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Prem Aseem Jain
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Presentation deals Visualizing SVN vs Git Git architecture Delta storage Branching and Rebase Git commands

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Git - Fast Version Control System Presentation By: Aseem Jain
Agenda (apart from fun) • Visualize “GIT Vs SVN” • What is Delta Storage ? • GIT Work Flow • GIT Architecture • Branching • Merge and Rebase • Dictator Model • Getting GIT Remote Repository • Git Help • Demos
Visualize SVN Vs GIT KEY POINTS : SVN is vulnerable to corruption SVN repository should have better backup plans SVN cannot work with low network speed. SVN consumes more space SVN is not scalable if your bases is of 1000s user SVN, if build is failed every one is stuck SVN, if central code is diluted all code fades out SVN, for collaboration code has to be checked in http://www.youtube.com/watch?v=ntTpM8hfl_E&feature=related
What is Delta Storage ? Instead of saving or replacing entire file, only differences are saved and tracked.
Svn is vulnerable Git portability – (Svn corruption problem) to corruption even when the OS or media is not changed. However the git can be ported on daily basis to different media without corruption, it is robust it will be up after 10 years. Animation – P 483 https://github.com/premaseem/precisionlms
Git Architecture • Index – Stores information about current working directory and changes made to it • Object Database – Blobs (files) • Stored in .git/objects • Indexed by unique hash • All files are stored as blobs – Trees (directories) – Commits • One object for every commit • Contains hash of parent, name of author, time of commit, and hash of the current tree – Tags
Git Workflow • Fetch or clone (create a copy of the remote repository) (compare to cvs check out) • Modify the files in the local branch • Stage the files (no cvs comparison) • Commit the files locally (no cvs comparison) • Push changes to remote repository (compare to cvs commit)
Git Local repository add commit Object Working tree Index store (sand box) (cache) pull, push Other Repositories 8
How Git object Database works Entire version history, branch data and content are hashed, compressed and stored locally to make it faster better and easy to share.
Light weight(delta) Branching(context switching) No massive copying can be switched can be local/remote can be shared commit specific branch
Instead of sticking to one central Multiple remote repository repository, git helps to deal with multiple remote repository Refer – p 188
The workflow Dictator model demonstrated here solves the problem of multiple projects working on same codebase. Animation – P 483 https://github.com/premaseem/precisionlms
Getting git remote Getting Git Remote Repository repository which is free. It has simple login, configuratio n than you get the remote location to open you code base to rest of the world for contribution. (Pizz application) Demo https://github.com/premaseem/precisionlms
With SVN you are compelled to Git Merge and Rebase merge and some time gets frustrated to loose or rewrite what you were doing. Git will help you to rebase and continue without distraction Refer – p 213
Blog link for details of git commands : http://premaseem.wordpress.com/2011/11/16/git-commans/ 152 Git Commands
Blog link for details of git commands : http://premaseem.wordpress.com/2011/11/16/git-commans/ GIT – “GUI” Graphic User Interface
Some GIT Disadvantages • Definite learning curve, especially for those used to centralized systems - Can sometimes seem overwhelming to learn  • Documentation mostly through man pages
How to get help with git • Read That Fabulous Manual http://www.kernel.org/pub/software/scm/git/docs/user- manual.html • Books http://progit.org/book/ (free) • Online training: https://github.com/training/online • Git user groups online http://old.nabble.com/git-f12403.html • Git mailing lists git-users@googlegroups.com link: www.premaseem.com/git
Team Question ? ?
To download this presentation visit : www.premaseem.com/git
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Git Presentation

  • 1. Git - Fast Version Control System Presentation By: Aseem Jain
  • 2. Agenda (apart from fun) • Visualize “GIT Vs SVN” • What is Delta Storage ? • GIT Work Flow • GIT Architecture • Branching • Merge and Rebase • Dictator Model • Getting GIT Remote Repository • Git Help • Demos
  • 3. Visualize SVN Vs GIT KEY POINTS : SVN is vulnerable to corruption SVN repository should have better backup plans SVN cannot work with low network speed. SVN consumes more space SVN is not scalable if your bases is of 1000s user SVN, if build is failed every one is stuck SVN, if central code is diluted all code fades out SVN, for collaboration code has to be checked in http://www.youtube.com/watch?v=ntTpM8hfl_E&feature=related
  • 4. What is Delta Storage ? Instead of saving or replacing entire file, only differences are saved and tracked.
  • 5. Svn is vulnerable Git portability – (Svn corruption problem) to corruption even when the OS or media is not changed. However the git can be ported on daily basis to different media without corruption, it is robust it will be up after 10 years. Animation – P 483 https://github.com/premaseem/precisionlms
  • 6. Git Architecture • Index – Stores information about current working directory and changes made to it • Object Database – Blobs (files) • Stored in .git/objects • Indexed by unique hash • All files are stored as blobs – Trees (directories) – Commits • One object for every commit • Contains hash of parent, name of author, time of commit, and hash of the current tree – Tags
  • 7. Git Workflow • Fetch or clone (create a copy of the remote repository) (compare to cvs check out) • Modify the files in the local branch • Stage the files (no cvs comparison) • Commit the files locally (no cvs comparison) • Push changes to remote repository (compare to cvs commit)
  • 8. Git Local repository add commit Object Working tree Index store (sand box) (cache) pull, push Other Repositories 8
  • 9. How Git object Database works Entire version history, branch data and content are hashed, compressed and stored locally to make it faster better and easy to share.
  • 10. Light weight(delta) Branching(context switching) No massive copying can be switched can be local/remote can be shared commit specific branch
  • 11. Instead of sticking to one central Multiple remote repository repository, git helps to deal with multiple remote repository Refer – p 188
  • 12. The workflow Dictator model demonstrated here solves the problem of multiple projects working on same codebase. Animation – P 483 https://github.com/premaseem/precisionlms
  • 13. Getting git remote Getting Git Remote Repository repository which is free. It has simple login, configuratio n than you get the remote location to open you code base to rest of the world for contribution. (Pizz application) Demo https://github.com/premaseem/precisionlms
  • 14. With SVN you are compelled to Git Merge and Rebase merge and some time gets frustrated to loose or rewrite what you were doing. Git will help you to rebase and continue without distraction Refer – p 213
  • 15. Blog link for details of git commands : http://premaseem.wordpress.com/2011/11/16/git-commans/ 152 Git Commands
  • 16. Blog link for details of git commands : http://premaseem.wordpress.com/2011/11/16/git-commans/ GIT – “GUI” Graphic User Interface
  • 17. Some GIT Disadvantages • Definite learning curve, especially for those used to centralized systems - Can sometimes seem overwhelming to learn  • Documentation mostly through man pages
  • 18. How to get help with git • Read That Fabulous Manual http://www.kernel.org/pub/software/scm/git/docs/user- manual.html • Books http://progit.org/book/ (free) • Online training: https://github.com/training/online • Git user groups online http://old.nabble.com/git-f12403.html • Git mailing lists [email protected] link: www.premaseem.com/git
  • 20. To download this presentation visit : www.premaseem.com/git