12th 2010 Source: http://en.wikipedia.org/wiki/Git_(software)
  • 5.
    Git is distributed panosjee jonromero savvas doxaras
  • 6.
    Git is avery simple beast! Git is: Distributed Non linear development Efficient very small footprint Consists of Git objects which are the actual data of Git, the main thing that the repository is made up of. The four main objects of Git are blobs, trees, commits and tags. A Git object is a file in the repository compressed (with Zlib) and referenced by the SHA-1 value of its contents plus a small header. The contents of a file are stored as blobs.
  • 7.
    The Git model(1) A simple repo with the following Commands structure: $ git init . $ git add . $ git commit -m "first commit" - module - init.php -- includes - definitions.php -- lib - model.php Example from the excellent http://peepcode.com/products/git-internals-pdf
  • 8.
    The Git model(2) A simple repo with the following Commands structure: $ git tag "first tag" $ mkdir validators $ touch email.php $ git add . - module $ git commit -m "added validators" - init.php -- includes - definitions.php -- lib - model.php -- validators - email.php Example from the excellent http://peepcode.com/products/git-internals-pdf
  • 9.
    The Git model(3) A simple repo with the following structure: - module - init.php -- includes - definitions.php -- lib - model.php * -- validators - email.php Commands $ vim model.php $ git add . $ git commit -m "include validators" Example from the excellent http://peepcode.com/products/git-internals-pdf
  • 10.
    The Git model(4) A simple repo with the following structure: - module - init.php -- includes - definitions.php -- lib - model.php -- validators - email.php Example from the excellent http://peepcode.com/products/git-internals-pdf
  • 11.
    Git is snapshotbased Multiple parents 1 2 $ git commit -m "new commit" Easy branching 1 2 3 $ git commit -m "new commit" $ git branch 4 4
  • 12.
    Git is snapshotbased master Easy merging 2 1 1 2 3 5 $ git merge 4 4
  • 13.
    The virtues ofGit Fork, Clone, Pull, Remote
  • 14.
    Git pull. Fullcontrol. Remote repos. Made for speed, full visibility in a few lines. You can pull from 1-n remote repos. As we said Git is distributed.
  • 15.
    Know thy status What 's untracked. What 's modified. What 's added. What 's deleted. What 's changed.
  • 16.
    Git branches carrytheir history Once you clone a Git repo you have complete access to all previous versions. For ever.
  • 17.
    Git stash Real lifescenario. You are working on your code and your colleagues just pushed a very important fix that you needed. You cannot pull changes if you have not commited your code, but you should not commit as you are still experimenting. What do you do ? Just put your changes aside (git stash) get your friends changes (git pull) and then apply your changes that you had pust aside (git stash apply). Neat?
  • 18.
    Commit to OpenSource in a breeze The distributed nature of Git The procedure is simple: means you can work locally 1. Find an open source project 2. Fork it on code and push to a 3. Clone (download locally) remote repository when 4. Do your changes ready. 5. Push to your remote This is perfect for teams and Wanna have your changes Open Source projects. merged into initial repo? 1. Do a pull request 2. Hope the author accepts it
  • 20.
    $ tools “The badworkman blames his tools” American Proverb “We shape our tools and afterwards our tools shape us.” Marshall McLuhan The best tool you need is to learn the internals of Git you can understand how it works. The second best tool is the command line. Master it. You will never look back. Git integrates with various IDEs like Eclipse, NetBeans. There are also great standalone Git apps.
  • 21.
    Tower - MacApp - Still beta - Impressive
  • 22.
    GitX for Mac- GitK for other platforms
  • 23.
    GitWeb - WebUI - Shipped with Git
  • 24.
  • 26.
    GitHub is theFacebook of Code GitHub is an unparallel tool I am always struck by the that offers you unlimited wealth of project I find on public repos and private GitHub. repos on subscriptions plans. Lots of major open source projects are there for you to Github is: use and study. 1. Collaboration tool Fork them, change them, 2. Code host contribute in no time. 3. Wiki 4. Issue tracker 5. Code review tool If you are a coder and you 6. Git UI have never used GitHub you 7. Social probably live in a parallel universe :P
  • 30.
  • 31.
    Questions? You may alsouse Mercurial, Fossil, Bazaar but Mercurial and Git are the winners :P http://bit.ly/git-dcath