Why we love git (CPOSC 2012)

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The document discusses various aspects of Git including: - How Git allows tracking content across multiple endpoints through commits - The concepts of the working tree, index, HEAD pointer and refs that Git uses to track changes - How to interact with remote repositories through cloning, pulling and pushing - Common Git workflows like feature branches, releases and hotfixes - How Git's immutable branches and ref logs allow rewriting history flexibly while preserving information

Technology

Why We Love Git
Jason May
Wednesday, June 26, 13

Why We Love Git
We can expressively track
content among multiple
endpoints.
Wednesday, June 26, 13

Commits are a form of documentation.
Wednesday, June 26, 13

Checkout states
“HEAD”
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
HEAD
Wednesday, June 26, 13

Checkout states
“HEAD”
The working tree
Wednesday, June 26, 13

Checkout states
$ touch README.txt
Wednesday, June 26, 13

Checkout states
$ touch README.txt
$ git status --short
?? README.txt
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
HEAD
Working tree
Wednesday, June 26, 13

Checkout states
Working tree HEAD
Wednesday, June 26, 13

Checkout states
$ git add README.txt
Wednesday, June 26, 13

Checkout states
$ git add README.txt
$ git status --short
A README.txt
Wednesday, June 26, 13

Checkout states
The Index!
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
HEAD
Index
Wednesday, June 26, 13

Checkout states
Working tree HEADIndex
Wednesday, June 26, 13

Checkout states
$ git commit -m ‘Add README.txt’
Wednesday, June 26, 13

Checkout states
$ git commit
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
HEAD
Index
README.txt
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
Index *commit*
HEAD
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
Index
HEAD
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
Index
Commit
C
HEAD
Wednesday, June 26, 13

Checkout states
Commit
A
Commit
B
Commit
C
HEAD
Wednesday, June 26, 13

The concept of a ref
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
bc65d74
f96bb37
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
bc65d74
f96bb37 HEAD
Wednesday, June 26, 13

HEAD
What is a ref?
Wednesday, June 26, 13

my-branch
What is a ref?
Wednesday, June 26, 13

origin/my-branch
What is a ref?
Wednesday, June 26, 13

What is a ref?
$ git reset HEAD^
Wednesday, June 26, 13

What is a ref?
42ae0e0
8e0c855
bc65d74
f96bb37 HEAD
(reset)
Wednesday, June 26, 13

Interacting with a
Remote
Wednesday, June 26, 13

Interacting with a
Cloning
Remote
Wednesday, June 26, 13

Interacting with a
Local Checkout
Cloning
Remote
Wednesday, June 26, 13

Interacting with a
$ git clone git://HOST/repo.git
Wednesday, June 26, 13

Interacting with a
$ git clone ./dir/repo.git
Wednesday, June 26, 13

Interacting with a
$ git clone user@host:dir/repo.git
Wednesday, June 26, 13

Interacting with a
Pulling
Local Checkout Remote
Wednesday, June 26, 13

Interacting with a
$ git pull origin master
Wednesday, June 26, 13

git-fetch
git-merge
Wednesday, June 26, 13

master is local!
origin/master is also local!
Wednesday, June 26, 13

Interacting with a
$ git pull --rebase origin master
Wednesday, June 26, 13

git-fetch
git-rebase
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
“base”
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
f96bb37
Wednesday, June 26, 13

Checkout states
42ae0e0
8e0c855
bc65d74
f96bb37
new “base”
Wednesday, June 26, 13

Interacting with a
$ git push origin master
Wednesday, June 26, 13

Decentralization is great, but it is still good to create a
structure of authority.
Workﬂow
Wednesday, June 26, 13

git-ﬂow
$ git flow feature start more-dots
Wednesday, June 26, 13

F
E
D
A
B
C
develop
feature/more-dots
Wednesday, June 26, 13

git-ﬂow
$ git flow release start 2.0
Wednesday, June 26, 13

F
E
D
A
develop
release/2.0
B
C
Wednesday, June 26, 13

git-ﬂow
$ git flow hotfix start 2.0.1
Wednesday, June 26, 13

F
E
D
A
develop
hotﬁx/2.0.1
B
CF
E
D
A
master
Wednesday, June 26, 13

git-ﬂow
$ git flow support start 3.0
Wednesday, June 26, 13

Immutable branches
Wednesday, June 26, 13

Rewriting history
Wednesday, June 26, 13

Is history ever lost?
Wednesday, June 26, 13

Example: git commit --
amend
Wednesday, June 26, 13

Git amend
42ae0e0
8e0c855
bc65d74
f96bb37
Wednesday, June 26, 13

Git amend
42ae0e0
8e0c855
bc65d74
f96bb37 fd0g830
Wednesday, June 26, 13

Git amend
42ae0e0
8e0c855
bc65d74
f96bb37 fd0g830
shows up in ref-
log
Wednesday, June 26, 13

Git amend
42ae0e0
8e0c855
bc65d74
f96bb37 fd0g830
shows up in ref-
log
new HEAD
Wednesday, June 26, 13

When is this okay?
Hasn’t been pushed upstream
Pushed upstream but nobody has pulled*
Wednesday, June 26, 13

Summary
Git history is very readable
Constructing commits is ﬂexible
Organizing commits is ﬂexible
Virtually nothing is lost
Wednesday, June 26, 13

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Why we love git (CPOSC 2012)

1. Why We Love Git Jason May Wednesday, June 26, 13

2. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

3. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

4. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

5. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

6. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

7. Why We Love Git We can expressively track content among multiple endpoints. Wednesday, June 26, 13

8. Commits are a form of documentation. Wednesday, June 26, 13

9. Checkout states “HEAD” Wednesday, June 26, 13

10. Checkout states Commit A Commit B HEAD Wednesday, June 26, 13

11. Checkout states “HEAD” The working tree Wednesday, June 26, 13

12. Checkout states $ touch README.txt Wednesday, June 26, 13

13. Checkout states $ touch README.txt $ git status --short ?? README.txt Wednesday, June 26, 13

14. Checkout states Commit A Commit B HEAD Working tree Wednesday, June 26, 13

15. Checkout states Working tree HEAD Wednesday, June 26, 13

16. Checkout states Working tree HEAD ? ? ? Wednesday, June 26, 13

17. Checkout states $ git add README.txt Wednesday, June 26, 13

18. Checkout states $ git add README.txt $ git status --short A README.txt Wednesday, June 26, 13

19. Checkout states The Index! Wednesday, June 26, 13

20. Checkout states Commit A Commit B HEAD Working tree Wednesday, June 26, 13

21. Checkout states Commit A Commit B HEAD Wednesday, June 26, 13

22. Checkout states Commit A Commit B HEAD Wednesday, June 26, 13

23. Checkout states Commit A Commit B HEAD Index Wednesday, June 26, 13

24. Checkout states Working tree HEAD ? ? ? Wednesday, June 26, 13

25. Checkout states Working tree HEADIndex Wednesday, June 26, 13

26. Checkout states Working tree HEADIndex ? ? ? Wednesday, June 26, 13

27. Checkout states $ git commit -m ‘Add README.txt’ Wednesday, June 26, 13

28. Checkout states $ git commit Wednesday, June 26, 13

29. Checkout states Commit A Commit B HEAD Index README.txt Wednesday, June 26, 13

30. Checkout states Commit A Commit B Index *commit* HEAD Wednesday, June 26, 13

31. Checkout states Commit A Commit B Index HEAD Wednesday, June 26, 13

32. Checkout states Commit A Commit B Index Commit C HEAD Wednesday, June 26, 13

33. Checkout states Commit A Commit B Index Commit C HEAD Wednesday, June 26, 13

34. Checkout states Commit A Commit B Commit C HEAD Wednesday, June 26, 13

35. The concept of a ref Wednesday, June 26, 13

36. Checkout states Commit A Commit B Commit C HEAD Wednesday, June 26, 13

37. Checkout states 42ae0e0 8e0c855 bc65d74 f96bb37 Wednesday, June 26, 13

38. Checkout states 42ae0e0 8e0c855 bc65d74 f96bb37 HEAD Wednesday, June 26, 13

39. HEAD What is a ref? Wednesday, June 26, 13

40. my-branch What is a ref? Wednesday, June 26, 13

41. origin/my-branch What is a ref? Wednesday, June 26, 13

42. What is a ref? $ git reset HEAD^ Wednesday, June 26, 13

43. What is a ref? 42ae0e0 8e0c855 bc65d74 f96bb37 HEAD (reset) Wednesday, June 26, 13

44. What is a ref? 42ae0e0 8e0c855 bc65d74 f96bb37 HEAD (reset) Wednesday, June 26, 13

45. Remotes Wednesday, June 26, 13

46. Interacting with a Remote Wednesday, June 26, 13

47. Interacting with a Remote Wednesday, June 26, 13

48. Interacting with a Cloning Remote Wednesday, June 26, 13

49. Interacting with a Local Checkout Cloning Remote Wednesday, June 26, 13

50. Interacting with a $ git clone git://HOST/repo.git Wednesday, June 26, 13

51. Interacting with a $ git clone ./dir/repo.git Wednesday, June 26, 13

52. Interacting with a $ git clone user@host:dir/repo.git Wednesday, June 26, 13

53. Interacting with a Pulling Local Checkout Remote Wednesday, June 26, 13

54. Interacting with a Pulling Local Checkout Remote Wednesday, June 26, 13

55. Interacting with a $ git pull origin master Wednesday, June 26, 13

56. git-fetch Wednesday, June 26, 13

57. git-fetch git-merge Wednesday, June 26, 13

58. master is local! origin/master is also local! Wednesday, June 26, 13

59. Interacting with a $ git pull --rebase origin master Wednesday, June 26, 13

60. git-fetch git-rebase Wednesday, June 26, 13

61. Checkout states 42ae0e0 8e0c855 Wednesday, June 26, 13

62. Checkout states 42ae0e0 8e0c855 “base” Wednesday, June 26, 13

63. Checkout states 42ae0e0 8e0c855 Wednesday, June 26, 13

64. Checkout states 42ae0e0 8e0c855 f96bb37 Wednesday, June 26, 13

65. Checkout states 42ae0e0 8e0c855 f96bb37 Wednesday, June 26, 13

66. Checkout states 42ae0e0 8e0c855 bc65d74 f96bb37 Wednesday, June 26, 13

67. Checkout states 42ae0e0 8e0c855 bc65d74 f96bb37 new “base” Wednesday, June 26, 13

68. Checkout states 42ae0e0 8e0c855 bc65d74 f96bb37 Wednesday, June 26, 13

69. Interacting with a $ git push origin master Wednesday, June 26, 13

70. Decentralization is great, but it is still good to create a structure of authority. Workﬂow Wednesday, June 26, 13

71. Workﬂow gitolite Wednesday, June 26, 13

72. Workﬂow Wednesday, June 26, 13

73. git-ﬂow Wednesday, June 26, 13

74. git-ﬂow features Wednesday, June 26, 13

75. git-ﬂow $ git flow feature start more-dots Wednesday, June 26, 13

76. F E D A B C develop feature/more-dots Wednesday, June 26, 13

77. git-ﬂow releases Wednesday, June 26, 13

78. git-ﬂow $ git flow release start 2.0 Wednesday, June 26, 13

79. F E D A develop release/2.0 B C Wednesday, June 26, 13

80. git-ﬂow hotﬁxes Wednesday, June 26, 13

81. git-ﬂow $ git flow hotfix start 2.0.1 Wednesday, June 26, 13

82. F E D A develop hotﬁx/2.0.1 B CF E D A master Wednesday, June 26, 13

83. git-ﬂow support Wednesday, June 26, 13

84. git-ﬂow $ git flow support start 3.0 Wednesday, June 26, 13

85. git’s philosophy Wednesday, June 26, 13

86. Immutable branches Wednesday, June 26, 13

87. Rewriting history Wednesday, June 26, 13

88. Is history ever lost? Wednesday, June 26, 13

89. The ref log Wednesday, June 26, 13

90. Example: git commit -- amend Wednesday, June 26, 13

91. Git amend 42ae0e0 8e0c855 bc65d74 f96bb37 Wednesday, June 26, 13

92. Git amend 42ae0e0 8e0c855 bc65d74 f96bb37 fd0g830 Wednesday, June 26, 13

93. Git amend 42ae0e0 8e0c855 bc65d74 f96bb37 fd0g830 shows up in ref- log Wednesday, June 26, 13

94. Git amend 42ae0e0 8e0c855 bc65d74 f96bb37 fd0g830 shows up in ref- log new HEAD Wednesday, June 26, 13

95. When is this okay? Hasn’t been pushed upstream Pushed upstream but nobody has pulled* Wednesday, June 26, 13

96. Summary Git history is very readable Constructing commits is ﬂexible Organizing commits is ﬂexible Virtually nothing is lost Wednesday, June 26, 13

Why we love git (CPOSC 2012)

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Why we love git (CPOSC 2012)