Presented at University IT Exploration Conference 2015(UnitExCon) http://unitexcon.juca.hk/

1. The Power of Git
Prepared and Presented
by Dr. Haggen So
Released under Creative Commons Attribution 3.0 Hong Kong Licence

2. Me
President of HKCOTA
PhD Research on
Open Source Collaboration
Tools

3. Hong Kong Creative
Open Technology Association
Open Standards
Free Software and Open Source Software
Open Hardware
Free Culture Works, Open Content and Creative
Commons

4. Problem 1
Finding Old Code

5. Problem 1 (Cont')
I keep good Backups
But Which One?

6. Problem 1 (Cont')
Ref: http://www.slideshare.net/taichunmin/ss-16096723

7. Problem 2
Project Group
Old Files covering New Files?
Several Members Changing the Files?

8. Problem 2 (Cont')
Ref: http://www.slideshare.net/taichunmin/ss-16096723
My Version!
Me First!
Listen to Me!

9. Cloud Storage
+ Online Office Suite
Cloud Storage – Dropbox, OneDrive...
Online Office Suite – Google Doc, Office 365...
●
Some Versioning Functions
●
Collaborative Online Editing

10. Cloud Storage
+ Online Office Suite (Cont')
Which version?
(Annotation)
Collaboration on Source Code?
Offline?

11. Version Control System
Versions stored in Repository
Unique ID
Date
Changes

12. Version Control System (Cont')
Annotation
Author
Summary
Details

13. Version Control System (Cont')

14. Version Control System (Cont')

15. Version Control System
Problem 1 Solved

16. Collaboration
Lock-Modify-Unlock
Pessimistic
vs
Copy-Modify-Merge
Optimistic

17. Lock-Modify-Unlock
Pessimistic

18. Copy-Modify-Merge
Optimistic

19. What did/do the
Free Software/Open Source Community
Choose?

20. 4 Freedoms
• The freedom to run the program, for any
purpose (freedom 0).
• The freedom to study how the program works,
and change it to make it do what you wish
(freedom 1). Access to the source code is a
precondition for this.

21. 4 Freedoms (Cont')
• The freedom to redistribute copies so you can
help your neighbor (freedom 2).
• The freedom to improve the program, and
release your improvements (and modified
versions in general) to the public, so that the
whole community benefits (freedom 3). Access
to the source code is a precondition for this.

22. Maximise
Motivation
Ref.: Karl Fogel, Open Source Development with CVS

23. How to
Further Motivate?

24. Distributed Version
Control System

25. DVCS
Offline Problem
All the functionalities

26. VCS vs DVCS
Version Control Systems
●
CVS
●
Subversion
Distributed VCS
●
Bazaar
●
Git
●
Mercurial

27. Git
Most well-known DVCS
Began in 2005
By Linus Torvalds to support
Linux Kernel Development

28. Online Services for Git
GitHub
BitBucket
GitLab
SourceForge
CodePlex
Etc.
Ref: http://beebom.com/2015/03/github-alternatives

29. The Power of Git
Help you find Old Code
(Problem 1)

30. The Power of Git
Help you Co-ordinate
Source Code in Group Projects
(Problem 2)
(Also Record "Who is the Laziest?")

31. The Power of Git
Has Offline Solution

32. The Power of Git
GitHub
2.2 Million Active Repositories
Ref: http://githut.info/

33. Microsoft Dump CodePlex for Git
Ref: http://www.theregister.co.uk/2015/01/15/codeplex_repository_out
_of_favour_as_microsoft_moves_major_projects_to_github/

34. GitHub Desktop Demo

35. GitHub Desktop Demo (Cont')

36. GitHub Desktop Demo (Cont')