Let's Learn Git

A 20 minute dive into git.

1. Let's Learn Git MidCamp 2015 #midcamp
2. Alina Mackenzie University of Illinois at Chicago alimac
3. Storytelling Photo by , Flickr.com Suzanne Koch
4. Version control record changes revert to an earlier state tell a story Photo by , Flickr.com Annadriel
5. Writing stories about our projects with git Photo by , Flickr.com Annadriel
6. Distributed vs centralized Photo by , Flickr.com Susanne Nilsson
7. Centralized Photo by , Flickr.com | Diagram by , git­scm.com Susanne Nilsson Scott Chacon and Ben Straub
8. Distributed Photo by , Flickr.com | Diagram by , git­scm.com Susanne Nilsson Scott Chacon and Ben Straub
9. Hosting GitHub  BitBucket  GitLab Photo by , Flickr.com Susanne Nilsson
10. Commands or app Commandline Mac, Windows, Linux, Solaris Apps SourceTree GitHub for SmartGit        Photo by , Flickr.com Bill Gracey
11. SourceTree
12. Configure Scope 1. system 2. user (global) 3. directory (local)    Photo by , Flickr.com Daniel
13. Name and email g i t c o n f i g - - g l o b a l u s e r . n a m e " A l i n a M a c k e n z i e " g i t c o n f i g - - g l o b a l u s e r . e m a i l h e l l o @ a l i m . a c Photo by , Flickr.com Daniel
14. Show configuration g i t c o n f i g - l u s e r . n a m e = A l i n a M a c k e n z i e u s e r . e m a i l = a l i m k n z @ g m a i l . c o m Photo by , Flickr.com Daniel
15. Try these g i t c o n f i g - - g l o b a l c o l o r . u i t r u e c o r e . e x c l u d e s f i l e / U s e r s / a l i m a c / . g i t i g n o r e c o r e . w h i t e s p a c e t r a i l i n g - s p a c e Photo by , Flickr.com Daniel
16. The setting local repository a project folder on my computer remote repository repository that multiple people contribute to Photo by , Flickr.com El Condor
17. Packing list 1. packing­list 2. README.md 3. Contents of README.md   # P a c k i n g L i s t P a c k i n g l i s t f o r t r i p s . Photo by , Flickr.com El Condor
18. Create repository .git/ hidden folder where your repository's snapshots and history are stored c d p a c k i n g - l i s t g i t i n i t I n i t i a l i z e d e m p t y G i t r e p o s i t o r y i n / U s e r s / a l i m a c / p a c k i n g - l i s t / . g i t / Photo by , Flickr.com El Condor
19. Phases Untracked Git sees it, but doesn't know about it. Tracked Git knows about it and tracks changes. Staged Changes are ready to be commited. Committed Changes to the file are saved to history. Pushed Changes are pushed to remote repository. Photo by , Flickr.com Luis Argerich
20. Three sidekicks "Where am I?" "What is going on?" "What did I just do?" Photo by , Flickr.com christina robinson
21. Status Where am I? g i t s t a t u s O n b r a n c h m a s t e r I n i t i a l c o m m i t U n t r a c k e d f i l e s : ( u s e " g i t a d d < f i l e > . . . " t o i n c l u d e i n w h a t w i l l b e c o m m i t t e d ) R E A D M E . m d n o t h i n g a d d e d t o c o m m i t b u t u n t r a c k e d f i l e s p r e s e n t ( u s e " g i t a d d " Photo by , Flickr.com christina robinson
22. Status g i t a d d R E A D M E . m d g i t s t a t u s O n b r a n c h m a s t e r I n i t i a l c o m m i t C h a n g e s t o b e c o m m i t t e d : ( u s e " g i t r m - - c a c h e d < f i l e > . . . " t o u n s t a g e ) n e w f i l e : R E A D M E . m d Photo by , Flickr.com christina robinson
23. README.md  # P a c k i n g L i s t P a c k i n g l i s t f o r t r i p s . * l a p t o p * s k i r t w i t h p o c k e t s * t o o t h b r u s h Photo by , Flickr.com christina robinson
24. Status O n b r a n c h m a s t e r I n i t i a l c o m m i t C h a n g e s t o b e c o m m i t t e d : ( u s e " g i t r e s e t H E A D < f i l e > . . . " t o u n s t a g e ) m o d i f i e d : R E A D M E . m d C h a n g e s n o t s t a g e d f o r c o m m i t : ( u s e " g i t a d d < f i l e > . . " t o u p d a t e w h a t w i l l b e c o m m i t t e d ) ( u s e " g i t c h e c k o u t - - < f i l e > . . . " t o d i s c a r d c h a n g e s i n w o r k i n g d i r e c t o r y ) m o d i f i e d : R E A D M E . m d Photo by , Flickr.com christina robinson
25. Diff What's going on? g i t d i f f d i f f - - g i t a / R E A D M E . m d b / R E A D M E . m d i n d e x d a a 8 d 6 0 . . d a 0 a 4 b 2 1 0 0 6 4 4 - - - a / R E A D M E . m d + + + b / R E A D M E . m d @ @ - 1 , 3 + 1 , 7 @ @ # P a c k i n g L i s t P a c k i n g l i s t f o r t r i p s . + + * l a p t o p + * s k i r t w i t h p o c k e t s + * t o o t h b r u s h Photo by , Flickr.com christina robinson
26. Let's make history g i t c o m m i t - m " I n i t i a l c o m m i t . " [ m a s t e r ( r o o t - c o m m i t ) 1 c 5 0 e b 4 ] I n i t i a l c o m m i t . 1 f i l e c h a n g e d , 3 i n s e r t i o n s ( + ) c r e a t e m o d e 1 0 0 6 4 4 R E A D M E . m d Photo by , Flickr.com christina robinson
27. log What just happened? g i t l o g c o m m i t b 9 f d 7 5 9 6 e 4 4 0 5 1 a 9 9 b 6 8 3 a 1 9 9 8 2 c 5 9 2 f d c b c a 5 a 5 A u t h o r : A l i n a M a c k e n z i e < h e l l o @ a l i m . a c > D a t e : W e d M a r 8 1 2 : 1 0 : 2 5 2 0 1 5 - 0 5 0 0 I n i t i a l c o m m i t . Photo by , Flickr.com christina robinson
28. Commit "A set of related and reversible changes that function together as a unit of work." Photo by , Flickr.com Kathleen Typer­Conklin
29. Interactive staging git add ­p Asks which changes to stage
30. README.md  # P a c k i n g L i s t P a c k i n g l i s t f o r t r i p s . # # T e c h n o l o g y * l a p t o p # # C l o t h e s * s k i r t w i t h p o c k e t s # # T o i l e t r i e s * t o o t h b r u s h Photo by , Flickr.com christina robinson
31. git add -p d i f f - - g i t a / R E A D M E . m d b / R E A D M E . m d i n d e x d a 0 a 4 b 2 . . 9 e 7 7 5 a 7 1 0 0 6 4 4 - - - a / R E A D M E . m d + + + b / R E A D M E . m d @ @ - 2 , 6 + 2 , 1 1 @ @ P a c k i n g l i s t f o r t r i p s . + # # T e c h n o l o g y * l a p t o p + + # # C l o t h e s * s k i r t w i t h p o c k e t s + + # # T o i l e t r i e s * t o o t h b r u s h S t a g e t h i s h u n k [ y , n , q , a , d , / , s , e , ? ] ? Photo by , Flickr.com christina robinson
32. Split S t a g e t h i s h u n k [ y , n , q , a , d , / , s , e , ? ] ? s S p l i t i n t o 3 h u n k s . @ @ - 2 , 4 + 2 , 5 @ @ P a c k i n g l i s t f o r t r i p s . + # # T e c h n o l o g y * l a p t o p S t a g e t h i s h u n k [ y , n , q , a , d , / , j , J , g , e , ? ] ? Photo by , Flickr.com christina robinson
33. Commit message g i t c o m m i t S h o r t d e s c r i p t i v e s u b j e c t l i n e . L o n g e r d e s c r i p t i o n i n t h e f o r m o f p a r a g r a p h s t h a t i n c l u d e r e a s o n s f o r t h e c h a n g e , r e f e r e n c e t i c k e t s o r o t h e r c o m m i t s . Photo by , Flickr.com christina robinson
34. Push Add a remote repository Push commits to remote repository g i t a d d r e m o t e o r i g i n g i t @ b i t b u c k e t . o r g : a l i m a c / p a c k i n g - l i s t . g i t g i t p u s h - u o r i g i n m a s t e r Photo by , Flickr.com christina robinson
35. Undo Not committed yet? unstage a file g i t r e s e t H E A D R E A D M E . m d g i t r e s e t - p undo all changes to a file g i t c h e c k o u t - - R E A D M E . m d Photo by , Flickr.com Melissa Hincha­Ownby
36. Committed but not pushed? update last commit stage or unstage files as you normally would g i t c o m m i t - - a m e n d undo last commit g i t r e s e t - - s o f t H E A D ~ 1 g i t r e s e t H E A D ~ 1 (unstage, too) Photo by , Flickr.com Melissa Hincha­Ownby
37. More than one commit? undo last 3 commits g i t r e s e t - - s o f t H E A D ~ 3 g i t r e s e t H E A D ~ 3 undo a specific commit g i t r e v e r t 6 1 7 f f 1 5 3 Photo by , Flickr.com Melissa Hincha­Ownby
38. Pushed? Don't do it. But if you have to... ... and you are the only contributor g i t p u s h - - f o r c e < r e m o t e > < b r a n c h > Photo by , Flickr.com Melissa Hincha­Ownby
39. Branch cheap way to create copies of the project multiple copies in one directory easy to merge  Photo by , Flickr.com lamoix
40. Create branch g i t b r a n c h t e s t i n g Photo by , Flickr.com | Diagram by , git­scm.com lamoix Scott Chacon and Ben Straub
41. Switch to branch g i t c h e c k o u t t e s t i n g Photo by , Flickr.com | Diagram by , git­scm.com lamoix Scott Chacon and Ben Straub
42. Make commits to testing branch Photo by , Flickr.com | Diagram by , git­scm.com lamoix Scott Chacon and Ben Straub
43. Switch back to master branch g i t c h e c k o u t m a s t e r Photo by , Flickr.com | Diagram by , git­scm.com lamoix Scott Chacon and Ben Straub
44. Merge merge testing into master g i t c h e c k o u t m a s t e r g i t m e r g e t e s t i n g Photo by , Flickr.com Nige Harris
45. Fast-forward merge Replay commits of one branch onto another Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
46. Recursive merge Branches have diverged Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
47. Merge commit Tie two branch endpoints Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
48. Rebase merge without a merge commit rewrites history changes commit hashes Photo by , Flickr.com Leo Reynolds
49. Divergent branches Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
50. Rebase g i t c h e c k o u t e x p e r i m e n t g i t r e b a s e m a s t e r Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
51. Fast-forward merge g i t c h e c k o u t m a s t e r g i t m e r g e e x p e r i m e n t Photo by , Flickr.com | Diagram by , git­scm.com Nige Harris Scott Chacon and Ben Straub
52. Conflict File has been modified in the same place: 1. stops activity (merge, rebase) 2. lists files with conflicts 3. resolve conflicts 4. add (stage) files to continue activity     Photo by , Flickr.com Holger
53. Conflict markers Replace text between markers with your resolution and delete markers. Q u e s t i o n : H o w m a n y p l a n e t s a r e t h e r e i n t h e s o l a r s y s t e m ? < < < < < < < H E A D A n s w e r : e i g h t . = = = = = = = A n s w e r : n i n e . > > > > > > > b r a n c h - a Photo by , Flickr.com Holger
54. Resolve g i t a d d < f i l e > to mark conflict resolved and continue merge or rebase Q u e s t i o n : H o w m a n y p l a n e t s a r e t h e r e i n t h e s o l a r s y s t e m ? A n s w e r : e i g h t . Photo by , Flickr.com Holger
55. Resources Atlassian git tutorials Pro Git book atlassian.com/git/tutorials git­scm.com/book/en/v2 Photo by , Flickr.com Moyann Brenn
56. Sprint Sunday 09:00-17:00 UIC SCE Tower, Room 605 750 S. Halsted http://2015.midcamp.org/schedule Learn through contribution Contributors of all skill sets and levels are welcome and encouraged.
57. Feedback http://bit.ly/midcamp-git Alina Mackenzie: alimac #MidCamp #MidCamp Let's Learn Git / Alina Mackenzie