GIT as the Distributed Version Control System and as a Way of Life

DBS ITT Lunch and Learn Tech Sharing May 2014

Speakers

1. GIT as the Distributed Version Control System and as a Way of Life by Steve Teo

Transcript

1. DBS ITT Lunch & Learn Tech Sharing http://teamsite.1bank.dbs.com/sites/RTT/TST 8th May 2014
2. What is this all about? - Once a month lunchtime session - Focus on the learning and sharing of technology - Open to all folks who have a kin interest
3. What is the session format? - Talks (Short/Long) - Lightning Talks (5 mins) - Anything else you can think of
4. How did this come about? - Lack of a platform for learning/sharing of technology - My experience with tech meetups, conferences, etc. - Some encouragement from the folks around me
5. What is the grand vision? - To build a community of folks who are aware and excited about technology
6. What is in it for us? - Fosters learning and growth - Community & Networking - Ideas, Inspirations, Collaboration
7. What can people talk on? - Anything to do with technology - Something you have been up to - Something your team has been up to - Cool hacks - Anything else you can think of
8. How can you contribute? - Be a speaker - Be a co-organiser - Be an attendee - Let others know about this - Give useful feedback - Anything else you can think of
9. Intranet Sharepoint http://teamsite.1bank.dbs.com/sites/RTT/TST
10. Intranet Sharepoint - Lunch and Learn Sessions - External Tech Meetups - Interesting Articles - Anything else you can think of
11. Moving on to the session
12. Git As the Distributed Version Control System As a Way of Life By Steve Teo
13. Quick Survey - How many of you use a VCS in their daily work? - How many of you know the difference between a CVCS and a DVCS? - How many of you know/use Git/Mercurial?
14. Motivation for this Talk - Been through almost every VCS in the following order No VCS -> SVN -> Mercurial -> GIT -> CVS, Clearcase This is how I feel nowadays when I have to work with a centralized VCS or no VCS
15. Motivation for this Talk - Creating GIT guide while mentoring for NUS Computing CS2103 Software Engineering - DVCS Research Topic for NUS Computing CS4217 Software Development Technologies https://sites.google.com/site/cs4217jan2011team7/home
16. GIT Introduction - Created by Linus Torvalds (Linux Fame) in 2005 - Free and Open Source http://git-scm.com/ - Most recognized Distributed Version Control System due to https://github.com/ - Used by almost all new modern open-source (and increasingly, close-sourced) projects today - More info: http://en.wikipedia.org/wiki/Git_(software)
17. Linus's Motivation 2:20  /  1:10:15 Tech  Talk:  Linus  Torvalds  on  git
18. Random April Fool's Joke http://www.infoq.com/news/2014/04/svn-migrates-to-git
19. Winning Features http://git-scm.com/about/ - Distributed - Consistency assurance - Branch and Merge with no Fear (The way software is supposed to be done)
20. Think Distributed Baby!
21. Think Distributed! - Commits done locally, anywhere, anytime - Push, pull when ready - If your central repository goes down, no sweat if someone else has a copy - Lightning fast VCS operations!
22. Think Implications! - Everyone has their own repository, there is no 'default' centralized repository
23. Think Implications! - Team members must be disciplined to commit and pull/push regularly - Need to look at your/team development requirements and come up with a usable and realistic workflow/branching model
24. Think Workflows! - Decide on a workflow which you can use. - For most projects transiting over from a CVCS, the centralized workflow is what you should be looking for. - Easy to convert to another workflow later if needed. http://git-scm.com/book/en/Distributed-Git-Distributed-Workflows https://www.atlassian.com/git/workflows#!workflow-overview
25. Think Branching Models! - GitFlow (For serious projects with a fairly long release cycle) http://nvie.com/posts/a-successful-git-branching-model/ https://github.com/nvie/gitflow - GitHub Flow (For projects enabled by continous delivery) http://scottchacon.com/2011/08/31/github-flow.html https://guides.github.com/introduction/flow/index.html
26. Consistency Assurance - SHA1 Hashing all the way down (even Commits are identified by hashes) - Corruptions/Malicious Intent on repositories can be detected - Assurance that what you commited 5 years ago will still be the same when you check it out
27. Branch and Merge with no Fear - Branching and Merging are done locally and lightning fast! - Merge tracking better than anything out there - All these is due to a superior underlying architecture. GIT is fundamentally a content-addressable filesystem. - Highly recommended to read this excellent open-source book if you want to know how GIT works internally and why operations are so fast and reliable. https://github.com/pluralsight/git-internals-pdf
28. How to get GIT? Supported on all major OSes (Windows, OSX, Linux, Solaris) Download links on http://git-scm.com/ - Official Windows msysgit project: http://msysgit.github.io/ - Mac: comes default, update via homebrew or download if necessary - Linux: depends on distro. Use a suitable package manager
29. GIT Clients - Official List: http://git-scm.com/downloads/guis - Master the command line - SmartGIT (Java Cross Platform. Free only for non-commercial usage) http://www.syntevo.com/smartgithg/ - GitHub Client (Free. Windows, Mac) https://windows.github.com/ https://mac.github.com/
30. GIT Clients - Atlassian SourceTree (Free. Windows, Mac) http://www.sourcetreeapp.com/ - Ungit (Free. Node.JS App) https://github.com/FredrikNoren/ungit - Look at your IDE/Text Editor and see what it offers
31. How to cloud-host your GIT Repositories? - GitHub (Free for public projects. Paid for private projects) https://github.com/ - Many others!
32. How to self-host your GIT Repositories? - Atlassian Stash (Cheap for small developer teams, startups. Cross-platform) https://www.atlassian.com/software/stash - GitLab (Free community and paid enterprise version. Virtual appliance or self-install) https://www.gitlab.com/ - GitHub Enterprise (Very Expensive, but you will benefit from the GitHub way. Virtual appliance) https://enterprise.github.com/
33. Quick Demo
34. How to get started? - Books: http://git-scm.com/book/en/Getting-Started https://github.com/pluralsight/git-internals-pdf - Slides: http://training.github.com/kit/slides/github-foundations.html#/ - Workshopper Module: http://nodeschool.io/#git-it
35. Some Last Words - GIT is an essential 'bread-and-butter' tool in any Developer's arsenal - If you are not using GIT yet, you are losing out. Entire technology world is moving towards GIT. - Check out GitHub if you haven't yet. https://github.com/ - There is a learning curve (not that steep IMHO), you will 'git' it with everyday use
36. The End - Questions and Answers